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NPU Unit
Mains decoupling relay
Installation and Operation Instructions
Software version 1.8, September 2003
Prague, Czech Republic
Copyright © 2003 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
User guide
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Related Manuals for ComAp NPU
Summary of Contents for ComAp NPU
- Page 1 Software version 1.8, September 2003 ComAp, spol. s r.o. Prague, Czech Republic Světova 7, 180 00 Praha 8, Czech Republic Copyright © 2003 ComAp s.r.o. Tel: +420 2 66316661, Fax: +420 2 66316647 Written by Libor Šindelářl and Milan Vandírek E-mail: info@comap.cz, www.comap.cz...
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Page 2: Table Of Contents
Output Relays Example: Evaluation of under voltage protection Vector Shift Protection Settings Buttons Display and LEDs Parameters settings Displayed Quantities and Parameters Set A: Default setting Set B: Default setting Order codes NPU, SW Version 1.8, ©ComAp, September 2003 NPU-1.8r2.PDF... -
Page 3: Technical Specification
Rated 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. -
Page 4: Npu Technical Specification
250V / 2A AC 200V/0,1A DC, 24V 3A DC - minimum load 1W / 1VA at U > 10V - lifetime 1x10 cycles Overvoltage category Class. III Time delay accuracy 0.2% +0÷30ms NPU, SW Version 1.8, ©ComAp, September 2003 NPU-1.8r2.PDF... -
Page 5: Npu Mechanical Design
NPU Mechanical Design The 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 this alternative it is necessary to take out and turn clamp on the rare side of the box. -
Page 6: Installation
3. Installation Power Supply There are two types of NPU units – see chapter 7 – Order codes: power supply is in range 90 ÷ 250 VAC NPU XXX/YYY/230VAC power supply is in range 16 ÷ 110 VDC NPU XX/YYY/24VDC Power supply polarity is not important in the case of DC power. -
Page 7: The Npu Unit Wiring Diagram
CONNECTION NPU UNIT TO PHASE-TO-NEUTRAL VOLTAGE 2L1 3L1 2L2 3L2 2L3 3L3 11 14 12 21 24 22 31 34 32 41 44 42 A1 PE SWITCHED CONTACTS POWER SUPPLY OF SIGNAL RELAYS NPU, SW Version 1.8, ©ComAp, September 2003 NPU-1.8r2.PDF... -
Page 8: Connection Npu Unit To Phase-To-Phase Voltage
CONNECTION NPU UNIT TO PHASE-TO-PHASE VOLTAGE 2L1 3L1 2L2 3L2 2L3 3L3 11 14 12 21 24 22 31 34 32 41 44 42 A1 PE SWITCHED CONTACTS POWER SUPPLY OF SIGNAL RELAYS NPU, SW Version 1.8, ©ComAp, September 2003 NPU-1.8r2.PDF... -
Page 9: Function
(A22) can be set from 0 s to 99.98 s (skip factor 20 ms) only at power supply switch on. It could be used when connecting of asynchronous generators to the mains. NPU, SW Version 1.8, ©ComAp, September 2003 NPU-1.8r2.PDF... -
Page 10: Phase Sequence Supervision
Flashing of LED ERR indicates NPU internal failure. Check all adjusted parameters. If ERR is still flashing, send NPU for repair. Output Relays RE1 and RE4 are used mainly for proper adjusting and tests of NPU parameters. RE2 and RE3 are used mainly for protection. Relay RE1: The relay RE1 opens at any new failure without delay. -
Page 11: Example: Evaluation Of Under Voltage Protection
Example: Evaluation of under voltage protection U[V] t[s] <A18 Relay RE2 Open Close t[s] Relay RE3 Open Close t[s] U[V] t[s] <A18 Relay RE1 Open Close t[s] Relay RE4 Open Close t[s] NPU, SW Version 1.8, ©ComAp, September 2003 NPU-1.8r2.PDF... -
Page 12: Vector Shift Protection
2. parallel and island mode The vector protection controls the mains circuit breaker. The NPU detects mains failure within 30 ms. The total time of disconnection is shorter than 100 ms including disconnecting time of the circuit breaker. The requirement for generator disconnection comes on power change of more than 15% - 20%. Slow changes of frequency (e.g. - Page 13 As shown in the timing diagram the voltage jumps to an other value and the phase position changes. This procedure is 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.
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Page 14: Settings
If the required parameter value is displayed press the SET button again and the new value is stored. If a new value is out of allowed range the NPU sets it to proximate value. Caution: a new value is applied immediately. -
Page 15: Displayed Quantities And Parameters
0,02 0÷99,98 Green ∆U Voltage asymmetry limit 0÷999 Yellow ∆U Asymmetry delay 0,02 0÷99,98 Vector shift limit Green U 0÷50 [°] Vector shift evaluation delay on Yellow U 0,02 0÷99,98 voltage connection NPU, SW Version 1.8, ©ComAp, September 2003 NPU-1.8r2.PDF... -
Page 16: Default Setting
60 V 60 V Asymmetry delay 2,5 s 2,5 s 2,5 s 2,5 s Vector shift limit Vector shift evaluation delay on 2,5 s 2,5 s 2,5 s 2,5 s voltage connection NPU, SW Version 1.8, ©ComAp, September 2003 NPU-1.8r2.PDF... -
Page 17: Set B
Reset of B6: 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. NPU, SW Version 1.8, ©ComAp, September 2003 NPU-1.8r2.PDF... -
Page 18: Default Setting
Max. vector shift in L1, L2, L3 (from manual reset) Angle between L1 and L2 Angle between L2 and L3 Display and LED’s brightness Software release Display and LED’s test NPU, SW Version 1.8, ©ComAp, September 2003 NPU-1.8r2.PDF... -
Page 19: Order Codes
7. Order codes NPU - XXX / YYY / ZZZ functions: FU / FUV measurement range: 100 / 230 / 400 / 480 power supply range: 230VAC / 24VDC Order code NPU-FU/100/230VAC 230VAC 100V NPU-FU/100/24VDC 24VDC NPU-FU/230/230VAC 230VAC 230V NPU-FU/230/24VDC...
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