Calculation of Electric-field Distribution and Research on Characteristics of Shielding Ring along the Long-rod Post Porcelain Insulators Used in 1000kv System

Wu, Xinqiao; Peng, Zongren; Liu, Peng; Yu, Zhongbo

doi:10.1109/icpadm.2006.284250

Cited by 3 publications

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“…As stated above, due to the effect of stray capacitance, the VDR of the test CVD exceeded the requirement of class 0.2 even adjusting the position of the medium-voltage tap. Some studies indicate that the metal shield and grading ring can compensate for the effect of stray capacitance, improve the distribution of electric field, and boost the voltage endurance and insulation strength of the high-voltage apparatus accordingly [14,15,39]. In this section, we analyze the effect of the shield on the VDR of the test CVD and optimize the structure parameters of the shield to reduce VDR further.…”

Section: Effect Of the Shield On The Vdr Of The Cvdmentioning

confidence: 99%

Studying the Effect of Stray Capacitance on the Measurement Accuracy of the CVT Based on the Boundary Element Method

et al. 2021

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The capacitive voltage transformer (CVT) is a special measuring and protecting device, which is commonly applied in high-voltage power systems. Its measurement accuracy is affected seriously by the stray capacitances of the capacitance voltage divider (CVD) to ground and other charged parts. In this study, based on the boundary element method, a mathematical model was established firstly to calculate the stray capacitance. Then, the voltage distribution of the CVD was obtained by the CVD’s equivalent circuit model. Next, the effect of stray capacitance on the voltage distribution and the voltage difference ratio (VDR) of CVD was analysed in detail. We finally designed three types of shield and optimized their structure parameters to reduce VDR. The results indicated that the average deviation rate between calculated and experimental measured voltages is only 0.015%; that is to say, the method has high calculation precision. The stray capacitance of the CVD to ground is far larger than that of the CVD to the high-voltage terminal. It results in the inhomogeneous distribution of voltage and the increase of VDR. For the test CVT, its VDR exceeds the requirement of class 0.2. Among all of the three types of shield, the C type reduced the VDR of the test CVT the most. After optimizing the structure parameters of C-type shield, the VDR is further reduced to 0.08%. It is not only in accord with the requirement of class 0.2 but also has an adequate margin.

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Section: Effect Of the Shield On The Vdr Of The Cvdmentioning

confidence: 99%