NPT957

Transformer protection and voltage regulator

NP950 Series - Expert protection, Transformer voltage regulation range

The NPT957 is a transformer protection device with a differential protection function and an integrated automatic voltage regulator function.

The relay also provides complete current-based and voltage-based protection functions as well as full measurements.

You can add up to total 9 optional modules (I/O and other type of modules) into the device for extensive monitoring and control applications. The NPT957 communicates using various protocols, including the IEC 61850 substation standard.

#Protection, #Regulation, #Relay, #Transformer, #Voltage

A large I/O capacity

Automatic/manual voltage regulation and/or parallel voltage regulation (AVR)

Complete transformer protection functionality

2nd and 5th harmonic blocking

Automatic verification of connection group and nominal value settings

Overloading and through fault statistics for preventive maintenance

Communication interfaces	Double Ethernet RJ45 - 100Mbits/s HSR/PRP Double LC fibre Ethernet 100Mbits/s HSR/PRP Double RJ45 Ethernet 100Mbits/s Double ST fibre Ethernet 100Mbits/s RS232 RS485
Communication protocols	DNP 3.0 DNP 3.0 over TCP/IP HSR / PRP IEC 60870-5-101 IEC 60870-5-103 IEC 60870-5-104 IEC 61850 ed1 IEC 61850 ed2 IEC 61850-8-1 Goose IEC 61850-8-1 MMS Modbus I/O Modbus RTU Modbus TCP/IP SPA - Serial communication
Mesures and operations	Active energy — Active energy index (Ea+, Ea-) Active power — Active power (P) monitoring Apparent power — Apparent power (S) monitoring Currents — Phase currents (IL1, IL2, IL3) Frequency — Frequency monitoring Harmonics — Up to rank 31 Perturbography — 400 Hz to 3,2 kHz (8 to 64 samples per period) Power factor — Power factor monitoring – cos(φ) Q/P — Q/P – tan(φ) monitoring Reactive energy — Reactive energy index (Eq+, Eq-) Reactive power — Reactive power (Q) monitoring THD — Total harmonic distorsion Voltages — Phase voltages Zero-sequence current — Zero-sequence current, high sensitive input Zero-sequence voltage — zero-sequence voltage
Power supply	19 to 70 Vdc 80 to 265 Vac (50/60 Hz)
Software packages	A - Standard — Standard version B - AVR — Standard + Automatic Voltage Regulation fonction (AVR)
Type of option cards	1x 10 Mb Ethernet card 2 x RJ45 100Mb Ethernet & IRIG-B card 2 x RJ45 100MB Ethernet (HSR, PRP) 2 x ST type 100Mb Ethernet & IRIG-B card 4 x outputs 0..24 mA - 1 x input 0..4000 mA card 5x digital output card 8 x RTD input card 8x digital input card Optical fibre LC type 100MB for HSR, PRP RS 232 - Serial fibre Plastic-Plastic type RS 232 Serial fibre - Glass-Glass card RS 232 Serial fibre - Glass-Plastic card RS 232 Serial fibre - Plastic-Glass card
Current inputs	6
Sensitive current inputs	4
Voltage outputs	4
Disturbance records	100
Event logs	15000
Digital inputs	3
Digital outputs	5
Watchdog output	1
Indication LEDs	20
Number of optional modules	9