Hebei Lezhong Metal Products Co

Contents and steps of maintenance of low-voltage distribution cabinet
Maintenance should start from the low-voltage side of the transformer. After the power distribution cabinet is powered off, clean the dust in the cabinet, check whether the busbar and down-lead wires are well connected, whether the joint points are heated and discolored, check whether the cable heads and wiring pile heads are firm and reliable, check whether the ground wires are corroded, and whether the wiring pile heads are Is it tight? All secondary circuit wiring connections are reliable and the insulation meets the requirements.
When checking the drawer-type switch, the drawer-type switch cabinet should be flexible when pushed in or pulled out, and the mechanical locking should be reliable. Check whether the automatic air switch operating mechanism on the drawer cabinet is in place and whether the wiring screws are tight. Clean the dirt on and around the contact surface of the contactor, and check whether the contact contact of the contactor is intact. If the contact contact is poor, file the contact surface slightly if necessary. If the contact is severely ablated (the contact point is worn to the original thickness/) the contacts should be replaced. The power indicator instrument and indicator light are intact.
When inspecting the capacitor cabinet, you should first disconnect the main switch of the capacitor cabinet, use one of the above wires to discharge the capacitors one by one to the ground, and then visually check that the shell is in good condition and there is no oil leakage. If the capacitor shell swells, It should be dealt with in time and the discharge device, control circuit wiring screws and grounding device should be replaced. After closing, debug the indicating part and automatic compensation part.
When inspecting the circuit breakers in the power receiving cabinet and contact cabinet, first disconnect all loads and then use the handle to shake out the circuit breaker. Retighten the wiring screws and check whether the elasticity of the knife edge meets the requirements. Check whether the arc extinguishing grid is cracked or damaged, whether the manual debugging of mechanical interlocking opening and closing is accurate, check whether the contact contact is good, repair the contact surface if necessary, and check whether the internal springs, gaskets, and screws are loose, deformed, or fallen off. .