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A new perspective for cost-efficient feeder protection
Numerical design
Integrated protection functions
Four standard IDMT curves as per IEC
Built-in measurement and fault
recording functions
Alphanumerical LCD display
Reliability and availability due to
internal self-supervision
Freely configurable output contacts
High immunity to electromagnetic interface
Non-volatile memory for fault data
Numerical Three Phase Overcurrent & Earth Fault Relay type NI 40 / 41
Technical Specifications NI 40 / 41 Series
1H
YT
80
00
01
-50
3
ABB Limited
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ANSIProtection functions51
50
51N
50N
Three-phase over current protection, low-set stage ( IDMT or DT )
Three-phase over current protection, high-set stage ( DT )
Earth fault protection, low-set stage ( IDMT or DT )
Earth fault protection, high-set stage ( DT )
Site selectable IDMT curves for low set stage
Four standard IDMT curves ( NI, VI, EI, LI ) as per IEC standard
Wide and accurate numerical settings with perfect long time stability
Latest five fault data recording
Measurement, monitoring and recording functionsMeasurement of 3 phase current in primary or secondary terms
Measurement of neutral current in primary or secondary terms
Extensive relay internal self supervision monitoring relay hardware and software
Trip lockout function
2 x 16 digit backlit LCD display
Control supply on, fault start / trip, relay internal failure indication LED's
Display of fault cause indication
Display and indications
Four accurate current inputs
Normally open heavy duty output contact
Two change over signalling output contacts
Freely configurable output contacts
Dedicated output contact for relay internal self supervision
Low burden on current transformer
Design immune to any kind of electromagnetic interference
Inputs and outputs
Relay design
Dimensions : 176 ( H ) x 146 ( W ). Depth behind panel only 158 mm
Relay case with a degree of protection according to IP54
Design confirming to requirements of IEC 60255 / IS 3231 standards
Relay application
For earth-fault protection in solidly earthed, resistance earthed and isolated neutral networks
industrial applicationsFor protection of transformers, capacitor banks, feeders of utility and
For selective short-circuit and time-over current protection of distribution networks
Connection diagram
