A direct-current circuit includes: a breaker that is inserted into the direct-current line and becomes a path for direct current when in a steady state; a resonance circuit connected in parallel with the breaker and superimposing resonance current on the direct current; and a first disconnector and a second disconnector connected to first and second connection points of the breaker and the resonance circuit, respectively, and forming a path for the direct current together with the breaker. The resonance circuit includes a series circuit that includes a capacitor and a reactor and generates the resonance current, a charging resistor for charging the capacitor with a direct-current potential of the direct-current line, a high-speed switch connected in series with the series circuit on the capacitor side and superimposing the resonance current on the direct current, and an arrester connected in parallel with the capacitor and the high-speed switch.

The present invention relates to a main circuit part of a vacuum circuit breaker, and more particularly, to a main circuit part of a vacuum circuit breaker with a temperature sensor. The main circuit part of a vacuum circuit breaker with a self-powered temperature sensor assembly includes: a self-powered temperature sensor module; and a support bracket enclosing and supporting the self-powered temperature sensor module.

This invention involves composite embedded-pole and its operating principles, including an insulating cylinder which has upper and lower cavities, and one of its ends tightly connects a sealed cap. As for the upper cavity, there is an outlet block on the left end, a spacing-set pair of static conductive blocks which bond with each other in the middle, and a grounding block on the right. Parts of the left static conductive block inserts into the left of the lower cavity. The lead screw in the upper cavity is for rotary location with one end stretching out the sealed cap. The lead screw, spirally connects with moving contact set that matches with outlet block, static conductive block, and grounding block forming a 3-bonding-position. There is a vacuum interrupter in the lower cavity, whose static contact bonding with the left static conductive block, and the outer end of the moving contact flexibly couples with the left of the insulating pull rod. What's more, the flexible coupling bonds with one end of the lower outlet rod which is embedded in the lower part of the insulating cylinder. The right end of insulating pull rod stretches out the sealed cap while operating. This invention of EP is suitable for switchgears, with small volume, convenient and reliable installation and operation.

A configuration for generating a zero current pulse for generating a zero current crossing in an electrical component through which a direct current flows, in particular a vacuum interrupter, includes a switch and an electrical energy storage device or store having two poles through which the electrical energy storage device can be charged by a voltage source. A loop can be formed by the energy storage device, the electrical component through which the direct current flows and the switch, so that the energy storage device can be discharged by closing the switch while generating a zero current pulse counter to the direct current across the electrical component. The energy storage device has a plurality of energy storage elements for mutual generation of a zero current pulse.

A configuration for generating a zero current pulse for generating a zero current crossing in an electrical component through which a direct current flows, in particular a vacuum interrupter, includes a switch and an electrical energy storage device or store having two poles through which the electrical energy storage device can be charged by a voltage source. A loop can be formed by the energy storage device, the electrical component through which the direct current flows and the switch, so that the energy storage device can be discharged by closing the switch while generating a zero current pulse counter to the direct current across the electrical component. The energy storage device has a plurality of energy storage elements for mutual generation of a zero current pulse.

An embedded pole is provided which includes a conductive path and a movable contact. The movable contact is selectively movable between a first position in which the conductive path is closed and a second position in which the conductive path is open. An insulation element is coupled to and selectively movable in conjunction with the movable contact. The embedded pole further includes a sensor coupled to the insulation element and operable to detect a displacement of the insulation element that corresponds to a movement of the movable contact between the first position and the second position.

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 switchgear system operable at voltages up to 27 kV includes an enclosure containing atmospheric air and a loadbreak module disposed within the enclosure. The loadbreak module includes a loadbreak module housing made of a solid dielectric material, a vacuum interrupter enclosed within the loadbreak module housing and having a fixed contact and a movable contact, and an interchange electrically connected to the movable contact. The vacuum interrupter is operable to selectively break or establish an electrical pathway between the interchange and a terminal in response to movement of the movable contact relative to the fixed contact. The switchgear system further includes a bushing coupled to the enclosure and a disconnect switch electrically connected in series between the loadbreak module and the bushing. The disconnect switch includes a disconnect switch housing made of a solid dielectric material.

Various embodiments of the teachings herein include methods for determining the state of an electrical switchgear assembly. The method may include: measuring an electric current and a voltage dropped across the switchgear assembly; ascertaining a time interval of an arc occurring during a switching operation; comparing the ascertained time interval to a reference value specific to the switchgear assembly; measuring a voltage profile during the time interval; and comparing the voltage profile with a reference voltage profile. The time interval begins when the value of the measured voltage exceeds a first threshold value. The time interval ends when the value of the current intensity falls below a second threshold value.

A switch for a medium or high voltage traction line testing device includes a plurality of normally-opened pairs of contacts connected in series, wherein each pair of contacts is equipped with a separate control coil. The switch further comprises a wireless power transfer supply module being on ground potential for supplying cascaded wireless power transfer receivers comprising the transmitting coil, high frequency inverter and microcontroller, a plurality of cascaded wireless power transfer receivers for supplying control coil of pairs of contacts. Each of the wireless power transfer receivers is referenced to the floating potential and comprises a receiving coil. Each of the control coils is connected to one of the wireless power transfer receivers. The receiving coils of the wireless power transfer receivers are magnetically coupled, and a wireless power transfer supply module is located in the middle of the cascaded wireless power transfer receivers.