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CONTENTSINTRODUCTION 3

ELECTRICAL SPECIFICATIONS 4

TECHNICAL FEATURES 6

BUSHINGS 7

STANDARD PRODUCT 8

ACCESSORIES 10

TESTING 11

PAINTING 12

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INTRODUCTIONUnited Transformers Electric Company (Utec) located in 2nd Industrial City, Riyadh – KSA. Established in 2001 with the aim to produce Distribution transformers to meet the needs of public utilities in particular and private industrial sector in general, as well as export markets.

Utec is a joint venture between Al- Fozan Group and Wilson Transformer Company (WTC), Australia. WTC is one of the largest transformer producer in Australia established in 1933.

Utec products range:

Distribution transformers, Oil filled (Hermetically Sealed & Conservator type) as per IEC 60076 standard from 25kVA to 3150kVA up to 36KV (HV) & 1,100V (LV).

With state of the art technology, expertise, competency, production equipments & facilities, Utec has executed various contracts for Local / Export Markets.

Since 2001, Utec has supplied thousands of Distribution Transformers in Local / Export Markets to various Utilities and private sectors.

Our objective is to achieve customer satisfaction through timely compliance with customer demands & requirements. We strive constantly to exceed our customer expectations for quality, value, delivery and service.

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ELECTRICAL SPECIFICATIONSSTANDARDSIEC 60076 and IEC 60354SEC Specification No: 51 - SDMS, 56-SDMS, 51-TMSS (including latest revisions)

CONSTRUCTIONCorrugated or rigid tank, hermetically sealed with or without gas cushion.Immersed in mineral oil (IEC60296 - Class I)Natural cooling: ONAN (KNAN can be provided on request)

WINDINGBoth HV and LV windings are made of copper (Aluminum on special request)High Voltage winding: Delta connected.Low Voltage winding: Star connected with neutral brought out.Connection Group: Dyn11 Other configurations like YNd11, Yzn11 etc can be provided.

TEMPERATURE RISE LIMITSMaximum ambient temperature: 550C (standard 500C).Temperature rise of top oil: 40 - 60 0C (as per customer request) standard 450CAvg. Temperature rise of windings: 45 - 650C (as per customer request) standard 500C

ELECTRICAL CHARACTERISTICSFrequency: 50 or 60 HzHigh Voltage: Most used values: 13.8 kV or 33 kV Also available: dual-primary voltage 13.8 – 11 kV, 11 – 6.6 kV. Any voltage can be provided as per customer request. (Up to 36 kV class)

Low Voltage (at no load): Most used values: 231 or 400 V We may supply any voltage required by our client.

Tapping on HV side (by off-load tap changer): ±2.5% ±5% (we may also supply any tapping required by client). Short Circuit withstand time = 2 seconds. (5 sec shot on customer request)Impedance voltage: As per IEC 60076 - 5 or as per customer request.

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State of the art design tools and Engineering capabilities enable Utec to fulfill most stringent requirements .

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TECHNICAL FEATURESSTANDARDSTransformers are manufactured according to IEC 60076in general and in particular as per concerned Utility / ClientSpecifications.

CONSTRUCTIONTank construction can be of any type mentioned below. Hermetically Sealed without gas cushion Sealed with gas cushion Conservator type with breather Cooling with corrugated fin Cooling with radiator

MAGNETIC CIRCUITThe magnetic circuit (Fig.1) is made of a high quality cold rolled, grain oriented silicon steel strips. Each strip is insulated from both sides by Carlite and is cut with an angle 450. Step lap and conventional mitered joint stacking is employed to reduce the no-load losses and the exciting current.

WINDINGSBoth the Low Voltage and High Voltage windings (Fig.2) are madeof copper. (Aluminum winding can also be provided upon specialrequest). The high Voltage winding is wound directly on the Low Voltage winding, with insulating paper and cooling duct, betweenthe two windings. Most modern techniques are used to provide adequate short circuit strength.

TAP CHANGERTappings are provided on the HV windings (number and step according to client requirements) with standard values of ±2.5% & ±5%. The step change from one tapping to another is done by operating an offload tap changer. Padlock for tap changer handle can be provided.

VOLTAGE SELECTORFor dual primary voltages (e.g. 13.8 - 11, 11- 6.6 KV), the switching from one primary voltage to the other is done by a voltage selector.

OIL TYPETransformers are supplied filled with mineral oil according to IEC 60296 - Class I. In addition Silicon or Midel oil can be provided on request.

Fig.1

Fig.2

Fig.3

Magnetic Circuit

Windings

Tap changer / voltage selector handle ( lockable )

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BUSHINGS High voltage bushings : DIN type, made of porcelain (Fig. 1, 2, 3) Plug-in type (Fig. 4) BS type (Fig. 5, 6) Low voltage bushings :DIN type, made of porcelain (Fig. 7, 8)Epoxy Bus bar type (Fig. 9)Mono block (Fig. 10)

Fig1 Fig3 Fig4Fig22Fig2F

Fig10Fig9

Fig6 Fig7Fig5Fig88ggFig8

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Fig.2

Fig.1

Fig.4

Fig.6

Fig.3

Fig.5

ACCESSORIESSTANDARD ACCESSORIESName plate & connection diagram (Fig.1)Earthing terminals on tank bottom (Fig.2)Oil filling plugOil drain valve (Fig.3)Lifting lugs (Fig.4)Bi-directional rollers (Fig.5)Top oil thermometer with a maximum Indicator (Fig.6) (with or without contacts)Pressure relief device (Fig.7)(with or without contacts)Oil level indicator:Vertical float type (Fig.8)Dial type (Fig.9)

OPTIONALBuchholz relaySilica gel BreatherWinding temperature indicator with contactsDGPT2 multi-function protection relay(Fig.10) that detects and signals:(a)Reduction of oil level(b)Presence of gas(c)Over temperature

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Fig.7

Fig.8

Fig.10

Earthing terminal

Lifting lug

Top oil thermometer

Oil level indicator:vertical float type

Oil level indicator:dial type

Pressure relief device

DGPT2 multi-functionprotection relay

Rating Plate

Adjustable roller

Oil darin Valve

Fig.9

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TESTINGOn each manufactured transformer the following routine tests will be conducted, in accordance to IEC 60076 prior to final inspection and dispatch to customer.

ROUTINE TESTING:-

Measurement of the turns ratio and phase displacement.

Measurement of Insulation resistance.

Measurement of winding resistance.

Separate source voltage withstand test.

Induced over voltage withstand test.

Measurement of no load loss and magnetizing current.

Measurement of short circuit impedance and Load loss.

Dielectric strength test of Insulating oil.

Following type tests and special tests can be performed, as per the design/customer request, according to the related IEC standards.

Type Tests:-

Temperature Rise Test. (Internal).

Lightning Impulse Test (King Saud University – KSA or International Lab.)

Utec transformers have been subjected to special test performed by KEMA-Netherland and King Saud University-KSA.

Special Tests:-

Sound Level Test. (Internal + External)

Short Circuit Withstand Test. (International Laboratories)

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Transformers are coated with heavy duty specialized alkyd system having proven track record under gulf atmospheric services. Our standard painting system is applied through flooding process to ensure uniform application including hard to reach area.Also Epoxy poly urethane system can be applied as primer coat of Epoxy zinc phosphate and top coat of aliphatic polyurethane Enamel by air spray gun to cover the need of highly corrosive areas in accordance of BS EN ISO 12944.

Painting system

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GROUND M O U N T E D T R A N S F O R M E R

DESCRIPTION LIST

1- HV BUSHING2- LV BUSHING3- 5 - POSITION OFF - CIRCUIT TAP SELECTOR4- PRISMATIC OIL LEVEL INDICATOR5- DIAL TYPE OIL THERMOMETER WITH 2 CONTACTS6- PRESSURE RELIEF DEVICE WITH 2 CONTACTS7- DRAIN VALVE WITH SEALING PLUG8- RATING & DIAGRAM PLATE9- UNIT LIFTING LUGS10- EARTH LUG WITH M12 BOLT11- SKID UNDER BASE12- RADIATORS13- LOGO PLATE14- HV CABLE BOX15- LV CABLE BOX16- JACKING PADS17- THERMOMETER POCKET18- FILTER VALVE WITH SEALING PLUG

22- LV bus bar support23- Conservator tank24- Prismatic oil level indicator25- Double flanged ball valve26- Silica gel breather 27- Conservator oil drain valve28- Conservator filler stack with r1” plug29- Buch holz relay

DESCRIPTION LIST

1- HV Plug-in bushing2- LV bushing3- 5 – position off – circuit tap selector4- Dial type oil thermometer5- Pressure relief device with sealing6- Drain valve with sealing plug7- Rating & diagram plate8- Unit lifting lugs9- Earth lug with m12 bolt10- Base channel11- Side cooling, flexible fins12- End cooling, flexible fins13- Logo plate14- LV phase markers15- HV phase markers16- Trunking HV & LV removable17- LV cable box18- HV cable box19- LV cable support20- HV cable support21- LV extension bus bar

GROUND MOUNTED TRANSFORMERRIGID TANK WITH RADIATOR 500 kVA to 3150 kVA RATED VOLTAGE ≤ 36 KV

With conservator & breather 100 kVA to 3150 kVA. Rated Voltage ≤36 KV

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DESCRIPTION LIST

1- HV BUSHING2- LV BUSHING3- 5 - POSITION OFF - CIRCUIT TAP SELECTOR4- FILLER STACK WITH LEVEL INDICATOR5- DIAL TYPE OIL TEMPERATURE THERMOMETER6- PRESSURE RELIEF DEVICE7- DRAIN VALVE WITH SEALING PLUG8- LV CABLE BOX9- RATING & DIAGRAM PLATE10- LV CABLE SUPPORT11- UNIT LIFTING LUGS12- EARTH LUG WITH M10 BOLT (STAINLESS STEEL)13- LV PHASE MARKERS (HV MARKERS ON LID)14- ANGLE FEET WITH 2 SLOTS 17 x 12015- END COOLING, FLEXIBLE FINS16- ARRESTER BRACKET17- LOGO PLATE

DESCRIPTION LIST

1- HV BUSHING2- LV BUSHING3- 5 - POSITION OFF - CIRCUIT TAPSELECTOR4- FILLER STACK WITH OIL LEVEL INDICATOR5- DIAL TYPE OIL THERMOMETER6- PRESSURE RELIEF DEVICE7- DRAIN VALVE8- RATING & DIAGRAM PLATE9- UNIT LIFTING LUGS10- EARTH LUG WITH M12 BOLT11- BASE CHANNEL WITH TWO SLOTS 17 x 4012- SIDE COOLING, FLEXIBLE FINS13- LOGO PLATE14- END COOLING, FLEXIBLE FINS15- FLANGE LV BUSHING16- FLANGE HV BUSHING17- LV & HV PHASE MARKERS

TRANSFORMER FOR PACKAGE SUBSTATIONALL ACCESSORIES ON FRONT SIDE100 kVA to 1500 kVA. RATED VOLTAGE ≤ 13.8 K V

P O L E M O U N T E D T R A N S F O R M E RWITH LV CABLE BOX, HV BUSHING TOP MOUNTED100 kVA to 300 kVA. RATED VOLTAGE ≤ 36 KV

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POLE MOUNTED TRANSFORMER

GROUND MOUNTED TRANSFORMER

GROUND MOUNTED TRANSFORMER

GROUND MOUNTED TRANSFORMER

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