Contact system structure of vacuum arc extinguishing chamber

Abstract

The invention discloses a contact system structure of a vacuum arc extinguishing chamber. The contact system structure comprises a contact system (1), wherein an inner contact (2) is arranged in the contact system (1), and a main contact (4) is arranged above the contact system (1); and the lower part of the main contact (4) is connected with a hook ring (3), and the inner contact (2) is connectedwith the main contact (4) through the hook ring (3). According to the scheme of the invention, the loop resistance of the vacuum arc extinguishing chamber can be reduced, and thus the temperature rise can be reduced, and the purpose of increasing the rated current can be achieved; and meanwhile, since a coil of a contact base does not bear the temperature rise part of the rated current, a 1 / 2 turn or longer coil can be used to improve the short-circuit breaking current capability, and thus the purpose of reducing bounce can also be achieved.

Description

technical field [0001] The invention relates to a power element, in particular to a contact system structure of a vacuum interrupter. Background technique [0002] Vacuum interrupter, also known as vacuum switch tube, is the core component of medium and high voltage power switches. Its main function is to use the high vacuum inside the tube as the arc extinguishing insulating medium, so that the medium and high voltage circuits can quickly extinguish the arc and suppress the current after the power is cut off. Avoid accidents and accidents. When the vacuum switch performs current closing and opening, it is completed by a pair of opposing contact systems in the arc extinguishing chamber of the operating mechanism located outside the vacuum interrupter. When the switch is working, the steady state of each part of the arc extinguishing chamber The temperature rise cannot exceed the allowable value to ensure the reliable operation of the switch. The contact system is the core ...

AI Technical Summary

Problems solved by technology

To sum up, the current large-capacity vacuum interrupter has the problems of large circuit resistance, high temperature rise, and long bounce time; for large-capacity vacuum interrupters, when the rated current and breaking current increase, A contact system with a long coil structure is required to ensure the performance of the interrupter. At the same time, due to the lengthening of the coil structure, the resistance increases, which leads to the contradiction of increasing the temperature rise.

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