Line current differential relay operation under severe current transformer saturation conditions

Relays rely on the current transformer to produce a secondary current that faithfully reflects the primary current for proper operation. In some instances this isn't the case. This paper will look at cases where severe ct saturation can be a problem, review the real time digital simulator input...

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Bibliographic Details
Main Authors: Hedding, R.A., Holst, S.
Format: Conference Proceeding
Language:English
Subjects:
Circuit faults
Current measurement
Current transformers
Digital relays
Power measurement
Power system protection
Power system relaying
Power transformers
Power transmission lines
Protective relaying
Online Access:Request full text
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Description
Summary:Relays rely on the current transformer to produce a secondary current that faithfully reflects the primary current for proper operation. In some instances this isn't the case. This paper will look at cases where severe ct saturation can be a problem, review the real time digital simulator inputs to the relay, and look at what mechanisms in modern line current differential relays are used to mitigate the problem.
DOI:10.1109/CPRE.2009.4982517