The disclosure discloses an optical path system for detecting a vacuum degree of a vacuum switch and a method thereof. In the optical path system, a plasma excitation unit excites pulsed laser along an excitation optical path to bombard a shielding case of a vacuum switch to be detected, so as to generate laser plasma; an optical path focusing unit focuses the excitation optical path and a collection optical path to focus the pulsed laser on the shielding case of the vacuum switch to be detected; the optical path focusing unit includes a visible laser device for generating visible light and an adjustment device for adjusting the excitation optical path; an image collection unit collects a laser plasma image and a visible light spot focusing image; the image collection unit includes a gated detector for collecting the visible light spot image and the laser plasma image via the collection optical path.

The disclosure discloses an optical path system for detecting a vacuum degree of a vacuum switch and a method thereof. In the optical path system, a plasma excitation unit excites pulsed laser along an excitation optical path to bombard a shielding case of a vacuum switch to be detected, so as to generate laser plasma; an optical path focusing unit focuses the excitation optical path and a collection optical path to focus the pulsed laser on the shielding case of the vacuum switch to be detected; the optical path focusing unit includes a visible laser device for generating visible light and an adjustment device for adjusting the excitation optical path; an image collection unit collects a laser plasma image and a visible light spot focusing image; the image collection unit includes a gated detector for collecting the visible light spot image and the laser plasma image via the collection optical path.

A closed and open contact method to predict a usable life of vacuum interrupters in the field can include using computer instructions in the data storage to instruct the processor to position a calculated amp or calculated pressure on an ionic or current versus pressure calibration curve for the installed vacuum interrupter and identify trend data from a library of trend data corresponding to the installed vacuum interrupter and to the calculated pressure or calculated amp of the installed vacuum interrupter; thereby determining the anticipated life expectancy.

A vacuum degree detection device with buried electrodes in a vacuum interrupter and a method thereof are provided. The vacuum degree wireless detection device includes two parts, wherein a first part is provided inside the vacuum interrupter, including buried electrodes, etc., wherein the buried electrodes are welded on an end cover of the vacuum interrupter; a second part is the external detection device after the arc interrupter is processed, including: detection and calculation components, wireless transmitters, rechargeable energy storage batteries, wireless charging coils, etc. The external detection device and the buried electrode structure is designed separately, and the buried structure such as the buried electrodes can be processed as a whole with the vacuum interrupter. During the detection, the external detection device is installed above the buried electrode structure.

A vacuum degree detection device with buried electrodes in a vacuum interrupter and a method thereof are provided. The vacuum degree wireless detection device includes two parts, wherein a first part is provided inside the vacuum interrupter, including buried electrodes, etc., wherein the buried electrodes are welded on an end cover of the vacuum interrupter; a second part is the external detection device after the arc interrupter is processed, including: detection and calculation components, wireless transmitters, rechargeable energy storage batteries, wireless charging coils, etc. The external detection device and the buried electrode structure is designed separately, and the buried structure such as the buried electrodes can be processed as a whole with the vacuum interrupter. During the detection, the external detection device is installed above the buried electrode structure.

Techniques for detecting vacuum loss in a vacuum interrupter are disclosed. For example, a sensing system of a vacuum interrupter includes a sensor including a material that oxidizes in the presence of air and is at least partially positioned in an evacuated space of a vacuum interrupter, the sensor being configured to produce an indication of impedance of the material; and a control system coupled to the sensor, the control system including an electronic processor and an electronic storage that stores instructions that, when executed, cause the electronic processor to access an indication of impedance produced by the sensor, determine a measure of impedance of the material of the sensor based on the accessed indication of impedance, and determine a condition of the evacuated space based on the determined measure of impedance.

Techniques for detecting vacuum loss in a vacuum interrupter are disclosed. For example, a sensing system of a vacuum interrupter includes a sensor including a material that oxidizes in the presence of air and is at least partially positioned in an evacuated space of a vacuum interrupter, the sensor being configured to produce an indication of impedance of the material; and a control system coupled to the sensor, the control system including an electronic processor and an electronic storage that stores instructions that, when executed, cause the electronic processor to access an indication of impedance produced by the sensor, determine a measure of impedance of the material of the sensor based on the accessed indication of impedance, and determine a condition of the evacuated space based on the determined measure of impedance.

A closed and open contact method to predict a usable life of vacuum interrupters in the field can include using computer instructions in the data storage to instruct the processor to position a calculated amp or calculated pressure on an ionic or current versus pressure calibration curve for the installed vacuum interrupter and identify trend data from a library of trend data corresponding to the installed vacuum interrupter and to the calculated pressure or calculated amp of the installed vacuum interrupter; thereby determining the anticipated life expectancy.

Embodiments relate to a method for monitoring the vacuum interrupter's condition of an electric device. The method comprises receiving a first voltage signal indicating a first voltage at a first contact of a switch inside the electric device. The first contact of the switch is coupled to a source line. The method further comprises receiving a second voltage signal indicating a second voltage at a second contact of the switch. The second contact of the switch is coupled to a reactive component. The method comprises receiving a current signal indicating a current at the second contact of the switch. The method comprises determining occurrence of a restrike in response to determining increasing amplitudes of the first voltage signal, the second voltage signal and the current signal in a time slot. The method further comprises determining the vacuum interrupter condition based on the determined occurrence of the restrike.

Embodiments relate to a method for monitoring the vacuum interrupter's condition of an electric device. The method comprises receiving a first voltage signal indicating a first voltage at a first contact of a switch inside the electric device. The first contact of the switch is coupled to a source line. The method further comprises receiving a second voltage signal indicating a second voltage at a second contact of the switch. The second contact of the switch is coupled to a reactive component. The method comprises receiving a current signal indicating a current at the second contact of the switch. The method comprises determining occurrence of a restrike in response to determining increasing amplitudes of the first voltage signal, the second voltage signal and the current signal in a time slot. The method further comprises determining the vacuum interrupter condition based on the determined occurrence of the restrike.