Features :

This unit is used for the single and threepole auto-reclosure of a circuit-breaker, after this circuit-breaker has tripped due to a fault. The synchro-check function ensures that the two circuits being reconnected by closing the circuit-breaker are within a defined safe operating state before the CLOSE command is issued.

The SIPROTEC 7VK61 is also applicable as circuitbreaker failure protection. A breaker failure occurs when the circuit-breaker fails to correctly open and clear the fault after single or three-pole trip commands have been issued by the protection. It is then necessary to trip the relevant busbar zone (section) to ensure fault clearance. Together with the above-mentioned protection functions, the following additional functions of the SIPROTEC 7VK61 can be applied: end-fault protection, pole-discrepancy protection, overvoltage protection and undervoltage protection. As a member of the numerical SIPROTEC 4 relay family, it also provides control and monitoring functions and therefore supports the user with regard to a cost-effective power system management.

Hardware

• Binary inputs: 7/20
• Binary outpurs: 5/18
• Text display
• Surface-mounting or flush-mounting housing

Communication interfaces

• System port
  – IEC 61850– IEC 60870-5-103
  – PROFIBUS DP
  – DNP 3
• Service port
  – DIGSI 4
  – Modem
• Front port
  – DIGSI 4
• Time synchronization via IRIG B, DCF 77 or system interface