高电压技术2011，Vol.37Issue(9)：2205-2210,6.
换流变压器油纸绝缘复合电场击穿特性及其试验方法
Breakdown Characteristics of Oil-pressboard Insulation in Converter Transformer Under Composite Electric Field and Its Test Method
摘要
Abstract
In order to achieve the breakdown characteristics of the oil-pressboard insulation in converter transformer under combined AC-DC electric field,breakdown characteristics of transformer oil gap,oil-impregnated pressboard and oil-pressboard complex insulation under composite electric fields,including AC,DC and combined AC-DC electric field,are tested.Results show that breakdown field strength of oil gap hardly changes with the variation of AC voltage components.Breakdown field strength of oil-impregnated pressboard decreases rapidly with the increase of AC voltage components.With the influence of the characteristics of oil-impregnated pressboard,the breakdown field strength of oil-pressboard complex insulation increases dramatically with the decrease of AC voltage components.It is demonstrated that the breakdown field strength of oil gap is almost independent of AC voltage components,but that of oil-impregnated pressboard is highly influenced by AC voltage components.Accordingly,the effectiveness of AC and DC voltage tests on converter transformer is further discussed.It is found that the ceiling voltages which occur on oil gap and oil-impregnated pressboard of the converter transformer main insulation under operating voltage are still combined AC-DC voltages.The requirements of voltage amplitude of AC or DC voltage test can be satisfied,but the waveform is different from that of the operating voltage subjected by insulation.It is concluded that applying AC voltage test to check the oil gap insulation dielectric strength is effective.However,applying DC voltage test to check the oil-impregnated pressboard insulation dielectric strength is not adequate.关键词
高压直流/换流变压器/油纸绝缘/复合电场/击穿场强/交流电压试验/直流电压试验Key words
HVDC/converter transformer/oil and pressboard insulation/composite electric field/breakdown field strength/AC voltage test/DC voltage test分类
信息技术与安全科学引用本文复制引用
王永红,魏新劳,陈庆国..换流变压器油纸绝缘复合电场击穿特性及其试验方法[J].高电压技术,2011,37(9):2205-2210,6.基金项目
国家自然科学基金 （）
黑龙江省新世纪优秀人才支持计划 （）
