Switchgear Blade Rotation and Busbar Redundancy
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Solution Overview
Problem
Conventional switchgear with a double busbar structure faces operability issues due to the need for simultaneous operation of busbar disconnectors from both sides, leading to increased height or width, and interference between rotating blade switches, making it difficult to downsize and install in narrow spaces.
Innovation Solution
The switchgear design allows for non-interfering blade rotations by arranging three-position switches with planes of rotation parallel to the front face, enabling reduced spacing and observation through front-side viewports, thus downsizing the switchgear and allowing installation in confined areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If busbar disconnectors are operated from both front and back sides in a conventional double busbar structure, then redundancy is achieved, but operability deteriorates because operations cannot be performed simultaneously
Solution Approach 1:
The patent merges both busbar disconnectors into a single integrated unit with a common operation shaft. The front-side busbar disconnector and rear-side busbar disconnector share the same rotational mechanism, allowing simultaneous operation from the front side only. This combining approach maintains the redundancy function while eliminating the need to access both front and back sides for operation.
2Ease of operation
If two sets of three-phase busbar disconnectors are arranged one above the other in the vertical direction, then operability is improved, but the height of the switchgear increases
Solution Approach 1:
The patent transitions from vertical stacking to horizontal/depth arrangement by utilizing the anteroposterior dimension. The front-side busbar disconnector and rear-side busbar disconnector are positioned at different depths within the switchgear housing rather than stacked vertically. This dimensional reconfiguration allows both disconnectors to be operated simultaneously from the front while reducing the overall height requirement.
3Adaptability or versatility
If disconnectors with rotating blades are used, then switching functionality is achieved, but the switches require wide spaces therebetween to prevent mutual interference
Solution Approach 1:
The patent employs asymmetric blade designs where the front-side busbar disconnector blades and rear-side busbar disconnector blades are configured with different rotational planes and orientations. This asymmetry allows the rotating blades to operate in different spatial domains, preventing mutual interference while maintaining full switching functionality. The blades can rotate simultaneously without colliding because their rotational paths are deliberately made non-overlapping through asymmetric configuration.
Data Source
Figure 1
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AI summary
A switchgear (1) according to the present invention includes a disconnecting unit (3) that includes multiple switches (7) to switch electrical paths by rotation of blades, and a switch housing having a view port (13), and including the switches (7) arranged therein, wherein planes of rotation of the blades (7a) and an arrangement direction of the switches (7) intersect, and the switches (7) are arranged rearward from the view port (13)