ABB REJ 521 - Page 4

4
1MRS 752179-MUM
Earth-Fault Relay
Operator’s Manual
REJ 521
3.3.2. Indication messages .........................................................22
3.3.2.1. Alarm indication messages .................................22
3.3.2.2. Disturbance recorder indication ..........................23
3.3.2.3. Internal fault ........................................................23
4. Technical description ............................................................. 25
5. Service ......................................................................................26
5.1. General ........................................................................................26
5.2. Commissioning testing .................................................................26
5.2.1. Function test .....................................................................26
5.2.2. Binary input test ................................................................27
5.2.3. LED test ............................................................................27
5.3. Secondary injection testing ..........................................................27
5.3.1. Testing of the earth-fault measuring transformer ..............29
5.3.2. Testing of the earth-fault stages .......................................29
5.3.2.1. Low-set stage I
0
> ................................................29
5.3.2.2. High-set stage I
0
>> .............................................29
5.3.3. Testing of the self-supervision system (IRF) ....................30
5.4. Spare parts ..................................................................................30
6. Ordering information .............................................................. 31
7. References ...............................................................................32
8. Index ......................................................................................... 33
9. Abbreviations .......................................................................... 35
10.Customer feedback ................................................................36