A trigger vacuum interrupter with large current breaking capability and its working method

Abstract

The invention discloses a triggering vacuum interrupter with large current breaking capacity, which comprises a static conductive rod, a static contact arranged at the end of the static conductive rod, and a moving conductive rod arranged at the end of the dynamic conductive rod and the static contact. The moving contact with the relative position of the head; the moving contact of the moving conductive rod is a hollow structure, and the middle position of the hollow structure is provided with a metal trigger core and an insulating material tightly coated on the outside of the metal trigger core, and the insulating material is connected with the moving conductive rod and The moving contact does not touch, the insulating material is connected to the inner wall of the moving conductive rod through the inner bellows, and the vacuum seal inside the arc extinguishing chamber is kept during the moving process of the moving contact, and the metal trigger core and its outer tightly covered metal trigger core are kept in the moving process of the moving contact. The insulating material remains still, and the arc is transferred to the moving contact after triggering, which avoids the ablation of the metal trigger core by the arc, so that it has the breaking capacity of high current.

Description

technical field [0001] The invention belongs to the technical field of circuit breakers, and in particular relates to a triggering vacuum interrupter with large current breaking capability and a working method thereof. Background technique [0002] The construction of smart grid is inseparable from smart appliances. One of the key indicators of smart appliances is to achieve accurate and fast switching operations. As a smart electrical appliance capable of breaking and closing large currents, the vacuum circuit breaker is an important device for building a smart grid. At present, the minimum opening time of vacuum circuit breakers can reach less than 1 millisecond, and the dispersion is not more than 50 microseconds. But the closing time is as high as tens of milliseconds, and its dispersion is several milliseconds. Its high closing time and its dispersion seriously restrict the further promotion of vacuum circuit breakers in smart grids. Fast closing by triggering the co...

AI Technical Summary

Problems solved by technology

However, the trigger core of the arc extinguishing chamber is directly connected to the static contact. When a high-voltage pulse signal is loaded between the trigger core and the static contact, the voltage at the tip of the trigger core will also be loaded on the moving contact, resulting in The head voltage drop is small, the electric field strength generated around the trigger core is small, it is difficult to ionize the surrounding medium to cause breakdown, and it does not have a good trigger ability; after triggering, the trigger electrode is still in the path formed by the arc, and the arc has a serious impact on the trigger pole. Ablative effect, so that the arc extinguishing chamber does not have the ability to break large current

Images