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Influence of Substation's Elements on Electromagnetic Transient Occurrences Caused by Disconnector Switching

机译:变电站元件对隔离开关引起的电磁暂态的影响

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This article presents the results of investigating switching overvoltages caused by the operation of disconnectors in air-insulated substations rated at 220 kV. Measurements of switching overvoltages were performed in air-insulated substations at the Hydro Power Plant Grabovica on the River Neretva and at the Thermo Power Plant Kakanj. These power plants are of great importance to the operation of the electric power system in Bosnia and Herzegovina. Operation of air disconnectors was investigated in order to determine the switching overvoltages' shapes and levels in primary and secondary circuits, which could cause malfunctioning of signaling devices or burning of protection relays' supply units. Results of computer simulations using an electromagnetic transients program are presented. Comparison of measured and calculated overvoltage values confirms their concordance. These comparisons proved computer calculation to be useful for investigating transient overvoltages due to disconnector switching. Furthermore, experimental and computing investigations on the 220-kV switchyard of the Hydro Power Plant Grabovica demonstrate an influence of substation's elements on the waveform of switching overvoltages.
机译:本文介绍了调查由额定电压为220 kV的空气绝缘变电站中的隔离开关操作引起的开关过电压的结果。开关过电压的测量是在涅雷特瓦河上的格拉波维察水力发电厂和卡坎尼热电厂的空气绝缘变电站中进行的。这些发电厂对于波斯尼亚和黑塞哥维那的电力系统的运行非常重要。为了确定一次和二次回路中开关过电压的形状和水平,对空气开关的操作进行了研究,这可能会导致信号设备故障或保护继电器的供电单元烧毁。给出了使用电磁瞬变程序进行计算机仿真的结果。测量和计算的过电压值的比较证实了它们的一致性。这些比较证明了计算机计算对于调查由于隔离开关引起的瞬态过电压很有用。此外,对格拉波维察水电站220 kV开关场的实验和计算研究表明,变电站的元件对开关过电压的波形有影响。

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