電壓互感器繞組沖擊過電壓研究
呂健雙1，馮天佑2，文遠(yuǎn)芳3
1 中南電力設(shè)計(jì)院，湖北 武漢 430071； 2 湖北省電力公司電力試驗(yàn)研究院，湖北 武漢 430077；
3 強(qiáng)電磁工程與新技術(shù)國家重點(diǎn)實(shí)驗(yàn)室(華中科技大學(xué))，湖北 武漢 430074
摘 要：電壓互感器在沖擊電壓作用下的電位梯度分布和表面場強(qiáng)分布是其繞組結(jié)構(gòu)和絕緣設(shè)計(jì)的重要依據(jù)。以幾種典型方案為例，介紹了如何建立25kV電壓互感器的內(nèi)部模型，計(jì)算單元參數(shù)，并利用ATP-EMTP電磁暫態(tài)計(jì)算程序建立仿真模型，得到多種方案的沖擊電壓分布，分析增設(shè)屏蔽層，優(yōu)化繞制，并接氧化鋅電阻片(MOV)等過電壓防護(hù)措施的作用，為電壓互感器絕緣結(jié)構(gòu)的優(yōu)化設(shè)計(jì)提供參考。
關(guān)鍵詞：電壓互感器；沖擊電壓；絕緣
中圖分類號(hào)：TM451 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1007-3175(2013)04-0012-05
Voltage Transformer Winding Impulse Over-Voltage Study
LV Jian-shuang1, FENG Tian-you2, WEN Yuan-fang3
1 Central Southern Electric Power Design Institute, Wuhan 430071, China;
2 Hubei Electric Power Testing & Research Institute, Wuhan 430077, China; 3 State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract: Potential gradient distribution and surface electrical field strength distribution of voltage transformer under impulse voltage effect are import basis for its winding structure and insulation design. Taking some typical plans for examples, this paper introduced how to establish 25 kV voltage transformer’s internal model, how to calculate unit parameters, and how to use ATP-EMPT electromagnetic transient calculation program to establish simulation model, to have got impulse voltage distribution of multi-plans. Analysis was made to functions of over-voltage protection measures, such as adding shielding layer, optimizing windings, connecting with metal oxide varistors (MOV), to provide references for optimizing design of voltage transformer insulation structure.
Key words: voltage transformer; impulse voltage; insulation
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