Journal
IEEE TRANSACTIONS ON POWER DELIVERY
Volume 25, Issue 3, Pages 1599-1605Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRD.2009.2036262
Keywords
Inrush current; internal fault; power transformer; two-terminal network
Categories
Funding
- 111 project [B08013]
- National Science Foundation of China [50907021, 50777016, 50837002, 50607006]
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A novel scheme based on two-terminal network to distinguish the inrush current from the internal fault current in the power transformer is proposed. By eliminating the mutual flux linkage in the transformer loop equation, a two-terminal network containing only the winding resistance and the leakage inductance is generated. According to the absolute difference of active power (ADOAP) flowing into and consumed by the two-terminal network, the criterion to identify the internal fault is developed. A total of 162 experimental cases have been tested and the proposed method is able to reliably and accurately discriminate internal faults from inrush currents with easy implementation.
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