What are the applications of air circuit breaker

The air circuit breaker (ACB) is a new type of surge protector, which is mainly used in the low-voltage power supply system of power generation enterprises and electricity consumers. Installed in low-voltage incoming cabinets, power cabinets, power distribution cabinets, rectifier cabinets, power distribution boxes, and lighting boxes to protect electrical equipment from damage caused by lightning strikes and operating overvoltage intrusion, limit atmospheric overvoltage, and break caused by various switches Overvoltage and various operating overvoltages

Photovoltaic system and signal air circuit breakers are suitable for various DC power supply systems, such as photovoltaic power generation systems, background broadcasting systems, communication systems, security monitoring systems, etc., industrial control systems and other DC power supply equipment. Protect the equipment power supply system from lightning overvoltage and operating overvoltage.

Scope of application of different equipment:

Bkpd-a25/50kA series surge is suitable for outdoor power distribution control of low-voltage main incoming cabinets of various buildings and power-level lightning protection system risk of high lightning level.

Bkpd-b60/80/100/150/200kA series power surge is suitable for AC 50Hz/60Hz, 380V/420v power supply system, and can be used as low-voltage power distribution cabinet, capacitor cabinet, electric control cabinet, lightning protection (overvoltage) protection. The maximum discharge current of the secondary lightning protection system for electrical control and high lightning risk is 200kA.

Bkpd-c40ka series surge protector is suitable for AC 50Hz/60Hz, 220/380V/420v power supply system, and can be used for lightning protection of power distribution in buildings, such as low-voltage switch cabinet drawers, high-rise building floor power distribution cabinets, and civil building units Power distribution cabinet, etc.

Bkpd-d10/25kA series surge protection is suitable for lightning or overvoltage protection of terminal electrical equipment in AC 50Hz/60h1z, 220/380V/420v power supply systems such as information networks, intelligent equipment, floor distribution cabinets, and civil buildings. The maximum discharge current is 25kA.

Bkpd-a25/a50ka, b60-b150ka series surges are suitable for AC 50Hz/60h1z and 690V general purpose circuit breakers for lightning overvoltage and operating overvoltage protection in smelting and wind power generation systems.

The product specifications, models, product standards and technical requirements for universal circuit breakers on the product certification certificates that our company has passed:

Specifications and models: YUW3-1600/3P YUW3-1600/4P; Ue: AC400V/690V; Ui: 1000V; Uimp: 12kV;

In: 200A 400A 630A 800A 1000A 1250A 1600A; Overcurrent release type: Electronic; AC400V: Ics=55kA

Icu=65kA; Icw=50kA/is; AC690V: Ics=42kA; Icu=50kA; Icw=42kA/1s;

Number of poles: 3P, 4P products are suitable for isolation;

Product standards and technical requirements: GB/T 1404832-2020

Our company has jointly participated in the formulation of GB/T national standards for products such as dual power automatic switch and ACB. GB/T recommended national standard (GB/T), GB is the Chinese pinyin abbreviation of national "standard", and "T" is the recommended national standard. The recommended national standard refers to the standard for self-use through adjustment by economic means in terms of production, exchange, use, etc., and the standard for self-use.

The relationship between vacuum degree and potential of air circuit breaker

The method of accurately measuring the vacuum degree according to the potential of the shield is a key research content in the online monitoring method of the vacuum degree of the air circuit breaker. However, at this stage, there is no easy-to-use high-vacuum detection system based on this method. In order to further study the relationship between the potential of the isolation switch shield and the degree of vacuum, this paper uses the relationship between the relative relative permittivity and the gas pressure created by the Ke-Mo equations, according to the finite element special tool for different gases. Two-dimensional electric field analysis of air circuit breakers under pressure.

The results show that the potential of the shielding cover has a certain corresponding relationship with the degree of vacuum, and can be reflected according to the accurate measurement of the electric field potential of the air circuit breaker; the change of the electric field potential of the air circuit breaker is very weak when the gas pressure is lower than 10-2Pa , and the potential changes significantly when it exceeds 10-2Pa. The accuracy of the results is further verified by accurate measurement experiments based on laboratory simulations. The analysis results in this paper show the regularity of the change of the electric field potential of the vacuum circuit breaker with the degree of vacuum, which has a certain guiding effect on the automatic measurement of the vacuum degree of the vacuum circuit breaker according to the potential method of the shield.

Air circuit breaker is a kind of power switch equipment that relies on the excellent arc extinguishing characteristics of the vacuum pump to complete the breaking of large currents. Compared with the traditional air leakage switch and oil power switch, the v air circuit breaker has the advantages of reliable breaking, low equipment failure rate, less maintenance and compact structure, which makes it gradually used in power transmission and transformation system software, especially It is widely used in the high voltage industry.

As a power switch with a vacuum pump as the arc-extinguishing environment, the degree of vacuum in the air circuit breaker is one of its key parameters. As everyone knows, due to the existence of outgassing of internal components, leaks from sealing ports and gas leakage of sealing components, the internal vacuum degree of the vacuum circuit breaker in operation will decrease with the change of working hours. When the degree of vacuum is reduced to a certain level, its breaking characteristics will not be guaranteed, which will not only lead to the destruction of its own machinery and equipment, but also likely to cause common failures in the entire power grid. Therefore, it seems necessary to check the vacuum degree of the vacuum circuit breaker. The inspection methods of vacuum degree of vacuum circuit breaker are divided into offline inspection and online monitoring. Online monitoring has been favored by everyone because of its simple operation, less labor, and good practicability.