Gas-Insulated Switchgear Bushing Layout for Flexible Lead-In Direction
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Solution Overview
Problem
Conventional gas-insulated switchgear structures face challenges in ensuring insulation distances between bushings when the power receiving lead-in direction changes, requiring structural modifications and limiting flexibility in installation orientations.
Innovation Solution
The gas-insulated switchgear features bushing tanks with a hemispherical upper surface, where three-phase power receiving bushings are disposed at equal intervals in a circumferential direction, inclined outward, and one bushing is aligned along the front-rear direction, ensuring insulation distances without depending on the power receiving lead-in direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bushings are arranged in a line to ensure insulation distances, then the insulation distances are maintained, but the power receiving lead-in direction cannot be easily changed
Solution Approach 1:
The bushing tank upper surface is formed as a hemispherical portion, allowing bushings to be disposed at equal intervals in the circumferential direction. This curved geometry enables flexible orientation of bushing end portions while maintaining proper insulation distances regardless of the power receiving lead-in direction.
Solution Approach 2:
The bushings are configured with asymmetric orientations where end portions are inclined outward to be separated from each other, with one bushing disposed along the front-rear direction. This asymmetric arrangement ensures insulation distances are maintained while adapting to different lead-in directions without structural modifications.
2Reliability
If the bushing structure is designed according to specific installation orientation, then the insulation distances are ensured, but it requires redesign when installation orientation changes
Solution Approach 1:
The hemispherical bushing tank upper surface provides a universal configuration that can accommodate different power receiving lead-in directions without requiring redesign. The bushings disposed at equal intervals on the hemispherical surface can be oriented in multiple directions while maintaining insulation distances, making the structure adaptable to various installation orientations.
3Volume of moving object
If the bushings are arranged with end portions close together to reduce space, then the structure is compact, but insulation distances cannot be ensured when lead-in direction changes
Solution Approach 1:
The hemispherical upper surface of the bushing tank allows bushings to be disposed with end portions inclined outward while maintaining adequate insulation distances. The curved geometry provides sufficient spacing between bushings in a compact configuration, ensuring reliability regardless of lead-in direction.
Data Source
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AI summary
A bushing tank (1) having power receiving lead-in bushings (11) of three phases to which conductor portions (6) extended rearward of a main body portion (10) in which a switching device is housed are connected is included, and the power receiving lead-in bushings (11) of the three phases are disposed at an upper surface portion (1a) of the bushing tank (1) at equal intervals in a circumferential direction such that end portions thereof are inclined outward so as to be separated from each other, and one of the power receiving lead-in bushings (11) of the three phases is disposed along a front-rear direction of the main body portion (10). Owing to this configuration, it is possible not only to ensure insulation distances between the end portions of the power receiving lead-in bushings (11) but also to ensure insulation distances between lead-in wires regardless of a power receiving lead-in direction.