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Introduction to permanent magnet vacuum circuit breaker

2022-12-15

2022-12-15

The operation mechanism of the circuit breaker used an electromagnetic mechanism, and then improved to the spring mechanism. The circuit breaker products currently used in the power market are still the spring mechanism. However, in recent years, the birth and continuous promotion of a new technology operation mechanism are gradually increasing the failure rate of circuit breakers, and the reliability and durability are greatly improved. It is the permanent magnet institution.

The permanent magnet vacuum circuit breaker adopts a new high-reliable permanent magnetic operation. There is only one main motion component during this structure, no mechanical prolapse, locking device, less faulty sources, high reliability, and long service life, generally more than 100,000 times. Control, thereby reducing the impact of overvoltage and surging flow on the system, and improving the overall life expectancy of the system.


In fact, like other electric equipment, permanent magnetic vacuum circuit breakers have long entered China from abroad. As early as the late 1990s, the vacuum circuit breaker of the permanent magnet mechanism was introduced to our country. Vacuum -proof was first studied by Britain and the United States, and then developed to other countries such as Japan, Germany and the former Soviet Union. In China, my country has begun to study the theory of vacuum breakfires since 1959. By the early 1970s, various types of vacuum circuit breakers were officially produced. The continuous innovation and improvement of the vacuum arc extinguishing room, operational mechanism, and insulation level of manufacturing technology has made the development of real vacuum cutters extremely rapid, and has achieved a series of major results in large -capacity, miniaturization, intelligence and reliability research. The vacuum circuit breaker has the advantages of good arc extinguishing characteristics, suitable for frequent operations, long electrical life, high operating reliability, and long non-maintenance cycle. Get a wide range of applications. From the past ZN1-ZN5 varieties to dozens of models and varieties, the rated current has reached 4000A, the turnover current reaches 50KA, and even has 63kA, and the voltage has reached 35kV level. The ZW32-12 permanent magnet vacuum coincidence is composed of a unique design permanent magnet mechanism and a high-reliability MGK intelligent controller. This device is mainly used in the medium-voltage air wire grid, used as a division, closing load current, overload current, and short -circuit current, and has 0 to 3 automatically overlapping gates. According to the current status of spring mechanisms and electromagnetic institutions, the operating agencies of the 0.6-35kV vacuum circuit breakers currently used in my country are in view of the fact that there are many components in spring mechanisms, complicated manufacturing processes, and operating can easily cause mechanical failures. , Small contact and easily cause problems such as touches when the gate is closed, which seriously affects the performance and reliability of the vacuum circuit breaker. In order to overcome the shortcomings of spring mechanisms and electromagnetic institutions, the reliability, safety and service life of the 6-35kV series of vacuum circuit breakers are increased, and the driver power is reduced. The MDS series 0.6-35KV permanent magnet mechanism has a high reliability, simple structure, safety, long service life, low-drive power, and high cost-effective technological characteristics, which can meet the requirements of the safe and stable operation of the grid. The permanent magnet mechanism is a permanent magnet maintenance for medium-voltage vacuum circuit breakers. Electronic-controlled electromagnetic operating agencies. Compared with traditional spring mechanisms used by circuit breakers, the permanent magnet mechanism uses a brand new working principle. With the structure, there are very few main motion components at work. There is no need to take off, lock device, and less faults. It has high reliability. Therefore, it has become a hot spot for switching manufacturing companies and power grid companies and high -tech heavy industrial enterprises. Overcoming the deficiencies of traditional spring mechanisms and electromagnetic institutions, apply permanent magnets to the operation mechanism, so that the vacuum circuit breaker and the position of the closing position are realized through permanent magnets to replace the traditional lock device.


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