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在矿井中,电缆出线较多,井下作业条件较差,经常发生单相接地故障。由于发生单相接地故障,使非故障相对地电压升高,并可能造成电弧过电压等不良现象,故对于小电流接地系统发生单相接地故障应引起足够的重视。我国一些厂矿企业,常用母线绝缘监察和顺序断开线路等方法,来寻找接地故障,这将导致对某些用户供电的中断或造成人身触电事故。为防止事故,目前单相接地保护多采用另序电流互感器,对于如何正确地选型与使用该装置,谈谈个人的看法与体会。
In mines, cable outlet more downhole operating conditions are poor, often single-phase ground fault. Due to the occurrence of single-phase ground fault, the non-fault voltage relative increase, and may cause arc over-voltage and other undesirable phenomena, so for a small current grounding system single-phase ground fault should be given sufficient attention. Some factories and mines in our country often use methods such as bus insulation monitoring and sequential disconnection to find out the ground fault, which will cause the interruption of power supply to some users or cause personal electric shock accident. In order to prevent accidents, the single-phase grounding protection is mainly used to order current transformers. How to correctly select and use the device, talk about personal opinions and experiences.