Title :
Negative-sequence relay protection for blown high-side transformer fuse detection
Author_Institution :
Southwest Arkansas Electr. Cooperative Corp., Texarkana, AR, USA
Abstract :
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
Keywords :
electric fuses; electricity supply industry; load (electric); power system protection; power system relaying; power transformer protection; power transformer testing; relay protection; transformer substations; blown high-side transformer fuse detection; customer appliance damage prevention; customer loads isolation; delta-wye substation power transformer; electric utilities; negative-sequence relay protection; single-phase loads; single-phasing conditions; sustained low voltages; three-phase loads; Circuit faults; Fuses; Leg; Low voltage; Power industry; Power transformers; Protective relaying; Substation protection; Synchronous motors; Windings;
Journal_Title :
Industry Applications, IEEE Transactions on
