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日期:2018-8-212.问题:10KV馈线发生短路故障,母线电压降低,发生甩负荷的现象。哪位高人有解决的好办法?
答案:发生甩负荷的现象,是因为10KV馈线发生短路故障后,母线电压降低,使其它10KV馈线的低电压保护动作造成的;要解决这个问题,可采取下面的方法:
1、在10KV馈线上加装限流电抗器,以限流短路电流数值;
2、合理调整10KV馈线开关保护定值的时限,在馈线发生短路时,快速切断事故源,防止母线电压“继续”降低;
3、适当降低10KV馈线开关低电压保护动作定值,使其能在低电压幅值上避开其它回路短路故障后的电压降低;
4、适当延长10KV馈线开关低电压保护动作时限定值,使其能在其它回路短路故障掉闸时间内不动作,使保护在时限上有选择性。
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