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變壓器鐵芯高阻接地對(duì)繞組電容量和介損測(cè)試影響分析

來源：電工電氣發(fā)布時(shí)間：2022-02-28 10:28 瀏覽次數(shù)：729

變壓器鐵芯高阻接地對(duì)繞組電容量和介損測(cè)試影響分析

邱煒，高竣，陳佳，楊紅權(quán)，劉彥琴，劉鑫，蔡川，周波，郭超，程鵬

(國(guó)網(wǎng)四川省電力公司成都供電公司，四川成都 610041)

摘要：針對(duì)一起現(xiàn)場(chǎng)變壓器例行試驗(yàn)中出現(xiàn)電容量和介質(zhì)損耗 (介損) 數(shù)據(jù)異常案例，結(jié)合測(cè)試原理以及變壓器的結(jié)構(gòu)設(shè)計(jì)，建立等效 RC 電路模型進(jìn)行仿真分析，研究了變壓器鐵芯高阻接地對(duì)變壓器繞組電容量和介損測(cè)量影響的規(guī)律，并解釋了電容量和介損數(shù)據(jù)出現(xiàn)異常的原因。研究表明，鐵芯高阻接地時(shí)，會(huì)引起各繞組現(xiàn)場(chǎng)實(shí)測(cè)的電容量和介損數(shù)據(jù)異常，隨著接地電阻值增加，實(shí)測(cè)電容值略微減少，而介損數(shù)據(jù)會(huì)劇增；鐵芯高阻接地對(duì)各繞組現(xiàn)場(chǎng)實(shí)測(cè)的電容量和介損數(shù)據(jù)的影響程度還與被試?yán)@組自身真實(shí)電容量密切相關(guān)，被試?yán)@組自身真實(shí)電容量越大，其實(shí)測(cè)的電容量和介損數(shù)據(jù)受到鐵芯高阻接地的影響也越大。

關(guān)鍵詞：變壓器；電容量；介質(zhì)損耗；RC 等效模型；高阻接地

中圖分類號(hào)：TM406 文獻(xiàn)標(biāo)識(shí)碼：B 文章編號(hào)：1007-3175(2022)02-0028-05

Influence of High-Resistance Grounding of the Core on Capacitance and

Dielectric Loss Test of the Transformer Winding

QIU Wei, GAO Jun, CHEN Jia, YANG Hong-quan, LIU Yan-qin, LIU Xin, CAI Chuan, ZHOU Bo, GUO Chao, CHENG Peng

（Chengdu Power Supply Company, State Grid Sichuan Electric Power Company, Chengdu 610041, China）

Abstract: This paper takes an abnormal event of capacitance and dielectric loss data in a routine experiment of an on-site transformer as an example. It used the test principle and the structural design of the transformer to build an equivalent RC circuit model to simulate and analyze the instance. It studied the pattern which the influence of the grounding high-resistance transformer core on transformer windings capacity and dielectric loss measurement. It also explained the abnormal that the capacitance and dielectric loss data. Results showed that the measured capacitance and dielectric loss data became abnormal when the high-resistance iron core was in grounding mode. The capacitance value decreases slightly when the grounding resistance value increases. In this situation, the dielectric loss data rises sharply. The impact of the high-resistance grounding of the core on the measured capacitance and dielectric loss data of each winding is related to the capacitance of the tested winding itself. The influence of the grounding iron core on the measured capacitance and dielectric loss data determined by the capacitance of the tested winding.

Key words: transformer; capacitance; dielectric loss; RC equivalent model; high-resistance grounding

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變壓器鐵芯高阻接地對(duì)繞組電容量和介損測(cè)試影響分析