The Need For The Development Of Sealed Pole Products
When the external insulation of the miniaturized vacuum interrupter in the air cannot meet the parameter values specified in the Embedded Pole standard, the sealing of the vacuum interrupter is one of the effective ways to ensure the external insulation without increasing the cost of the vacuum circuit breaker. In the decades of development of switchgear, the insulation performance has been improved several times, while the installation area of the switchgear has been reduced by about 50%. The use of miniaturized and maintenance-free equipment can reduce the frequency of maintenance, extend the maintenance cycle, and reduce the floor space of the switchgear. This greatly reduces the labor intensity of the operating personnel and the operation and maintenance costs. After years of research, solid insulation is undoubtedly one of the solutions for miniaturization and improved environmental resistance. Some well-known foreign companies use the same shape of vacuum interrupter (different inside) for 12kV and 24kV vacuum interrupters, but the conditions of use are different. The same shape of vacuum interrupter is 12kV when used in the air; the voltage level of the vacuum interrupter is increased to 24kV under the condition of external insulation protection. The external insulation protection of the vacuum interrupter is generally placed in an insulating gas environment, an insulating liquid environment, and sealed. The sealing of the vacuum interrupter can not only realize the miniaturization of the vacuum interrupter, but also realize the miniaturization of the vacuum circuit breaker.
