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A Modified Selective Ground Relay for Ungrounded Distribution Systems
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 Title & Authors
A Modified Selective Ground Relay for Ungrounded Distribution Systems
Nam Soon-Ryul; Kang Sang-Hee; Park Jong-Keun;
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 Abstract
Selective ground relays (SGRs) are useful fur distinguishing a faulted feeder from the sound feeders in ungrounded systems. However, they sometimes mis-operate due to human or device errors. Particularly, the reversed polarity of zero-sequence current transducers (ZCTs) is the most frequent cause of mis-operation. This paper presents a modified SGR for reducing the probability of mis-operations caused by the reversed polarity of ZCTs. The modification is achieved by introducing an adaptive time delay, which depends on the magnitude of the zero-sequence current and the phase angle deviation from the reference. The modified SGR was successfully demonstrated on a sample ungrounded system without mis-operation.
 Keywords
Adaptive time delay;mis-operation;phase angle deviation;selective ground relay;ungrounded system;zero-sequence current transducer;
 Language
English
 Cited by
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The Characteristic Analysis Between Flux-Coupling and Flux-Lock Type SFCL According to Variations of Turn Ratios, IEEE Transactions on Applied Superconductivity, 2008, 18, 2, 737  crossref(new windwow)
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