电力变压器操作冲击试验时等效电容的计算
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摘要
用感应法对电力变压器进行操作冲击试验时,为了预测操作冲击电压的波形是否满足要求,以及为了估计电压效率,需要先求出变压器受压时的等效电容值。文中推荐使用电压比平方折合法来计算等效电容,根据变压器理论中阻抗在原、副边间的折合原理,先将绕组对地(或其他绕组)电容换算到其顶端对地的等效电容,再将变压器高压侧的电容折合到低压侧。对单相和三相变压器的一些接线方式,文中给出了等效电容的计算方法和结果,相比其他方法文中方法更为简单和方便。
When the power transformer is subjected to the switching impulse test using inductive method,it is neces-sary to find the equivalent capacitance value of the transformer with voltage,for the purpose of predict whether thewaveform of switching impulse voltage meets the requirements and estimating the voltage efficiency. This paper rec-ommended the use of the converting method by square value of voltage-ratio to calculate the equivalent capacitance.According to the principle of equivalent impedance between the primary and secondary side of the transformer theo-ry,the capacitance of the winding to ground(or to other winding)is first converted to its top to ground,then the ca-pacitance of high voltage side will be equivalent to the low voltage side. For various connection modes of single phaseand three phase transformers,the calculation methods of equivalent capacitance and calculation results are given.Compared with other methods,the method introduced in this paper is simpler and more convenient
When the power transformer is subjected to the switching impulse test using inductive method,it is neces-sary to find the equivalent capacitance value of the transformer with voltage,for the purpose of predict whether thewaveform of switching impulse voltage meets the requirements and estimating the voltage efficiency. This paper rec-ommended the use of the converting method by square value of voltage-ratio to calculate the equivalent capacitance.According to the principle of equivalent impedance between the primary and secondary side of the transformer theo-ry,the capacitance of the winding to ground(or to other winding)is first converted to its top to ground,then the ca-pacitance of high voltage side will be equivalent to the low voltage side. For various connection modes of single phaseand three phase transformers,the calculation methods of equivalent capacitance and calculation results are given.Compared with other methods,the method introduced in this paper is simpler and more convenient
引文
[1]唐山供电局等三单位联合试验组.三相电力变压器的操作波试验[J].清华大学学报(自然科学版),1978,18(1):18-32.United Test Group of Tangshan Power Supply Bureau and Other Two Units.Switching impulse tests of three phase power transformer[J].Journal of Tsinghua University(Science and Technology),1978,18(1):18-32.
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[3]王敬侃.变压器做操作波试验时等效电容的估算[J].高电压技术,1979,5(3):30-35.WANG Jingkan.Calculations of equivalent capacitance of transforms in switching impulse voltage tests[J].High Voltage Engineering,1979,5(3):30-35.
[4]朱英浩.操作波冲击试验时应注意的技术问题[J].变压器,1988,25(6):2-3.ZHU Yinghao.Technical problems that should be paid attention to in switching impulse test[J].Transformer,1988,25(6):2-3.
[5]陈道辉.电力变压器操作冲击试验波形计算分析[J].变压器,1997,34(8):1-6.CHEN Daohui.Calculation and analysis of switching impulse test shape for power transformer[J].Transformer,1997,34(8):1-6.
[6]李光范,王晓宁,李鹏,等.1 000 k V特高压电力变压器绝缘水平及试验研究[J].电网技术,2008,32(3):1-6.LI Guangfan,WANG Xiaoning,LI Peng,et al.Insulation level and test technology of 1 000 k V power transformers[J].Power System Technology,2008,32(3):1-6.
[7]陈昌渔.电力变压器操作冲击试验电压波形的计算[J].高压电器,2016,52(1):27-29.CHEN Changyu.Calculations of test voltage waveform of switching impulse for power transformer[J].High Voltage Apparatus,2016,52(1):27-29.
[8]THIONE L,SPINELLI A,BOSSI A,et al.Switching impulse tests of EHV and UHV transformers[J].IEEE Trans.on PAS,1980,99(2):779-787.
[9]陈昌渔,王昌长,高胜友.高电压试验技术[M].北京:清华大学出版社,2017.CHEN Changyu,WANG Changchang,GAO Shengyou.High voltage testing technology[M].Beijing:Tsinghua University Press,2017.
[10]严璋,朱德恒.高电压绝缘技术[M].北京:中国电力出版社,2015.YAN Zhang,ZHU Deheng.High voltage insulation technology[M].Beijing:China Electric Power Press,2015.
[2]黄齐嵩.变压器进行操作波感应耐压试验时等效电容的计算[J].高电压技术,1979,5(3):21-29.HUANG Qisong.Equivalent capacitance calculation of the transformers applied switching impulse voltage by inductive method[J].High Voltage Engineering,1979,5(3):21-29.
[3]王敬侃.变压器做操作波试验时等效电容的估算[J].高电压技术,1979,5(3):30-35.WANG Jingkan.Calculations of equivalent capacitance of transforms in switching impulse voltage tests[J].High Voltage Engineering,1979,5(3):30-35.
[4]朱英浩.操作波冲击试验时应注意的技术问题[J].变压器,1988,25(6):2-3.ZHU Yinghao.Technical problems that should be paid attention to in switching impulse test[J].Transformer,1988,25(6):2-3.
[5]陈道辉.电力变压器操作冲击试验波形计算分析[J].变压器,1997,34(8):1-6.CHEN Daohui.Calculation and analysis of switching impulse test shape for power transformer[J].Transformer,1997,34(8):1-6.
[6]李光范,王晓宁,李鹏,等.1 000 k V特高压电力变压器绝缘水平及试验研究[J].电网技术,2008,32(3):1-6.LI Guangfan,WANG Xiaoning,LI Peng,et al.Insulation level and test technology of 1 000 k V power transformers[J].Power System Technology,2008,32(3):1-6.
[7]陈昌渔.电力变压器操作冲击试验电压波形的计算[J].高压电器,2016,52(1):27-29.CHEN Changyu.Calculations of test voltage waveform of switching impulse for power transformer[J].High Voltage Apparatus,2016,52(1):27-29.
[8]THIONE L,SPINELLI A,BOSSI A,et al.Switching impulse tests of EHV and UHV transformers[J].IEEE Trans.on PAS,1980,99(2):779-787.
[9]陈昌渔,王昌长,高胜友.高电压试验技术[M].北京:清华大学出版社,2017.CHEN Changyu,WANG Changchang,GAO Shengyou.High voltage testing technology[M].Beijing:Tsinghua University Press,2017.
[10]严璋,朱德恒.高电压绝缘技术[M].北京:中国电力出版社,2015.YAN Zhang,ZHU Deheng.High voltage insulation technology[M].Beijing:China Electric Power Press,2015.