The Advantages and Failure Causes of Vacuum Contactors
The vacuum contactor has strong arc extinguishing ability, good pressure resistance, high operating frequency, long life, no arc spray, body,Small size, light weight, long maintenance cycle. The process requirements for the vacuum interrupter of the vacuum contactor are very high. If the process is poor, the vacuum of the interrupter is easy to drop. Contact material material is bad, the breaking current will be "closure when over-voltage " phenomenon, that is, when the breaking current, due to the strong extinguishing capacity of the vacuum interrupter, the electric arc current is not cut off natural zero crossing, but from A certain value of the current suddenly drops to zero, resulting in a high overvoltage. The cut-off voltage will endanger the safe operation of electrical equipment.