Leakage protection device installation and use - Database & Sql Blog Articles

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1 Before installation, it is necessary to check whether the rated voltage, rated current, short-circuit breaking capacity, leakage current, leakage current and leakage operation time of the leakage protector meet the requirements.
2 When installing the wiring of the leakage protector, it should be wired according to the wiring diagram shown in Table 3-8 according to the protection grounding type of the power distribution system. Separate the phase and neutral lines when wiring.

3 For the leakage protector with short-circuit protection, when the short-circuit current is disconnected, the exhaust hole on the power supply side often has an arc discharge, so it should ensure sufficient arcing distance in the arc discharge direction during installation.

4 Leakage protectors should be installed as far as possible from other ferromagnetic and current-carrying conductors with large currents.

5 The leakage protector used in the switch box of the construction site shall be splash-proof.

6 The working neutral line behind the leakage protector cannot be grounded repeatedly.

7The circuit adopting the graded leakage protection system and the branch line leakage protection, each branch line must have its own working zero line; the rated leakage current and leakage time of the upper and lower leakage protection devices should be matched with each other, the rated leakage current The step difference is usually 1.2 to 2.5 times, and the time difference is 0.1 to 0.2 s.

8 working zero line can not be wired nearby, single phase load can not be bridged at both ends of the leakage protector.

9 Lighting and other single-phase power loads should be evenly distributed to the three-phase power line. When the deviation is large, it should be adjusted in time to make the leakage current of each phase approximately equal.

10 Leakage protector should be tested after installation. The test has: test with test button 3 times, all should operate correctly; with load split AC contactor or switch 3 times, should not malfunction; each phase is grounded with 7kΩ test resistance Try to jump, it should be reliable.