Operation device of direct current circuit breaker and operation method of operation device

Abstract

The invention discloses an operation device of a direct current circuit breaker and an operation method of the operation device. The operation device comprises a vacuum bubble, a repulsion device andan electromagnetic mechanism connected with the repulsion mechanism through a connection rod. A mechanical contact consisting of a static contact and a moving contact is arranged in the vacuum bubble.The moving contact is connected with the repulsion mechanism through an insulation pull rod. The repulsion mechanism comprises a separating coil, a repulsion disc, a charging / discharging loop and a first controller controlling the charging / discharging loop to trigger the separating coil. The repulsion disc is connected with the connection rod through a moving guidance rod. The separating coil isarranged on the repulsion disc and the gap is not more than 3.5 mm. The electromagnetic mechanism comprises an annular hollow static iron core, a moving iron core, an attracting coil, a keeping coil,a separating reset coil, a contact spring and a second controller.

Description

technical field [0001] The invention relates to the field of a DC circuit breaker, in particular to an operating device and an operating method for a DC circuit breaker. Background technique [0002] Due to the low cost of the DC system, no capacitive current, no eddy current loss, and easier control of the power flow, the DC HVDC transmission system has attracted much attention. Especially in some specific occasions, such as large-scale ship power supply system, urban rail transit power supply system and other DC systems have been greatly developed. At the same time, with the continuous increase of the capacity of the DC system and the continuous improvement of the voltage level, the peak value of the short-circuit current can reach more than 100kA, and the rate of increase of the short-circuit current is also more than 15A / us. [0003] Patent document CN201156495Y discloses an operating mechanism in a circuit breaker comprising an electromagnetic repulsion driving mechani...

AI Technical Summary

Problems solved by technology

This patent is based on the fast repulsion switch held by permanent magnets, which can effectively increase the opening speed of the switch, but the patent cannot achieve rated opening and closing. At the same time, it can quickly open when the short-circuit fault current arrives, and on the premise of realizing the two functions, Realize long service life of rated opening and closing, fast opening, small mass and fast speed of movable parts, improve service life of DC circuit breaker, reduce closing speed

[0005] The current quick operating mechanism is difficult to meet the life requirements of rated opening and closing on the basis of realizing quick opening and closing

In some occasions that require frequent on-off, it cannot be better compatible with the requirements of high rated opening and closing life and fast opening and closing speed.

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