The no-load test of transformer is an important test for diagnosing core faults in transformers. Through the no-load test of a 35 kV three-phase double-winding transformer and the analysis of no-load test data under different test wiring conditions, the no-load test of a smallcapacity high-voltage transformer is studied to show a non-linear variation in no-load current from zero to the specified test voltage during the no-load test, and the analysis of the test research shows that the main cause of this phenomenon in such transformers is the three-phase unbalance of test voltage. When the neutral point of transformer is grounded, the zero-sequence current is the main cause of this phenomenon, rather than the capacitance current considered by the traditional literature. The research results are of reference significance for the analysis of noload current change in transformers.
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罗明才,马 进,刘 磊,徐会凯.变压器空载电流非线性变化原因研究[J].四川电力技术,2023,46(4):54-58. LUO Mingcai, MA Jin, LIU Lei, XU Huikai. Research on Causes of Nonlinear Variation of No-load Current in Transformer[J]. SICHUAN ELECTRIC POWER TECHNOLOGY,2023,46(4):54-58.