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Transient earth potential rise in gas insulated substations

机译:气体绝缘变电站的瞬态地电位上升

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Switching or dielectric breakdowns within GIS enclosures lead to voltage transients propagating towards the terminations. Amplitudes can range to 2.0 pu with risetimes of under 20 ns. At terminations, one component of the transient continues along the overhead conductor while another propagates back into the station along the exterior of the enclosures. Successive grounding bonds attenuate and shorten the duration of this component. The hazard when touching the enclosure depends on energy dissipated in the body, estimated from the potential squared and integrated over time, divided by an assumed body resistance of 500 ohm. This paper describes tests and models in support of EMTP simulations to review this body energy, as requested by some utilities.
机译:GIS机柜内的开关或介电击穿会导致电压瞬变传播到终端。幅度可以达到2.0 pu,上升时间不到20 ns。在终端处,瞬变的一个分量沿着架空导体继续,而另一分量则沿着外壳的外部传播回站内。连续的接地键会衰减并缩短该组件的持续时间。触摸外壳时的危险取决于体内耗散的能量,该能量是根据随时间推移的平方和积分电位除以假定的500欧姆人体电阻而估算的。本文描述了一些测试和模型,以支持EMTP仿真,以根据一些公用事业的要求来审查此人体能量。

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