General situation and Prospect of low voltage circuit breaker in China
2016-08-04
In modern society, whether in industry, agriculture, transportation, national defense, education, finance, commerce, tourism services and people living in areas such as cannot do without electricity. The generation, transmission and use of electricity, distribution is an extremely important link. The distribution system includes transformer and all kinds of high and low voltage electrical equipment, low voltage circuit breaker is a wide range of the use of electrical appliances.
Low voltage circuit breaker, which is from the structure, it uses the feature points, there is universal type (also known as frame, internationally known as ACB) and plastic shell type [internationally known as MCCB, MCB (small)] two categories, their role is the same:
(1) in the normal circumstances, do not frequent, sub circuit or start, stop motor;
(2) in the line or motor overload, short circuit or under voltage (voltage) and other faults, can automatically cut off the circuit, to be protected.
According to the protection of the object, the circuit breaker is divided into four types:
(1) power distribution protection: protection of power supply and electrical circuits (wires, cables) and equipment;
(2) motor protection - not frequent starting, operation of the motor is interrupted, as well as in the motor overload, short circuit and under voltage protection;
(3) the protection of household and similar domestic places - protection of lighting circuits, household appliances, etc.;
(4) the residual current (leakage) protection type: used to protect the body from the danger of electric shock and the protection of electrical fire.
Two, the development of low-voltage circuit breaker in China
Circuit breaker is the world's first appeared in 1885, it is a combination of knife switch and overcurrent tripping device. Born in 1905 with a free air circuit breaker tripping device. Since 1930, with the development of science and technology, the discovery of the principle of arc and the invention of various arc extinguishing devices, and gradually formed the current institutions. At the end of 1950s, the rise of electronic components, and the electronic release, until today, due to the popularity of computer miniaturization, and the advent of intelligent circuit breaker.
There is hardly a circuit breaker before liberation in China. After the founding of new China, the electrical industry has been developing very much. The low-voltage circuit breaker has experienced the development process of the four generation.
(a) universal circuit breaker (ABC)
The first generation is the imitation of Su A15, A2050 DW1, DW2 (rated current of 200 A ~ 1500A); the second generation is to update the DWO foundation in 1958 China's own design on the DW10 series, the rated voltage of AC 380V, DC 440V, rated current of 200 A ~ 4000A; the third generation is at the end of 1970s. At the beginning of 80s, production of DW15 and DWX15 (limiting); the fourth generation is at the beginning of 90s the successful development of DW45 intelligent circuit breaker.
In the early and middle period of 80s, the AH and ME type universal circuit breakers were introduced from Japan and Germany.
DW45 series universal circuit breaker, with international similar products in 90s (F company's ABB series, Schneider Inc's M series and AE series of Japanese Mitsubishi Co) level. It has overload long delay, short time delay, instantaneous three section protection characteristics and single-phase grounding fault protection and current protection, characteristics of the action time is adjustable, display, memory, memory test, thermal fault, load monitoring, self diagnosis, MCR (low multiple short closing protection) communication interface of intelligent functions.
Question on the meaning of several electrical parameters of low voltage electrical apparatus
In recent years, with the deepening of the socialist market economy, the competition of products has become increasingly fierce. Some electric appliance manufacturers in order to promote the sale of products, in their samples or products used in the specification of some of the technical performance parameters do not meet the scientific and standard, which caused confusion. The reason, one is for those who do not really understand the meaning of the parameters; two is the meaning of the parameters is clear, but in order to make the user feel superior products than others, deliberately vague concept to improve their products, regardless of what kind of situation is not serious, irresponsible. In order to clarify the problem, we will according to national and international standard to describe the electrical parameters of the meaning, in order to get.
Rated working voltage
The definition of "rated operating voltage" is defined as: "under the specified conditions, to ensure the normal operation of the electrical work voltage value of GB/T2900.18-92"." Rated working voltage in China and more than and 30 countries in the world is AC 50Hz 220/380V, UK, Australia and other more than and 10 countries is the exchange of 50Hz 240/415V, Bangladesh, India, Malaysia, Pakistan, Singapore, and other countries is the exchange of 50Hz 230/400V. The 127/220V and so on. IEC publication 38, given the voltage too many types, effects of trade and exchange, that the future of the world unified using 230/400V standard voltage (molecular phase voltage, line voltage as the denominator), but this reform involves a great, is a vast engineering system, so the current world is still using the original voltage system. Since it is not possible to appear in the 400V 220/380V working voltage. But there are many manufacturers of breaker samples, its short-circuit breaking capacity of the bar impressively marked the rated voltage of 400V, short-circuit current in the same situation, let users think it is higher than the 380V (if single from a digital watch, a lot of natural high than 380V 400V). This kind of high working voltage is a kind of misunderstanding, if not intentional. Circuit breaker in the short-circuit breaking test and overload operation performance test, the test voltage is 1.05Ue, it is understood that the 1.05X380=400V.
Low voltage circuit breaker, which is from the structure, it uses the feature points, there is universal type (also known as frame, internationally known as ACB) and plastic shell type [internationally known as MCCB, MCB (small)] two categories, their role is the same:
(1) in the normal circumstances, do not frequent, sub circuit or start, stop motor;
(2) in the line or motor overload, short circuit or under voltage (voltage) and other faults, can automatically cut off the circuit, to be protected.
According to the protection of the object, the circuit breaker is divided into four types:
(1) power distribution protection: protection of power supply and electrical circuits (wires, cables) and equipment;
(2) motor protection - not frequent starting, operation of the motor is interrupted, as well as in the motor overload, short circuit and under voltage protection;
(3) the protection of household and similar domestic places - protection of lighting circuits, household appliances, etc.;
(4) the residual current (leakage) protection type: used to protect the body from the danger of electric shock and the protection of electrical fire.
Two, the development of low-voltage circuit breaker in China
Circuit breaker is the world's first appeared in 1885, it is a combination of knife switch and overcurrent tripping device. Born in 1905 with a free air circuit breaker tripping device. Since 1930, with the development of science and technology, the discovery of the principle of arc and the invention of various arc extinguishing devices, and gradually formed the current institutions. At the end of 1950s, the rise of electronic components, and the electronic release, until today, due to the popularity of computer miniaturization, and the advent of intelligent circuit breaker.
There is hardly a circuit breaker before liberation in China. After the founding of new China, the electrical industry has been developing very much. The low-voltage circuit breaker has experienced the development process of the four generation.
(a) universal circuit breaker (ABC)
The first generation is the imitation of Su A15, A2050 DW1, DW2 (rated current of 200 A ~ 1500A); the second generation is to update the DWO foundation in 1958 China's own design on the DW10 series, the rated voltage of AC 380V, DC 440V, rated current of 200 A ~ 4000A; the third generation is at the end of 1970s. At the beginning of 80s, production of DW15 and DWX15 (limiting); the fourth generation is at the beginning of 90s the successful development of DW45 intelligent circuit breaker.
In the early and middle period of 80s, the AH and ME type universal circuit breakers were introduced from Japan and Germany.
DW45 series universal circuit breaker, with international similar products in 90s (F company's ABB series, Schneider Inc's M series and AE series of Japanese Mitsubishi Co) level. It has overload long delay, short time delay, instantaneous three section protection characteristics and single-phase grounding fault protection and current protection, characteristics of the action time is adjustable, display, memory, memory test, thermal fault, load monitoring, self diagnosis, MCR (low multiple short closing protection) communication interface of intelligent functions.
Question on the meaning of several electrical parameters of low voltage electrical apparatus
In recent years, with the deepening of the socialist market economy, the competition of products has become increasingly fierce. Some electric appliance manufacturers in order to promote the sale of products, in their samples or products used in the specification of some of the technical performance parameters do not meet the scientific and standard, which caused confusion. The reason, one is for those who do not really understand the meaning of the parameters; two is the meaning of the parameters is clear, but in order to make the user feel superior products than others, deliberately vague concept to improve their products, regardless of what kind of situation is not serious, irresponsible. In order to clarify the problem, we will according to national and international standard to describe the electrical parameters of the meaning, in order to get.
Rated working voltage
The definition of "rated operating voltage" is defined as: "under the specified conditions, to ensure the normal operation of the electrical work voltage value of GB/T2900.18-92"." Rated working voltage in China and more than and 30 countries in the world is AC 50Hz 220/380V, UK, Australia and other more than and 10 countries is the exchange of 50Hz 240/415V, Bangladesh, India, Malaysia, Pakistan, Singapore, and other countries is the exchange of 50Hz 230/400V. The 127/220V and so on. IEC publication 38, given the voltage too many types, effects of trade and exchange, that the future of the world unified using 230/400V standard voltage (molecular phase voltage, line voltage as the denominator), but this reform involves a great, is a vast engineering system, so the current world is still using the original voltage system. Since it is not possible to appear in the 400V 220/380V working voltage. But there are many manufacturers of breaker samples, its short-circuit breaking capacity of the bar impressively marked the rated voltage of 400V, short-circuit current in the same situation, let users think it is higher than the 380V (if single from a digital watch, a lot of natural high than 380V 400V). This kind of high working voltage is a kind of misunderstanding, if not intentional. Circuit breaker in the short-circuit breaking test and overload operation performance test, the test voltage is 1.05Ue, it is understood that the 1.05X380=400V.
