Gas-Insulated Switchgear Miniaturization via Orthogonal Movable Contactor
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Solution Overview
Problem
Conventional gas-insulated switchgears face challenges in miniaturization and assembly property, with larger gas container diameters required for miniaturization and compromised assembly properties when reducing device dimensions.
Innovation Solution
A gas-insulated switchgear design featuring a main bus-bar conductor with two longitudinal openings and one orthogonal opening, utilizing insulation spacers to support a movable contactor and detachable unit, allowing for orthogonal disconnector and earthing switch configurations and improved centering adjustments, enabling miniaturization and enhanced assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the movable contactor is disposed parallel to the bus-bar conductor with off-centered configuration, then the insulation spacer can be mounted, but the gas container requires larger outer diameter
Solution Approach 1:
The movable contactor is disposed at a predetermined angle relative to the bus-bar conductor axis rather than parallel, utilizing angular orientation in three-dimensional space. This dimensional change allows the contactor to fit within the constraints of the insulation spacer and gas container, achieving both compact size and proper mounting configuration.
Solution Approach 2:
The movable contactor is positioned asymmetrically at a specific angle rather than in a symmetric off-centered position. This asymmetric angular disposition optimizes the use of available space within the gas container while maintaining the necessary insulation distances and mounting capabilities.
2Volume of stationary object
If the movable contactor is disposed at an angle to reduce gas container diameter, then the container size is reduced, but centering adjustment becomes difficult
Solution Approach 1:
The movable contactor is pre-positioned at the predetermined angle relative to the bus-bar conductor axis during the design and manufacturing stage. This preliminary angular positioning eliminates the need for complex centering adjustments during final assembly, as the components are already oriented correctly for optimal fit and function.
3Reliability
If independent movable contactors are provided for disconnector and earthing switches, then position holding function is achieved, but the gas container diameter increases
Solution Approach 1:
A single movable contactor is used to serve both the disconnector switch and the earthing switch, combining the functions that would otherwise require separate contactors. This merging approach maintains the position holding function through proper mechanical design while significantly reducing the space required within the gas container.
Solution Approach 2:
The movable contactor is designed with multi-functionality, capable of operating in conjunction with both the disconnector switch and the earthing switch. This universal component performs multiple functions that would traditionally require separate dedicated contactors, thereby compacting the overall device size.
Data Source
Figure 1A~1B
Figure 2~3
Figure 4
AI summary
In a gas-insulated switchgear, one end portion of a main bus -bar conductor is fixed to a first insulation spacer while a lower end portion is formed to be connectable to a detachable conductor, and in a center portion, a disconnector switch fixed contact portion is formed to be orthogonal to a longitudinal direction of the main bus-bar conductor. A movable contactor supporting conductor is fixed by a second insulation spacer mounted to the gas container on an axis orthogonal to an axis of the first insulation spacer. An earthing switch fixed contact portion is disposed behind a movable contactor as seen from the disconnector switch fixed contact portion. The detachable conductor is fixed by a third insulation spacer disposed in a position facing the first insulation spacer.