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  • Description of Maintenance Method for Low Voltage Switchgear

    Release:kepunijt Browse:594second

    Low-voltage switchgear and control equipment, commonly known as low-voltage switchgear, also known as low-voltage distribution cabinet, refers to a complete set of electrical devices with AC and DC voltages below 1000V.

    With the construction and implementation of smart grid, infrastructure, investment in manufacturing industry and the development of new energy industry, the low-voltage distribution cabinet Market in China has maintained a rapid growth trend in recent years.

    Maintenance of low-voltage distribution cabinet is mainly to ensure the normal and safe operation of low-voltage distribution cabinet. Overall maintenance of low-voltage distribution cabinets should be carried out every year. Maintenance and repair should be completed with the minimum blackout time. Owner's blackout time should be determined in advance.

    The contents and steps of maintenance of low voltage distribution cabinet:

    1: The low-voltage side of the transformer should be the starting point for overhaul. After power failure, clean the dust in the cabinet, check whether the connection between bus and lead is good, whether the joint points are hot and discolored, check whether the cable head and connection pile head are firm and reliable, check whether the grounding wire is rusted, and whether the connection pile head is tight. All secondary circuit connections are reliable and insulation meets the requirements.

    2: When checking the drawer switch, the drawer switch cabinet should be flexible when pushing in or pulling out, and the mechanical locking is reliable. Check whether the automatic air switch operating mechanism on the drawer cabinet is in place and whether the connection screw is tightened. Clean the dirt on the contact surface and around the contactor, check whether the contact is in good condition, if the contact contact is not in good contact, if necessary, slightly repair the contact surface. If the contact is severely ablated (the contact is worn to 1/3 of the original thickness), the contact should be replaced. The power indicator and light are in good condition.

    3: When overhauling the capacitor cabinet, the main switch of the capacitor cabinet should be disconnected first. After discharging the capacitor to the ground one by one with a conductor of more than 10 mm2, the appearance of the shell is good and there is no leakage of oil. If the shell of the capacitor expands, it should be handled in time, and the wiring screw and grounding device of the discharge device, control circuit should be replaced. After closing, debug the indicating part and the automatic compensation part.

    4: Inspection and repair of circuit breaker in receiving cabinet and contact cabinet: After disconnecting all loads, shake the circuit breaker out with the handle. Retighten the connection screw to check whether the elasticity of the knife edge meets the requirements. Whether the arc-extinguishing grid is broken or damaged, manually debug the accuracy of mechanical interlocking opening and closing, check whether the contact contact contact is good, if necessary, file the contact surface, check whether the internal springs, gaskets, screws are loose, deformed and fall off.

    Under the favorable market demand of low-voltage distribution cabinet in China, the competition within the industry will be intensified. The suppliers who provide the new generation of low-voltage complete sets of equipment and system solutions will gain the first chance in the future market competition. Only by possessing the above characteristics can the products of enterprises win certain advantages in the future competition, thus seizing the commanding heights of the fourth generation of low-voltage electrical products.


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