DC Flashover Performance of Various Types of Ice-Covered Insulator Strings under Low Air Pressure

Jianlin Hu,Zhijin Zhang,Caixin Sun,Lichun Shu,Daibo Xiao,Xingliang Jiang

doi:10.3390/en5051554

Jianlin Hu, Zhijin Zhang + Show 4 more

Open Access

https://doi.org/10.3390/en5051554

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Journal: Energies	Publication Date: May 21, 2012
Citations: 20	License type: CC BY 3.0

Affiliation: Chongqing University, Suizhou Central Hospital

Abstract

In this study, icing flashover performance tests of typical DC porcelain, glass, and composite insulators are systematically carried out in a multifunction artificial climate chamber. The DC icing flashover voltages of seven typical insulators under various conditions of icing thickness, pollution severity before icing, string length, and atmospheric pressure are obtained. The relationships between icing thickness, salt deposit density as well as atmospheric pressure and the 50% icing flashover voltage are analyzed, and the formulas are obtained by regression method. In addition, the DC icing flashover voltage correction method of typical porcelain, glass, and composite insulator in the coexisting condition of high altitude, contamination, and icing is proposed.

Highlights

In most cold climate regions of the World, overhead transmission lines and their substations are subject to ice accumulation for an extended period each year due to freezing rain or drizzle, in-cloud icing, icing fog, wet snow, or frost
The study explores the effects of various factors including ice thickness, pollution severity on insulator surfaces before ice accretion, and atmospheric pressure on the flashover performance of various types of insulators
Under the same icing conditions, ice weight and ice thickness on insulators are greatly affected by the insulator type, shed diameter, and installment placement

Summary

Introduction

In most cold climate regions of the World, overhead transmission lines and their substations are subject to ice accumulation for an extended period each year due to freezing rain or drizzle, in-cloud icing, icing fog, wet snow, or frost. The ice storm resulted in huge financial losses of power systems [11,12,13,14,15] This problem has motivated research including field observations, laboratory investigation of the icing process, measurement of critical flashover voltage on ice-covered insulators, and fundamental studies of arc development on ice surfaces. The present paper systematically explores the DC flashover performance of typical long porcelain, glass strings, and composite insulators under the coexisting conditions of high altitude, pollution, and icing in the multifunction artificial climate chamber of Chongqing University. It analyzes the effect of ice thickness, pollution severity, and altitude on flashover voltages of ice-covered insulator strings

Test Facilities

Specimens

Test Procedures and Methods

Simulation of High Altitude

Results and Analysis

Conclusions