1. In the case of unbalanced three-phase leakage, electric shock and electric leakage can
operate reliably; 2. It can be put into operation normally under the condition of low insulation level of the line and large leakage current;
3. Strong anti-interference, lightning and power grid harmony Under interference conditions such as wave, line transient overvoltage, etc., no malfunction;
4. No action when line leakage is suddenly reduced, which reduces unnecessary power outages and has a higher commissioning rate;