NPU 2.0 Reference Guide

7/28/2019 NPU 2.0 Reference Guide

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Software version 2.0, July 2008Prague, Czech RepublicCopyright 2008 ComAp s.r.o.Written by Vladimir Sebian and Libor indel

ComAp, spol. s r.o.Kundratka 2359/17, 180 00 Praha 8, Czech RepublicTel: +420 2 246 012 111, Fax: +420 2 66 31 66 47E-mail: [email protected], www.comap.cz

REFERENCE GUIDE

NPU Unit

Mains decoupling relay

Installation and Operation Instructions

Software version 2.0


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NPU, SW Version 2.0, ComAp, July 2008NPU-2.0.PDF 2

1. Contents

1. Contents..................................................................................................................................................22. Technical Specification ...........................................................................................................................3

NPU Technical Specification.......................................................................................................................4NPU Mechanical Design .............................................................................................................................5

3. Installation...............................................................................................................................................6Power Supply ..............................................................................................................................................6Analog Inputs ..............................................................................................................................................6Output Relays..............................................................................................................................................6The NPU Unit Wiring Diagram ....................................................................................................................7

Connection NPU Unit to phase-to-neutral voltage..................................................................................7Connection NPU Unit to phase-to-phase voltage...................................................................................8

4. Function ..................................................................................................................................................9Protection types...........................................................................................................................................9Overvoltage protection............................................................................................................................9

Undervoltage protection..........................................................................................................................9Overfrequency protection........................................................................................................................9Underfrequency protection....................................................................................................................10Voltage asymmetry protection ..............................................................................................................10Vector shift supervision.........................................................................................................................10

Phase sequence supervision ....................................................................................................................11Frequency measurement ..........................................................................................................................11Internal watchdog......................................................................................................................................11Output Relays............................................................................................................................................11Example: Evaluation of under voltage protection, B3=0...........................................................................14Vector Shift Protection...............................................................................................................................15

5. Settings .................................................................................................................................................17Buttons ......................................................................................................................................................17Display and LEDs......................................................................................................................................17Parameters settings ..................................................................................................................................17

6. Displayed Quantities and Parameters ..................................................................................................18Set A:.........................................................................................................................................................18

Default setting .......................................................................................................................................19Set B:.........................................................................................................................................................20

Default setting .......................................................................................................................................217. Order codes ..........................................................................................................................................22


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2. Technical Specification

The NPU unit is designed for 3-phase mains protection. The operator can switch on/off availableprotections or adjust limits and time delays for each protection. The operator can also select one of twofunctions of output relays.Rated voltages are 100, 230, 400, 480 VAC selected by order - see order codes. Measuring voltagefrequency range is from 44 up to 68 Hz.NPU power supply voltage can be in the range 90 250 VAC or 16 110 VDC selected by order - seeorder codes.

NPU offers following protections:

Over frequency protection f>, f>> Under frequency protection f> Under voltage protection U


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NPU Technical Specif ication

Parameter Specification

Dimensions 75 x 100 x 115 mm

Power supply

NPU FUV/YYY/230VAC

NPU FUV/YYY/24VDC

90 250 VAC

16 110 VDC

Power consumption c. 3 W

Insulation 4 kV

Elmg. Interference immunity According to IEC 50082-2

Elmg. Interference According to IEC 55022

Temperature range -20 +70C

Protection IP20

Rated voltage 100, 230, 400, 480 VAC (by the order)

Maximal voltage range Rated + 30 %

Rated frequency 50 / 60 Hz

Maximal frequency range 44 68 Hz

Accuracy of frequency measuring 0,2% from rated value (from 10% of rated voltage value)

Accuracy of voltage measuring 1% from rated value at rated frequency 10% and 25C

1,5% over whole temperature range

Signal relay contacts

- max. switched voltage / current

- max. switched power

- rated voltage / current

- minimum load

- lifetime

250 V / 4 A

resistive load: 1000 VA AC, 200 W DC

inductive load: 500VA AC, 25W DC

resistive load: 250V / 4A AC

200V/0,1A DC, 24V 4A DC

inductive load: 250V / 2A AC

200V/0,1A DC, 24V 3A DC

1W / 1VA at Umin > 10V

1x105 cycles

Overvoltage category Class. III

Time delay accuracy 0.2% +030ms


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NPU Mechanical DesignThe NPU is packaged in a plastic box for assembly on a mounting plate TS 35 (DIN rail 35 mm).NPU could be also mounted with two screws M4 (with span 60mm) to a mounting board. For thisalternative it is necessary to take out and turn clamp on the rare side of the box.

NPU has four operating push-buttons. The SET button (for settings) can be protected with cover (fixed bywire with two seals). The NPU has an LED display (four digits) and 10 LEDs for indication. Dimensions areon the figure.

115

,0

75,

0

100,0

Set

NPU PWRERR

L1 U U Uf

L2

L3


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3. Installation

Power Supply

There are two power supplies available for NPU units see also chapter 7 Order codes:NPU FUV/YYY/230VAC power supply is in range 90 250 VACNPU FUV/YYY/24VDC power supply is in range 16 110 VDCPower supply polarity is not important in the case of DC power. The terminal PE is only as an anti-interference terminal.

Analog Inputs

The rated voltage (100, 230, 400, 480 VAC) is selected by order. Terminals are designed for connection ofeither phase-to-phase or phase-to-neutral voltage measurement. For connection see wiring diagram.

Output Relays

See wiring diagram. Relays on figure are without supply voltage (failure situation)


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The NPU Unit Wiring Diagram

Connection NPU Unit to phase-to-neutral voltage

11 14 12 21 24 22 31 34 32 41 44 42 A1 PE A2

2L1 3L11L1 2L2 3L21L2 2L3 3L31L3

POWER SUPPLYSWITCHED CONTACTSOF SIGNAL RELAYS

CONNECTION NPU UNIT TO PHASE-TO-NEUTRAL VOLTAGE


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Connection NPU Unit to phase-to-phase voltage

11 14 12 21 24 22 31 34 32 41 44 42 A1 PE A2

POWER SUPPLYSWITCHED CONTACTSOF SIGNAL RELAYS

CONNECTION NPU UNIT TO PHASE-TO-PHASE VOLTAGE

L1L2L3PE

2L1 3L11L1 2L2 3L21L2 2L3 3L31L3


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4. Function

Protection types

Overvoltage protectionThe protection responds to raising the voltage above set threshold with its own delay (see the descriptionbelow and the Set A table on page 18 as well). Limits can be set for any phase extra. By setting zerovalue the protection is switched off. See the correspondings parameters:

The first stage of overvoltage threshold:

Overvoltage limit 1 L1 A15Overvoltage limit 1 L2 A16

Overvoltage limit 1 L3 A17Overvoltage delay 1 A18

The second stage of overvoltage threshold:

Overvoltage limit 2 L1 A19Overvoltage limit 2 L2 A20Overvoltage limit 2 L3 A21Overvoltage delay 2 A22

Undervoltage protection

The protection responds to voltage drop under set threshold with its own delay (see the description belowand the Set A table on page 18 as well). Limits can be set for any phase extra. By setting zero value theprotection is switched off.

The first stage of undervoltage threshold:

Undervoltage limit 1 L1 A23Undervoltage limit 1 L2 A24Undervoltage limit 1 L3 A25Undervoltage delay 1 A26

The second stage of undervoltage threshold:

Undervoltage limit 2 L1 A27

Undervoltage limit 2 L2 A28Undervoltage limit 2 L3 A29Undervoltage delay 2 A30

Overfrequency protectionThe protection responds to raising frequency above set threshold with its own delay (see the descriptionbelow and the Set A table on page 18 as well). Limit is common for all three phases. By setting zero valuethe protection is switched off.


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The first stage of overfrequency threshold:

Overfrequency limit 1 A7Overfrequency delay 1 A8

The second s tage of overfrequency threshold:Overfrequency limit 2 A9Overfrequency delay 2 A10

Underfrequency protectionThe protection responds to fall frequency under set threshold with its own delay (see the description belowand the Set A table on page 18 as well). Limit is common for all three phases. By setting zero value theprotection is switched off.

The first stage of underfrequency threshold:

Underfrequency limit 1 A11

Underfrequency delay 1 A12

The second stage of underfrequency threshold:

Underfrequency limit 2 A13Underfrequency delay 2 A14

Voltage asymmetry protectionThe protection responds to raising of the voltage difference between any two phases above set thresholdwith its own delay (see the description below and the Set A table on page 18 as well). By setting zerovalue the protection is switched off.

Voltage asymetry limit A31Voltage asymetry delay A32

Vector shift supervisionThe protection responds to voltage vector shift (e.g. this can be caused by jump loading generator). Nodelay it is possible to adjust. By setting zero value the protection is switched off. The vector shiftsupervision delay (see the description below and the Set A table on page 18 as well) can be set from 0 sto 99.98 s (skip factor 20 ms) only at power supply switch on. It could be used when connecting ofasynchronous generators to the mains.

Vector shift limit A33Vector shift evaluation delay on voltage connection A34

Note:When NPU unit cooperates with the Inteli ComAps controller, wire the relay output of vector shiftprotection to the circuit breaker to open the circuit breaker directly and then wire the relay output to the BI:Ext MF relay of the controller.


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Phase sequence supervision

Phase sequence supervision checks the right sequence. The angle has to be at interval (120 30)among voltage vectors. The right phase sequence is L1L2L3. The LEDs L1, L2 and L3 are red flashingat incorrect phase sequence. If the voltage is too small (approx.


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The RE2 relay opens immediately when Vector shift protection is activated. RE2 closes back after the timegiven by parameterB5. The relay doesnt open (doesnt indicate a new failure) until all active failures aregone. LED ERR copies the state ofRE2.In example on the following drawing there are theA26, A30 - Under voltage delays.

Relay RE3:The relay RE3 opens at any failure with delay given by active protection (see the Set A table on page 18as well):

Overfrequency delay 1 A8Overfrequency delay 2 A10Underfrequency delay 1 A12Underfrequency delay 2 A14Overvoltage delay 1 A18Overvoltage delay 2 A22

Undervoltage delay 1 A26Undervoltage delay 2 A30Voltage asymetry delay A32

The RE3 relay opens immediately when Vector shift protection is activated. RE3 stays opened until anyfailure is active and closes back immediately when no failure is active or with delay B6 in the case of vectorshift protection.In example on the following drawing it is Under voltage delayA26, A30.

Relay RE4:The relay RE4 opens at any failure with delay given by active protection (see the Set A table on page 18as well):

Overfrequency delay 1 A8Overfrequency delay 2 A10Underfrequency delay 1 A12Underfrequency delay 2 A14Overvoltage delay 1 A18Overvoltage delay 2 A22Undervoltage delay 1 A26Undervoltage delay 2 A30Voltage asymetry delay A32

The RE4 relay opens immediately when Vector shift protection is activated. RE4 closes after the time givenby parameterB4. The relay operates similar as RE2, but indicates any new failure.This feature is available from software version 1.5 (see parameterB11 to find your software version).In example on the following drawing it is Under voltage delayA26, A30.


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MODE 2 - funct ion of relays corresponds to certain protections (B3=1)

Relay RE1:

The RE1 relayopens at Undervoltage, Overvoltage or Voltage asymetry failure with delay given by (see

the Set A table as well):

Overvoltage delay 1 A18Overvoltage delay 2 A22Undervoltage delay 1 A26Undervoltage delay 2 A30Voltage asymetry delay A32

The RE1 relay will close back after the period of the failure + the period of the timerB4.

Note: When the failure has gone the relay stays open till the "additional" timer period will elapse and then

the relay will close back.

Relay RE2:The RE2 relayopens at Underfrequency or Overfrequency failure with delay given by (see the Set A tableon page 18 as well):

Overfrequency delay 1 A8Overfrequency delay 2 A10Underfrequency delay 1 A12Underfrequency delay 2 A14


Relay RE3:The RE3 relayopens at Vector shift failure immediately.


There is a dead time for Vector shift sensing after a voltage measurement input connection during a timegiven by the A34 delay

Relay RE4:The RE4 relayopens at both incorrect phase sequence or NPUs internal failure immediately.The RE4 relay will close back after the period of the failure.

Note: If there is no power supply, all relays are opened.


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Example: Evaluation of under voltage protection, B3=0

t[s]

U[V]

A15

A18


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Vector Shift Protection

The vector shift protection protects synchronous generator in parallel operation in case of mains failure byvery fast opening the coupling breaker. Automatic mains reclosing for synchronous generator is verydangerous. The mains voltage returning after 300 ms can meet the generator in asynchronous mode.

There are two main applications for vector protection:1. parallel mode only (no island mode)The vector protection controls the generator circuit breaker.2. parallel and island modeThe vector protection controls the mains circuit breaker.The NPU detects mains failure within 30 ms. The total time of disconnection is shorter than 100 msincluding disconnecting time of the circuit breaker.The requirement for generator disconnection comes on power change of more than 15% - 20%. Slowchanges of frequency (e.g. governor commands) dont activate the protection.

Measuring principleWhen a synchronous alternator is loaded, the rotor displacement angle is build between the terminalvoltage (mains voltage) g and the synchronous electromotive force e. Therefore a voltage difference

U is built between e and g. The rotor displacement angle between stator and rotor is depending onmechanical moving torque of the generator shaft. The mechanical shaft power is balanced with theelectrical feeder mains power and therefore the synchronous speed keeps constant.

In case of mains failure or auto reclosing the generator suddenly feeds a very high consumer load. The

rotor displacement angle is decreased repeatedly and the voltage vector g changes its direction to g.

MainsUe Ug Z

l1 l2U

Generator Mains/Load

Ue

Ug

In parallel with the mains

MainsUe U g Z

l 1

U

Generator Load

Ue

UgU

g

At mains fai lure


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As shown in the timing diagram the voltage jumps to an other value and the phase position changes. Thisprocedure is named phase or vector surge. NPU continuously measures the cycles, starting each zero upward slope. The time cycle is internally compared to the quartz table reference time. In case of vectorsurge the zero up ward is delayed and the device trips instantaneously. The trip angle andconsequently the sensitivity of the vector surge detection is adjustable.

Measuring principle


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5. Settings

Buttons

Parameters and quantities are divided into two sets. For transfer from one set to the other press MODEbutton for 5 seconds. See tables for these sets. Items (parameters and quantities) in tables are in the samesequence as on display.If the SET button is available (the SET button can be protected with panel fixed by two seals), parameterscan be adjusted by pressing ofSET button.

For transfer between items use (up arrow) or(down arrow).

Display and LEDs

Parameters or measured quantities are displayed on four digits display.The display switches on after pressing any button and switches off after the time given by B2. If B2 is 0,than the display never switches off. The display switch off also aborts unfinished parameter settings.The green LED PWR indicates power supply.Three-color LEDs L1, L2, L3 indicate the phase that corresponds to the data on display (yellow color) or toa failure LED (red color).

Three-color LEDs f, f, U, U,U, U, indicate failure type (red color) or data on display (yellow color).The three-color LED ERR follows either relay RE2 (red color id. RE2 is open, switches off if RE2 is closed)when B3=0 or each relay when B3=1. The LED ERR follows also NPU internal error (red flashing).Notes:

If any LED shines or flashes red the failure is indicated. The failure indication has always priority to anotherindications.

The LEDs L1, L2, L3, f, f, U, U,U, U, shine red immediately after failure (without delay). If RE2relay opens LEDs starts red flashing. The LED flashing is finished by pressing any button or the time givenby B2. Failures are not indicated by red LED flashing ifB2 is zero.

Parameters settings

Press the SET button and the first digit starts flashing. The flashing digit can be changed by pressing (+1)and (-1) buttons. The next digit is selected by pressing MODE button.If the required parameter value is displayed press the SET button again and the new value is stored. If anew value is out of allowed range the NPU sets it to proximate value.

Caution: a new value is applied immediately.


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6. Displayed Quantit ies and ParametersSet A:

No. Quantity(parameter)

Front panelsignals

Characterson display

Limits Step Unit

A1 Frequency in L1, L2, L3 Green L1,L2,L3 0,01 [Hz]

A2 Voltage L1 Green L1 1 [V]



A5 Max. phase asymmetry 1 [V]

A6 Max. vector shift in L1, L2, L3 Yellow L1 0,1 []

A7

A8Overfrequency limit 1

Overfrequency delay 1

Green f

Yellow f

0;4565

099,98

0,1

0,02

[Hz]

[s]

A9

A10Overfrequency limit 2

Overfrequency delay 2

Green f

Yellow f

0;4565

099,98

0,1

0,02

[Hz]

[s]

A11

A12

Underfrequency limit 1

Underfrequency delay 1

Green f

Yellow f

0;4565

099,98

0,1

0,02

[Hz]

[s]

A13

A14

Underfrequency limit 2

Underfrequency delay 2

Green f

Yellow f

0;4565

099,98

0,1

0,02

[Hz]

[s]

A15

A16

A17

A18

Overvoltage limit 1 L1



Overvoltage delay 1

Green L1, U

Green L2, U

Green L3, U

Yellow U

0999

0999

0999

099,98

1

1

1

0,02

[V]

[V]

[V]

[s]

A19

A20

A21

A22




Overvoltage delay 2

Green L1, U

Green L2, U

Green L3, U

Yellow U

0999

0999

0999

099,98

1

1

1

0,02

[V]

[V]

[V]

[s]

A23

A24

A25

A26

Undervoltage limit 1 L1



Undervoltage delay 1

Green L1, U

Green L2, U

Green L3, U

Yellow U

0999

0999

0999

099,98

1

1

1

0,02

[V]

[V]

[V]

[s]

A27

A28

A29

A30




Undervoltage delay 2

Green L1, U

Green L2, U

Green L3, U

Yellow U

0999

0999

0999

099,98

1

1

1

0,02

[V]

[V]

[V]

[s]

A31

A32

Voltage asymmetry limit

Asymmetry delay

Green U

Yellow U

0999

099,98

1

0,02

[V]

[s]


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A33

A34

Vector shift limit

Vector shift evaluation delay onvoltage connection

Green U

Yellow U

050

099,98

1

0,02

[]

[s]

Default setting

No. Quantity (parameter) Rated voltage100V 230V 400V 480V

A1 Frequency in L1, L2, L3A2 Voltage L1A3 Voltage L2A4 Voltage L3A5 Max. phase asymmetry

A6 Max. vector shift in L1, L2, L3A7, A9A8, A10

Overfrequency limitOverfrequency delay

52 (62) Hz2,5 s

52 (62)Hz2,5 s

52 (62) Hz2,5 s

52 (62) Hz2,5 s

A9, A13A10, A14

Underfrequency limitUnderfrequency delay

48 (58) Hz2,5 s

48 (58) Hz2,5 s

48 (58) Hz2,5 s

48 (58) Hz2,5 s

A11, A19A12, A20A13, A21A14, A22

Overvoltage limit L1Overvoltage limit L2Overvoltage limit L3Overvoltage delay

110 V110 V110 V2,5 s

253 V253 V253 V2,5 s

440 V440 V440 V2,5 s

528 V528 V528 V2,5 s

A15, A27A16, A28A17, A29A18, A30

Undervoltage limit L1Undervoltage limit L2Undervoltage limit L3Undervoltage delay

85 V85 V85 V2,5 s

196 V196 V196 V2,5 s

340 V340 V340 V2,5 s

432 V432 V432 V2,5 s

A31A32

Voltage asymmetry limitAsymmetry delay

15 V2,5 s

30 V2,5 s

60 V2,5 s

60 V2,5 s

A33A34

Vector shift limitVector shift evaluation delay onvoltage connection

202,5 s

202,5 s

202,5 s

202,5 s


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Set B:

No. Quantity

(parameter)

Front panel

signals

Characters

on displayLimits Step Unit

B1 Failure time signaling(red LEDs flashing time)

Flashing greenL1,L2

09999 1 [min]

B2 Display switch off time Flashing green

L1, L309999 1 [min]

B3 Function of the output relays RE1 RE4

Flash. yellow

L1, L2, L301 1

B4 When B3=0:Relay RE1, RE4 switch off time;

When B3=1:Relay RE1 switch off time after

failure

Flash. yellow

L1, L2099,98 0,02 [s]

B5 When B3=0:Relay RE2 switch off time

When B3=1:Relay RE2 switch off time afterfailure

Flash. yellow

L1, L3099,98 0,02 [s]

B6 When B3=0 or B3=1:Relay RE3 switch off time aftervector shift protection

Flash. yellow

U099,98 0,02 [s]

B7 Max. vector shift in L1, L2, L3 (frommanual reset)

Yellow

L1, L2, L3

00 []

B8 Angle between L1 and L2 Yellow L1, L2 1 []

B9 Angle between L2 and L3 Yellow L2, L3 1 []

B10 Display and LEDs brightness 09 1

B11 Software release

B12 Display and LEDs test All LEDsyellow

(no failure)

ERR red

Time delays are set with step 0.02 s (without relay drop out time - c. 0.01 s has to be added).The Max. vector shift (A6) is the highest measured value between data recovery on display.The Max. vector shift (B7) is the highest measured value between manual resets. This could be used for along-term monitoring of the grids vector shifts. Reset ofB7: Set zero like in the other parameters.Setting zero bold typed parameters switches off the appropriate protection.Exception: B2 set to zero makes the display shining continuously.


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7. Order codes

NPU - FUV / YYY / ZZZ

YYY measurement range: 100 / 230 / 400 / 480 VACZZZ power supply range: 230VAC / 24VDC

Order code

Frequency

protection

Voltage

protection

Voltage

asymmetry

protection

Vectorshift

supervision

Rated

voltage

Power

supply

voltage

NPU-FUV/100/230VACNPU-FUV/100/24VDC

Yes Yes Yes Yes

100V 230VAC24VDC


Yes Yes Yes Yes

230V 230VAC24VDC


Yes Yes Yes Yes

480V 230VAC24VDC


Yes Yes Yes Yes

480V 230VAC24VDC

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