Three-phase common box type three-station isolation grounding switch

Abstract

The invention provides a three-phase common box type three-station isolation grounding switch which comprises a shell, a three-phase isolation static contact, a three-phase grounding static contact, a three-phase supporting conductor and a three-phase moving contact are arranged in the shell, and racks are arranged on the moving contacts; an operating mechanism is arranged outside the shell, and the output end of the operating mechanism is in transmission connection with a main shaft; a gear shaft is rotationally mounted in the supporting conductor through a bearing, and a gear meshed with the rack is arranged on the gear shaft; two of the three insulating rods are in transmission connection between two adjacent phases of gear shafts, the remaining insulating rod is in transmission connection between the gear shafts and the main shaft, and the insulating rods and the gear shafts as well as the insulating rods and the main shaft are in rotation stopping matching through rotation stopping connecting structures respectively. The insulating rod, the gear shaft and the main shaft are arranged in a split mode, installation can be facilitated, machining and installation errors can be made up, meanwhile, the gear shaft is installed through the bearing, rotation stability is guaranteed, correct matching between the gear and the rack can be guaranteed, and the motion precision of the moving contact is improved.

Description

technical field [0001] The invention relates to the technical field of a three-station isolating grounding switch, in particular to a three-phase common box type three-station isolating and grounding switch. Background technique [0002] The high-voltage isolation / grounding switch is the most widely used high-voltage electrical equipment in the power system. Its functions in the power system are as follows: 1. Isolation and grounding. 2. Switching function, switching lines and busbars. 3. Closing and breaking functions. At present, most of the isolation / grounding switches above 220kV adopt a sub-box structure, and the outside of the sub-box structure is connected by interphase connecting rods. This structure is affected by the main equipment such as circuit breakers, and the phase spacing is relatively large. There are many connecting rod transmission links and there are connected parts. There will always be gaps, which will inevitably lead to angle loss, so the angle devi...

AI Technical Summary

Problems solved by technology

[0005] However, in practical applications, due to the existence of machining errors and installation errors, it is difficult for the one-piece insulated shaft to ensure accurate meshing with the racks on the three-phase moving contacts, and the insulated shaft is connected to the support block through paste grease. There is only a bearing at the end of the insulated shaft that cooperates with the transmission of the operating mechanism. On the one hand, it cannot effectively ensure the smooth rotation of the insulated shaft, which will affect the cooperation between the gear and the rack, and then affect the On the other hand, if the pasty grease splashes or drips under the rotation of the insulating shaft, there will be a safety risk

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