In case of fault or abnormal operation, cut off the circuit or alarm with the help of protective appliances. The measuring instrument can display various parameters in operation, adjust some electrical parameters, prompt or send signals for deviation from the normal working state, which is often used in power generation, distribution and substation.
1. The yellow green and red (a, B, c) three-phase lines are respectively led out from the distribution switch of the main distribution box, the light blue working zero line is led out from the working zero terminal, and the yellow green two-color PE protection zero line is led out from the PE terminal. (Note: the door and box of the main distribution box must be reliably connected with braided soft copper wire to protect the neutral, and the safe distance between the five lines);
2. The yellow, green and red three-phase lines of the line are connected to the main disconnector of the secondary distribution box, the light blue n line is connected to the N terminal of the leakage protector, and connected to the working zero line sub terminal board after passing the leakage protection;
3. The yellow and green PE line is connected to the PE board of the protection zero terminal board;
4. Lead out the three-phase line from the main disconnector of the second distribution box to the leakage protector;
5. Lead out the phase line from the terminal of leakage protector to the shunt disconnector; (Note: PE line cannot enter the leakage protector, because the action of the leakage protector at the end of the line will trip the level leakage protection and cause large-scale power failure);
6. The yellow, green and red three-phase lines are respectively led out from the shunt disconnector of the distribution box, the light blue working zero line is led out from the wiring terminal of N board, and the yellow and green two-color protection zero line is led out from the wiring terminal of PE board; (Note: braided soft copper wire must be reliably connected between the distribution box door and the box as protective neutral connection).
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