Analysis of Development Space and Trend of High and Low Voltage Distribution Cabinet

     Many people say that the development of high and low voltage distribution cabinet is now facing a bottleneck. In fact, the high and low voltage distribution cabinet still has a lot of room for development. The following sets of electrical detailed analysis of this development space and trend of high and low voltage distribution cabinet.

     China's transformer industry started much later than developed countries. In the early years of the founding of New China, the development of China's transformer industry was very slow. The production capacity of enterprises was not enough. The domestic demand needed to be solved by importing. After the reform and opening up, due to the introduction of the market competition mechanism, all the transformer enterprises actively carried out institutional reforms to adapt to the market economy. China's transformer industry has witnessed rapid development. However, due to the market economy to adapt to the need for a certain period of time and process, many domestic transformer manufacturers therefore slowed the pace of new products, new technology research and development, personnel training can not keep up, China's development of transformer enterprises is very limited.

     From the current development of China's transformer industry status quo, China's transformer industry size is relatively large, capacity also increased a lot more than in the past. However, China's transformers are still not competitive enough with large foreign enterprises in the market. Moreover, the mixed use of the transformer industry, poor supervision, the market shoddy phenomenon from time to time, disrupting the market competition, but also greatly damaged the image of China's transformer industry.

     A power distribution cabinet, sometimes referred to as a distribution box, is an integrated electrical component for power distribution: air switches, circuit breakers, various types of knives, terminals, protective equipment (thermal relays, time relays, Fuses and the like, advanced protection devices, etc.), measuring equipment (voltmeter, ammeter, frequency meter, power meter, etc., as well as transformers and various sensors).

     Power distribution cabinets are widely used in distribution control of residential electricity, residential buildings, schools and hospitals because of their good functions. Some people may ask, then why do we usually do not see the power distribution cabinets? Because some of the power distribution cabinets are small, most of them are darkly set in the wall, the larger are concentrated in the power distribution room, So rarely seen in everyday life distribution cabinet. In the enterprise plant and workshop will often see the power distribution cabinets, or distribution boxes, such as lighting distribution cabinets and power distribution cabinets. In general, power distribution cabinets are divided into primary, secondary and tertiary distribution equipment.

     Power distribution cabinet has two main functions: First, the power distribution equipment and control, and second, the circuit overload, short circuit and leakage, to provide power protection, when the circuit fails, is conducive to control the fault range It is also convenient and quick to identify the fault point in time to be ruled out, without a large power outage. In addition, the power distribution cabinet for the convenience of placing a variety of protective equipment, such as to prevent short circuit fuses (fuses), to prevent overload of the air switch, etc., can play a protective role in the line and electrical equipment. That is to put things together to facilitate the maintenance and inspection. Especially in the case of large power consumption today, it is not feasible to have a power distribution cabinet, which greatly helps to improve the convenience of using electricity.

     Power distribution cabinet structure is complex, the output circuit capacity is relatively large, it is the power distribution system power supply center, will be installed in the substation, is responsible for the distribution of electricity to the two distribution counters. Distribution cabinet is divided into power distribution cabinets and motor control center, the application of the opposite parts of the two, power distribution cabinets mainly in the loop less scattered parts, and the motor control center used in the loop and more concentrated areas. It is mainly to undertake a distribution cabinet distribution of electrical energy, and assigned to the nearest load. Distribution cabinet is mainly lighting distribution cabinet and power distribution cabinet, their capacity is relatively small, the layout is also more dispersed, mainly responsible for controlling the lowest level of load distribution.

     The safe use of high and low voltage distribution cabinet has always been the focus of attention, the following precautions need to understand. Work on fully and partially energized trays should be clearly marked with service equipment and operating equipment. When working on the secondary circuit of the current transformer, it is forbidden to disconnect the current loop. In order to reliably short-circuit the secondary coil of the current transformer, short-circuits and short-circuits must be used, and the use of a wire must not be used. Do not perform any work on the circuits and conductors between the current transformer and the short-circuit terminals. Before the secondary circuit is energized or withstanding voltage test, the attendant and relevant personnel should be informed and dispatched to the guarded site to check the circuit to confirm that no one is working before pressurizing. Check the power failure protection box secondary circuit staff, without the permission of duty personnel, are not allowed to perform any switching operation.

     However, high and low voltage distribution cabinet installation, acceptance, handover test commissioning, operation and maintenance should comply with the requirements of the power sector requirements. Should also note the following: The user should be carefully checked when receiving the relevant provisions of the product does not immediately installed, should be used under normal conditions of use, stored in the appropriate place. Products should be used to lift the bottom of a special spreader. The product level is placed on the basis of doing well in advance, installed four anchor bolts (secondary watering method), and then the gap between the product base and the foundation with cement mortar to prevent rainwater from entering the cable room. Through the high and low pressure chamber bottom plate access high and low voltage cables. The gap between the cable and the pipe is sealed and waterproof.

     High-voltage distribution cabinet high-voltage side Whether it is the use of overhead lines or cable into the line, should be set near the transformer substation line into the obvious visible fracture (such as drop-type fuses, etc.). To the maintenance staff clearly shows the substation is charged. To ensure the safety of maintenance personnel. After the product is installed, it should be well grounded: two main grounding terminals, transformer neutral point and shell under the channel of the power station base and the pile head under arrester shall be grounded separately by the installation department. Grounding should be shared with a group of grounding devices, the grounding resistance should be less than 4 ohms, leading from the grounding grid to the product of the ground lead should be not less than two. In the operation of the voltage transformer secondary circuit to work strictly to prevent short circuit or ground, should use insulated tools, wear insulated gloves, if necessary, disable the relay protection device before work. When the temporary load, must be equipped with a dedicated switch and fuse.