Solutions   for   Protecting   andManaging   the   Electrical   Network

NP   E915

Energy management IED with IEC 61850 protocol

The optimal management of electrical power systems is based in particular on the reliability, availability and communication skills of protection, measurement and automation devices.
NPE915 is an energy management IED integrating a billing level accuracy kWh metering and fault location functionality in one single equipment. By combining highly accurate measurement technology and fault detection algorithms the NPE915 can be applied for Volt & Var optimization, tracking of power losses and reducing power outages by accurate fault location.
The NPE915 communicates using various protocols including IEC 61850 substation communication standard.

  • Input for Volt & VAR optimization
  • Impedance calculation for short-circuit fault location
  • Voltage presence detection


  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
  Fault location / indication
  • 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]
  • Undervoltage, 4 stages INST, DT or IDMT [27]
  • Zero sequence overvoltage, 4 stages INST, DT or IDMT [59N]
  • Fault locator [21FL]
  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)
  • Current and voltage harmonics (up to 31st)
  • Current THD
  • Frequency (f)
  • Power (P, Q, S, pf)
  • Energy (E+, E-, Eq+, Eq-)
  • Current transformer supervision (CTS)
  • Fuse failure (VTS))
  • 8 setting groups
  • Programmable logic functions
  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)


  Device Doc. Type Language Ref. Ind.
NP E915 Leaflet EN A942 H
NP E915 User Manual EN A973 B
NP E915 Connection/Definition Diagram EN S42479 G
Optional Boards Connection/Definition Diagram EN S42506 D