The troubleshooting of the leakage fault first determines whether the leakage is indeed. The R×10k block of the pointer multimeter can be used to measure the size of the insulation resistance of the road, or the digital multimeter is placed in the AC current block (this is equivalent to an ammeter), connected in series on the main switch, all switches are turned on, and all loads are removed. Including the bulb). If there is current, it indicates that there is leakage. After determining the line leakage, you can continue the inspection by following the steps below.
(1) Judgment is the leakage between the phase line and the neutral line, or the leakage between the phase line and the earth, or both. The method is to cut off the neutral line. If the current meter indication is unchanged, it is the phase line and the earth leakage; if the current meter indicates zero, it is the leakage between the phase line and the zero line; if the ammeter indication becomes smaller but not zero, it is the phase line and zero. Leakage occurs between the line, the phase line and the earth.
(2) Determine the leakage range. Remove the shunt fuse or open the circuit breaker. If the ammeter indication is unchanged, the bus leakage; if the ammeter indicates zero, it is shunt leakage; if the ammeter indication becomes smaller but not zero, it indicates bus or shunt There are leakages.
(3) Find the leakage point. After the above inspection, the switch of the line lamp is disconnected in turn. When the switch is turned off, the current meter indicates zero return, then the branch line leaks; if it is smaller, the branch line leaks, and there is leakage elsewhere; If all the lamps and lanterns are turned off and the current meter indication is unchanged, the section of the trunk is leaking. By narrowing the scope of the accident in turn, it is possible to further check whether the joints of the section of the line and the places where the wires pass through the wall are leaking. After finding the leakage point, the leakage fault should be eliminated in time.
[Important reminder] Short circuit, open circuit and leakage of lighting line are the most common faults. Only when we conduct specific measurement and analysis can we find out the fault point accurately, identify the nature of the fault, and take effective measures to eliminate the fault as soon as possible.
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