SIPROTEC 4 7VK61 - Breaker Management Relay
Description
The SIPROTEC 4 breaker management relay 7VK61 is a highly flexible autoreclosure, synchro-check and circuitbreaker failure protection unit. 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 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 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.
______________________________
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
CommunicatIon interfaces
• Front interface for connecting a PC
• System interface for connecting to a
control system via various protocols
– IEC 61850 Ethernet
– IEC 60870-5-103 protocol
– PROFIBUS-FMS/-DP
– DNP 3.0
• Rear-side service/modem interface
• Time synchronization via
– IRIG-B or DCF77 or system interface
The SIPROTEC 4 breaker management relay 7VK61 is a highly flexible autoreclosure, synchro-check and circuitbreaker failure protection unit. 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 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 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.
______________________________
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
CommunicatIon interfaces
• Front interface for connecting a PC
• System interface for connecting to a
control system via various protocols
– IEC 61850 Ethernet
– IEC 60870-5-103 protocol
– PROFIBUS-FMS/-DP
– DNP 3.0
• Rear-side service/modem interface
• Time synchronization via
– IRIG-B or DCF77 or system interface