NPT916

Transformer Differential protection

NP900 Series - Advanced protection

Transformer protection including an easy-to-implement differential protection function. It provides both low and high side overcurrent, earth-fault, negative sequence and two independent restricted earthfault instances. It can be applied for generator and motor differential protection as well.

The NPT916 communicates using various protocols, including the IEC 61850 substation communication standard.

#Differential, #Protection, #Relay, #Transformer

Predefined or custom connection group selection

2nd and 5th harmonic blocking

Automatic verification of connection group and nominal value settings

Through fault and overloading 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 Serial Optical fibre PP/PG/GP/GG
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 61850-8-1 Goose IEC 61850-8-1 MMS Modbus I/O Modbus RTU Modbus TCP/IP SPA - Serial communication
Mesures and operations	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) THD — Total harmonic distorsion Zero-sequence current — Zero-sequence current, high sensitive input
Power supply	19 to 70 Vdc 80 to 265 Vac (50/60 Hz)
Type of option cards	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
Disturbance records	100
Event logs	10000
Digital inputs	3
Digital outputs	5
Watchdog output	1
Indication LEDs	20