A medium- or high-voltage switch (10), comprising a high-vacuum enclosure (111); first and second contacts (121, 122) that are mounted to be movable in translation relative to each other inside the enclosure (111) between an open position in which the first and second contacts (121, 122) are spaced apart; and a closed position in which the first and second contacts (121, 122) are in electrical contact. The switch (10) further comprises a conductor (210, 220, 230) arranged inside the enclosure (111) in such a manner that there exists a pressure threshold inside the enclosure (111) from which partial discharges are generated by said conductor, at least when the first and second contacts (121, 122) are in the closed position and the medium or high voltage is applied to the switch (10). The invention further relates to a switch assembly and to a method of testing such a switch.

A vacuum monitoring device of a vacuum circuit breaker with a line of a vacuum valve led out to the external of a metal tank through a bushing having a shield working as a low-pass filter, includes: a first antenna; a second antenna; a first and a second detection portion measuring intensity of an electromagnetic wave detected by the antennas; and a determination portion determining a vacuum deterioration of the circuit breaker by comparing the intensity of the electromagnetic wave detected by the first and the second detection portions, wherein the first and second detection portion include frequency filters passing a frequency band, of electromagnetic waves resulting from discharges occurring when the vacuum valve deteriorates in vacuum, which is attenuated by the shield.

A vacuum monitoring device of a vacuum circuit breaker with a line of a vacuum valve led out to the external of a metal tank through a bushing having a shield working as a low-pass filter, includes: a first antenna; a second antenna; a first and a second detection portion measuring intensity of an electromagnetic wave detected by the antennas; and a determination portion determining a vacuum deterioration of the circuit breaker by comparing the intensity of the electromagnetic wave detected by the first and the second detection portions, wherein the first and second detection portion include frequency filters passing a frequency band, of electromagnetic waves resulting from discharges occurring when the vacuum valve deteriorates in vacuum, which is attenuated by the shield.

A method for detecting breakdown vacuum level of a composite breakdown path includes steps of: based on a fact that different electrode shapes provide different electric field strengths, designing the composite breakdown path according to breakdown voltage characteristic differences of different breakdown paths; and based on breakdown results of different electrode structures in the different breakdown paths, performing vacuum interrupter vacuum level measurement and calibration. Based on the fact that there are large differences in the breakdown voltages of different electrode gaps under different vacuum conditions, the method can improve the vacuum level detection accuracy of high-voltage vacuum interrupter through the measurement and judgment of breakdown voltages between multiple different electrodes, and can complete the breakdown judgment under the insulating gas environment with high vacuum level or complete leakage, thereby promoting the development of vacuum level detection method for high-voltage vacuum interrupter.

A method for detecting breakdown vacuum level of a composite breakdown path includes steps of: based on a fact that different electrode shapes provide different electric field strengths, designing the composite breakdown path according to breakdown voltage characteristic differences of different breakdown paths; and based on breakdown results of different electrode structures in the different breakdown paths, performing vacuum interrupter vacuum level measurement and calibration. Based on the fact that there are large differences in the breakdown voltages of different electrode gaps under different vacuum conditions, the method can improve the vacuum level detection accuracy of high-voltage vacuum interrupter through the measurement and judgment of breakdown voltages between multiple different electrodes, and can complete the breakdown judgment under the insulating gas environment with high vacuum level or complete leakage, thereby promoting the development of vacuum level detection method for high-voltage vacuum interrupter.

The disclosure relates to a method for monitoring a vacuum on-load tap changer including determining a total main vacuum interrupter opening time as a time elapsed between a first point in time and a second point in time, a total resistor vacuum interrupter opening time as a time elapsed between the third point in time and the fourth point in time, a circulating current time as a time elapsed between the second point in time and the third point in time, and/or a switch time as the sum of the total main vacuum interrupter opening time, the total resistor vacuum interrupter opening time and the circulating current time.

The disclosure relates to a method for monitoring a vacuum on-load tap changer including determining a total main vacuum interrupter opening time as a time elapsed between a first point in time and a second point in time, a total resistor vacuum interrupter opening time as a time elapsed between the third point in time and the fourth point in time, a circulating current time as a time elapsed between the second point in time and the third point in time, and/or a switch time as the sum of the total main vacuum interrupter opening time, the total resistor vacuum interrupter opening time and the circulating current time.

The present disclosure discloses a vacuum degree detection device, a monitoring system and a vacuum arc-extinguishing chamber thereof, wherein, in the vacuum degree detection device, a ceramic insulating housing is sealingly fixed to an end face cover plate of the vacuum arc-extinguishing chamber, the ceramic insulating housing is a circular ring-shaped structure coaxial with a conductive rod on the end face cover plate, a sealing area formed by the end face cover plate and the ceramic insulating housing is provided with a through hole communicating with the vacuum arc-extinguishing chamber; a thermoelectric vacuum sensor is disposed inside the ceramic insulating housing to detect the vacuum degree of the vacuum arc-extinguishing chamber, a cold end is fixed to the end face cover plate, an electrode is supported on the cold end, a thermoelectric arm is supported on the electrode, a hot end is laminated to the thermoelectric arm.

The present disclosure discloses a vacuum degree detection device, a monitoring system and a vacuum arc-extinguishing chamber thereof, wherein, in the vacuum degree detection device, a ceramic insulating housing is sealingly fixed to an end face cover plate of the vacuum arc-extinguishing chamber, the ceramic insulating housing is a circular ring-shaped structure coaxial with a conductive rod on the end face cover plate, a sealing area formed by the end face cover plate and the ceramic insulating housing is provided with a through hole communicating with the vacuum arc-extinguishing chamber; a thermoelectric vacuum sensor is disposed inside the ceramic insulating housing to detect the vacuum degree of the vacuum arc-extinguishing chamber, a cold end is fixed to the end face cover plate, an electrode is supported on the cold end, a thermoelectric arm is supported on the electrode, a hot end is laminated to the thermoelectric arm.

The present disclosure provides a vacuum circuit breaker which can measure and monitor temperature of a tulip contactor, the vacuum circuit breaker comprising: a conductive pole including a tulip contactor; and a temperature detecting sensor disposed adjacent to the tulip contactor, wherein the temperature detecting sensor comprises: a sensor body; a fixing band coupled to the sensor body and disposed to surround a part of the conductive pole; and a temperature measurement part which comes into contact with a specific point of the tulip contactor to measure the temperature of the specific point, wherein a sensor insertion hole for accommodating a part of the temperature measurement part is recessedly formed at one surface of the tulip contactor facing the sensor body.