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Transient earth potential rise in gas insulated substations

机译:气体绝缘变电站瞬态地下潜在升高

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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外壳内的切换或介电故障导致朝向终端传播的电压瞬变。幅度可以在20ns下的速度范围内径到2.0 pu。在终端处,瞬态的一个部件沿着架空导体继续,而另一个部件沿着外壳的外部传播回电台。连续的接地键衰减并缩短该组件的持续时间。触摸外壳时的危险取决于身体中的能量,从电位平方和随时间集成的电位估计,除以假设的500欧姆的车身电阻。本文介绍了支持EMTP模拟的测试和模型,以便根据某些公用事业所要求查看此机身能量。

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