Analyzing the Moisture State of Oil-Paper Insulation System Using an Equivalent Circuital Model
Yang Feng1, Tang Chao1, Zhou Qu1, Du Lin2, Ran Liman3
1. College of Engineering and Technology Southwest University Chongqing 400716 China; 2. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China; 3. State Grid Chongqing Shibei Electric Power Supply Branch Chongqing 401147 China
Abstract Starting from the equivalent model of the dielectric response of oil-paper insulation — extended Debye model, the dielectric characteristic parameters are extracted by analyzing the variation patterns of the model parameters, so as to achieve the quantitative evaluation of the insulation dampness state. Firstly, oil-paper model bushings were used for the test with their condenser bodies absorbing different levels of moisture, and they were tested by frequency-domain dielectric spectroscopy (FDS) under different controlled temperatures. Using the obtained FDS spectrum and the combinational optimization algorithm GA-LMA, the branch parameters of the extended Debye model were identified. Then the characteristic parameters which characterize the moisture level of the oil-paper insulation system was proposed-the polarization resistance and the time constant of the branch that dominates the low-frequency properties of the model. Finally, the formulaic relationship between the above parameters and moisture content of insulation was established, which can be used to quantificationally determine the moisture content of oil-paper insulation.
Yang Feng,Tang Chao,Zhou Qu等. Analyzing the Moisture State of Oil-Paper Insulation System Using an Equivalent Circuital Model[J]. Transactions of China Electrotechnical Society, 2020, 35(21): 4586-4596.
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2020, Vol. 35 
