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柴油机组接地电阻柜的使用范围是什么
发布人:管理员   发布时间:2025-4-24
      柴油机组接地电阻柜的使用范围是什么?随着柴油机组发电在国内上的应用广泛,防止系统接地后损害机组,采用接地电阻柜可以降低接地电流,降低健全相的电压。在系统接地后,健全相的电压升高,会造成过电压保护设备误动作,电压过高甚至造成避雷器或过电压保护器损坏,影响系统运行。接地电阻安装于中性点上,会降低其他相电压升高,保护系统安全运行。
      在系统某相接地后,接地点的电流很大,电流会经过中性点传导到其他相。发电机组的中性线过电流有一定的限制,如果过大,就会坏中性线,甚至破坏整个线圈。加装接地电阻后,就会限制接地电流到某个合适的值,防止损坏继续扩大。
      按照相关的标准,接地电流一般设定在中性点最大通过电流的25%-40%之间。一般接地电阻电流设计为50A左右。还和系统机组多少和接地变压器接地方式等有关。接地电阻大都采用铁络铝电热合金制造,电导率高,温度系数高,可耐1400℃的高温,耐腐蚀性好,稳定性好。柜内一般标配电流互感器,检测接地电流信号后,有接地后可以及时报警。接地电阻柜加装电阻柜智能检测保护装置。可记录接地电流,接地时间,柜内的温度湿度,接地次数,设有485通讯接口,上传相关数据到主控室。
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