ABB REJ601 User Manual

Section 4 1MDU07212-YN Rev. C
Protection and Control Function
18 REF601 / REJ601
Application Manual
4.2.3 Setting range of Earth fault Overcurrent Protection
Table 7: Setting ranges Non-directional earth fault protection, Low stage Io>, 51N
Description Value
Nominal value of earth current 1 A or 5A for CT variant, 1A for sensor variant
Setting range of pick-up current Io> External earth :
0.01...2.0 x In in steps 0.001, infinite
Internal earth :
0.1...2.0 x In in steps 0.001, infinite
Operate time delay (DT) to> 0.04...64 sec in steps of 0.01
Operating curve type (IDMT)
IEC 60255-3:
Normal inverse, Very inverse, Extremely inverse, Long-time
inverse
ANSI C37.112:
Moderate inverse, Normal Inverse, Very inverse, Extremely
inverse
Special curves:
RI inverse
Time multiplier setting ko (IDMT) 0.02...1.6, in steps of 0.01
Reset ratio IDMT : 0.96 and DT : 0.98
Reset time 40 Msec
Trig CBFP Yes / No
Table 8: Setting ranges Non-directional earth fault protection, High stage Io>>, 50N
Description Value
Setting range of pick-up current ‘Io>>’
External earth:
0.05...12.5 x In in steps 0.001, infinite
Internal earth:
0.5...12.5 x In in steps 0.001, infinite
Operation mode Definite time
Operate time delay (DMT)
‘to >>’
0.04...64 sec in steps of 0.01
Reset ratio 0.98
Reset time 40 msec
Trig CBFP Yes / No
4.3 Three Phase Inrush Detector
The transformer inrush detection is used to block overcurrent protection during
transformer inrush situations in distribution networks.
Transformer inrush detection is based on the ratio of 2
nd
harmonic current and the
fundamental frequency. When an inrush case is detected, the phase overcurrent and
earth fault protection functions are immediately blocked.
Table 9: Setting ranges Transformer inrush detector
Description Value
Inrush threshold value
0.2 ... 20 x In (Sensor Variant)
0.2 … 25 x In (CT variant)
Ratio Setting 30%...50%

ABB REJ601 Specifications

General

Brand	ABB
Model	REJ601
Category	Protection Device
Language	English