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NPF955 - Feeder Protection IED

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NPF955 - Feeder Protection IED

Current Protection
Voltage/Frequency Protection
Power Protection
Directional Protection
The NPF955 feeder protection device offers a modular feeder protection and control solution for applications that require a large I/O capacity.

You can add up to total 11 optional modules (I/O and other type of modules) into the device for extensive monitoring and control applications.

The NPF955 feeder protection device communicates using various protocols, including the IEC 61850 substation standard.
  • A large I/O capacity.
  • Double busbar control.
  • Optional automatic/manual voltage regulation and/or parallel voltage regulation (AVR).
  • Optional transformer module protections.
  • 5-shot scheme-controlled auto-recloser.
Product family: 
IEC 61850 - Protection and Control Relays
ANSI code : 
50/51 - Three phase overcurrent protection
50N/51N - Earth tank protection
67 - Phase directional overcurrent
67N - Earth directional overcurrent
67NT - Intermittent earth fault protection
46/46R/46L - Current unbalance / broken conductor protection
50H/51H/68H - Harmonic overcurrent protection / inrush blocking
50BF - Breaker failure with overcurrent
52BF - Breaker failure protection with position rise
87N - Cable-end differential protection
59 - Overvoltage
27 - Undervoltage
59N - Maximum of zero sequence voltage
47/27P/59NP - Positive sequence under/overvoltage protection
81O - Over frequency
81U - Under frequency
81R - Rate of change frequency
32 - Directional power
32R - Reverse active power
49F - Thermal overload for cable
49T - Thermal overload for transformer
21 - Distance relay
40 - Field failure
24 - Overfluxing
99 - Programmable functions
50ARC - Arc protection
50NARC - Arc protection
51V - Maximum overcurrent with voltage control
90 - Voltage regulator
79 - Autorecloser
79N - Zero sequence recloser
78 - Vector jump / surge
60 - Voltage balance
21FL - Fault locator
32N - Directional earth fault
32O - Overpower
32U - Underpower
21U - Underimpedance
RTD - Resistance temperature detectors
TST - Transformer status monitoring
CTS - Current transformer supervision
CBW - Circuit breaker wear monitoring
THD - Current total harmonic distortion
THD - Voltage total harmonic distortion

NP950 Series


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