Application Technology Of High Voltage Vacuum Circuit Breaker
Reasonable selection of Lv Pole Mounted Circuit Breakers The concept of electrical life of high-voltage vacuum circuit breakers: the number of full-capacity interruptions specified in the technical conditions of the equipment and actually performed in the type test. In the actual use of the equipment, technicians cannot perform maintenance and replacement work on the contacts of high-voltage vacuum circuit breakers, so high-voltage vacuum circuit breakers must have a long electrical life. Nowadays, the new generation of vacuum interrupters uses copper-chromium contacts and longitudinal magnetic field electrode materials. The longitudinal magnetic field electrode effectively reduces the arc voltage. In order to evenly distribute the arc on the contact surface, the copper-chromium contact material reduces the amount of contact burnout, thereby extending the electrical life of the high-voltage vacuum circuit breaker. With the advancement of science and technology, the performance of high-voltage vacuum circuit breakers in my country has been continuously improved and the stability has been continuously enhanced.
Temperature rise of high-voltage vacuum circuit breakers
The heat source that affects the temperature rise is mainly the loop resistance. Under normal circumstances, the loop resistance of the arc extinguishing chamber accounts for a large proportion of the loop resistance of the high-voltage vacuum circuit breaker. As one of the components of the loop resistance of the vacuum interrupter, the contact gap contact resistance generates heat that is dissipated to the outside world through the dynamic and static conductive rods. This is because the contact system is located in the environment of the vacuum interrupter. The static end of the vacuum interrupter is connected to the static bracket, and the dynamic end is connected to the dynamic bracket. When the dynamic end moves upward, it has the effect of heat dissipation. The dynamic end has many links, so the heat conduction path is relatively long. In daily life, the use of the static end can play a good role in heat dissipation. When the heat in the contact gap is high, it is derived from the static end position. This method effectively solves the problem of high temperature rise of the equipment.
Leakage problem of vacuum interrupter
Usually, the material used for the bellows of the vacuum interrupter is 0.15mm thick stainless steel. If the application environment of the high-voltage vacuum circuit breaker is not selected in place, the bellows of the high-voltage vacuum circuit breaker will be corroded, resulting in leakage between the cover plate and the bellows. In order to effectively solve the leakage problem of the vacuum interrupter, technicians need to reasonably adjust the position of the concentricity of the high-voltage vacuum circuit breaker and select the correct storage environment.
Pay attention to the adjustment of mechanical parameters of high-voltage vacuum circuit breakers
Under normal circumstances, the service life of high-voltage vacuum circuit breakers in my country is between 10,000 and 20,000 times. Researchers are conducting research and development work to increase the service life of high-voltage vacuum circuit breakers to 30,000 to 40,000 times. Electromagnetism has many advantages, such as reliable performance, convenient adjustment and maintenance, and simple mechanism structure, so it is widely used. In addition, some areas are accustomed to using electric spring operating mechanisms. The operating mechanism is the most complex part of the high-voltage vacuum circuit breaker equipment. At present, the technical conditions of many manufacturers cannot meet the accuracy requirements of the operating mechanism. In order to improve the quality of high-voltage vacuum circuit breakers, Chinese researchers have carried out a lot of research and development work on this, such as using a split-type structural method in high-voltage vacuum circuit breakers. The operating principle is: first, separate the circuit breaker and the operating mechanism; second, the operating mechanism is produced by a factory with good conditions and equipment; finally, the circuit breaker of the mechanism is combined with the output shaft. Reasonable setting of mechanical parameters can improve the service life of high-voltage vacuum circuit breakers and increase the practical performance of high-voltage vacuum circuit breakers. Therefore, adjusting appropriate mechanical parameters can effectively improve the practical performance of high-voltage vacuum circuit breakers. Under normal circumstances, the buffer distance will increase, and the buffer characteristics will become steeper. After absorbing the separation energy, the opening stroke and the rebound of the opening can be effectively limited.
Improve the reliability of the action of high-voltage vacuum circuit breakers In order to improve the reliability of the action of high-voltage vacuum circuit breakers, technicians need to do the following four things: First, be familiar with the basic structure of high-voltage vacuum circuit breakers and understand the various parameters of high-voltage vacuum circuit breakers. In the process of using the equipment, technicians need to keep in touch with manufacturers. In daily life, technicians also need to continue to learn advanced technologies of high-voltage vacuum circuit breakers; second, technicians need to be responsible for the debugging of mechanical parameters of high-voltage vacuum circuit breakers, and at the same time be responsible for adjusting the various parameters of high-voltage vacuum circuit breakers to ensure the normal use of high-voltage vacuum circuit breakers; third, in the process of managing spare parts, technicians need to ensure the practicality of the performance indicators of spare parts; fourth, technicians need to summarize experience and work together with manufacturers to improve the reliability of vacuum circuit breakers.
