The Circuit Breaker Vacuum Degree Detector Equipment is mainly used to quantitatively measure the vacuum degree in various types of vacuum switch arc extinguishing chambers. It uses a single-chip computer as the main control unit, and the testing process is fully automated. In principle, it changes the method of calibrating similar products at home and abroad using current peak value, and uses ion charge for calibration, effectively suppressing the interference of pulse power supply during the testing process, making the testing more stable and reliable.
The Circuit Breaker Vacuum Degree Detector Equipment uses magnetron discharge method for measurement. Pull apart the two contacts of the vacuum switch arc extinguishing chamber by a certain distance, apply electric field pulse high voltage, place the arc extinguishing chamber inside the solenoid coil or place the new electromagnetic coil outside the arc extinguishing chamber, and apply a large current to the coil to generate a pulse magnetic field synchronized with the high voltage inside the arc extinguishing chamber. In this way, under the action of pulsed strong magnetic field and strong electric field, the charged ions in the arc extinguishing chamber undergo spiral motion and collide with residual gas molecules for ionization. The resulting ion current is approximately proportional to the residual gas density, i.e. vacuum degree. For different vacuum tube models (tube types), due to their different structures, the magnitude of ion current varies under the same contact distance, vacuum degree, electric and magnetic fields. The corresponding relationship curve between vacuum degree and ion current of various tube types can be calibrated through experiments. After measuring the ion current, the vacuum degree of the tube type can be obtained by querying the ion current vacuum degree curve of the tube type.
When testing the vacuum degree of the arc extinguishing chamber in conventional magnetron discharge, in order to improve its testing sensitivity, the arc extinguishing chamber needs to be removed from the circuit breaker and placed inside the solenoid tube. In this way, the arc extinguishing chamber needs to adjust the mechanical parameters when reinstalling the circuit breaker, which requires a lot of work and professional personnel. The use of a new type of magnetic coil can surround the arc extinguishing chamber from the side, so there is no need to disassemble the arc extinguishing chamber. By using a single-chip microcomputer for synchronous control and data acquisition and processing, the sensitivity of on-site testing of the vacuum degree in the arc extinguishing chamber has been improved.