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发明公开
CN109066607A 一种用于电网线路的变时限距离保护的电压加速方法和装置 有权

一种用于电网线路的变时限距离保护的电压加速方法和装置
摘要：
本发明提供一种用于电网线路的变时限距离保护的电压加速方法和装置，通过建立的潮流方向判据和故障过渡电阻判据判断是否需要对距离保护III段的动作时限进行调整，并在判据确认需要对距离保护III段的动作时限进行调整时，通过设定的计算公式进行距离保护III段的动作时限的修正。本发明所述的方法和装置对于安装在电网线路潮流受端的变时限距离保护，当线路发生经大电阻单相接地故障且仅距离保护III段动作时，能使距离保护III段的动作时限明显缩短。
摘要（英）：

The invention provides a voltage acceleration method and apparatus for time-varying distance protection of power grid lines, Whether the operation time limit of the distance protection section III needs to be adjusted is judged by the established power flow direction criterion and fault transition resistance criterion, and when the criterion confirms that the operation time limit of the distance protection section III needs to be adjusted, the operation time limit of the distance protection section III is corrected by the set calculation formula. The method and the device of the invention cansignificantly shorten the operation time limit of the distance protection section III when the line has a single-phase-to-ground fault through a large resistance and only the distance protection section III operates for the variable time limit distance protection installed at the power flow receiving end of the power grid line.

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