变压器绕组直流电阻测试方法的优化
|
摘要
大型变压器铁心多采用磁化特性很硬的冷轧钢硅钢片,测试绕组直流电阻时将会在铁心中产生不同程度的剩磁。本研究分析了不同接线方式对铁心剩磁的影响,对比不同接线方式下铁心中的磁通变化情况,并以某500 kV变压器为例进行试验验证。结果表明:选择恰当的激励方向可以合理利用铁心中的剩磁对其他绕组进行助磁,从而缩短测试时间。
Because the transformer core is often made of cold-rolled steel silicon steel sheet with hard magnetization characteristic, different degrees of remanence would generate in the core when detecting the DC resistivity of winding. In this paper, the effect of different wiring methods on the remanence in transformer core was analyzed, and the variation of magnetic flow under different wiring methods was compared and verified by a 500 kV transformer. The results show that the remanence in the core can be reasonably used to assist magnetic of other winding when selecting the appropriate magnetization direction, and the test time is shortened.
Because the transformer core is often made of cold-rolled steel silicon steel sheet with hard magnetization characteristic, different degrees of remanence would generate in the core when detecting the DC resistivity of winding. In this paper, the effect of different wiring methods on the remanence in transformer core was analyzed, and the variation of magnetic flow under different wiring methods was compared and verified by a 500 kV transformer. The results show that the remanence in the core can be reasonably used to assist magnetic of other winding when selecting the appropriate magnetization direction, and the test time is shortened.
引文
[1]李维波,毛承雄,陆继明,等.电力设备直流电阻测量用恒流源研究[J].电力自动化设备,2003,23(5):63-66.
[2]涂明涛,杨清华.典型变压器直流电阻缺陷的分析与诊断[J].高电压技术,2008,34(2):419-421.
[3]刘胜军,赵云涛,郭会永,等.110kV变压器损坏原因分析及处理[J].绝缘材料,2014,47(1):97-100.
[4]张春龙,姚景涛,赵远新,等.基于助磁法的变压器低压绕组直流电阻测试[J].内蒙古电力技术,2016,34(1):70-72,86.
[5]梁志瑞,甄旭锋,牛胜锁.大型电力变压器低压侧绕组直流电阻测试新方法[J].电力自动化设备,2007,27(6):27-31.
[6]于淼,朱孟周,陈光,等.1000kV特高压变压器快速试验系统设计[J].江苏电机工程,2016,35(6):22-25.
[7]孙宁强.主变压器低压绕组电阻的快速测量[J].江苏电机工程,2001,20(3):40-41.
[8]甄旭锋.电力变压器直流电阻快速测量的研究[D].保定:华北电力大学(河北),2007.
[9]戈文祺,汪友华,陈学广,等.电力变压器铁心剩磁的测量与削弱方法[J].电工技术学报,2015,30(16):10-16.
[10]刘连升,阴丽美,李宁,等.剩磁对大型电力变压器的危害及消除方法[J].变压器,2016,53(5):56-59.
[11]王朗珠,姚一平.“助磁法”在大型变压器低压侧直流电阻测试中的运用[J].高压电器,2003,39(2):59-60.
[12]宋文翠,陈朋,孙成田,等.变压器绕组直流电阻异常的分析与处理[J].变压器,2017,54(5):66-69.
[13]严玉婷,江健武,王亚舟,等.变压器直流电阻测试原理及现场缺陷情况分析[J].高压电器,2010,46(10):97-101.
[14]孙锋,陈志国,黄宝新.双通道助磁法电阻测量在温升试验中的应用[J].变压器,2014,51(4):68-69.
[2]涂明涛,杨清华.典型变压器直流电阻缺陷的分析与诊断[J].高电压技术,2008,34(2):419-421.
[3]刘胜军,赵云涛,郭会永,等.110kV变压器损坏原因分析及处理[J].绝缘材料,2014,47(1):97-100.
[4]张春龙,姚景涛,赵远新,等.基于助磁法的变压器低压绕组直流电阻测试[J].内蒙古电力技术,2016,34(1):70-72,86.
[5]梁志瑞,甄旭锋,牛胜锁.大型电力变压器低压侧绕组直流电阻测试新方法[J].电力自动化设备,2007,27(6):27-31.
[6]于淼,朱孟周,陈光,等.1000kV特高压变压器快速试验系统设计[J].江苏电机工程,2016,35(6):22-25.
[7]孙宁强.主变压器低压绕组电阻的快速测量[J].江苏电机工程,2001,20(3):40-41.
[8]甄旭锋.电力变压器直流电阻快速测量的研究[D].保定:华北电力大学(河北),2007.
[9]戈文祺,汪友华,陈学广,等.电力变压器铁心剩磁的测量与削弱方法[J].电工技术学报,2015,30(16):10-16.
[10]刘连升,阴丽美,李宁,等.剩磁对大型电力变压器的危害及消除方法[J].变压器,2016,53(5):56-59.
[11]王朗珠,姚一平.“助磁法”在大型变压器低压侧直流电阻测试中的运用[J].高压电器,2003,39(2):59-60.
[12]宋文翠,陈朋,孙成田,等.变压器绕组直流电阻异常的分析与处理[J].变压器,2017,54(5):66-69.
[13]严玉婷,江健武,王亚舟,等.变压器直流电阻测试原理及现场缺陷情况分析[J].高压电器,2010,46(10):97-101.
[14]孙锋,陈志国,黄宝新.双通道助磁法电阻测量在温升试验中的应用[J].变压器,2014,51(4):68-69.