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Negative-sequence relay protection for blown high-side transformer fuse detection

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1 Author(s)
Hannah, A. ; Southwest Arkansas Electr. Cooperative Corp., Texarkana, AR, USA

Single-phasing conditions caused by blown fuses on the primary of a delta-wye substation power transformer can create problems for electric utilities and the customers they serve. Sustained low voltages present during these conditions create problems for three-phase and single-phase loads. This paper outlines a method of detecting these single-phase conditions using negative-sequence relay technology. The paper also summarizes a method of isolating customer loads from the substation bus to prevent damage to customer appliances

Published in:

Industry Applications, IEEE Transactions on  (Volume:35 ,  Issue: 1 )

Date of Publication:

Jan/Feb 1999

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