ABB REJ 527 Operator's Manual page 4

REJ 527
4
Directional or Non-Directional Earth-Fault Relay
Operator's Manual
3.3.3. Protection indications ....................................................... 23
3.3.4. I/O test .............................................................................. 23
3.3.5. Green indication LED ....................................................... 24
3.3.6. Yellow indication LED ....................................................... 24
3.3.7. Red indication LED ........................................................... 25
4. Technical Description ............................................................. 26
5. Service ...................................................................................... 27
5.1. General ........................................................................................ 27
5.2. Secondary testing ........................................................................ 27
5.2.1. Testing of the matching transformers ............................... 29
5.2.2. Testing of the zero-sequence voltage stage U
5.2.3. Testing of the non-directional earth-fault current
stages ............................................................................... 29
5.2.4. Testing of the self-supervision system (IRF) .................... 30
5.2.5. Testing of the binary input ................................................ 30
5.3. Spare parts .................................................................................. 30
6. Ordering Information .............................................................. 31
7. References ............................................................................... 32
8. Index ......................................................................................... 33
9. Customer Feedback ................................................................ 35
1MRS 751055-MUM
> ............ 29
0b