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 NPF915 offers a modular feeder protection and control solution for applications requiring both current and voltage based protections along with complete measurements. Optional cards (I/O, communication...) are available for more comprehensive monitoring and control applications.
The NPF915 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
• 5 current inputs
• 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

• Three-phase overcurrent, 4 stages INST, DT or IDMT [50/51]
• Earth-fault (sensitive), 4 stages INST, DT or IDMT [50N/51N (S)]
• Directional overcurrent, 4 stages INST, DT or IDMT [67]
• Directional earth-fault, 4 stages INST, DT or IDMT [67N]
• Harmonic overcurrent / inrush blocking, 4 stages INST, DT or IDMT [50H/51H/68H]
• Current unbalance /broken conductor, 4 stages INST, DT or IDMT [46/46R/46L]
• Cable thermal overload protection [49L]
• Low impedance restricted earth fault / cable end differential [87N]
• 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]
• Over/under frequency, 8 stages INST or DT [81O/81U]
• Rate of change of frequency, 8 stages INST or DT or IDMT [81R]
• Vector jump [78]
• Over/Under/Reverse power [32/37/32R]
• Breaker failure protection [50BF/52BF]
• Arc protection (option) [50ARC]

  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

• Phase and residual currents (IL1, IL2, IL3, I01, I02)
• Voltage measurements (UL1-UL3, U12-U31, U0, SS)
• Fault locator [21FL]
• Current and voltage harmonics (up to 31st)
• Current THD
• Frequency (f)
• Power (P, Q, S, pf)
• Energy (E+, E-, Eq+, Eq-)
• Circuit breaker wear (CBW)
• Disturbance recorder (3.2 kHz)
• Current transformer supervision (CTS)
• Fuse failure (VTS)
• Trip circuit supervision (74TC)

  Control

• Controllable objects: 5
• Synchrocheck [25]
• Autorecloser [79]
• Cold-load pick-up block [68]
• Switch onto fault logic
• 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 (3 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)