Siprotec 7VK61 breaker managment protective relay for breaker failure protection

Product Description

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
• Over voltage/under voltage 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
• ÃSynchro-check with  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