Industry News | 2025.06.12

A Brief Discussion on Maintenance Methods for Low Voltage Complete Equipment Cabinets.

A Brief Discussion on Maintenance Methods for Low Voltage Complete Equipment Cabinets. Maintenance methods for low-voltage complete equipment cabinets:

Everything has its own lifespan, and humans have their own lives. The same applies to other things, including machinery. The controller of the high-voltage distribution cabinet calculates the active power, reactive power, and required compensation capacity based on the collected voltage and current. The controller automatically switches on and off according to the set filtering and compensation branch data.

But if we want to fully utilize the service life of the machinery, we must pay attention to the maintenance of the machinery. Mechanical maintenance is also the most effective guarantee for extending or ensuring the use of machinery. The maintenance of low-voltage distribution cabinets is mainly to ensure the normal and safe operation of low-voltage distribution cabinets. The maintenance of low-voltage complete distribution cabinets involves many aspects and contents. Today, the manufacturers of high and low voltage distribution cabinets will mainly explain the maintenance knowledge of low-voltage complete distribution cabinets.

The maintenance of low-voltage complete distribution cabinets is an essential step to ensure the normal use of electrical cabinets at all times, mainly including the maintenance of transformers, drawer switches, capacitor cabinets, circuit breakers in power receiving cabinets and contact cabinets, and so on. The capacitor switching device for landscape type buried substations can be composed of controllable silicon load switches or capacitor specific switching contactors. Thyristors are contactless switching devices, and when the voltage points at both ends are zero (equipotential), they are connected to the filtering branch. Cut off the filtering branch when the current crosses zero. During the switching process, there is no transient impact on the power grid and no surge impact when closing.

During the maintenance process, the first step is to cut off the power supply to the distribution cabinet, which is the most important point. The complete set of power distribution equipment is supplied by the manufacturing plant and assembled into a power distribution device after being transported to the site. It divides the main electrical circuit into several units, each unit is a circuit, and the circuit breakers, knife switches, current transformers, voltage transformers, as well as protection, control, measurement and other equipment of each unit are assembled in a whole cabinet. The power device composed of multiple high-voltage switchgear installed in power plants, substations or distribution stations is called a complete distribution device. Next, the maintenance of the transformer should start from the low-voltage side of the transformer, checking whether the busbar and down lead connections are good, whether the joint points have heat and discoloration, whether the cable heads and wiring pile heads are firm and reliable, whether the grounding wire is corroded, and whether the wiring pile heads are tightened. All secondary circuit wiring connections are reliable and the insulation meets the requirements. When inspecting the capacitor cabinet, disconnect the main switch of the capacitor cabinet, discharge the capacitors to ground one by one with a wire of more than 10mm2, and visually inspect the shell for good condition and no oil leakage. If the capacitor shell expands, it should be dealt with in a timely manner, and the discharge device, control circuit wiring screws, and grounding device should be replaced. After closing, debug the indicator and automatic compensation parts. When repairing the circuit breakers in the power receiving cabinet and contact cabinet, attention should also be paid to re tightening the wiring screws and checking whether the elasticity of the blade meets the regulations. Check if the arc extinguishing barrier is broken or damaged, manually adjust the mechanical interlock for accurate opening and closing, check if the contact is in good contact, file the contact surface if necessary, and inspect the internal springs, washers, and screws for looseness, deformation, and detachment.

During the inspection process, it is important not to carry out maintenance alone and to have someone nearby to supervise. Before starting work, be sure to cut off the power; A detailed understanding of the working principle is necessary for hands-on operation.

How to maintain high and low voltage switchgear.~~Prve~~ Power distribution boxes are classified according to structural characteristics and purposes.~~Next~~

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