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Model Number
Current input
Binary Input port
Binary Output port
IDMT O/C (OC1, OC2)
DT O/C (OC1 – 4)
Instantaneous O/C (OC1 – 4)
IDMT Earth Fault O/C (EF1, EF2)
DT Earth Faiult O/C (EF1 – 4)
SEF protection (SEF1 – 4)
Phase U/C
Thermal O/L
NPS O/C
Broken conductor protection
CBF protection
Inrush current detector
Cold load protection
Auto-reclose
Trip circuit supervision
Self supervision
CB state monitoring
Trip counter alarm
alarm
∑I
y
CB operate time alarm
Fault records
Event records
Disturbance records
Modbus Communication
IEC60850-5-103 Communication
IEC 61850 communication (option)
Case width (mm)
E: current from residual circuit or CT
(*)
E
: current (Io) calculated from three-phase current in relay internal
IDMT: inverse definite minimum time
OC∗: phase overcurrent element
EF∗: earth fault element
Model 400 provides three phase and earth fault overcurrent protection.
Model 420 provides three phase, earth fault and sensitive earth fault protection.
Table 1.1.1 Series Members and Functions
400
401
3P + E
2
6
4
4
149
149
SE: current from core balance CT
O/C: overcurrent protection
O/L: overload protection
SEF: sensitive earth fault
7
GRE110 -
402
420
421
3P + E
+ SE
(*)
6
2
6
8
4
4
()
223
149
149
U/C: undercurrent protection
NPS: negative phase sequence
CBF: circuit breaker failure
6 F 2 T 0 1 7 2
422
820
821
2P + Vo + SE
6
2
6
8
4
4
()
223
149
149
3P: three-phase current
DT: definite time
- Quick Links:
- Inverse Time Overcurrent Protection
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