剩余电流分级保护的必要性
The necessity of residual current classification protection
要在现有的农村低压电网中实现剩余电流分级保护是件十分具体、细致的工作。首先要对每一个配变的供电情况，需要有一个清晰的了解：有几路输出，有多少个用户，用电量如何，每天的变化情况如何等等。其次要对每条支路的用户情况做一个调查：用电设备的种类，用电的时间，用电量等。再次要对每条支路的剩余电流量做一个实地监测，查清每天的剩余电流变化情况，最大电流量、产生时间等等。通过这样细致的调查，才能对该台区的剩余电流分级保护制定了一个符合实际的详细的分级保护计划。
It is a very specific and detailed work to realize the residual current classification protection in the existing rural low-voltage power grid. First of all, we need to have a clear understanding of the power supply of each distribution transformer: how many output channels, how many users, how much power consumption, how the daily changes, etc. Secondly, we should make a survey on the users of each branch: the types of electrical equipment, the time of power consumption, power consumption, etc. Once again, we need to do a field monitoring of the residual current flow of each branch to find out the change of the residual current every day, the maximum current, the generation time and so on. Through such a detailed investigation, a detailed classification protection plan can be made for the residual current classification protection in this area.