Breaker-management device

Breaker-management device – SIPROTEC 7VK61

SIPROTEC 7VK61

The SIPROTEC 4 breaker management relay SIPROTEC 7VK61 is a highly flexible autoreclosure, synchro-check and circuitbreaker failure protection unit.

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Features & functions

Breaker-management device SIPROTEC 7VK61

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

Functions

Protection functions

  • Single and/or three-pole auto-reclosure

  • Synchro-check with live/dead line/bus measurement

  • Closing under asynchronous conditions (consideration of CB operating time)

  • Circuit-breaker failure protection with two stages (single and three-pole with/without current)

  • End-fault protection

  • Pole-discrepancy protection

  • Overvoltage/undervoltage protection

Control function

  • Commands f. ctrl. of CB and isolators

Monitoring functions

  • Operational measured values

  • Self-supervision of the relay

  • Event buffer and fault protocols

  • Oscillographic fault recording

  • Monitoring of CB auxiliary contacts

  • Switching statistics

Features

  • All functions can be used separately

  • Initiation/start by phase-segregated or 3-pole trip commands

  • Auto-reclosure for max. 8 reclose cycles

  • Evolving/sequential trip recognition

  • Auto-reclosure with ADT, DLC, RDT

  • Synchro-check with ΔV, Δϕ , Δf measurement

  • Breaker failure protection with highly secure 2-out-of-4 current check detectors

  • Breaker failure protection with short reset time and negligible overshoot time

Information

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