Opening and closing induction current vacuum switch

Abstract

This invention relates to an arc-free close or open outdoor vacuum switch matched with 72.50-500KV outdoor AC high voltage interface switches or an isolation switch having an earth device, in which, this invented on-off sensing current vacuum switch is composed of a vacuum switch mechanical control box and a vacuum switch, the vacuum switch set in a compound insulation sleeve is an upper static conduction contactor and a lower dynamic conduction contactor set in a vacuum chamber, the through end of the insulation sleeve of the upper static conduction contactor is set with a connecting board controlled by the mechanical control box together with the lower dynamic conduction contactor and connected to the earth end, which ensure safety operation of high voltage nets.

Description

technical field [0001] The invention relates to an outdoor vacuum switch capable of realizing arc-free closing or breaking of a 72.5-500KV outdoor AC high-voltage grounding switch or an isolating switch with a grounding device. Background technique [0002] The existing grounding switch or isolating switch with grounding device is operated by auxiliary contact auxiliary main contact, and the mechanical operating mechanism and electrical connection structure of the control contact closing or opening are shown in Figure 1 and Figure 3 As shown, the main contact 6 and the auxiliary contact 5 are grounded and connected in parallel to the circuits 2 and 4, and the isolating switches 1 and 3 are connected in series to the circuits 2 and 4. The output shaft 9 of the operating mechanism in the mechanical operating mechanism is provided with a crank arm 10, The driving mechanism formed by the connecting rod 11, the lower end of the lower moving contact arm 14 is provided with a swing...

AI Technical Summary

Problems solved by technology

[0002] The existing grounding switch or isolating switch with grounding device is operated by auxiliary contact auxiliary main contact, and the mechanical operating mechanism and electrical connection structure of the control contact closing or opening are shown in Figure 1 and Figure 3 As shown, the main contact 6 and the auxiliary contact 5 are grounded and connected in parallel to the circuits 2 and 4, and the isolating switches 1 and 3 are connected in series to the circuits 2 and 4. The output shaft 9 of the operating mechanism in the mechanical operating mechanism is provided with a crank arm 10, The driving mechanism formed by the connecting rod 11, the lower end of the lower moving contact arm 14 is provided with a swing plate 12 with the rotating shaft 13 as the hinge shaft, the connecting rod 11 of the driving mechanism is hinged on one end of the swing plate 12, and drives the lower moving contact arm 14 to swing. The contact arm folding mechanism 16 drives the upper movable contact arm 17 to move up or fall back, and pushes the movable contact 18 of the main contact and the movable contact 23 of the auxiliary contact to move up or fall back, so that the auxiliary contact is ahead of the main contact in the closing operation. In the closing and breaking operation of the contacts, the auxiliary contacts are later than the main contacts in the switching process, so the strong burning arc generated between the auxiliary contacts will not only burn the auxiliary contacts, but even make them melt and stick and cannot continue to close. The closing and breaking operations have seriously affected the safe and reliable operation of the grounding switch or the isolating switch with a grounding device in the high-voltage power grid, and it is also easy to injure the operator and endanger his life.

[0003] To sum up, the key technical problems existing in the existing grounding switch or isolating switch with grounding device are caused by the absence of a special arc extinguishing device.

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