Low voltage distribution box selection and mainten

2022-07-22
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As the name suggests, low-voltage distribution box is the distribution equipment used for power distribution, control, measurement and connecting cables in the power supply system. Generally, power supply bureaus and substations use high-voltage switchgear, which is then led out to the low-voltage distribution cabinet through the low-voltage side of the transformer. The low-voltage distribution cabinet is connected to the distribution boards, control boxes and switch boxes of each power consumption. Inside, some switches, circuit breakers, fuses, buttons The protective devices such as indicator lights, meters and wires are assembled into a power distribution device that meets the design functional requirements

as the name suggests, low-voltage distribution box is the distribution equipment used for power distribution, control, measurement and connecting cables in the power supply system. Generally, power supply bureaus and substations use high-voltage switchgear, which is then led out to the low-voltage distribution cabinet through the low-voltage side of the transformer. The low-voltage distribution cabinet is connected to the distribution boards, control boxes and switch boxes of each power consumption. Inside, some switches, circuit breakers, fuses, buttons The protective devices such as indicator lights, meters and wires are assembled into a power distribution device that meets the design functional requirements. Next, the editor will introduce the purchase and maintenance of low-voltage distribution boxes

purchase of low-voltage distribution box

1. At present, the distribution box in the market mainly includes metal shell and plastic shell, and the structure includes concealed type and exposed type. Therefore, when selecting, select according to actual needs. No matter which type of distribution box is selected, its box must be intact

2. The wiring busbar in the distribution box should be set with change, protective grounding wire and phase wire respectively, and should be intact and have good insulation performance to ensure the safety of daily use

3. The mounting bracket of the air switch should be smooth and have enough space; The door panel of the distribution box shall have a transparent window for inspection

maintenance method of low-voltage distribution box

1. Maintenance should start from the low-voltage side of the transformer. After the power supply of the distribution cabinet is cut off, clean the dust in the cabinet, check whether the bus and down lead are well connected, whether the joint point is heated and discolored, check whether the cable head and wiring pile head are firm and reliable, check whether the grounding wire is rusted, and whether the wiring pile head is fastened. All secondary circuit connections are reliable and the insulation meets the requirements

2. When checking the drawer type switch, the drawer type 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 wiring screws are fastened. Remove the dirt on and around the contact surface of the contactor, and check whether the contact of the contactor is in good condition. If the contact is in bad contact, slightly file the contact surface if necessary. If the contact is seriously ablated (the contact point is worn to 1/3 of the original thickness), replace the contact. The power indicating instrument and indicator light are in good condition

3. When repairing the capacitor cabinet, disconnect the main switch of the capacitor cabinet first, and discharge the capacitors to the ground one by one with a wire of more than 10mm2. After the appearance inspection, the shell is in good condition without oil leakage. If the capacitor shell expands, it should be handled in time, and the discharge device, the wiring screws of the control circuit and the grounding device should be replaced. After switching on, carry out the commissioning of the indicating part and the automatic compensation part

4. Maintenance of circuit breaker in power receiving cabinet and liaison cabinet: disconnect all loads first, and then shake out the circuit breaker with a handle. Retighten the wiring screws and check whether the elasticity of the knife edge meets the requirements. Check whether the arc extinguishing grid is broken or damaged, whether the opening and closing of mechanical interlock are accurate by manual commissioning, whether the contact is in good contact, file the contact surface if necessary, and check whether the internal spring, gasket and screw are loose, deformed and fall off

working principle of low-voltage distribution box

distribution box is to assemble switchgear, measuring instruments, protective appliances and auxiliary equipment in closed or semi closed metal cabinets or panels according to the requirements of electric lighting and gas wiring to form a low-voltage distribution box. During normal operation of the distribution box, the circuit can be connected or disconnected with the help of manual or automatic switches; In case of fault or abnormal operation, the circuit can be cut off or an alarm can be given with the help of protective appliances. The measuring instrument can display various parameters in operation, adjust some electrical parameters, and prompt or send signals for deviation from the normal working state

main types of low-voltage distribution box

gcs: 8MF steel is used, 20mm, 100mm, 9.2mm mounting holes are on the side, and there are bus room, unit room and cable room GCS type low-voltage distribution box, and each room functions independently. GCK: its low-voltage distribution box structure is assembled and fixed with bolts. MNS: its structure is composed of C-type materials. The so-called C-type is made of steel with 25mm as the module of the installation hole, which is formed by bending. PGL: the traditional low-voltage distribution box is welded with angle steel and steel plate. There is a door in front and an instrument panel above, which can be set with instruments

editor's summary: This is the introduction to the purchase and maintenance of low-voltage distribution boxes. I hope it will be helpful to you. If you want to know more about it, you can pay attention to the information

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