SIEMENS SIPROTEC 4, 7SD610 UNIVERSAL DIFFERENTIAL PROTECTION RELAY

Product Description

Siemens Siprotec 4 Siprotec 7SD610 Universal Differential ProtectionRelay

The 7SD610 relay is a differential protection relay suitablefor all types of applications and incorporating all those functions requiredfor differential protection of lines, cables, and transformers. Transformersand compensation coils within the differential protection zone are protected bymeans of integrated functions, which were previously to be found only intransformer differential protection. It is also well-suited for complexapplications such as series and parallel compensation of lines and cables. Itis designed to provide differential and directional backup protection for allvoltage levels and types of networks.

The relay features high speed and phase-selective shortcircuit measurement. The unit is thus suitable for single-phase and three-phasefault clearance. Digital data communication for differential currentmeasurement is effected via fiber-optic cables, networks or pilot wiresconnections so that the line ends can be quite far apart. The serial protectioninterface (R2R interface) of the relay can flexibly be adapted to therequirements of all existing communication media. If the communication methodis changed, flexible retrofitting of communication modules to the existingconfiguration is possible.Apart from the main protection function, i.e. thedifferential protection, the 7SD610 has a full range of configurable emergencyand/or backup protection functions such as phase and earth over currentprotection with directional elements if voltage transformers are connected.Overload, under and over-voltage/frequency and breaker failure protection roundoff the functional scope of the 7SD610.

Protection Functions

1. Differential protection for universal use with power lines and cables on all voltage levels with phase-segregated measurement (87L)
2. Two line ends capability
3. Suitable for transformers in protected zone (87T)
4. Restricted earth-fault protection (87N) if a transformer is within the protection zone
5. Well-suited for serial compensated lines
6. Two independent differential stages: one stage for sensitive measuring for high resistance faults and one stage for high current faults and fast fault clearance
7. Breaker-failure protection (50BF)
8. Phase and earth overcurrent protection with directional element (50, 50N, 51, 51N, 67, 67N)
9. Phase-selective intertripping (85)
10. Overload protection (49)
11. Over/undervoltage protection (59/27)
12. Over/underfrequency protection (81O/U)
13. Auto-reclosure single/three-pole (79)

Control functions

• Command inputs for control of CB and disconnectors (isolators)

Monitoring functions

1. Self-supervision of relay and protection data (R2R) communication
2. Trip circuit supervision (74TC)
3. 8 oscillographic fault records
4. CT-secondary current supervision
5. Event logging / fault logging
6. Switching statistics

Front design

1. User-friendly local operation
2. PC front port for relay setting
3. Function keys and 14 LEDs f. local alarm

Communication interfaces

1. 1 serial protection data (R2R) interface
2. Front interface for PC connection
3. System interface

a)     IEC 61850 Ethernet

b)     IEC 60870-5-103 protocol

c)      PROFIBUS-DP, DNP 3.0 and MODBUS

4. Service / modem interface (rear)
5. Time synchronization via IRIG-B, DCF77 or system interface