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