The low-voltage distribution box, as its name suggests, is a power distribution system used for power distribution, control, metering, and connecting cables in power supply systems. The general power supply bureaus and substations use high-voltage switchgear cabinets, and then they are led through the transformer's step-down low-voltage side. To the low-voltage power distribution cabinets, the low-voltage power distribution cabinets are used to install switchboards, circuit breakers, fuses, buttons, indicator lights, meters, wires, and other protective devices, such as power distribution boards, control boxes, and switch boxes. Equipment that meets the design requirements of the power distribution equipment. Next Xiaobian introduced low-voltage distribution boxes and low-voltage distribution box maintenance methods for everyone.
Low voltage distribution box purchase
1. Currently, the distribution box on the market mainly consists of two kinds of metal shells and plastic shells. There are two kinds of concealed and surface mounted structures on the structure. Therefore, when selecting, choose according to actual needs, no matter which type is selected. Electric box, its box must be intact.
2. The wiring busbars in the distribution box should be set up for change, protection grounding, and phase lines, respectively, and should be intact and have good insulation properties to ensure daily use safety.
3. The mounting bracket for the air switch should be clean and free of space; there should be a transparent window for the distribution box door.
Low voltage distribution box maintenance method
1, the repair should start from the low voltage side of the transformer. After the power supply cabinet is powered off, clean the dust in the cabinet, check the connection between the busbar and the down conductor, check whether there is heat discoloration at the connector, check whether the cable head and the wiring pile head are firm and reliable, and check whether the ground wire is rusty or not. Is it fastened? All secondary circuit wiring connections are reliable and the insulation meets requirements.
2. When inspecting the drawer switch, the drawer switch cabinet should be flexible when pushing in or out, and the mechanical locking is reliable. Check whether the automatic air switch operating mechanism on the chest of drawers is in place and whether the connection screws are tight. Remove dirt from the contactor surface and all around the contactor. Check if the contact of the contactor is in good contact. If the contactor is in poor contact, repair the contact surface slightly if necessary. If the contact is severely ablated (the contact point is worn out to the original Thickness of 1/3) should replace the contact. The power indicator and indicator light are intact.
3, when overhauling the capacitor cabinet, it is necessary to disconnect the capacitor cabinet main switch, and discharge the capacitor one by one with a wire of more than 10mm2. After the discharge, the appearance inspection shell is good, no leakage oil phenomenon, if the capacitor shell expansion, should Timely handling, replacement of discharge devices, control circuit wiring screws and grounding devices. The commissioning of the indicating part and the automatic compensation part is performed after closing.
4. Check the circuit breaker in the power receiving cabinet and the connecting cabinet: After disconnecting all the loads, use the handle to shake out the circuit breaker. Re-tighten the wiring screw and check that the blade's elasticity is in compliance with the regulations. Whether the arc extinguishing grid is broken or damaged, manually check whether the mechanical interlocking switch is accurate, check whether the contact is good, if necessary, repair the surface of the contact and check whether the internal spring, gasket, and screws are loose, deformed and dropped off. .
Low voltage distribution box working principle
The distribution box is to assemble switchgear, measuring instruments, protective electrical appliances and auxiliary equipment in closed or semi-enclosed metal cabinets or screen panels according to the requirements of electrical lighting connection, and constitute a low-voltage distribution box. When the distribution box is in normal operation, the circuit can be switched on or off by means of a manual or automatic switch; when a failure or abnormal operation occurs, the protection circuit can be used to cut off the circuit or alarm. Measurement instruments can be used to display various parameters in operation, and certain electrical parameters can also be adjusted to indicate or signal deviations from normal operating conditions.
Low voltage distribution box main types
GCS: The 8MF steel is used. The side has 20mm, 100mm, 9.2mm mounting holes. There are busbar room, unit room and cable room GCS low voltage distribution box. Each room has independent function. GCK: Its low-voltage distribution box structure is a combination of equipment, with bolts to stabilize. MNS: The structure is made of a combination of C-type materials. The so-called C-type is a 25mm-modular mounting hole made of steel material, and is formed by bending. PGL: The low-voltage distribution box traditionally used is made of angle steel and steel plates. There is a door in front and an instrument panel above it.
Editor's summary: About the low-voltage distribution box purchase and low-voltage distribution box maintenance methods are introduced here, I hope to be helpful to everyone. If you want to know more related information, you can pay attention to this website information.
Distribution box low voltage distribution box
Measuring Tape,Small Tape Measure,Custom Tape Measure,Personalized Tape Measure
SHANGQIU CHAOYUE MEASURING TOOLS CO., LTD , https://www.chaoyuetools.com