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MAIN CHARACTERISTICS AND TECHNICAL DATA

740 ENGEA-

Sofia Bulgaria

2008

ON-LOAD TAP-CHANGERSOF HHI-B

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Contents

Main characteristics and technical data. General .................................................................................4

1. Application and operating principle

1.1 Electrical diagrams and operating sequence .....................................................................5 1.2 On-load tap-changer basic units and transformer tank building-in method .....................7 1.3 Basic regulation schemes .................................................................................................8

2. Technical characteristics of the on-load tap-changers ...............................................................9

3. Insulation system of the on-load tap-changers

3.1 Design characteristics .....................................................................................................10 3.2 Insulation system requirements ......................................................................................10

4. Current-carrying system of the on-load tap-changers

4.1 Design characteristics and general requirements ............................................................11 4.2 Temperature rise of contacts ...........................................................................................12 4.3 Short-circuit current test .................................................................................................12 4.4 Use of parallel current carrying paths .............................................................................13 4.5 OLTC overloading ..........................................................................................................13

5. Switching system of the on-load tap-changers

5.1 Admissible switching duties ...........................................................................................13 5.2 Special switching duty ....................................................................................................14 5.2.1 Switching with contact sets, connected in parallel .........................................................14 5.2.2 Switching at winding with coarse tap .............................................................................15 5.3 Switching problems at changing-over of tapped or coarse winding ...............................16 5.4 Transition resistors .........................................................................................................17

6. Mechanical system of the on-load tap-changes

6.1 Basic mechanisms in the tap-changer .............................................................................18 6.2 Motor-drive units and accessories ..................................................................................18

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7. Operating conditions and protection of on-load tap-changers

7.1 The most important about the operation .........................................................................20 7.2 Protective devices ..........................................................................................................21

8. Mounting of the on-load tap-changers and motor-drive units to the transformer

8.1 Basic mounting diagrams ...............................................................................................21 8.2 Connection of the on-load tap-changer to the motor-drive unit .....................................22

9. Type and routine tests of the on-load tap-changers

9.1 Type tests ........................................................................................................................23 9.2 Routine tests ...................................................................................................................23 9.3 Quality control ................................................................................................................23

10. Selecting the on-load tap-changer ............................................................................................24

11. Appendix ....................................................................................................................................26

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GENERAL

Operating principle of the manufactured by Hyundai Heavy Industries-Bulgaria on-load tap-changers (OLTC’s), technical parameters and data, that refer to all them and application methods are given in this general specification. The specific data for each type of OLTC’s are represent in the particular type specifications.

Transformer manufacturer could select the necessary OLTC from the general specification and the particular type specifications.

For proper OLTC selection, the transformer manufacturer should fill up an order specification, which should be confirmed by Hyundai Heavy Industries-Bulgaria (HHI-B). After transformer manufacturer has already done the order according to agreed specification, he is responsible for the correct OLTC selection. HHI-B keeps their rights to make changes in the general and particular type specifications for the manufactured by HHI-B OLTC.

The data in the general specification are referred to OLTC types: RS5, RS6, RS7, RS9, RS12, RS16 and RS18, which operate by the classical resistor type of tap-changer diagram of switching and for RS21, RS22, RSV5, RSV9 and, RSV20 which are provided with vacuum diverter switches.

Note:Drawings, diagrams and technical data in this brochure are subject to changes without prior notice.

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The operating sequence of the OLTC con-tact elements from Fig. 1 can be represented by cyclogram or circle diagram as shown on Fig. 3.

The circle diagrams are used when the cycle of one tap-change operation is counted within one revolution. To follow up the operation of the change-over selector on Fig. 3a a tap change operation from 10-th to 11-th position is represented. The corresponding angles are: α1– N1 starts moving; α2 – N1 opens; α3 – N1 closes; α4 – N1 stops moving; α5 – diverter switching start; αc – operating angle of divert-er switch (represented enlarged); αp – angle of operation of the change-over selector.

When reversing (Fig. 3b), only switching of diverter switch (αc) is carried out. This is accomplished by a connector with death zone of action for angle α0 in the kinematic chain between diverter switch and tap selector.

The HHIB motor-drive unit (MDU) makes 33 revolutions of the driving shaft for a tap-change operation from one tap to adjacent one. In this case the opening and closing of the contact elements, read as rotation number n, can be represented by the cyclogram on Fig. 3c. The cyclogram is taken for every manufactured OLTC and the results are recorded in the routine test certificate.

The HHIB diverter switches are high-speed resistor type with arc-quenching in transformer oil. They oper-ate according to the ”flag” cycle diagram. Operating sequence of the contact elements represented by switch-ing cyclogram and phasor diagram is shown on Fig. 4.

Fig. 3a – operating sequence shown by circle diagramFig. 3b – circle diagram at reversingFig. 3c – linear showing of operation by cyclogram

-

+

K1'

N1

K1

N2

Fig. 3c

n

C

α 4

α 3

α1

α 5

+ Ν1

Fig. 3aα

α

α 2

− Ν1 α 5α

α

- p

+p

P

Fig. 4Operating sequence of resistor type diverter switch

Fig. 3b

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Switching duration for different types of diverter switches is within the range of 28÷45 ms. Switching oscillograms in both directions are given in routine test certificates. The phasor diagram is represented for given power factor (cos φ) and reflects the cases of tap-change operation at raising and lowering, where Uc – step voltage, Ip – through current; Ic – circulating current.

HHIB produces also OLTCs with diverter switches using vacuum interrupters (VIs). The basic scheme is with three VIs, one resistor R and a switching unit S (Fig. 5).

Main VIs (V1 and V2) interrupt the through current and transition VI (V3) interrupts the circulating current which is limited by the resistor R to be smaller than the through current. Thereby the electrical wear resistance of the diverter switch is increased. Diagrams with special design of S and such with two VIs are applied. They are represented in the technical materials of on-load tap-changers for which they are related to.

1.2. On-load tap-changer basic units and transformer tank building-in method

The HHIB OLTCs are designed for trans-former tank installation (Fig. 6). The OLTC is immersed in the transformer tank (10) oil (11), close to transformer active part (16) so that the leads between tap winding and tap se-lector are as short as possible.

R2UI c

c =

Fig. 5Basic scheme of diverter switch with VIs

Fig. 6 OLTC built in the transformer tank

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The basic units of the OLTC are: diverter switch oil vessel 1, diverter switch 3, tap selector 5, change-over selector 6 and MDU 7. The MDU is side mounted to the tank 10 wall. The MDU motion is trans-ferred by means of cardan coupler 8, vertical shaft 9, bevel gear 12 and horizontal shaft 13 to the worm gear 14 on the tap-changer carrying flange. Further the motion is transferred to the vertical insulation shaft 2 and the mechanism 4, which coordinates the operation of the diverter switch, tap selector and change-over selector.

The diverter switch has three main components: transition resistors 3.1, contact system 3.2 and spring energy accumulator 3.3.

The diverter switch oil vessel 1 is protected by oil-flow protective relay 15, connected by a pipeline 17 with the conservator. For draining the contaminated oil out of the diverter switch oil vessel a suction pipe (siphon) is used (not shown).

The MDU consists of electric motor 7.1, reduction gear 7.2 with hand drive 7.3, electrical control 7.4 and electrical panel 7.5. All these elements are located in the protective cubicle 7.6.

As a high voltage electrical apparatus the tap-changer has five specific systems:• Insulation system - ensures the insulation to earth and between the elements with different

potential; • Current-carrying system – contact systems of tap selector, change-over selector • Switching contact system – diverter switch contacts;• Mechanical system – MDU, transmission elements and some special mechanisms;• System for protection and maintenance.

1.3. Basic regulation schemes

The basic regulation diagrams and tap winding connections are shown on Fig. 7. Details for modifica-tions of these connection schemes are given in the particular OLTC type catalogue.

a – linear regulationb – reverse regulation at the neu-

tral point c – regulation at delta connected

windings with coarse tapsd – regulation at delta connected

windings with asymmetrical tapping windings with two-phase and a single-phase tap-changers.

e and f – specific schemes for au-totransformers regulation.

g – regulation with booster trans-former.

Fig. 7Basic regulation diagrams

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2. Technical characteristics of on-load tap-changers

The OLTCs have the following basic technical characteristics:• Highest voltage for equipment – the highest phase-to-phase or phase-to-earth voltage r.m.s. for which

the OLTCs insulation is designed. The required by the standard test values of impulse and separate source AC voltages to earth and where applicable between phases (poles) are determined based on these voltages. The HHIB OLTCs have the following highest voltages: (41.5; 72.5; 123; 145; 170; 245 and 300) kV. On request special design can be provided.

• Rated frequency – power frequency for which the OLTC is designed. The standard design is for 50 Hz and 60 Hz.

• Rated through current – the r.m.s. value of the current, which the OLTC is able to carry continuously and divert without failure and is in accordance with stan-dard requirements. The HHIB OLTCs have the following rated through cur-rents: 200; 400; 630 (700); 1000; 1200 (1250) A for three-phase (poles) design and additionally: 1600 A and 2000 A – in a single-phase (pole) design. The rated through current is related with: maximum rated through-current (more often 20% higher) and short-circuit withstand current (r.m.s. and peak val-ues).

• Number of phases (further – phase(s) will mean pole(s)) – the HHIB OLTCs have single-phase, two-phase and three-phase execution.

• Rated level of internal insulation – it is determined by the values of with-stand impulse voltages and separate source AC voltages between two ad-jacent taps, across the tapping range and across a part of tapping range. The following sizes of tap selector and change-over selector in ascending withstand voltage values are offered: K, L, M, N, P.

• Number of operating positions – the largest number of operating positions for which the OLTC is designed. Most often they are up to 35, but at special design they can be increased up to 107. The relation between number of operating positions and change-over selector type is given in the basic connection dia-gram.

Fig. 8 OLTC type Designation

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The OLTC type designation reflects the above technical characteristics. As an example this is shown on Fig. 8 for OLTC type RS9.3.

Other important characteristics of the OLTC are rated step voltage and maximum rated step voltage. These voltages are related with the values of the relevant rated through currents and are considered fur-ther in relation with the OLTC switching system.

3. Insulation system of the on-load tap-changers

3.1. Design characteristics

HHIB OLTCs have the following design features:OLTCs from the series RS9, RSV9, RS6, RS7 (single and three phase execution) and RS18 and RSV20

(three phase execution) are with separate oil vessel for the diverter switch. The tap selector and change-over selector are located below the oil vessel in the pure oil (transformer tank oil) – Fig. 6.

The diverter switch is mounted to the contact elements on the bottom of oil vessel or on oil vessel in-sulation cylinder. Thus the oil and insulation material of oil vessel secure the diverter switch insulation to the earth. The OLTC driving shaft is also in pure oil. These design features provide higher reliability of insulation system.

The OLTCs from series RS5 have the same design but the diverter switch is with three isolated phases. The diverter switch is unified with those of RS9 but has three sets of contacts separated by radial gaps providing oil insulation of diverter switch phases.

The OLTC RS21 (single phase execution) and RS22 (three phase execution) operating in SF6 gas en-vironment have the same design principles.

The OLTCs RS12 and RS16 are with three phase diverter switches. The diverter switch phases are vertically placed in column one under another and can be star connected or separated. The tap selector contacts are placed around the diverter switch column. The change-over selector of all those types is in pure oil.

3.2. Requirements to the insulation system

The main insulation of OLTCs (insulation to earth and between insulation phases) withstands the be-low test voltages:

Highest voltage for equipment, kV r.m.s. 41.5 72.5 123 145 170 245 (300)Separate source AC withstand voltage, kV r.m.s. 110 140 230 275 325 460Impulse withstand voltage ( 1.2/50 μs ), kV peak 250 350 550 650 750 1050Switching impulse withstand voltage ( 250/2500 μs), kV peak - - - - - 850

On request other values can be negotiated.

All declared withstand voltages are proven by type tests according to item 5.2.6 of IEC 60214-1;2003.

The exact values of withstand voltages are given in the catalogues for each particular type OLTC (Fig. 9).The withstand step voltages in the diverter switch with VI are comparatively lower than those of the

corresponding oil diverter switch. Special design measures have to be introduced when higher withstand voltages are required such as: selection of proper switching diagram, disconnectors connected in series, non-linear resistors etc.

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a0 – insulation distance between parts of two adjacent taps (step)b1 – insulation distance between parts, connected with the ends of the tapped winding (tapping range)b2 – insulation distance between parts of two adjacent tap selector phases d – insulation distance between parts, connected with coarse tap endsc1 – insulation distance between the beginning of coarse winding tap and neutral (outgoing terminal

for delta connected windings)c2 – insulation distance between parts, connected with coarse tap beginnings of two different phases

For OLTCs with highest voltages for equipment Um=121 kV and above, with regulation other than at neutral point a partial discharge test is carried out. This is done according to item 5.2.6.9 of IEC 60214-1;2003.

4. Current carrying system of the on-load tap-changers

4.1. Design characteristics and general requirements

The tap-changer current carrying system consists of current carrying elements connected in series, fixed and movable contacts of change-over selector, tap selector and diverter switch (Fig. 1). All cur-rent carrying path elements are designed for maximum rated through current and the guaranteed by the manufacturer short-circuit currents. Special attention is paid to the movable contact connections. The contact elements are made of copper or electrotechnical brass (with increased content of copper). In the HHIB tap-changers all contact elements are coated with silver composition with increased mechanical endurance regardless of the rated current.

WITHOUT CHANGE-OVER

SELECTOR

WITH REVERSE CHANGE-OVER

SELECTOR

WITH COARSE CHANGE-OVER

SELECTOR

Fig. 9Main insulation distances

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During manufacturing the following characteristics of the tap-changers are measured carefully and filled in a routine test certificate:

• Contact pressure of the movable contact systems. It shall be within the limits, prescribed by HHIB.

• Ohmic resistance of separate units and of the whole tap-changer current carrying path. The limits, prescribed by HHIB should not be exceeded.

Current carrying path type tests of tap-changers are carried out according to IEC 60214–1:2003. They are:

• Temperature rise of contacts.• Short-circuit current test.

4.2. Temperature rise of contacts

The temperature rise test is carried out at current equal to 1.2 times the maximum rated current. The established contacts temperature rise in respect to ambient temperature has to be reached in accordance to the criteria described in the standard. The temperature rise of each contact of current carrying path for oil immersed tap-changers should not exceed 20ºC. For the manufactured in HHIB tap-changers the temperature rise most often is not more than 15ºC.

For tap-changers operating in SF6 gas such as RS 21 and RS 22 the temperature rise do not exceed 35ºC regardless that for the silver coated contacts the admissible temperature rise is 65ºC.

4.3. Short-circuit current test

According to IEC 60214-1:2003, item.5.2.3 the short circuit current test value is determined from the curve of Fig. 10 as a multiple of the maximum rated through current.

The short circuit current is applied three times with duration of 2 seconds. The initial peak of the test current shall have a value, equal to 2.5 times (±5%) the r.m.s. value of the rated test short-circuit cur-rent.

The HHIB tap-changers withstand higher short-circuit currents than the standard requires. For some of the types this reserve is double. The specified short-circuit values are given in the separate types techni-cal specifications.

At request for short-circuit current different from the specified, additional test can be carried out and if necessary design modifications can be utilized.

Fig.10Short circuit test value

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4.4. Use of parallel current carrying paths

In single-phase tap-changers for higher rated through-currents, the design of tap selector and change-over selector provides two parallel contact sets. This is effective when the transformer tapped winding is doubled, i.e. exact division of the common current in the two parallel branches is guaranteed (enforced current split). In this case the HHIB OLTCs RS9.3-I-1600 A and RS6-I-2000 A have to be utilized. In RS9.3-I-1600 A only the tap selector and the change-over selector have two parallel branches while in RS6-I-2000 A not only the tap selector and the change-over selector, but also the diverter switch has two parallel branches. Diverter switches for high currents have three phases (poles) connected in parallel. The contact systems carrying the current continuously are silver coated.

If transformer tapped winding is not doubled, the current carrying path of the tap selector and change-over selector is reinforced (RS9.3-I-1200 A).

In some transformers three single-phase tap-changers are mounted. It is recommended to drive them with one motor-drive mechanism only. An adjustment is done in such a way, that the three diverter switches operate within 300 ms in the process of switching.

In case of apprehension of short time high circulating currents, the transformer manufacturer should consult HHIB.

4.5. OLTC ov erloading

According IEC 60214-1;2003 the tap-changers must be able to operate continuously overloaded with 20 % above their maximum rated through current. The OLTC should not restrict the overloading ability of the transformer according to IEC 60354, IEC 60542 and ANSI C57.91. The HHIB OLTCs meet the overload requirements, because the temperature rise of all current carrying path contacts is below 20ºC when tested with current, equal to 1.2 times the maximum rated one. Moreover, the temperature rise of the transition resistor is below 350ºC during the test with current 1.5 times the maximum rated one for a half of complete cycle of operation, performed uninterrupted with its driving mechanism.

5. Switching system of the on-load tap-changers

5.1. Admissible switching duties

As it was shown on Fig. 4 the diverter switch main contacts set, operating by “flag” diagram, break the transformer load current Ip. The arc is extinguished after current passing through the zero and the volt-age between the opened contact elements starts recovering to a value, determined by the voltage drop, caused by the current across the transition resistor (Ip.R). The transition contacts break the circulating current (more often defined by the equation Ic=Uc/2R) added or subtracted with the half of the through-current, depending on the regulation (tapping) direction. Therefore the tripping current values and recov-ering voltages of the main and transition contacts depend on the selected values of the transition (current limiting) resistors. These values are chosen in a way to achieve:

• The guaranteed breaking capacity for each type of tap-changer.• The guaranteed electrical life of the diverter switch contacts for each type of tap-changer.

The breaking capacity of a particular type of diverter switch is presented as a diagram Uc=f(Ip), shown on Fig. 11.

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The rated through-current of the tap-changer is I2 with a guaran-teed relevant step voltage value U2. The tap-changer can be used in transformers with lower than I2 through-currents at which the step voltage can be higher than U2. Maximum step voltage U1 is deter-mined at guaranteed through-current I1. The breaking capacity is proved by test with double rated through-current (2I1, respectively 2I2) and relevant step voltages U2, respectively U1 according to item 5.2.2 of IEC 60214-1;2003.

The electrical wear of the diverter switch contacts is considered in a similar way. Most often the transition resistor value (R) is determined so that the electrical wear of the main and transition contact elements to be approximately equal. In this way certain number of switching operations at rated through-current is guaran-teed (Fig.12). Lower electrical wear is ensured at lower through-currents.

The minimum required number of switching operations at rat-ed through-current is determined in compliance with IEC 60241-1;2003, item 5.2.2.1 “Service duty test”. These are 50 000 switch-ing operations at test with rated step voltage or the same switching operations with exactly defined extra switching operations, if the test is carried out with reduced step voltage. The electrical life at rated through-current of HHIB OLTCs is proved at considerably larger number of switching operations – from 200 000 to 500 000 depending on the rated through-current and diverter switch type.

The HHIB OLTCs are tightness tested according to the require-ments of IEC 60214-1;2003, item 5.2.5.4. This test is combined with service duty test (electrical wear ability) according to item 5.2.2.1.

In some cases the higher values of step voltage could be achieved by special transition resistor dimension-ing, but on the account of some decrease of the electrical life of the contacts.

All contentions made so far are valid for diverter switches with VI as well (Fig. 5). In a special design of the switching contact unit S, the main VI break the through-current at 25 % of the switching operations and at the remained 25 % - the difference between the through-current and circulating current (for example RSV 5).

5.2. Special switching duty

In some transformers the tap-changers can be subjected to more special switching duties. There are such cases at single-phase tap-changers for high currents and utilized one or more coarse taps.

5.2.1. Switching with contact sets, connected in parallel

In single-phase diverter switches with rated through-current up to 700 A one phase of a three-phase diverter switch is used only. For single-phase tap-changer for higher rated through-currents a three-phase

Fig. 11

Diverter switch breaking capacity

Switching operations at rated-throughcurrent

Fig. 12

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diverter switch with two or three phases (poles), con-nected in parallel is applied (Fig. 13).

In case of a transformer taping winding split in two branches (pos. a), the two phases of a tap selector and two phases of diverter switch are used. Such a vari-ant is applied for RS9.3-I-800/1200 A. Similar ap-proach is implemented in RS6-I-2000 A, where two three-phase diverter switches of RS9 type are located one under another with insulation between them. The three phases are connected in parallel for each divert-er switch (pos. b). Three phases, connected in parallel are used in RS9.3-I-1200 A and RS9.3-I-1600 A with the purpose to increase the electrical life of the divert-er switch contacts. Despite of the preliminary adjust-ment providing opening time of the three main contact sets within 1÷2 ms, the switching ability is defined by one main contact set only. The properly dimensioned transition resistors ensure the current division and arc existing on the three connected in parallel transition contact sets. The switching ability and electrical life of the diverter switch contacts are proved in compli-ance with the requirements of IEC 60214-1; 2003.

5.2.2. Switching at a winding with coarse tap

The recovery voltage of opened main contact set grows according to sinusoid with rated frequency af-ter current passing through zero value. This improves considerably the arc quenching conditions, for exam-ple in comparison with diverter switches using reac-tors. The same refers to the transition contact sets dur-ing a switching between the adjacent taps (Fig. 14a).In this case the leakage inductance of one step is in-significant by value in comparison with the transition resistors value.

The more complicated case is during the switch-ing operation from tap K to tap I (Fig. 14b). The fine tapped winding and the coarse tap are connected in series to the transition resistors and the inductance (x1+x2) commensurate with the resistors value (2R). The current is shifted towards the voltage, and the recovery voltage becomes considerably steep. Arc quenching conditions become worse and the guaran-teed switching ability for tap-changer with reversing change-over selector is decreased especially if the val-

Fig. 13Parallel connections of contact sets at two

and three phase diverter switches

b

Switching at winding with coarse tap

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ues of x1 and x2 are too big. HHIB has the experience and necessary data for different inductance (x1+x2)and 2R at which secure switching operation is guaranteed. The client has to fill-in the values of x1 and x2in the Order Specification Sheet when regulation diagram is with coarse tap. If required, additional tests can be carried out in HHIB test laboratory.

When the values of inductances x1 and x2 are too big, it is recommended a 3G diagram to be used in-stead of 1G diagram.

5.3. Switching problems at changing-over of a tapped or coarse winding

During the switching of the reverse change-over selector movable contact (Fig. 15a) the tapped wind-ing remains with free potential for a short time (galvanically isolated from main winding). As a result potential difference appears between the fixed contact elements connected to the tapped winding and the movable contact element connected to the main winding, determined by the capacitance Cw between the main and tapped windings and the capacitance Ce between the tapped winding and transformer.

This potential difference is called recovery voltage Uw. When the change-over selector contacts open the capacitive current Is caused by above capacitances is interrupted. The recovery voltage and capaci-tive current may cause electrical discharges. At high values of Is the switching over is attended by typical discharge noise.

HHIB has an instruction for calculation of Uw and Is in all cases of application. The admissible values of Uw and Is for HHIB tap-changers are shown on Fig. 15b. In case the calculations show the higher values it is necessary tie-in resistors (connected according to Fig. 15c) to be used. The role of tie-in resis-tors is to limit the potential of tapped winding during the switching operation. The tie-in resistors values are calculated using the formulas, given in the instruction. The values of Cw and Ce have to be stated in the Order Specification Sheet.

Usually the tie-in resistors used in HHIB tap-changers are mounted in the following ways:• Under the tap selector (Fig. 16a), which is applied most often for RS 9 and RS 6. • Laterally (Fig. 16b), which is applied for example for RS 12.

On request other ways for mounting of tie-in resistors can be utilized as well.

Regulation with reverse winding

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5.4. Transition resistors

The transition resistors of HHIB tap-changers are usually executed in two variants:From punched special steel sheets formed as a band with transverse slots. The band is winded together

with a band from insulation material as a spiral. So formed cylindrical packages are mounted vertically, to ensure good vertical oil flow around the metal band. The resistor packages are unified for step voltages up to 1600V and through-currents up to 630 A: up to100 A – 8 Ω; from 100 A to 200 A – 4 Ω; from 200 A to 400 A – 2 Ω and from 400 A to 630 A – 1.3 Ω. For special cases other values are used too.

From resistant wire (constantan). The wire is winded spirally, additionally insulated with packthread and rolled with insulation band as packages, similar to these from item Fig. 16a above. This variants is usably for over 1600V and throng currents over 630 A.

6

5

8

7

1

2

3

4

a)1 – OLTC carrying flange2 – diverter switch oil vessel3 – tap selector4 – Tie-in resistors

b)5 – OLTC carrying flange6 – Insulating cylinder7 - change-over selector8 – Tie-in resistors

Fig. 16Disposition of tie-in resistors

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The resistor packages are located in the diverter switch according to the respective design: over the contact set in RS 9, RS 5 and others, around the contact set – RS 6, over and under the contact set – RS 12 and RS 16.

The transition resistors of all HHIB tap-changers are tested in compliance with IEC 60214-1;2003, item 5.2.4 at uninterrupted number of subsequent operations, equal to a half of operating cycle with its driving mechanism at a normal speed and current 1.5 times the maximum rated through-current at the relevant rated step voltage. The temperature rise of all HHIB OLTCs has considerable reserve compared with the admissible 350ºC.

The resistors quality is proved also during the breaking capacity tests.

6. Mechanical system of the on-load tap-changers

The mechanical system of the tap-changers consists of (Fig. 6):• Mechanisms in the tap-changer.• Mechanisms in the motor-drive unit.• Mechanisms in the transmission.

6.1. Basic mechanisms in the tap-changer

The mechanisms are of extreme importance for the reliable operation of OLTC. The basic mechanisms are:

• Contact system mechanism.• Spring-energy accumulator.• Mechanism for transformation from rotary to the reciprocating motion for charging the spring-

energy accumulator. • Mechanisms with intermittent action like Geneva gear type.• Connector with death zone providing the connection between the diverter switch and the tap selec-

tor.• Mechanism for change-over selector operation.

Details for the designs of these mechanisms are given in the instructions for mounting and operation of the respective tap-changers.

6.2. Motor-drive units (MDUs) and accessories

Three basic types of MDUs manufactured in HHIB are:a) MDU MZ 4.1 with overall and assembly dimensions are shown on drawing MZ4.1/07.3.b) MDU MZ 4.4 which is in protective cubicle with larger dimensions, front tap position indicator

according to ANSI requirements and protective panels at door opened. Overall and assembly dimensions are shown on drawing MZ4.4/07.

c) MDU MZ 8 with overall and assembly dimensions according to drawing MZ 8/07. It is used for driving light types tap-changers (for example RS 18, RS 20) and off-circuit tap-changers (OffCTC) with motor-drive mechanism.

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The basic technical characteristics of these types of MDUs are given in the table below:

MDU type MZ4.1 / MZ4.4 MZ8Rated power of el. motor kW 0.75/1.1 0.37Rated frequency Hz 50/60 50Supply voltage V 3AC 400/230 3AC 400/230Synchronous speed min-1 1500 1500Handle revolutions per one tap-change operation rev. 33 33Torque of outgoing shaft N.m 17/24 8Tapping duration s 4.5 5Maximum number of operating positions 35 27Voltage of the control circuit V AC 230 AC 230Insulation level kV 2 2Heating power W 250 250Degree of protection IP54 IP54Weight kg 80/104 60

The MDUs can have also special design according to the client requirements.For example:

• Degree of protection IP 65• Revolutions of driving shaft per one tap-change operation: 0.5; 1; 6; 16.5; 66.• Number of operating positions – up to 107

The MDUs manufactured in HHIB comply with all requirements of IEC 60214-1;2003, sub-clause 6.

HHIB MDUs have the following features:• Possibility for automatic control of the MDU with AVR (automatic voltage regulator).• Parallel operation of two or more MDUs. • Signal for remote tap position indicator in BCD or binary code, current output of 4-20 mA and

others.• Possibility for connection of monitoring system for observation and control of the tap-changers.• Different voltages of the control circuit.

The basic electrical scheme for control of the MDU is shown on drawing №CV5.AP1C.00 sheet 1-3. At request special schemes can be utilized for particular orders. The MDU components are shown on the drawings bellow.

• Bevel gear – drawings №157 and №202• Cardan coupler with or without protective rubber casing – drawings №442.3 and №442.3.1 respec-

tively. • Remote tap position indicators – drawing №349.2• Push buttons for remote control

The drawing №236.3 of worm gear with tap position indicator and end mechanical blocking device is represented here because of its wide application in the HHIB tap-changers.

EA-740/08 ENG

20

The MDUs assembled with tap-changers and transmission elements have mechanical endurance mini-mum 500 000 tap changing operations according to the requirements of IEC 60214-1;2003, sub-clause 5.2.5.1. The mechanical endurance is proved for 1 000 000 tap-changing operations.

7. Operating conditions and protection of on-load tap-changers

7.1. The most important about the operation

Most of the tap-changers manufactured in HHIB operate built-in the transformer tank in transformer oil environment. According to IEC 60214-1;2003 the operating temperature range is from –25ºC up to +100ºC. The upper limit is based on a rated load and maximum ambient temperature of +40ºC. At trans-former emergency overload, the oil temperature can achieve 115ºC (IEC 60354).

A hole for mounting of a thermal sensor is provided in the tap changer head, which can block the MDU operation at temperature below –25ºC. In case the thermal sensor is required it has to be explicitly speci-fied by the client.

HHIB has to be consulted in case special insulation oils or different temperature ranges have to be ap-plied.

Some special tap-changers, such as RS 21 and RS 22 operate in SF6 gas insulation environment. For such applications the specific technical requirements have to be clarified with transformer manufac-turer.

The MDUs and transmission elements most often are mounted in open air and are exposed to direct atmospheric influences. The MDUs standard design is for temperature range –25ºC to +40ºC.

The MDUs for specific operating conditions are offered as well:• Humid tropical climate with increased temperature up to +50ºC;• Arctic climate – temperature down to –60ºC.

The protective cubicles of HHIB MDUs ensure internal microclimate so that reliable operation is guar-anteed in all climate conditions.

The HHIB MDUs are offered with degree of protection IP54 in accordance with IEC 60259. The spe-cial design is offered as well for degree of protection IP65.

The diverter switches of all HHIB tap-changers can be easily dismantled and taken out from OLTC oil vessel for revision and eventual repair by means of hoist (drawing №206), which is always part of delivery.

For the diverter switches of OLTCs types RS 12 and RS 16 which are with bigger height, the hoist is with different design, shown in particular catalogues.

The diverter switches of tap-changers (except types RS 12 and RS 16) are fastened to the contact ele-ments, mounted in the oil vessel by means of bolts screwed and unscrewed with special wrench (drawing №205), which is always part of delivery.

This mounting way ensures insulation advantages. The insulation driving shaft is located laterally in pure oil (Fig. 6) and the kinematic chain is not interrupted at opening the diverter switch oil vessel cover. Thus during the revision, without taking out the diverter switch the following can be inspected:

• The operation cyclogram of the tap-changer, using three metal rods and a diagram similar to the one from drawing №RS9-10

• The operation sequence of diverter switch set of contacts by means of portable oscilloscope and exemplary diagram from drawing №RS9-09

The diverter switch oil vessels of the tap-changers usually have up four pipe outlets with flanges, lo-

21

cated on the tap-changer carrying flange:• R – for connection to the protective oil flow relay.• S – for oil suction pipe with the purpose of periodical changing of the contaminated oil with pure

one. It is recommended the outlet to be connected with cock pipe with valve at the level of the transformer foundation for safe oil draining.

• Q – for second outlet if an oil filter is used.As per standard execution the three outlets are located at intervals of 90ºC. At request their placement

on the carrying flange can be changed in two couples on the left and on the right side.The standard execution of the worm gear (pos. 14 from Fig. 6) is with outgoing shaft, located tangen-

tially. At request mounting at intervals of 90ºC can be performed in HHIB. Eventual mounting deviations of the bevel gears and the shafts (pos. 12 and 13 on Fig. 6) is compen-

sated by the cardan couplers, which admit maximum deviation of 25ºC.

7.2. Protective de vices

The following protective devices proven in operation are used in the HHIB tap-changers:• Protective oil flow relay. Most often used type is URF25/10-1 – Germany (drawing №203.1) but

other types can be utilized as well. • Protective membrane, which is used together with the protective relay. At eventual failure in the oil

vessel accompanied with sudden increase of the pressure, the protective relay gives the impulse for tripping to the circuit breaker, which protects the transformer. The circuit breaker has its own time for tripping (about 60÷80ms). For this period of time the pressure may increases to values dangerous for the diverter switch oil vessel. In such case membrane tears off releasing the pressure. For drain-ing hot gas and oil to a safe place it is recommended a pipeline to be mounted over the membrane.

• According to drawing №174Q pressure relief device can be used instead of the protective mem-brane

• Other pressure relays also can be used on client request.

8. Mounting of the on-load tap-changers and motor-drive units to the transformer

8.1. Basic mounting diagrams

All HHIB OLTCs are built-in the transformer tank. They are fixed to the transformer cover through their carrying flange.

Assembly into a separate oil or SF6 gas vessels is performed occasionally. The lighter types of tap-changers can be assembled to transformer tank cover without dismantling of

main components. The heavier types are usually assembled after separation of the oil vessel with diverter switch and tap

selector with change-over selector. The oil vessel with diverter switch is mounted to the transformer tank cover after that the tap selector with the change-over selector are assembled.

For transformers with bell type tank a special design of the carrying flange is utilized as shown on drawing №RS9.3-07.3.

Other HHIB types OLTCs have similar design of the carrying flange for assembly to the bell type transformer tanks. More details are given in the respective instructions for mounting and operation.

EA-740/08 ENG

22

The transmission connection between the tap-changer(s) and the MDU can be usually executed for one, two or three tap-changers assembled in the transformer tank. The configuration and designations of the transmission (driving shafts arrangement) diagrams are shown on drawing №209.3. The drawing refers to №RS 9.3, but the diagrams for other types tap-changers are the same.

8.2. Connection of the on-load tap-changer to the motor-drive unit

The tap-changer and MDU have to be assembled at one and the same operating tap position (Fig. 17).During the factory tests the proper assembly is checked by operating the MDU from one to the other end of the regulation range. After the tests the disassembled tap-changer and MDU are provided with mechanical locks on their shafts in order to avoid wrong assembly to the transformer at site.

The compliance between the positions of the tap selector and change-over selector set of contacts and the MDU positions can be seen from the table enclosed to the drawing.

Position 19 18 17 16 15 14 13 12 11 1 09 8 7 6 5 4 3 2 1Tap selector contact 9 8 7 6 5 4 3 2 1 K 9 8 7 6 5 4 3 2 1Currently working change over selector contact

- - - - - - - - --

-+

++ + + + + + + + +

Switching direction LowerRaise

Handle direction Counter-ClockwiseClockwise

Moving contact direc-tion

ClockwiseCounter-Clockwise

Motor drive unit con-trol

From contactor K1 in MDUFrom contactor K2 in MDU

Fig. 17Designation of the operating positions and the contacts in the tap selector

23

According to HHIB practice, after carrying out the routine tests in the factory, the tap-changer and the MDU are led to mid position and disassembled. The outgoing shaft A of the MDU and incoming shaft B of the tap-changer are mechanically locked by special iron plate. Then they are packed and dispatched to the client with the locks. The locking plates have to be removed after assembly of tap-changer and MDU to the transformer and before coupling of the transmission elements.

Usually the vertical and horizontal shafts are delivered longer. The useless extra length is cut out to the actually needed dimensions.

9. Type and routine tests of the on-load tap-changers

9.1. Type t ests

The type tests on a set of OLTC – MDU of all types are carried out in compliance with the requirements of IEC 60214-1;2003.

The type tests as well as research and development tests are carried out in the HHIB specialized labo-ratories.

A big part of the switching tests (item 5.2.2 of IEC 60214-1;2003) and short-circuit current test (item 5.2.3) have been carried out in the internationally recognized laboratories such as “KEMA” – the Neth-erlands (at 50 and 60 Hz), “ZKU” – Czech Republic and “KERI” – Republic of Korea.

9.2. Routine t ests

The following routine tests are carried out in HHIB factory for each manufactured set of tap-changer and MDU. The complete check on components compliance and conformity with the technical documen-tation is performed as well.

1. Measurement of the contact pressure of all movable contacts for compliance with the design docu-mentation.

2. Measurement of the current-carrying path ohmic resistances for compliance with the factory norms.

3. Test of operating sequence of the contact sets (sequence of operation).4. Oscillograms of diverter switch operation in both directions.5. Mechanical test on the set OLTC-MDU by performing 500÷2000 tap-change operations within the

whole cycle of operation range.6. Oil tightness test on diverter switch oil vessel at overpressure from inside to outside and from out-

side to inside.7. Test of the tap-changer insulation to earth, on a tapping range and between two adjacent contacts

(step).8. Test of the MDU insulation by 2 kV for 1 minute.

The results from the routine tests are written in routine test certificate, which is dispatched to the client together with the set.

9.3. Quality c ontrol

The quality control system in accordance with ISO9001:1994 was implemented since 1998 and con-

EA-740/08 ENG

24

trolled by TUF Rheinland, TUV-CERT. In a certification audit in compliance with ISO9001:2000 was held and the company was certified.

The utilized working procedures and documents required by the quality assurance system and their strict observation guarantee no compromise with HHIB policy regarding OLTCs quality.

10. Selecting the on-load tap-changer

The proper selection of an OLTC is determined by the optimum technical and economical parameters obtained in order to meet the requirements of transformer tests and transformer reliable operation.

Usually the transformer designer has to select the needed type of OLTC with respective individual technical parameters.

For this purpose the Order Specification Sheets provided by HHIB have to be filled in and confirmed by HHIB along with Order Acknowledgment.

The following examples illustrate the proper selection of OLTC in some particular type of transform-ers:

Example 1

An OLTC for a transformer 20/25MVA with delta connected high voltage winding and regulation range 66±8x1.25% kV have to be selected.

All necessary information about transformer, OLTC and MDU is presented in the filled in the Order Specification Sheet (Example 1).

The selected OLTC is result of consideration on the following technical parameters: OLTC type, num-ber of phases, max. rated through current, highest voltage for equipment Um , tap selector size and basic connection diagram.

From the technical specification for the series RS 12 OLTC RS12-Δ-200-72.5.10.19.3W is chosen.Using given values of the capacitances Cw and Ce the recovery voltage and capacitance current can

be calculated:

From the Fig. 15c could be estimated that tie-in resistors should be used. Their values are calculated in accordance with the HHIB instructions and it is specified that two tie-in resistors of 120 kΩ have to be used for each phase.

The fitting will be done in conformity with client requirements, according to the Fig. 16b.Motor drive unit MZ4 is with supply voltage AC 400/230V and there is a connection to electronic volt-

age regulator 4÷20 mA.

25

Example 2

An OLTC shall be selected for three-phase transformer 50.4 MVA with regulation in high voltage star connected winding 161±15 % kV (±13 taps) with coarse change-over selector at neutral point. The filled in Order Specification Sheet is shown as (Example 2). The data is verified by HHIB and the selection of OLTC R9.3-III-400-170/L-14.27.1G is confirmed. The calculation of tie-in resistors shows:

As it is shown on Fig. 15 for the selected OLTC there is no need to use tie-in resistors.

The switching of the winding with coarse change-over selector (according to 5.2.2) is more special. The fine tapped winding and the coarse tap are connected in series and the inductance value is X1+X2=4.5Ω The leakage inductance 14.3 mH is relatively high and it may cause longer arcing time of the auxiliary contacts during the process of switching. According to HHIB experience and accumulated data from dif-ferent tests it is necessary increased value of the current limiting resistors 2 pcs x 6 Ω to be selected.

On request pressure relief valve Qialitrol is mounted on the OLTC head. It’s installed at the place of protective membrane (7.2).

The motor drive unit is equipped with terminals for OLTC digital remote position indicator – BCD-code. There are also terminals for 4÷20 mA signal to the automatic voltage regulator (AVR).

Example 3

An OLTC for single-phase transformer with capacity of 166.7 MVA and a voltage of 345/√3±8x1.25 % kV has to be selected.

From the filled in Order Specification Sheet (Example 3) an OLTC R9.3-I-1200-245/P-10.19.3W is selected. With given values for Cw and Ce the recovery voltage and inductance current are calculated:

In accordance with the Fig. 15, for the cases when Uw is lower then 35 kV there is no need of using the tie-in resistors. The motor drive unit MZ 4.1 is selected according to a special electrical diagram for 60 Hz with motor supply 3AC and operating voltage 110 AC.

Terminals for 4÷20 mA signal are provided for automatic voltage regulator. The MDU is equipped with terminals for OLTC digital remote position indicator - BCD-code with voltage DC 220 V on the diode matrix.

EA-740/08 ENG

26

11. Appendix

1 Motor-drive unit MZ-4.1 – mounting and dimensions №MZ-4.1 / 07.3

2 Motor-drive unit MZ-4.4 – overall and fixing dimensions №MZ-4.4 / 07

3 Motor-drive unit MZ-8 – mounting and dimensions №MZ-8 / 07

4 Motor-drive unit MZ-4.1 – electrical diagram №CV5.AP1C.00 sh.1

5 Motor-drive unit MZ-4.1 – electrical diagram №CV5.AP1C.00 sh.2

6 Motor-drive unit MZ-4.1 – electrical diagram №CV5.AP1C.00 sh.3

7 Bevel gear №157

8 Bevel gear №202

9 Cardan coupler №442.3

10 Cardan coupler №442.3.1

11 Remote tap position indicator – µSI 02 №349.2

12 Push buttons for remote control №436

13 Worm gear with a tap position indicator №236.3

14 Hoist №206.1

15 Special wrench S14 №205

16 Sequence of operation diagram taking №RS9 – 10

17 Diagram for diverter switch oscillograph recording №RS9 – 09

18 Protective relay №203.2

19 Pressure relief device №174.Q

20 Mounting of OLTC RS 9.3 in the bell type transformer tank №RS9.3 – 07.3

21 RS 9.3 – driving shafts arrangement №209.3 sh.1

22 RS 9.3 – driving shafts arrangement №209.3 sh.2

23 Order Specification Sheets Example 1 ÷ 3

MOUNTING AND DIMENSIONSMOTOR-DRIVE MECHANISM MZ-4.1

2008

N° MZ-4.1/07.3

856

83

360

40

B

106

164

140

134

75

85

140

Ø100Ø56

112Lx

Lx=A-300 mm /RS-12,RS-16/

Lx=A-315 mm /RS-5,RS-9/

=1° - acceptable vertical deviation

WEIGHT - 86 kg.O-O is OLTC - AXIS

VARIANT II

268

350

4xØ21

350

A

Lx

75

95.5

L

Ø63.5

100

510Ø25

Ø25

B

VARIANT I

Ø55

70

137

340 107

200

570

164

B

260

560(660)

50

OPTIONAL

430 OPENED BY 90°

800 OPENED BY 180°

145

535

O

O

M10 Ø568

4

2

4

3

665

C

C

7595

.5

15

122

43

120 110 120

50

32.5

148

10

50 50

47.5

4xØ36 3xØ22

335

548

EARTINGSCREW M12

A

A

8

288

520 (620)

520

LB

2

158

B

L =B-515 mm ; L = ;B BBL

cos max = 25°

MOUNTING AND DIMENSIONSMOTOR-DRIVE MECHANISM MZ-4.1

2008

N° MZ-4.1/07.3

856

83

360

40

B

106

164

140

134

75

85

140

Ø100Ø56

112Lx

Lx=A-300 mm /RS-12,RS-16/

Lx=A-315 mm /RS-5,RS-9/

=1° - acceptable vertical deviation

WEIGHT - 86 kg.O-O is OLTC - AXIS

VARIANT II

268

350

4xØ21

350

A

Lx

75

95.5

L

Ø63.5

100

510Ø25

Ø25

B

VARIANT I

Ø55

70

137

340 107

200

570

164

B

260

560(660)

50

OPTIONAL

430 OPENED BY 90°

800 OPENED BY 180°

145

535

O

O

M10 Ø568

4

2

4

3

665

C

C

7595

.5

15

122

43

120 110 120

50

32.5

148

10

50 50

47.5

4xØ36 3xØ22

335

548

EARTINGSCREW M12

A

A

8

288

520 (620)

520

LB

2

158

B

L =B-515 mm ; L = ;B B BL

cos max = 25°

140226

L

A

B28

8

B

50

2

348 OPENED BY 90°

602

905 OPENED BY 180°

10

VARIANT II

610570

520(620)

560 (660)

140

4xØ21

320

50

272

35062

5

70

350

920

HHIB

BL400

Ø56

112

Ø100

140

140164

Ø2595

.5 75

C

8

C

2

4

Lx

85

8

5

M10

O

O

95.5

75

Lx

VARIANT I

158

Ø56

Ø63.5

66

3

4

~100

75 134

Ø55

=1° - acceptable vertical deviation

Lx=A-315 mm /RS-5,RS-9/

Lx=A-300 mm /RS-12,RS-16/

O-O is OLTC - AXIS

WEIGHT -104 kg.

B

B

D

120

170

370

145

400

D

EARTING

SCREW M12

1

MOUNTING AND DIMENSIONSMOTOR-DRIVE MECHANISM MZ-4.4

2008

N° MZ-4.4/07

139 9 2 400

1110

76

2

=133 45

HHIB

3

81

9

12 17 18

1614 15

2120

2423

2226

2725

19

L =B-525 mm ; L = ;B B BL

cos max = 25°L =B-445 mm ; L = ;B B

BL cos max= 25°

L =B-445 mm ; L = ;B B BL

cos max= 25°

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Out

let 2

20VA

C/10

A

S13

HQ

1S"

L-R"

QFE

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QEM PC

Auxi

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IGN

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W

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ition

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____

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(max

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118

6

F

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Out

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S13

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Auxi

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3

step indicator unitMounting dimentions for

83

INPUT 26 x 6INPUT 27 stepsPOWER SUPPLY 220V AC

220V AC

STEP INDICATOR TYPE SI-02

67

67

W

µ

72

72

ELECTRUM

SI-02µ

72

68

68

72

67

SI-02µ

step indicator unitMounting dimentions for

83

INPUT 26 x 6INPUT 27 stepsPOWER SUPPLY 220V AC

220V AC

STEP INDICATOR TYPE SI-02

67

67

W

µ

72

72

ELECTRUM

SI-02µ

72

68

68

72

67

SI-02µ

64

78 100

128

4xM4

150

RAISE

HYUNDAI HEAVY INDUSTRIES CO.

BULGARIA

STOP LOWER AUTOM.MANUAL

23

24

X1

X2

1

X1 13

14 X2

4 2 3

140

3

4

6 5 8 7

X1

X2

140

14087

14064

FOR REMOTE CONTROL PUSH BUTTONS

2008

N° 436

87

5. WORM WHEEL

2. GASKET

4. SHAFT WITH A SLЕЕVE3. BOX

1. BASE

9 10

6. LOCKING SECTOR7. UPPER SUPPORT8. COVER9. TAP POSITION WINDOW

10. COVER11. GENEVA WHEEL WITH POSITION INDICATOR12. WORM13. LOCKING ROD

11 12 13

1

2

3

4

5

6

7

8

3

"Normal Position"

Marks for

TAP POSITION INDICATORWORM GEAR BOX WITH A

2008

N° 236.3

211

95.5

Ø105

Ø56

0.5

16

4

10

64

78 100

128

4xM4

150

RAISE

HYUNDAI HEAVY INDUSTRIES CO.

BULGARIA

STOP LOWER AUTOM.MANUAL

23

24

X1

X2

1

X1 13

14 X2

4 2 3

140

3

4

6 5 8 7

X1

X2

140

14087

14064

FOR REMOTE CONTROL PUSH BUTTONS

2008

N° 436

87

5. WORM WHEEL

2. GASKET

4. SHAFT WITH A SLЕЕVE3. BOX

1. BASE

9 10

6. LOCKING SECTOR7. UPPER SUPPORT8. COVER9. TAP POSITION WINDOW

10. COVER11. GENEVA WHEEL WITH POSITION INDICATOR12. WORM13. LOCKING ROD

11 12 13

1

2

3

4

5

6

7

8

3

"Normal Position"

Marks for

TAP POSITION INDICATORWORM GEAR BOX WITH A

2008

N° 236.3

211

95.5

Ø105

Ø56

0.5

16

4

10

975

240 40

52

111

2xØ25

15046.5

122

166

2008

N° 206.1

975

240 40

52

111

2xØ25

15046.5

122

166

2008

N° 206.1

345

359

280

294

158

130

4xØ14

4xØ14

294

280

280

~Ø50

125

A A

A-A1

5-20:

5

4

33 29

6

8

7

7

8

10

max 2

FORK VERSIONMOUNTING OF OLTC RS9.3

2008

N° RS9.3-07.3

345

359

280

294

158

130

4xØ14

4xØ14

294

280

280

~Ø50

125

A A

A-A1

5-20:

5

4

33 29

6

8

7

7

8

10

max 2

FORK VERSIONMOUNTING OF OLTC RS9.3

2008

N° RS9.3-07.3

Filled in by HHI Co

Bulgaria

“HHI Co.Bulgaria” Serial № Customer: Example 1

Factory order № Customer order N:

Man-sheet pos. № Delivery date:

Tran

sfor

mer

dat

a

Rated power: 20/25 MVA Overload – according to IEC 60354/91

Constant Decreasing from position №

Tap winding connection

Change – over selector

coarse reversing

without

Related voltage 66 kV Rated frequency 50 Hz

Tapping range 8x1.25 in 17 taps

Operation : Generator Network Furnace Electrolysis Value of leakage impedance (Only in case of coarse tap winding!)

- coarse tap winding x = j ohms- fine tap winding x = j ohms

Value of the capacitance

- between main and tap winding CW = 4050 pF

- between tap winding and transformer tank Ce = 1116 pF Mounting of the OLTC to transformer

Mounting on the active part / fork / Other kind of mounting / on the transformer cover /

Ope

rati

ng

and

test

vol

tage

s Operating and test voltages Max operating voltage kV Test voltage , kV Impulse 1.2/50 s Power frequency

Transformer line terminal 350 140

OLTC to earth 350 140

Voltage stress in kV during H.V. transformer tests Between tap in device and preselected tap ao 120 30 Across fine tap winding b1 180 50 Between ends of the tap windings of different phases b2 350 140 Across coarse and fine tap winding c1 - Between beginning in the coarse tap winding of different phases c2 - Between the beginning and the end of the coarse tap winding d1 180 50

On

-loa

d ta

p-ch

ange

r da

ta

Step voltage in the phase Ust = 825 V In case of variable Ust :

Ust max = V Ust min = V

Max through tapping current Imax = 140 A Phase designation

A, B, C Other

X, Y, Z …………………………

U, V, W …………………………

Drain pipe arrangement view from the preselector side Left Right

Climatic execution Moderate Arctic Tropical

Location of driving shafts drw. N 209 ; 209.3 ; or 300 arrangement P2

variant I

Designation of operating positions

Max number of one way effective turns

corresponds to positionN: 1

Designation of mid

positions N: 9a,9,9b

“RAISE” means control of OLTC

towards position N: 1 Dimension of OLTC:

h = 1596 mm drw № 240

Legends

(language) English

Documentation : language x

files English x3

Protective relay - contacts - N.O. N.C. C.O. x

Pressure relief device yes no

Type of OLTC ( see standard designation in corresponding catalogue)

Example RS9 III 400 110/M 10.19.1 G

For chosen type of OLTC RS12 Δ 200 72.5 10.19.3 W Notes: Please fill in the values or mark in the square.

1. The tie-in resistors to be mounted on the level of phases.

HYUNDAI HEAVY INDUSTRIES Co. Bulgaria Order specifications for

OLTC Customer sign. / Date

№ OD 01-00-04

Filled in by “HHI Co-Bulg

“HHI Co.Bulgaria” serial № Customer: Example 1

Factory order № Customer order №

Man-sheet pos.№ Delivery date: MOTOR DRIVE MECHANISM DATA

Designation of operating positions Max. number of eff. turns

Position: 1

Mid-positions: 9a, 9, 9b

Automatic passage through

positions(s) 9a, 9b

“RAISE” means control

towards pos.: 1 Motor circuit: Standard: 400V 50Hz 3 AC/N Others: V Hz 3 AC/N 3 AC

Control circuit: Standard: 230 V 50 Hz AC (Ph-N) Other V Hz AC 2 AC DC

Heating circuit: Standard supply voltage (230 V 50 Hz AC) Other V Hz AC 2 AC DC Add. heater with hygrostat Control switch on/off Lighting: Standard movable lamp and door operated switch Hand operated switch Position transmitter for remote position indication and/or parallel control: Resistor contact range(P) step resistors x Resistor contact range(P) step resistors x Contact range(K) break before make, make before break Decadic contact range(D) Contact range - BCD – output(BCD) Climatic execution: Moderate Arctic Tropical Cabinet door drive hinge: Left Right

Legends (language): Documents-language x folds:

Driving shafts

LX= mm a1= mm c= mm Arrangement According Draw.№ LB= mm a2= mm d= mm

Variant According Draw.№

LB= mm b = mm =

Remote position indication: Standard - Digital for resistor contact range Pointer instrument Aux.transformer: Prim.Voltage V; Sec.voltage VDC Digital (for BCD-code) Measuring converter output mA, supply voltage 220 V AC Electronic voltage regulation/parallel control: Isn’t standard delivery Please specify: *Please fill in the values or mark in the square ! Notes: HYUNDAI HEAVY INDUSTRIES Co.

Bulgaria Order specifications for motor-drive mechanism and accessories

Customer sign. / Date

№ ОD 01-00-04

18 6

P2

English

English x3

1 1

1

2200

800

300

I

300

Filled in by HHI Co

Bulgaria

“HHI Co.Bulgaria” Serial № Customer: Example 2

Factory order № Customer order N:

Man-sheet pos. № Delivery date:

Tran

sfor

mer

dat

a

Rated power: 50.4 MVA Overload – according to IEC 60354/91

Constant Decreasing from position №

Tap winding connection

Change – over selector

coarse reversing

without

Related voltage 161 kV Rated frequency 50 Hz

Tapping range 13x1.15 in 27 taps

Operation : Generator Network Furnace Electrolysis Value of leakage impedance (Only in case of coarse tap winding!)

- coarse tap winding x = 2.25 j ohms- fine tap winding x = 2.25 j ohms

Value of the capacitance

- between main and tap winding CW = 2100 pF

- between tap winding and transformer tank Ce = 500 pF Mounting of the OLTC to transformer

Mounting on the active part / fork / Other kind of mounting / on the transformer cover /

Ope

rati

ng

and

test

vol

tage

s Operating and test voltages Max operating voltage kV Test voltage , kV Impulse 1.2/50 s Power frequency

Transformer line terminal 379.5/v3 kV 750 325 OLTC to earth 195.5/v3 kV 750 325

Voltage stress in kV during H.V. transformer tests Between tap in device and preselected tap ao 90 25 Across fine tap winding b1 250 60 Between ends of the tap windings of different phases b2 250 60 Across coarse and fine tap winding c1 300 100 Between beginning in the coarse tap winding of different phases c2 300 100 Between the beginning and the end of the coarse tap winding d1 250 60

On

-loa

d ta

p-ch

ange

r da

ta

Step voltage in the phase Ust = 1073 V In case of variable Ust :

Ust max = V Ust min = V

Max through tapping current Imax = 213 A Phase designation

A, B, C Other

X, Y, Z …………………………

U, V, W …………………………

Drain pipe arrangement view from the preselector side Left Right

Climatic execution Moderate Arctic Tropical

Location of driving shafts drw. N 209 ; 209.3 ; or 209.3 arrangement P1

variant I

Designation of operating positions

Max number of one way effective turns

corresponds to positionN: 1

Designation of mid

positions N: 14

“RAISE” means control of OLTC

towards position N: 1 Dimension of OLTC:

h = 1926 mm drw № 310.3

Legends

(language) English

Documentation : language x

files English x3

Protective relay - contacts - N.O. N.C. C.O. x

Pressure relief device yes no

Type of OLTC ( see standard designation in corresponding catalogue)

Example RS9 III 400 110/M 10.19.1 G

For chosen type of OLTC RS9.3- III - 400 -170/L 14.27.1 G Notes: Please fill in the values or mark in the square.

HYUNDAI HEAVY INDUSTRIES Co. Bulgaria Order specifications for

OLTC Customer sign. / Date

№ OD 01-00-04

Filled in by “HHI Co-Bulg

“HHI Co.Bulgaria” serial № Customer: Example 2

Factory order № Customer order №

Man-sheet pos.№ Delivery date: MOTOR DRIVE MECHANISM DATA

Designation of operating positions Max. number of eff. turns

Position: 1

Mid-positions: 14

Automatic passage through

positions(s)

“RAISE” means control

towards pos.: 1 Motor circuit: Standard: 400V 50Hz 3 AC/N Others: V Hz 3 AC/N 3 AC

Control circuit: Standard: 230 V 50 Hz AC (Ph-N) Other V Hz AC 2 AC DC

Heating circuit: Standard supply voltage (230 V 50 Hz AC) Other V Hz AC 2 AC DC Add. heater with hygrostat Control switch on/off Lighting: Standard movable lamp and door operated switch Hand operated switch Position transmitter for remote position indication and/or parallel control: Resistor contact range(P) step resistors x Resistor contact range(P) step resistors x Contact range(K) break before make, make before break Decadic contact range(D) Contact range - BCD – output(BCD) Climatic execution: Moderate Arctic Tropical Cabinet door drive hinge: Left Right

Legends (language): Documents-language x folds:

Driving shafts

LX= mm a1= mm c= mm Arrangement According Draw.№ LB= mm a2= mm d= mm

Variant According Draw.№

LB= mm b = mm =

Remote position indication: Standard - Digital for resistor contact range Pointer instrument Aux.transformer: Prim.Voltage V; Sec.voltage VDC Digital (for BCD-code) Measuring converter output mA, supply voltage 220 V AC Electronic voltage regulation/parallel control: Isn’t standard delivery Please specify: *Please fill in the values or mark in the square ! Notes: HYUNDAI HEAVY INDUSTRIES Co.

Bulgaria Order specifications for motor-drive mechanism and accessories

Customer sign. / Date

№ ОD 01-00-04

26 6

P1

English

English x3

1

2000

1500

209.3

I

209.3

4...20

Filled in by HHI Co

Bulgaria

“HHI Co.Bulgaria” Serial № Customer: Example 3

Factory order № Customer order N:

Man-sheet pos. № Delivery date: OLTC DATA

Tran

sfor

mer

dat

a

Rated power: 1ph. 166.7 MVA Overload – according to IEC 60354/91

Constant Decreasing from position №

Tap winding connection

Change – over selector

coarse reversing

without

Related voltage 345/v3 kV Rated frequency 60 Hz

Tapping range 8x1.25 in 17 taps

Operation : Generator Network Furnace Electrolysis Value of leakage impedance (Only in case of coarse tap winding!)

- coarse tap winding x = j ohms- fine tap winding x = j ohms

Value of the capacitance

- between main and tap winding CW = 3700 pF

- between tap winding and transformer tank Ce = 1200 pF Mounting of the OLTC to transformer

Mounting on the active part / fork / Other kind of mounting / on the transformer cover /

Ope

rati

ng

and

test

vol

tage

s Operating and test voltages Max operating voltage kV Test voltage , kV Impulse 1.2/50 s Power frequency

Transformer line terminal 379.5/v3 kV 1050 460 OLTC to earth 195.5/v3 kV 1050 460

Voltage stress in kV during H.V. transformer tests Between tap in device and preselected tap ao 150 40 Across fine tap winding b1 490 120 Between ends of the tap windings of different phases b2

Across coarse and fine tap winding c1

Between beginning in the coarse tap winding of different phases c2

Between the beginning and the end of the coarse tap winding d1

On

-loa

d ta

p-ch

ange

r da

ta

Step voltage in the phase Ust = 4312.5/v3 V In case of variable Ust :

Ust max = V Ust min = V

Max through tapping current Imax = 930 A Phase designation

A, B, C Other

X, Y, Z …………………………

U, V, W …………………………

Drain pipe arrangement view from the preselector side Left Right

Climatic execution Moderate Arctic Tropical

Location of driving shafts drw. N 209 ; 209.3 ; or 209.3 arrangement P2

variant II

Designation of operating positions

Max number of one way effective turns

corresponds to positionN: 1

Designation of mid

positions N: 9a,9b,9c

“RAISE” means control of OLTC

towards position N: 1 Dimension of OLTC:

h = 2224 mm drw № 491.3

Legends

(language) English

Documentation : language x

files English x3

Protective relay - contacts - N.O. N.C. C.O. x

Pressure relief device yes no

Type of OLTC ( see standard designation in corresponding catalogue)

Example RS9 III 400 110/M 10.19.1 G

For chosen type of OLTC RS9.3 I 1200 245/P 10.19.3 W Notes: Please fill in the values or mark in the square.

HYUNDAI HEAVY INDUSTRIES Co. Bulgaria Order specifications for

OLTC Customer sign. / Date

№ OD 01-00-04

Filled in by “HHI Co-Bulg

“HHI Co.Bulgaria” serial № Customer: Example 3

Factory order № Customer order №

Man-sheet pos.№ Delivery date: MOTOR DRIVE MECHANISM DATA

Designation of operating positions Max. number of eff. turns

Position: 1

Mid-positions: 9a, 9b, 9c

Automatic passage through

positions(s) 9a, 9c

“RAISE” means control

towards pos.: 1 Motor circuit: Standard: 400V 50Hz 3 AC/N Others: V Hz 3 AC/N 3 AC

Control circuit: Standard: 230 V 50 Hz AC (Ph-N) Other V V Hz AC 2 AC DC

Heating circuit: Standard supply voltage (230 V 50 Hz AC) Other V Hz AC 2 AC DC Add. heater with hygrostat Control switch on/off Lighting: Standard movable lamp and door operated switch Hand operated switch Position transmitter for remote position indication and/or parallel control: Resistor contact range(P) step resistors x Resistor contact range(P) step resistors x Contact range(K) break before make, make before break Decadic contact range(D) Contact range - BCD – output(BCD) Climatic execution: Moderate Arctic Tropical Cabinet door drive hinge: Left Right

Legends (language): Documents-language x folds:

Driving shafts

LX= mm a1= mm c= mm Arrangement According Draw.№ LB= mm a2= mm d= mm

Variant According Draw.№

LB= mm b = mm =

Remote position indication: Standard - Digital for resistor contact range Pointer instrument Aux.transformer: Prim.Voltage V; Sec.voltage VDC Digital (for BCD-code) Measuring converter output mA, supply voltage 220 V AC Electronic voltage regulation/parallel control: Isn’t standard delivery Please specify: *Please fill in the values or mark in the square ! Notes: HYUNDAI HEAVY INDUSTRIES Co.

Bulgaria Order specifications for motor-drive mechanism and accessories

Customer sign. / Date

№ ОD 01-00-04

400 60

110 60

230

18 6

1000 P2

English

English x3

60

Voltage of diode matrix 220 V DC.

18 6

1

1

2000

15

209.3

II

209.3

4...20


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