Study on effects of DSE-Based instrumentation channel error correction on protective relays

•Investigates the effects of DSE-based instrumentation channel error correction on protective relays.•Discusses possible mis-operations of relays caused by CT saturation for three typical protection schemes: distance protection, current differential protection and setting-less protection.•Compares t...

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Bibliographic Details
Published in:Electric power systems research 2021-03, Vol.192, p.107002, Article 107002
Main Authors: Kong, Yuan, Meliopoulos, A.P. Sakis
Format: Article
Language:English
Subjects:
CT saturation
Electric currents
Error correction
Error correction & detection
Estimating techniques
Fault detection
Instrumentation channel error correction
Instruments
Relay
Relay mis-operation
Saturation
State estimation
Transformers
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Summary:•Investigates the effects of DSE-based instrumentation channel error correction on protective relays.•Discusses possible mis-operations of relays caused by CT saturation for three typical protection schemes: distance protection, current differential protection and setting-less protection.•Compares the relay responses with the estimated measurement samples and with the legacy measurement samples, respectively, for each protection scheme.•Improves the protection relay reliability using the estimated measurement samples. This paper presents the effects of dynamic state estimation (DSE)-based instrumentation channel error correction on protective relays. It discusses the possible mis-operations of relays caused by current transformer (CT) saturation for three typical protection schemes: distance protection, current differential protection and setting-less protection. For each protection scheme, it compares the relay responses with the estimated measurement samples and with the legacy measurement samples, respectively. Extensive cases have demonstrated that when large errors introduced by CT saturation, the legacy measurement samples can lead to slower operations for distance relay in case of internal faults, and unnecessary trip decisions during external faults for current differential relay and setting-less relay. In contrast, with the estimated measurement samples, the relays can correctly identify internal faults and avoid mis-operation in case of external faults.
ISSN:0378-7796
1873-2046
DOI:10.1016/j.epsr.2020.107002