Transcription of Transformer Open Phase Detection - relayman.org
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Transformer Open Phase Detection - relayman.org
1 Abstract detecting an open primary Phase on a grounded-wye Transformer is difficult when the Transformer is unloaded. This paper describes the problem and presents an unconventional method that allows Detection of open primary phases using conventional protection class current transformers and readily available digital relays. Index Terms open Phase , current Transformer , offsite power. I. INTRODUCTION HIS paper describes a problem where an open primary Phase on a power Transformer at a generating station may go undetected. An innovative solution to this problem using conventional protection class current transformers (CTs) and digital protective relays is presented. This problem has been amplified due to its occurrence on auxiliary transformers used for offsite power at nuclear power stations. II. THE OPEN Phase PROBLEM A.
1 Abstract— detecting an open primary phase on a grounded- wye transformer is difficult when the transformer is unloaded. This paper describes the problem and presents an unconventional method that allows detection of open primary
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