The optimal management of electrical power systems is based in particular on the reliability, availability and communication skills of protection, measurement and automation devices.
The NPV911 offers a modular voltage protection solution for substations. Voltage and frequency protection with optional cards (I/O, communication...) and powerful logic programming possibility make NPV911 optimal for demanding load shedding or automatic transfer applications.
The NPV911 communicates using various protocols including IEC 61850 substation communication standard.

MAIN FEATURES

  Hardware (standard)

• Large graphic display with customizable mimic
• Push buttons for local control of the up to 5 objects
• 16 freely configurable leds
• 4 voltage inputs
• 5+1 output units (standard)
• 3 digital inputs (standard)
• 1 Front Ethernet port, 1 rear Ethernet port, 1 rear RS485 port

  Protection Functions

• Overvoltage, 4 stages INST, DT or IDMT [59]
• Undervoltage, 4 stages INST, DT or IDMT [27]
• Zero sequence overvoltage, 4 stages INST, DT or IDMT [59N]
• Positive sequence under/overvoltage, negative sequence overvoltage, 4 stages INST, DT or IDMT [59P/27P/47]
• Vector jump [78]
• Over/under frequency, 8 stages INST or DT [81O/81U]
• Rate of change of frequency, 8 stages INST or DT or IDMT [81R]

  Disturbance and Event recording

• Up to 100 recordings @ 64 samples/cycle (3.2 kHz)
• Recording lenght configurable from 0.1 to 1800 seconds
• Pre trigger configurable from 5 to 95%
• Non-volatile event records: 15000

  MEasurement and Supervision

• Voltage measurements (UL1-UL3, U12-U31, U0, SS)
• Voltage harmonics (up to 31st)
• Disturbance recorder (3.2 kHz)
• Fuse failure (VTS)
• Trip circuit supervision [74TC]

  Control

• Controllable objects: 5
• Synchrocheck [25]
• 8 setting groups

  Communication protocols standard

• IEC 61850
• IEC 60870-5-103/101/104
• Modbus/RTU, Modbus TCP/IP
• DNP 3.0, DNP 3.0 over TCP/IP
• SPA

  Options (4 slots)

• Digital inputs optional: +8 per card
• Digital outputs optional: +5 per card (2 cards max.)
• Arc protection (12 sensors +2xHSO +BI)
• 2 x mA input + 6-8 x RTD input (2 cards max.)
• Double LC Ethernet 100Mb
• RS232 + serial fibre PP/PG/GP/GG (option)