| 中性点接地背景 |
| 添加时间：2019/3/26 15:52:19 浏览次数： |
| 中压电网以35KV、10KV、6KV三个电压应用较为普遍，其均为中性点非接地系统，但是随着供电网络的发展，特别是采用电缆线路的用户日益增加，使得系统单相接地电容电流不断增加，导致电网内单相接地故障扩展为事故。我国电气设备设计规范中规定35KV电网如果单相接地电容电流大于10A，3KV—10KV电网如果接地电容电流大于30A，发电机单相接地电流超过5A,都需要采用中性点经消弧线圈接地方式，而《城市电网规划设计导则》（施行）第59条中规定“35KV、10KV城网，当电缆线路较长、系统电容电流较大时，也可以采用电阻方式”。因对中压电网中性点接地方式，世界各国也有不同的观点及运行经验，就我国而言，对此在理论界、工程界也是讨论的热点问题，在中压电网改造中，其中性点的接地方式问题，现已引起多方面的关注，面临着发展方向的决策问题。 Medium-voltage network is widely used with three voltages: 35KV, 10KV and 6KV. They are all neutral non-grounded systems. However, with the development of power supply network, especially the increasing number of users using cable lines, the single-phase grounded capacitive current of the system keeps increasing, which leads to the expansion of single-phase grounded faults into accidents. The design code of electrical equipment in China stipulates that if the single-phase grounding capacitive current of 35KV power grid is greater than 10A, if the grounding capacitive current of 3KV-10KV power grid is greater than 30A, and the single-phase grounding current of generator is more than 5A, the bingxisuan.07858.netmojusl.37ix.com.cnmojuldlc.37ix.com.cnpprkeli.71ix.com weixinghulu.07858.netzaozhi.07858.netneutral point should be grounded by arc suppression coil. Article 59 of the Guidelines for Planning and Design of Urban Power Grid stipulates that "35KV, 10KV city power grid, when the cable line is longer, the grounding current of generator should be grounded When the capacitive current of the system is large, the resistance mode can also be used. As for the neutral grounding mode of medium-voltage power grid, different countries in the world have different opinions and operational experience. As far as our country is concerned, it is also a hot topic in the theoretical and engineering circles. In the transformation of medium-voltage power grid, the neutral grounding mode has attracted attention from many aspects and is facing the decision-making problem of development direction. |
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