| 概述
An overview of the editor
电网中性点接地方式是一个综合性的、系统性的问题，既涉及到电网的安全可靠性、也涉及电网的经济性。在6-35KV电网，我国基本上采用中性点不接地或消弧线圈（谐振）接地方式。近20多年来一些城市电网负荷迅速增长、电缆线路增加很快、系统电容电急剧增加,在电缆线路为主的城市电网中采用不接地或经消弧线圈接地方式，因单相接地过电压烧坏设备的事故概率大大增加，为了解决这一矛盾，采用中性点经电阻接地方式。中性点经电阻接地是降低中压配电网内部过电压及消除谐振过电压的方式，对降低系统过电压水平、提高系统可靠性具有良好的效果。。
The neutral grounding method of the electric grid is a comprehensive and systematic problem, which involves the safety and reliability of the power grid and the economy of the grid. In the 6-35kv power grid, our country basically adopts the neutral ground or the anti-arc coil (resonance) ground. In recent 20 years the rapid growth of power load in some cities, cable line increase quickly, the system capacitance electricity has increased dramatically, mainly in the cable line not in city grid grounding or via arc suppression coil grounding mode, because of the accident probability of single-phase grounding overvoltage burn equipment has greatly increased, in order to solve this contradiction, is made of neutral point after resistance grounding method. Medium voltage distribution network neutral point grounding resistance is to reduce the internal overvoltage and resonance overvoltage of the most effective way to eliminate overvoltage level to reduce system, improve the system reliability has a good effect..
中性点接地电阻柜适用于6～35kV、50Hz中压配电电网中，是用于连接变压器或发电机与大地之间的一种限流保护电气设备。当配电网内部出现故障时（二相短路、单相接地、单相断路等），配电网中性点将产生偏移,此时中性点接地电阻将配电网中性点经电阻强制接地并限制其故障电流,使继电保护设备有足够时间进行检测实现跳闸和备用切换,避免配电网和电气设备遭到破坏。
The neutral ground resistance cabinet is suitable for the power distribution network between 6 ~ 35kV and 50Hz, which is used to connect transformer or generator to the earth to protect electrical equipment. When internal failure distribution network (two phase short circuit, single phase grounding, single-phase circuit, etc.), power distribution network neutral point will produce deviation, the neutral grounding resistance to distribution network neutral point by the grounding resistance force and limit the fault current, make the relay protection device has enough time for testing implementation tripping and standby switch, avoid the distribution network and electrical equipment damage. |