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Energies 2011, 4(4), 628-643; doi:10.3390/en4040628

Model for Predicting DC Flashover Voltage of Pre-Contaminated and Ice-Covered Long Insulator Strings under Low Air Pressure

State Key Laboratory of Power Transmission Equipments & System Security and New Technology, College of Electrical Engineering, Chongqing University, Chongqing 400044, China
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Received: 28 February 2011 / Revised: 13 April 2011 / Accepted: 18 April 2011 / Published: 19 April 2011
(This article belongs to the Special Issue Future Grid)
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Abstract

In the current study, a multi-arc predicting model for DC critical flashover voltage of iced and pre-contaminated long insulator strings under low atmospheric pressure is developed. The model is composed of a series of different polarity surface arcs, icicle-icicle air gap arcs, and residual layer resistance. The calculation method of the residual resistance of the ice layer under DC multi-arc condition is established. To validate the model, 7-unit and 15-unit insulator strings were tested in a multi-function artificial climate chamber under the coexistent conditions of low air pressure, pollution, and icing. The test results showed that the values calculated by the model satisfactorily agreed with those experimentally measured, with the errors within the range of 10%, validating the rationality of the model. View Full-Text
Keywords: ice-covered insulator string; flashover; mathematical model; DC; low air pressure; pre-contamination ice-covered insulator string; flashover; mathematical model; DC; low air pressure; pre-contamination
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Hu, J.; Sun, C.; Jiang, X.; Yang, Q.; Zhang, Z.; Shu, L. Model for Predicting DC Flashover Voltage of Pre-Contaminated and Ice-Covered Long Insulator Strings under Low Air Pressure. Energies 2011, 4, 628-643.

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