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发明公开
CN103545798A 一种振荡闭锁中故障开放元件的距离保护方法 有权

一种振荡闭锁中故障开放元件的距离保护方法
摘要：
本发明涉及一种振荡闭锁中故障开放元件的距离保护方法，包括下述步骤：采集保护安装处三相电流和三相电压；判断是否进入振荡闭锁状态；若且转至倒数第二步，否则，转至下一步；若电流不对称度m≥0.65，开放距离保护；否则，转至下一步；若振荡中心电压中任一满足延时200ms开放距离保护I段，瞬时开放距离保护II段；否则，转至下一步；若中任一满足延时200ms开放距离保护I段，瞬时开放距离保护II段；否则，闭锁距离保护；若中任一满足时，延时150ms开放距离保护；否则，转至下一步；若中任一满足时，延时150ms开放距离保护；否则，闭锁距离保护。该方法提高振荡闭锁中故障开放元件的灵敏度，使距离保护在经较大过渡电阻故障时能够正确动作。
摘要（英）：

The invention relates to a distance protection method of fault opening elements in swing block. The distance protection method includes collecting three phase current and three phase voltage at protective mounting place; judging if entering swing block state or not; if yes, then go to the last but one step; if not, then go to next step; if degree of asymmetry of current is equal to and greater than 0.65, switching on distance protection; if not, then go to next step; if any voltage at swing center meets delayed 200ms opening distance protection I section, then opening distance protection II section instantly; if not, then go to next step; if any voltage at swing center meets delayed 200ms opening distance protection I section, then opening distance protection II section instantly; if not, block distance protection; if any voltage at swing center is met, then delaying 150ms opening distance protection; if not, go to next step; if any voltage at swing center is met, then delaying 150ms opening distance protection; if not, block distance protection; sensitivity of fault opening elements in swing block is increased, and distance protection is capable of performing right action after going through larger transition resistance fault.

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