Analysis and Prevention Against Overvoltage in Process of 220kV Substation Operation
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摘要: 为了防范220kV变电站运行操作过程中的过电压现象, 通过对投切空载变压器、分合空载母线两种典型操作的分析, 从原理上阐述了空载变压器操作过电压和母线系统谐振过电压的产生原因, 提出了可以通过减小空载电流、减小变压器绕组电感、增大变压器寄生电容来减少操作过电压, 通过倒闸操作的优化和技术设备的改进来减少谐振过电压, 并对现场实例应用进行分析, 提出了具体的防范措施。实践证明, 220kV变电站运行操作过程中的过电压所产生的危害是完全可以防范的。Abstract: The overvoltage poses a huge threat on the power equipment and personal safety. In order to prevent against the overvoltage, by analyzing two kinds of typical operations which are switching on and off no load transformer and bus, the causes of “switching surge” and “resonance overvoltage” are demonstrated. It is proposed that the “switching surge” can be reduced by reducing the no load current, reducing the transformer winding inductance and increasing the transformer parasitic capacitance. The “resonance overvoltage” can be reduced through the switching operation optimization and technical equipment improvement. The preventive measures are suggested through on site example analysis. Practice proves that the hazards in the 220kV substation operation can be completely prevented.
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Keywords:
- 220kV substation /
- operation /
- overvoltage /
- analysis /
- prevention
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