Three-phase rapid switching apparatus applicable to high current

Abstract

The invention discloses a three-phase rapid switching apparatus applicable to a high current. The switching apparatus comprises a switching mechanism; one side of the switching mechanism is connected with a power mechanism; the switching mechanism comprises a shell body, a base, a connecting plate and a transmission shaft; the shell body is arranged outside the switching mechanism, and the base is arranged at one end of the shell body; arc chute sheets are uniformly distributed on the base; the connecting plate is arranged on the inner side of the base; the connecting plate is fixedly connected with contact points; the transmission shaft is arranged in the shell body; a main shaft is arranged outside the transmission shaft; and contacts are connected with the main shaft on one side of the contact points. The switching apparatus can realize rapid switching between three-phase high-current circuits, so that the circuit interruption time can be lowered, possibility of short circuit caused by breaking of electric arc and a condition of inter-phase short circuit caused by program error can be avoided, and high contact reliability and long service life can be realized.

Description

technical field [0001] The invention relates to the field of low-voltage electrical technology, in particular to a three-phase fast switching device suitable for high current. Background technique [0002] In the current low-voltage electrical industry, the devices used for fast switching of large currents are usually ordinary relays that control the opening and closing of single-phase lines, and single-pole double-throw relays for switching between two phases have also appeared, but there is no single device that can realize The function of fast switching between three-phase high-current lines. [0003] Currently, three-phase fast switching for large currents is mainly realized using a combination of ordinary relays or single-pole double-throw relays. Among them, three ordinary relays are used, and the breaking and closing sequences of the three relays are controlled respectively through the program, so as to realize the purpose of switching between the three phases. The ...

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Problems solved by technology

The advantage of this method is that the technology is more mature and the interlocking mechanism can prevent the short circuit caused by the switching logic. The disadvantage is that the switching logic is complicated, the switching time is long, the cost is high, and there is no arc extinguishing device.

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