Combined-type high-voltage conversion switch

Abstract

The invention discloses a combined-type high-voltage conversion switch which comprises a double-power-supply switching device and a vacuum circuit breaker, wherein the double-power-supply switching device comprises a main power supply post, an auxiliary power supply post, a wire outlet column; and the vacuum circuit breaker comprises a wire inlet terminal, a wire outlet terminal, a vacuum extinction mechanism and an operation mechanism. The double-power-supply switching device also comprises a main vacuum extinction mechanism electrically connected with the main power supply post and an auxiliary vacuum extinction mechanism electrically connected with the auxiliary power supply post; the switching operation mechanism comprises a driving mechanism with a driving arm, a lever and an interlocking mechanism which is used for synchronously driving the switch-on and switch-off motions of the main vacuum extinction mechanism and the auxiliary vacuum extinction mechanism; the driving arm in the driving mechanism is connected with one end of the lever in a rotation mode, and the other end of the lever is connected with the interlocking mechanism; and the wire inlet terminal of the vacuum circuit breaker is electrically connected with the wire outlet terminal in the double power supply switching device. According to the invention, the time required for double-power-supply switching is shorter, and the double-power-supply switching is approximate to non-time-difference switching.

Description

technical field [0001] The invention belongs to the technical field of high-voltage dual power switch structure design, and in particular relates to a combined high-voltage transfer switch. Background technique [0002] At present, in order to improve the reliability of power supply, a large number of dual power supply lines (two power supply lines, generally one power system line and one self-contained line) are used in the power supply system. When the power supply of one line fails, the other line supplies power. . For this reason, control devices are needed, and no less than two high-voltage switchgears should be used indoors, and no less than two high-voltage switches on poles should be used outdoors, so as to realize the requirements of selecting power supply lines. This control method not only increases the user's equipment and operating costs, but also poses hidden dangers of power supply accidents. For two or more high-voltage switchgear / column-mounted high-voltag...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent application 200610154471.3 discloses an outdoor high-voltage dual-power vacuum circuit breaker. This type of vacuum circuit breaker is equipped with a high-voltage dual-power conversion device consisting of a chained double-throw isolating switch on the vacuum circuit breaker. Although this method realizes high-voltage There are electrical interlocking and mechanical interlocking when the dual power supply is automatically switched, which reduces the possibility of two high-voltage feeds at the same time. It is an ideal high-voltage dual power switching device at present, but there are still drawbacks. In the external environment, with the increase of the number of times and time of use, the surface of the contact will continue to oxidize, resulting in an increase in the resistance of the contact and a decrease in the conductivity, and the contact is prone to heat and burnout.

In addition, the specific switching operation process of this kind of dual-power vacuum circuit breaker is: first disconnect the dynamic and static conductive contacts in the vacuum interrupter, and then use the double-throw isolating switch to switch between dual power sources, so the switching time is long and generally requires More than 10 seconds, such a long power outage time will cause the electrical appliances to restart before they can run, seriously reducing work efficiency

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