1: The 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 bus bars and down conductors are connected well, whether there is heat and discoloration at the joints, check whether the cable head and the wiring pile head are firm and reliable, check whether the ground wire is rusted, and the wiring pile head Whether it is fastened. All secondary circuit wiring connections are reliable and the insulation meets the requirements.

2: When checking the drawer switch, the drawer switch cabinet should be flexible when pushed in or pulled out, and the mechanical lock is reliable. Check that the automatic air switch operating mechanism on the drawer cabinet is in place and the wiring screws are tightened. Remove the dirt on the contactor contact surface and surroundings, and check whether the contactor contact is intact. If the contact contact is bad, if necessary, repair the contact surface slightly. If the contact is severely ablated (the contact point is worn to the original) 1/3 thickness), that is, the contact should be replaced. The power indicator and indicator are intact.

3: When repairing the capacitor cabinet, the main switch of the capacitor cabinet should be disconnected first, and the capacitors should be discharged to the ground one by one with a wire of 10mm2 or more. Handle in time and replace the discharge device, the wiring screws of the control circuit and the grounding device. After closing, the instruction part and automatic compensation part are debugged.

4: Overhaul of circuit breakers in power receiving cabinets and contact cabinets: After disconnecting all loads, shake out the circuit breaker with the handle. Re-tighten the wiring screws and check whether the elasticity of the blade meets the requirements. Whether the arc extinguishing grid is cracked or damaged, manually adjust the mechanical interlock opening and closing accuracy, check whether the contact of the contact is good, repair the contact surface if necessary, check the internal springs, gaskets, screws for looseness, deformation and fall off .