变压器中性点过电压暂态过程的研究

2015 IEEE 5th International Conference on Power Engineering, Energy and Electrical Drives (POWERENG) Pub Date : 2015-05-11 DOI:10.1109/POWERENG.2015.7266320

U. Ilioitiene, A. Rožanskienė, D. Sakauskaite, Vidmantas Ticka Kaunas

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引用次数: 0

摘要

在中性点有效接地的电力系统中，大部分电力变压器的中性点是隔离的。隔离中性点由阀式避雷器保护，最近又用避雷器保护。雷电放电对线路电磁脉冲的行波进入变压器，造成变压器中性点过电压。如果避雷器的保护特性与绝缘不适当协调，则中性点区域的绝缘就会断裂。分析了开关柜避雷器的暂态过程和工作状态的特点及其对变压器绝缘的影响。

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Investigation of transient processes of overvoltages in transformer neutral

Neutral of major part of power transformers in electrical energy system with effectively earthed neutral is isolated. Isolated neutral is protected by valve-type arresters or lately by surge arresters. As a result travelling wave of lightning discharge to the line electromagnetic impulse is coming to transformer causing overvoltages in transformer neutral. If protective characteristics of surge arrester are improperly coordinated with insulation then insulation is broken in the area of neutral. This paper analyses character of transient processes and operating conditions of surge arresters in switchgear and it's influence to insulation of transformer.

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来源期刊

2015 IEEE 5th International Conference on Power Engineering, Energy and Electrical Drives (POWERENG)

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