研究目的
To establish an equivalent relationship between the measured non-standard impulse voltage wave and the double exponential impulse wave (DEIW) specified by the IEC, and to evaluate the effects of waveform parameters on the breakdown characteristics of oil-impregnated paper (OIP) for transformers.
研究成果
The study successfully established U50% prediction mathematical models for OIP under DEIW and BOAIW, and proposed an evaluation method for waveform equivalence considering voltage amplitude and change rate. The method is feasible and accurate within the validated parameters, providing a theoretical basis for insulation coordination design and optimization.
研究不足
The study focuses on the breakdown characteristics of OIP under specific impulse voltage waveforms and may not cover all possible non-standard waveforms encountered in practical scenarios. The equivalence method is validated within a certain range of waveform parameters.
1：Experimental Design and Method Selection:
A test platform of multiparameter impulse voltage was set up to simulate the DEIW and BOAIW. The U50% of OIP under various waveform parameters was obtained through up-and-down tests.
2：Sample Selection and Data Sources:
Oil-impregnated paper samples were pretreated according to IEC and ASTM standards. The high-voltage signal was measured by a high-voltage divider and an oscilloscope.
3：List of Experimental Equipment and Materials:
MARX circuit for DEIW generation, RLC oscillation circuit for BOAIW generation, high-voltage divider, oscilloscope, column–column electrode structure for simulating the electric field in transformer winding insulation.
4：Experimental Procedures and Operational Workflow:
The U50% was obtained through up-and-down tests with 20 effective insulation tests for each pair of waveform parameters.
5：Data Analysis Methods:
The experimental data were fitted using logistic cumulative formula, and U50% prediction mathematical models were established based on the fitting results.
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