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High and low voltage complete cabinet suppliers: introduction to common knowledge collection of power distribution cabinets

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A detailed explanation of basic knowledge of high and low-voltage power distribution cabinets refers to a complete set of equipment assembled from primary equipment and secondary equipment according to a certain wiring method and is used to control and protect lines and equipment. According to the voltage level, it can be divided into high and low-voltage power distribution cabinets and low-voltage power distribution cabinets. The high and low-voltage power distribution cabinets use partitions to divide the cabinet into various compartments, mainly divided into a busbar room, circuit breaker room, secondary control room, feeder room, etc. High and low-voltage complete cabinet supplier tells you that the power distribution cabinets can be divided into the following types according to their functions:

Box-type fixed AC metal enclosed switchgear
1. Incoming line cabinet: The high-voltage incoming line cabinet is a high-voltage cabinet that breaks the high-voltage incoming line power supply. In fact, it is not a real incoming line cabinet. The incoming line is generally not connected to this cabinet, but connected to the isolation cabinet. The circuit breaker (vacuum) can break the incoming power supply and is usually equipped with a circuit breaker switch, CT, PT, isolation knife, and other components.
2. Outlet cabinet: also called feeder cabinet and power distribution cabinet, mainly used to distribute electric energy, usually equipped with circuit breaker switch, CT, PT, isolation knife, and other components.
3. Isolation cabinet: It is used to isolate the bus bars at both ends, or to isolate the power receiving equipment and power supply equipment. It can provide a visible terminal for the operating personnel to facilitate maintenance and repair operations. Since the isolation cabinet does not have breaking and connecting capabilities, the handcart of the isolation cabinet cannot be pushed or pulled when the circuit breaker matched with it is closed.
4. Bus connection cabinet: used to connect two sections of the bus. In single-bus sections and double-bus systems, a bus connection is often used to meet the requirements of users to choose different operation modes or to ensure that there is a choice in case of failure. Shedding load.
5. Capacitor cabinet: also called compensation cabinet, it is used to improve the power factor of the power grid, or to make reactive power compensation. The main components are capacitors, switching control circuits, fuses, etc. Warm reminder from suppliers of high and low-voltage complete sets of cabinets. After the capacitor cabinet is powered off from the grid, it will take a while to discharge. Do not directly touch the components in the cabinet with your hands. It takes a few minutes.
6. PT cabinet: Also known as voltage transformer cabinet, it is generally installed directly on the busbar to detect the busbar voltage and realize the protection function, and provide operating power for the electric operating mechanism. According to the voltage transformer PT, isolation knife, fuse and lightning arrester, etc.
7. Metering cabinet: It is mainly used to measure electric energy. It is divided into the high-voltage metering cabinet and the low-voltage metering cabinet. When high-voltage metering is allowed, high-voltage metering should be used as much as possible.
In the switchboards, control boxes, and switch boxes that use electricity, there are switches, circuit breakers, fuses, buttons, indicator lights, meters, wires, and other protective devices assembled into a power distribution device that meets the design function requirements. The equipment is commonly known as low-voltage switchgear or high and low-voltage electrical complete sets of equipment.

Precautions for the use of high and low-voltage power distribution cabinets
1. The principle of power transmission requires us to close the switch first and then the load switch, close the high-voltage switch first, then close the low-voltage switch, close the power switch first, then close the load switch, close the power switch first, and then close the load switch. According to the principle of the load-side switch. The order between each step and each step should not be confused, so as not to cause other problems when we use it. High and low-voltage complete cabinet supplier warmly reminds us that the sequence of power outages is opposite to the above operating guidelines.
2. Before we close the switch, we should check whether the low-voltage main switch, high-voltage switch, branch switches, and matching knife switches are in the closed position. For the closing operation after the equipment maintenance, we should also check whether each circuit is closed. If the grounding wire has not been removed, and some related equipment has been restored to its original state, it must be carefully verified that there is no fault in the wiring before performing the switching operation.
3. Before switching on, it is necessary to carry out check operation according to the power supply circuit of the system diagram and the actual power consumption situation on-site, and make sure the safety arrangement measures and technical measures, and the safety measures are in line with the site practice can be carried out before operation can be carried out. Even if there is a small doubt in the process, it is necessary to figure it out before proceeding. The high-voltage operation should be carried out by two people, one person is responsible for the operation, and the other is responsible for the guardianship.

Working principle of high and low voltage power distribution cabinet
The power distribution cabinet is assembled in a closed or semi-closed metal safe by electrical wiring requirement by switchgear, measuring instrument, protective device, and auxiliary equipment or on-screen width forms low-voltage distribution cabinet. During normal operation, the circuit can be turned on or off by means of a manual or automatic switch. In case of failure or abnormal operation, the circuit can be cut off or alarmed by means of protective electrical appliances. Various parameters in operation can be displayed by measuring the instrument, and some electrical parameters can also be adjusted to prompt or send out signals for deviations from normal working conditions.

What is a high-voltage switchgear?
High-voltage switchgear is a high-voltage power distribution device that will involve primary and secondary equipment according to a certain wiring scheme. It is used to control and protect generators, power transformers, and high-voltage lines in power plants and substations. It is equipped with high-voltage switchgear, protective appliances, inspection and measuring instruments, busbars, insulators, etc. There are two types of high-voltage switchgear: fixed type and handcart type, which are generally used in substations and distribution stations of small and medium-sized factories. Most of them use economical fixed high-voltage cabinets.

What is a low-voltage switchgear?
The low-voltage switchgear is a low-voltage power distribution assembly that involves the complete assembly of low-voltage switchgear according to a certain wiring scheme. It is used for power and lighting distribution in the power supply system below 1000V. Similarly, it also has two types: fixed installation and withdrawable installation.
High and low-voltage complete cabinet supplier tells you that low-voltage distribution cabinets are used for low-voltage power and lighting distribution of AC 50Hz and below 500 in substations, power distribution stations, and various self-contained power stations. At present, there are three types of low-voltage power distribution cabinets produced in my country: double-sided operation fixed type, single-sided operation fixed type, and drawer type. The double-sided operation can be maintained on both sides; single-sided operation can only be maintained on one side, reliable wall installation, and operation and maintenance in front of the cabinet; the drawer type has more circuits, and the faulty unit circuit can be replaced immediately through the spare drawer. Features of rapid restoration of power supply.

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