Technical data

1MRS751108-MUM

Protection Relay

Technical Reference Manual, General

REX 521

5.1.9. Testing inputs and outputs ............................................. 30

5.1.10. Trip-circuit supervision ................................................. 31

5.1.11. Self-supervision ...........................................................33

5.1.11.1. Fault indication ............................................. 34

5.1.11.2. Fault indication texts .................................... 35

5.1.12. Serial communication ...................................................36

5.1.12.1. Optical communication port on the rear

panel ............................................................ 36

5.1.12.2. Isolated RS-485 connection on the rear

panel ............................................................ 37

5.1.12.3. Front panel optical connection for a PC ....... 37

5.1.12.4. The service pin located on the rear panel .... 37

5.1.12.5. SPA bus ....................................................... 37

5.1.12.6. LON ..............................................................39

5.1.12.7. IEC 60870-5-103 bus ...................................40

5.1.12.8. Modbus ........................................................ 41

5.1.12.9. DNP 3.0 Bus ................................................ 42

5.1.12.10. IEC 61850 communication by using

SPA-ZC 402 ................................................. 43

5.1.12.11. Profibus-DPV1 communication by using

SPA-ZC 302 ................................................. 43

5.1.13. Time synchronization ................................................... 44

5.1.14. Display panel (HMI) .....................................................45

5.1.15. Indication LEDs ............................................................ 45

5.1.16. Alarm LEDs ................................................................. 45

5.1.16.1. Special features of alarm LEDs .................... 46

5.1.16.2. Writing signal names on alarm LED label .... 46

5.2. Design description ....................................................................48

5.2.1. Technical data .............................................................. 48

5.2.2. Terminal diagram of REX 521: Basic ............................. 52

5.2.3. Terminal diagram of REX 521: Medium ......................... 53

5.2.4. Terminal diagram of REX 521: High (excluding H08 and

H09) ...............................................................................54

5.2.4.1. Terminal diagram of H08 and H09

configurations ............................................... 55

5.2.5. Terminal diagram of REX 521: Sensor .......................... 56

5.2.6. Terminal connections .....................................................57

6. Service ................................................................................... 59

7. Ordering information ............................................................ 61