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NPU, SW Version 1.8,

©

ComAp, September 2003

NPU-1.8r2.PDF 6

3. Installation

Power Supply

There are two types of NPU units – see chapter 7 – Order codes:
NPU XXX/YYY/230VAC

power supply is in range 90

÷

250 VAC

NPU XX/YYY/24VDC

power supply is in range 16

÷

110 VDC

Power 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 of
either 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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Содержание NPU

Страница 1: ...03 ComAp s r o Written by Libor Šindelářl and Milan Vandírek ComAp spol s r o Světova 7 180 00 Praha 8 Czech Republic Tel 420 2 66316661 Fax 420 2 66316647 E mail info comap cz www comap cz NPU Unit Mains decoupling relay Installation and Operation Instructions User guide ...

Страница 2: ...e 8 4 Function 9 Protection types 9 Overvoltage protection 9 Undervoltage protection 9 Overfrequency protection 9 Underfrequency protection 9 Voltage assymetry protection 9 Vector shift supervision 9 Phase sequence supervision 10 Frequency measurement 10 Internal watchdog 10 Output Relays 10 Example Evaluation of under voltage protection 11 Vector Shift Protection 12 5 Settings 14 Buttons 14 Displ...

Страница 3: ... voltages are 100 230 400 480 VAC selected by order see order codes Measuring voltage frequency 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 see order codes NPU offers following protections Over frequency protection Under frequency protection Over voltage protection Under voltage protection Phase sequence supervision Voltage a...

Страница 4: ...ange 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 25 C 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 rezisti...

Страница 5: ... screws M4 with span 60mm to a mounting board For this alternative 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 by wire with two seals The NPU has an LED display four digits and 10 LEDs for indication Dimensions are on the figure 1 1 5 0 75 0 100 0 Set NPU PWR ERR L1 U U U f ...

Страница 6: ...ge 16 110 VDC Power 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 of either phase to phase or phase to neutral voltage measurement For connection see wiring diagram Output Relays See wiring diagram Relays on figure are wi...

Страница 7: ... 7 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 3L1 1L1 2L2 3L2 1L2 2L3 3L3 1L3 POWER SUPPLY SWITCHED CONTACTS OF SIGNAL RELAYS CONNECTION NPU UNIT TO PHASE TO NEUTRAL VOLTAGE ...

Страница 8: ... 1 8r2 PDF 8 Connection NPU Unit to phase to phase voltage 11 14 12 21 24 22 31 34 32 41 44 42 A1 PE A2 POWER SUPPLY SWITCHED CONTACTS OF SIGNAL RELAYS CONNECTION NPU UNIT TO PHASE TO PHASE VOLTAGE L1 L2 L3 PE 2L1 3L1 1L1 2L2 3L2 1L2 2L3 3L3 1L3 ...

Страница 9: ...tting zero value the protection is switched off Underfrequency protection The protection responds to fall frequency under set threshold A9 with it s own delay A10 Limit is common for all three phases By setting zero value the protection is switched off Voltage assymetry protection The protection responds to raising of the voltage difference between any two phases above set threshold A19 with it s ...

Страница 10: ...y parameter B3 Another failure during B3 time has no effect Relay RE2 The relay RE2 opens at any failure with delay given by active protection A8 A10 A14 A18 A20 see table in the Chapter 6 Displayed Quantities and Parameters In example on the following drawing it is Under voltage delay A18 RE2 opens immediately when Vector shift protection is activated RE2 closes after the time given by parameter ...

Страница 11: ...U 1 8r2 PDF 11 Example Evaluation of under voltage protection t s U V A15 A18 A18 B4 L2 L1 A16 t s Relay RE3 Close Open Relay RE2 t s Close Open t s U V A15 B3 B3 A18 B3 B3 A18 A18 B3 L2 L1 A16 t s Relay RE4 Close Open Relay RE1 t s Close Open ...

Страница 12: ... generator disconnection comes on power change of more than 15 20 Slow changes of frequency e g governor commands don t activate the protection Measuring principle When a synchronous alternator is loaded the rotor displacement angle ϑ is build between the terminal voltage mains voltage g and the synchronous electromotive force e Therefore a voltage difference U is built between e and g The rotor d...

Страница 13: ... named phase or vector surge NPU continuously measures the cycles starting each zero up ward slope The time cycle is internally compared to the quartz table reference time In case of vector surge the zero up ward is delayed and the device trips instantaneously The trip angle ϑ and consequently the sensitivity of the vector surge detection is adjustable Measuring principle ...

Страница 14: ...onds to the data on display yellow color or to a 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 relay RE2 red color id RE2 is open switches off if RE2 is closed and also NPU internal error red flashing Notes If any LED shines or flashes red the failure is indicated The failure indication has always ...

Страница 15: ...s A9 A10 Underfrequency limit Underfrequency delay Green f Yellow f 0 45 65 0 99 98 0 1 0 02 Hz s A11 A12 A13 A14 Overvoltage limit L1 Overvoltage limit L2 Overvoltage limit L3 Overvoltage delay Green L1 U Green L2 U Green L3 U Yellow U 0 999 0 999 0 999 0 99 98 1 1 1 0 02 V V V s A15 A16 A17 A18 Undervoltage limit L1 Undervoltage limit L2 Undervoltage limit L3 Undervoltage delay Green L1 U Green ...

Страница 16: ... 2 5 s 48 58 Hz 2 5 s 48 58 Hz 2 5 s A11 A12 A13 A14 Overvoltage limit L1 Overvoltage limit L2 Overvoltage limit L3 Overvoltage delay 110 V 110 V 110 V 2 5 s 253 V 253 V 253 V 2 5 s 440 V 440 V 440 V 2 5 s 528 V 528 V 528 V 2 5 s A15 A16 A17 A18 Undervoltage limit L1 Undervoltage limit L2 Undervoltage limit L3 Undervoltage delay 85 V 85 V 85 V 2 5 s 196 V 196 V 196 V 2 5 s 340 V 340 V 340 V 2 5 s ...

Страница 17: ...al reset Yellow L1 L2 L3 0 0 B7 Angle between L1 and L2 Yellow L1 L2 1 B8 Angle between L2 and L3 Yellow L2 L3 1 B9 Display and LED s brightness 0 9 1 B10 Software release B11 Display and LED s test All LEDs yellow 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 ...

Страница 18: ...0 min B2 Display switch off time 10 min B3 Relay RE1 RE4 switch off time 5 s B4 Relay RE2 switch off time 5 s B5 Relay RE3 switch off time for vector shift protection 2 5 s B6 Max vector shift in L1 L2 L3 from manual reset B7 Angle between L1 and L2 B8 Angle between L2 and L3 B9 Display and LED s brightness 7 B10 Software release B11 Display and LED s test ...

Страница 19: ...VAC NPU FU 100 24VDC YES Yes Yes No 100V 230VAC 24VDC NPU FU 230 230VAC NPU FU 230 24VDC Yes Yes Yes No 230V 230VAC 24VDC NPU FU 400 230VAC NPU FU 400 24VDC Yes Yes Yes No 400V 230VAC 24VDC NPU FU 480 230VAC NPU FU 480 24VDC Yes Yes Yes No 480V 230VAC 24VDC NPU FUV 100 230VAC NPU FUV 100 24VDC Yes Yes Yes Yes 100V 230VAC 24VDC NPU FUV 230 230VAC NPU FUV 230 24VDC Yes Yes Yes Yes 230V 230VAC 24VDC ...

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