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电力大数据:2019,22(8):-
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接地消弧装置导致PT铁磁谐振机理分析
杨文勇1, 刘丽1, 戴宇1, 李军1, 王俊1, 古展基2
(1.贵州电网有限责任公司毕节供电局;2.广州穗华能源科技有限公司)
The mechanism analysis of PT ferroresonance caused by grounding-type arc-extinguishing device
YANG Wenyong1, LIU Li1, DAI Yu1, LI Jun1, WANG Jun1, GU Zhanji2
(1.Bijie Power Supply Corporation of Guizhou Power Grid Co,Ltd,Bijie;2.Guangzhou Smart Energy Technology Co,Ltd)
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投稿时间:2018-12-01    修订日期:2019-01-28
中文摘要: 随着电缆的应用和配电系统的发展,发生单相接地故障时故障点电容电流幅值增大,可能会导致故障进一步发展,采用接地消弧装置能够有效地消除电容电流。在配置有接地消弧装置的中性点不接地配电系统中,接地消弧装置动作会导致配电系统状态变化,存在导致电磁式电压互感器(PT)铁芯饱和从而产生铁磁谐振的风险。通过分析接地消弧装置动作对配电系统状态造成的影响,综合考虑铁磁谐振回路特性和PT铁芯励磁特性,对PT铁磁谐振的产生原理进行研究。提出了一种基于谐振回路特性和铁芯励磁特性的能够表达谐振非线性过程的迭代计算方法,通过MATLAB计算验证了理论分析方法和迭代计算方法的有效性。
Abstract:With the application of power cable and the development of distribution system, the capacitance current at fault location will increase when single phase grounding fault occurs. The capacitance current may lead to further development of the fault and can be extinguished by using grounding-type arc-extinguishing device. In neutral point ungrounded distribution system that equipped with grounding-type arc-extinguishing device, the action of grounding-type arc-extinguishing device will change the present status of distribution system and may lead to saturation of the iron core of potential transformer (PT) and cause PT ferroresonance. The principle of the appearance of PT ferroresonance is studied by analyzing the influence on the distribution system caused by the action of grounding-type arc-extinguishing device and considering both the excitation characteristics of PT iron core and the characteristics of ferroresonance circuit. An iterative computing method base on the excitation characteristics of iron core and the characteristics of ferroresonance circuit that can represent the non-linear process of resonance is proposed. The theoretical analysis method and iterative computing method are proved effective by experiments on MATLAB.
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