Gas insulation opening and closing arrangement

Abstract

The objective is to provide a gas insulated switchgear which is downsized in the direction of security of an aerial insulation distance between head aerial terminals in each bushing. A bushing 4a with its one end connected to a breaker 1 is arranged at a virtual vertical plane 11 which passes the center axis of the breaker sealing container 7 of the breaker 1, and a bushing 4b which is connected via a disconnector 2a to the other end of the breaker 1 is arranged on a virtual vertical plane 12 arranged behind in roughly parallel with the virtual vertical plane 11, and a bushing 4c which is connected via a disconnector 2b to the other end of the breaker 1 is arranged on a virtual vertical plane 14 arranged before in roughly parallel with the virtual vertical plane 11 so as to give an aerial insulation distance, and also a disconnector sealing container 10 for the disconnector 2a is arranged under the bushing 4b arranged in the middle, higher than other bushings 4a and 4c so as to give the aerial insulation distance also in a vertical direction.

Description

technical field [0001] The invention relates to a gas insulated switching device, which is composed of an insulating sleeve connected to one end of a circuit breaker and at least two insulating sleeves connected to the other end of the circuit breaker. Background technique [0002] Generally speaking, the gas insulated switchgear constitutes a switchgear such as a circuit breaker or a disconnector in a closed container sealed with an insulating medium such as sulfur hexafluoride gas. With the help of the excellent electrical insulation performance of the insulating medium, Compared with air-insulated switchgears, it can be configured with a structure that is extremely small and has excellent environmental resistance. However, in a structure in which insulating bushings are used for the insulating lead-out part of the gas insulated switchgear, and at least three insulating bushings are arranged relatively close together, for example, a double busbar method or a ring busbar me...

AI Technical Summary

Problems solved by technology

However, in a structure in which insulating bushings are used for the insulating lead-out part of the gas insulated switchgear, and at least three insulating bushings are arranged relatively close together, for example, a double busbar method or a ring busbar method or a 1.1 / 2 circuit breaker method , In the structure where each insulating bushing is arranged in any imaginary vertical plane, although the gas insulated switchgear is miniaturized, it is necessary to ensure that the air terminals at the head of each insulating bushing are roughly determined according to the system voltage. The air insulation distance cannot effectively miniaturize the gas insulated switchgear

For example, when gas-insulated switching devices are used in substations with air-insulated power supply lines or air double busbars, three insulating sleeves are used to connect the power supply lines or air double busbars together. The necessary air insulation distance is ensured between the air terminals at the head of the tube, but there is an imbalance between the air insulation distance between the part formed in the airtight container sealed with the insulating medium and the above-mentioned insulating sleeve

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