Identification of Various Internal Faults of Transformer Based on No-load Current Analysis
نویسندگان
چکیده
The internal faults of transformer can be identified by various techniques. The proposed technique is by the analysis of no-load current and harmonic contents present in it. The no-load current of transformer is non-sinusoidal for sinusoidal input voltage. And hence it contains harmonics in healthy condition of transformer. But if transformer has any internal fault then the no-load current magnitude and its harmonic content will vary depending upon the type of fault. The winding fault increases the %THDi and magnitude of noload current, whereas the core fault increases only the %THDi of no-load current. For winding fault if the inter-turn fault is on the primary side then both %THDi and magnitude of noload current increases but if the inter-turn fault is on secondary side then only magnitude of no-load current will increase. Keywords—Transformer Internal Faults, %THDi, No-load current analysis, Harmonics.
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