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首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Dielectric frequency response of oil-impregnated paper: The effect of partial discharges compared to other influences
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Dielectric frequency response of oil-impregnated paper: The effect of partial discharges compared to other influences

机译：浸油纸的介电频率响应：与其他影响相比，局部放电的影响

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摘要

In this paper, the influence of partial discharges (PD) on the subsequent dielectric properties of oil-impregnated paper (OIP) is investigated. Dielectric frequency response (DFR) of OIP is investigated at varied levels of moisture, thermal aging, temperature, oil conductivity and electrode material, to allow comparison of these influences. It is shown that PD activity inside OIP can significantly change the real and imaginary parts of permittivity of the paper layers, especially in the frequency range below 100 Hz. It is shown that even if the PD activity is concentrated on a few percent of the test sample, the real part of permittivity measured on the entire sample after a few tens of hours of PD activity can increase up to 10 times at very low frequencies (∼ 1 mHz) and the imaginary part of the permittivity can increase up to 100 times at low frequencies (∼ 1 Hz). The change of the real and imaginary parts of permittivity due to PD activity is permanent. It is very similar to the change caused by thermal aging, and somewhat similar to the change caused by moisture and higher oil conductivity. It is also shown that the dissipation factor of OIP in contact with copper and brass increases, even in the absence of PD, but contact with aluminum and stainless steel has no influence on DFR of OIP. The results suggest that the influence of PD can be significant when estimating the moisture content or the level of thermal aging of OIP with DFR method.
机译：本文研究了局部放电（PD）对油浸纸（OIP）后续介电性能的影响。在不同水平的水分，热老化，温度，油电导率和电极材料的情况下，对OIP的介电频率响应（DFR）进行了研究，以比较这些影响。结果表明，OIP内部的PD活性可以显着改变纸层介电常数的实部和虚部，尤其是在100 Hz以下的频率范围内。结果表明，即使PD活性集中在测试样品的百分之几上，PD活性几十小时后在整个样品上测得的介电常数的实部在非常低的频率下也可以增加10倍（大约1 mHz），并且在低频（〜1 Hz）时，介电常数的虚部最多可以增加100倍。由于PD活性，介电常数的实部和虚部的变化是永久性的。它与热老化引起的变化非常相似，而与水分和较高的油电导率引起的变化有些相似。还表明，即使在没有PD的情况下，与铜和黄铜接触的OIP的耗散因数也会增加，但是与铝和不锈钢的接触对OIP的DFR没有影响。结果表明，用DFR方法估算OIP的水分含量或热老化水平时，PD的影响可能很大。

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