Enhanced Numerical Breaker Failure Protection

Breaker failure (BF) protection provides backup for circuit breakers (CBs) and associated control wiring. Traditionally, CBs are not duplicated, but monitored by BF relays when ordered to trip. Upon a failure of a breaker to interrupt the current, the BF relay opens adjacent breakers to isolate the...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2008-10, Vol.23 (4), p.1838-1845
Main Authors: Kasztenny, B., Muthukrishnan, V., Sidhu, T.S.
Format: Article
Language:English
Subjects:
Algorithms
Applied sciences
Battery
Battery ground faults
breaker failure (BF) initiate
breaker failure (BF) protection
Circuit breakers
Circuit faults
Condition monitoring
Connection and protection apparatus
contact bouncing
contact oxidation
debouncing
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
Failure
Faults
Mathematical analysis
Mathematical models
Miscellaneous
Power networks and lines
Power system faults
Power system protection
Power system relaying
Power system stability
Protective relaying
Reproduction
Security
Studies
subsidence current
switching transients
Systems stability
Wiring
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Description
Summary:Breaker failure (BF) protection provides backup for circuit breakers (CBs) and associated control wiring. Traditionally, CBs are not duplicated, but monitored by BF relays when ordered to trip. Upon a failure of a breaker to interrupt the current, the BF relay opens adjacent breakers to isolate the problem. The total trip time under a BF condition is often tightly fit into the critical fault clearance time as determined by system stability. With narrow stability limits in today's power systems, coordination margins for the operation of BF functions are becoming scarce. This imposes a requirement for the fast reset time of BF protection. In its first part, this paper presents a novel algorithm for numerical current-based BF function with a fast 0.5-cycle reset time even under severe subsidence current. In the second part, the paper addressed the problem of fast and secure recognition of binary inputs for both BF initiation and BF detection based on the auxiliary breaker contacts. This novel algorithm works with analog representation of binary signals and provides security under induced transients, battery ground faults, and other interfering events.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2008.917931