吸收法绝缘技术诊断中四元件等效电路元件参数单个值的测定

V. Kyrylenko, K. Kyrylenko
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摘要

本文的目的是提出一种确定四元等效电路参数的个别值的方法。方法。所提出的方法在于,每隔10 s以上的时间间隔,当充电指示灯不再对漏电流有贡献时,选取t1、t2、t3三个点,使t2 - t1 = t3 - t2。为了确定吸收系数R60/R15,建议取t1 = 15 s, t2 = 37.5 s, t3 = 60 s。同时,通过减去I(t2) - I(t1)和I(t3) - I(t2),可以排除吸收曲线的常数分量,从而可以确定广义等效绝缘电路参数的单个值,另外还可以使用其电导率的算子形式。结果。计算表明,根据所提出的方法,只有在这些参数的一定比例下才能正确确定绝缘等效电路的参数。几何电容的充电时间Cg(R0+Rd),其中R0和Rd是形成充电指数的电阻,传感器的电阻,应在0.2 s以内本文章由计算机程序翻译,如有差异,请以英文原文为准。
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Determination of individual values of four-element equivalent circuits elements parameters at technical diagnostics of insulation by absorption methods
The aim of this article is to present a methodology of determining of the individual values of the parameters of four-element equivalent circuits for insulation with through conductivity. Methodology. The proposed method consists in the fact that at a time interval of more than 10 s, when the charge indicator no longer contributes to the leakage current, three points t1, t2 and t3 are selected, such that t2 – t1 = t3 – t2. To be able to determine the absorption coefficient R60/R15, it is recommended to take t1 = 15 s, t2 = 37.5 s and t3 = 60 s. At the same time, by subtracting I(t2) – I(t1) and I(t3) – I(t2), the constant component of the absorption curve is excluded and it becomes possible to determine the individual values of the parameters of the generalized equivalent circuit of insulation, additionally using its conductivity in operator form. Results. As calculations show, the correct determination of the parameters of insulation equivalent circuit according to the proposed method is possible only with a certain ratio of these parameters. The charge time of the geometric capacitance Cg(R0+Rd), where R0 and Rd are the resistance that forms the charging exponent, and the resistance of the sensor, should be within 0.2 s
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