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Basic introduction of high and low voltage cabinet for power distribution

Release time:

2023/01/10 20:03

To put it bluntly, the high and low voltage cabinet of power distribution equipment is a substation equipment used for distribution, manipulation, accurate measurement and connection of cables in the power supply and distribution system. The general power supply bureau and distribution station apply low-voltage cabinet, and then lead out to the low-voltage cabinet for power distribution equipment through the low-voltage side of the transformer. The low-voltage cabinet for power distribution equipment is located in the power distribution box, control cabinet and distribution box. The internal structure of the power switch, circuit breaker, fuse, button, display lamp, instrument panel, cable and some other protection equipment assembled into a whole, in order to adapt to the design scheme of the role of the provisions. Alias: high and low voltage high voltage switchgear or complete sets of equipment high and low voltage electrical equipment. Second, the efficacy of each distribution box high-voltage incoming cabinet, metering cabinet, high-voltage outgoing cabinet, low-voltage incoming cabinet, capacitance compensation cabinet, low-voltage outgoing cabinet, this distribution box is all commonly used in distribution rooms, high-voltage and low-voltage are all combined according to certain functions. 1. High-voltage incoming cabinet: it is a high-voltage incoming power supply high-voltage cabinet, but in fact it is not a real incoming cabinet. Generally, the incoming line is rejected from this cabinet and connected to the isolation cabinet, but the reason why it is the incoming line cabinet is that it has a circuit breaker (vacuum pump) that can disconnect the incoming line switching power supply. 2. Metering cabinet: to put it bluntly, it is used to install electricity meters and accurately measure and check what electric energy wooden cabinet you have used. Except for pt and CT, the equipment cabinet has no other key components. 3. High-voltage outgoing cabinet: its role is to distribute and transport electromagnetic energy. He usually takes the transformer or high-voltage electrical equipment (motor) and high-voltage compensation facilities. 4. Low-voltage incoming cabinet: generally, it is a cabinet from the transformer, also called a low main cabinet, which is used to operate each electrical equipment below. The main power switch generally adopts frame circuit breaker. 5. Capacitance compensation cabinet: its role is to compensate for power quality analysis, power factor compensation! 6. Low voltage outlet cabinet: its function is to distribute and transport electromagnetic energy. It is not like high voltage, most of which can be directly connected to electrical equipment, and the power switch generally uses molded case circuit breakers. The choice of 3. low-voltage cabinet The choice of low-voltage cabinet includes the choice of vertical type (mobile type or used car type), the choice of series products of low-voltage cabinet (including the choice of low-oil circuit breaker or vacuum pump circuit breaker type), and the choice of high-voltage electrical appliances. 1. Selection of low-voltage cabinet category The Communications Administration (station) should take domestic products (domestic or joint ventures) as the leading factor in product selection, and stipulate that the technology is leading, the quality is stable, the operation, the maintenance is convenient, and the size is small. 2. At this stage, there are two main types of waterproof grades for low-voltage cabinets:(1)IP3X: prevent solid dirt with an aperture of more than 2.5mm from entering the network cabinet. (2)IP4X: Avoid solid dirt with an aperture of more than 1mm from entering the network cabinet. The basic requirement of low-voltage household appliances is to ensure the normal operation or failure of electrical equipment. The rated current and rated voltage of electrical appliances must meet the requirements of the power supply system. 4. The selection of low-voltage circuit breakers The basic parameters of low-voltage circuit breakers are rated current and rated voltage. The rated current of the circuit breaker is not less than the working voltage of the device, and the very important main parameters are the rated short-circuit fault breaking current Id,max and the rated short-circuit fault reclosing current.

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Common Problems of High and Low Voltage Distribution Cabinet