| Abstract: |
| Introduction: Event reports recorded by intelligent electronic devices (IEDs) such as digital relays and fault
recorders during disturbances depict the status and system parameters of the power system. Incorrect relay settings
and unknown system parameters can lead to relay misoperation but information regarding these are available by
performing a comprehensive analysis of fault records. Hence, it is necessary to regularly make a comprehensive
assessment of the functioning of the relay to ensure reliable operation.
Case description: The objective of this paper is to demonstrate various aspects of evaluating relay performance and
verifying circuit parameters which are used in relay settings using field data in two case studies.
Discussion and Evaluation: While scrutinizing the relay’s operation, this paper also presents key insights on
verifying circuit parameters using the same relay event records.
Conclusions: The lessons learned from the case studies presented in this paper will equip a protection engineer to
inspect the operation of a relay during a transmission line fault, help gain a better understanding of the fault event
and take possible actions to prevent future occurrence of similar events. |
| Key words: Event report, Fault analysis, Relay |
| DOI：10.1186/s41601-018-0094-0 |
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| Fund: |
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