| 引用本文: | 徐宏雷,郑 伟,王维洲,智 勇,李学仕,马 超,刘 巍.750 kV变压器高压侧空载合闸过电压因素分析[J].电力自动化设备,2011,31(8):0 |
| XU Honglei,ZHENG Wei,WANG Weizhou,ZHI Yong,LI Xueshi,MA Chao,LIU Wei.Analysis of overvoltage factors during primary-side closing of 750 kV transformer without load[J].Electric Power Automation Equipment,2011,31(8):0 |
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| 摘要: |
| 利用电磁暂态分析软件ATP-EMTP搭建了变压器空载合闸仿真模型，对750 kV变压器空载合闸过程进行了仿真，将仿真结果与某750 kV变电站主变启动试验过程中发生的过电压波形进行对比，并通过改变主变合闸条件进行仿真研究影响变压器高压侧空载合闸过电压的因素。提出变压器高压侧空载合闸产生的过电压波形由两部分组成，一部分为低压侧绕组耦合到高压侧绕组的稳态电压，其大小由变压器的合闸角决定；另一部分为断路器合闸产生的扰动在由变压器绕组电抗及变压器入口电容组成的振荡电路中产生的高次谐振，高次谐振电压通过振荡电路中的电阻逐渐衰减，衰减的速度与电阻值的大小成正比。 |
| 关键词: 750 kV 变压器 空载合闸 过电压 谐振 电磁暂态程序 计算机仿真 |
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| Analysis of overvoltage factors during primary-side closing of 750 kV transformer without load |
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XU Honglei1,2, ZHENG Wei2, WANG Weizhou2, ZHI Yong2, LI Xueshi3, MA Chao2, LIU Wei2
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1.Gansu Electric Power Corporation，Lanzhou 730050，China;2.Gansu Electric Power Research Institute，Lanzhou 730050，China;3.College of Mathematics，Lanzhou City University，Lanzhou 730070，China
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| Abstract: |
| The simulation model is built with ATP-EMTP for the closing without load of transformer and the closing process of a 750 kV transformer is simulated. Its overvoltage waveforms are compared with those of a 750 kV transformer startup test. The overvoltage factors during the primary-side closing of transformer without load are studied by simulations with different closing conditions and results show that，the overvoltage waveforms are composed of two parts：one is the steady voltage，coupled from low-voltage windings to primary side and influenced by its closing angle；the other is the high frequency resonance，caused by the disturbance of breaker operation and attenuated gradually according to the resistance of the oscillator circuit，which is composed of the reactance of transformer winding and the leakage capacitance of transformer. |
| Key words: 750 kV electric transformers closing without load overvoltage resonance EMTP computer simulation |
