| AL-BNR系列不锈钢中性接地电阻柜 |
| 添加时间：2018/11/24 14:20:45 浏览次数： |
| AL-BNR系列不锈钢中性接地电阻柜，用于 6～66kV交流电网中。在电缆供电的系统中，接地电容电流较大。当电流大于规定值时会产生弧光接地过电压。采用中性点电阻接地方式的目的就是给故障点注入阻性电流，使接地故障电流呈阻容性质，减小与电压的相位差，降低故障点电流过零熄弧后的重燃率，使过电压限制在相电压的2.6倍以内，提高继电保护的灵敏度作用于跳闸，从而有效保护系统正常运行。ENR-BNR变压器中性点接地电阻柜可安装于发电厂厂用电系统、变电所供电系统、工矿企业配电系统中，实现这些电网采用中性点经电阻接地的系统运行方式。 ENR series stainless steel neutral grounding resistance cabinet is used in 6-66 kV AC network. In the cable power supply system, the grounding capacitance current is larger. Arc grounding overvoltage occurs when the current is greater than the specified value. The purpose of using neutral point resistance grounding method is to inject resistance current into the fault point, make the fault current present resistance-capacitance property, reduce the phase difference with voltage, reduce the reburning rate after zero-crossing arc extinguishing of fault point current, limit the overvoltage to 2.6 times of phase voltage, and improve the sensitivity of relay protection to act on tripping. So as to effectively protect the normal operation of the system. The neutral grounding resistance cabinet of ENR-BNR transformer can be installed in power plant auxiliary power system, substation power supply system and power distribution system of industrial and mining enterprises to realize the system operation mode of neutral grounding through resistance. |
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