As the name suggests, the high-voltage and low-voltage distribution cabinet is the distribution equipment connecting the high-voltage distribution cabinet, low-voltage switchgear and connecting cables. Generally, the power supply bureau and substation use the high-voltage distribution cabinet, and then depressurize through the transformer to the low-voltage switchgear. The low-voltage switchgear is connected to each power distribution panel, control box and switch box, which is nothing more than some switches, circuit breakers, fuses Button, indicator light, instrument, wire and other protective devices are assembled into an integrated power distribution equipment. Today, Hengsheng distribution box gives you a detailed explanation: the design, assembly and installation of high and low voltage distribution cabinet.

In recent years, urban industrial power consumption, commercial power consumption, residential power consumption, urban and even rural power consumption have increased significantly. According to relevant data, the power consumption in urban residential areas has increased by about 5 times, and there is a trend of continuous growth. The power load of commercial and hotel buildings is greater. According to statistics, the power load of a high-rise building can reach 8 ~ 10 MW or even 20 MW, so it is imperative to improve the transformer capacity, Therefore, it is also necessary to develop new low-voltage switchgear with large capacity and high performance. On the other hand, the increase of ring network power supply mode increases the short-circuit current at the fault point accordingly. Therefore, low-voltage switchgear with high breaking capacity is required. With the development of power supply reliability and distribution automation, low-voltage switchgear is required to have the "four remote" functions of remote control, telemetry, remote signaling and remote regulation, And high reliability and safety  

Low voltage frame circuit breaker

Since the late 1980s and early 1990s, China has introduced and developed several new circuit breakers, among which the more typical ones are AE type (produced by Mitsubishi company), ah type (produced by sizaki company), 3We type (produced by Siemens company), me type (produced by AEG company) and DW15 type (produced by China). In the 1990s, China developed DW45 circuit breaker, and several intelligent devices have also been developed in China, Among them, the more representative is the intelligent device produced by a factory in Jiangsu. The domestic AE switch and domestic DW45 switch are equipped with this intelligent device. At present, the AE switch produced by Guangzhou Nanyang Electric Appliance Factory is a product produced by introducing the technology of Mitsubishi company in the 1980s. After the introduction of technology, after localization and self-development, it has been able to achieve the rated current of 3200 a, With a rated short-circuit breaking current of 65 Ka and an intelligent device developed by China, an intelligent frame circuit breaker which can realize two-way communication with computer is formed, which is at the advanced level in China

Low voltage vacuum circuit breaker

At present, most of the circuit breakers using vacuum arc extinguishing mode are used in the medium voltage field. Because the vacuum arc extinguishing mode seals the arc in the vacuum bubble without exposure, the main contact does not need maintenance, has long service life, safe and reliable use and relatively simple operating mechanism. In view of these advantages, Now, the vacuum interrupter has been developed to be used in the low-voltage field. Guangzhou Nanyang Electric Appliance Factory and Shanghai Electric Power Research Institute have jointly developed the low-voltage vacuum circuit breaker, with a rated current of 1600 a, a rated short-circuit breaking current of 50 Ka and 20 short-circuit breaking times. Moreover, the intelligent release is adopted to realize two-way communication with the computer, It can be used in harsh environment or high requirements; When the price is reduced, it can be used in general environment because of its long service life, safety and reliability