Listing ID #4662828
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Contact Supplierthe siprotec 4 breaker management relay 7vk61 is a highly flexible autorecloser, synchro-check, and circuit breaker failure protection unit. This unit is used for the single and three pole 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 circuit breaker 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 under voltage 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.
functionÂ
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