Breaker, English name circuit-breaker, as the name suggests is a device that can cut off the current, Baidu's definition of circuit breaker is a kind of current that can close, load and break the normal loop conditions, and can be closed, in A switching device that carries and breaks the current under abnormal loop conditions (including short circuit conditions) for a specified period of time.
The world's oldest circuit breaker was produced in 1885. It is a combination of a knife opening and an overcurrent release. In 1905, an air circuit breaker with a free tripping device was born. Since 1930, with the advancement of science and technology, the discovery of the arc principle and the invention of various arc extinguishing devices have gradually formed the current mechanism. At the end of the 1950s, due to the rise of electronic components, electronic release devices were created. Today, thanks to the popularity of single-chip microcomputers, intelligent circuit breakers have been introduced.
Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. High-voltage circuit breakers are the main power control equipment for power plants and substations, and have arc extinguishing characteristics. When the system is in normal operation, it can cut off and connect lines. As well as a variety of electrical equipment, no-load and load current; when the system fails, it cooperates with relay protection, can quickly cut off the fault current to prevent the expansion of the scope of the accident. Therefore, the work of high-voltage circuit breakers directly affects the safe operation of the power system.
Low-voltage circuit breakers, also known as automatic switches, are appliances that have both manual switching and automatic voltage loss, undervoltage, overload, and short circuit protection. It can be used to distribute electrical energy, starting asynchronous motors infrequently, and protecting the power lines and motors. When they are severely overloaded or short-circuited and under-voltage faults, they can automatically cut off the circuit. Their functions are equivalent to fuse-type switches and Overheating relays and other combinations. And after breaking the fault current does not generally need to change parts, now our daily life home "air switch" is a low-voltage circuit breaker, the role is actually the fuse we used before, the fuse's melting point is relatively low, when When the current in the circuit is too large, the fuse will blow, thus breaking the circuit to prevent hazards. However, once the fuse is blown, it must be replaced. The low-voltage circuit breaker functions like a fuse, but can be used repeatedly, and the air switch can be opened only Then close the switch.
At present, the relatively good circuit breaker brands in foreign countries include Schneider, Siemens, ABB, etc., domestic Zhengtai, Delixi, etc. In the past ten years, China's air circuit breaker manufacturing industry has been greatly developed. The number, grade, and quality of products can basically meet the needs of the domestic low-voltage power grid. However, there are many problems in the industry: too many manufacturers, low prices Competition directly affects the quality of products and the development of the industry; serious outflow of skilled personnel, development capacity decline; lack of sufficient funds to carry out research on new processes, new materials, new equipment, so that the lack of business development stamina; research institutes of enterprises. The lack of research funds directly affects the speed of product replacement. For the future development of the industry, domestic manufacturers should make adjustments in the following aspects: First, the reliability of products should be given top priority. Whether it is in production or in research and development, it is necessary to continuously study new technologies and narrow down international technologies. The gap, at the same time, can not be one-sided pursuit of high indicators, to use the status quo in combination with the domestic, thereby reducing costs and improve competitiveness, in fact, foreign brands are also based on the use of the domestic market to launch products suitable for the Chinese market. For the industry as a whole, effective integration is also a necessary measure to increase the competitiveness of domestic brands. It is of great benefit for forming economies of scale, improving product quality, and preventing vicious competition.
The world's oldest circuit breaker was produced in 1885. It is a combination of a knife opening and an overcurrent release. In 1905, an air circuit breaker with a free tripping device was born. Since 1930, with the advancement of science and technology, the discovery of the arc principle and the invention of various arc extinguishing devices have gradually formed the current mechanism. At the end of the 1950s, due to the rise of electronic components, electronic release devices were created. Today, thanks to the popularity of single-chip microcomputers, intelligent circuit breakers have been introduced.
Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. High-voltage circuit breakers are the main power control equipment for power plants and substations, and have arc extinguishing characteristics. When the system is in normal operation, it can cut off and connect lines. As well as a variety of electrical equipment, no-load and load current; when the system fails, it cooperates with relay protection, can quickly cut off the fault current to prevent the expansion of the scope of the accident. Therefore, the work of high-voltage circuit breakers directly affects the safe operation of the power system.
Low-voltage circuit breakers, also known as automatic switches, are appliances that have both manual switching and automatic voltage loss, undervoltage, overload, and short circuit protection. It can be used to distribute electrical energy, starting asynchronous motors infrequently, and protecting the power lines and motors. When they are severely overloaded or short-circuited and under-voltage faults, they can automatically cut off the circuit. Their functions are equivalent to fuse-type switches and Overheating relays and other combinations. And after breaking the fault current does not generally need to change parts, now our daily life home "air switch" is a low-voltage circuit breaker, the role is actually the fuse we used before, the fuse's melting point is relatively low, when When the current in the circuit is too large, the fuse will blow, thus breaking the circuit to prevent hazards. However, once the fuse is blown, it must be replaced. The low-voltage circuit breaker functions like a fuse, but can be used repeatedly, and the air switch can be opened only Then close the switch.
At present, the relatively good circuit breaker brands in foreign countries include Schneider, Siemens, ABB, etc., domestic Zhengtai, Delixi, etc. In the past ten years, China's air circuit breaker manufacturing industry has been greatly developed. The number, grade, and quality of products can basically meet the needs of the domestic low-voltage power grid. However, there are many problems in the industry: too many manufacturers, low prices Competition directly affects the quality of products and the development of the industry; serious outflow of skilled personnel, development capacity decline; lack of sufficient funds to carry out research on new processes, new materials, new equipment, so that the lack of business development stamina; research institutes of enterprises. The lack of research funds directly affects the speed of product replacement. For the future development of the industry, domestic manufacturers should make adjustments in the following aspects: First, the reliability of products should be given top priority. Whether it is in production or in research and development, it is necessary to continuously study new technologies and narrow down international technologies. The gap, at the same time, can not be one-sided pursuit of high indicators, to use the status quo in combination with the domestic, thereby reducing costs and improve competitiveness, in fact, foreign brands are also based on the use of the domestic market to launch products suitable for the Chinese market. For the industry as a whole, effective integration is also a necessary measure to increase the competitiveness of domestic brands. It is of great benefit for forming economies of scale, improving product quality, and preventing vicious competition.
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