Switchgear Detection Switch Assembly for Airtight Compact Compartments
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Solution Overview
Problem
Conventional switchgear and controlgear designs face issues with non-uniform electric field distribution due to sharp corners on conductive units and busbars, leading to larger compartment volumes and compromised airtightness during maintenance or terminal replacement.
Innovation Solution
The switch assembly positions detection unit terminals outside the compartment, uses rounded or chamfered conductive bushings and busbars, and incorporates bumpers and elastic conductive units to maintain airtightness and uniform electric field distribution, allowing for compact and environmentally friendly designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conductive units are made thin with sharp corners for ease of insertion into clamps, then ease of operation is improved, but the spacing between phases and walls must be increased, leading to larger compartment volume
Solution Approach 1:
The patent replaces sharp-cornered conductive units with rounded or curved conductive elements. The conductive units are designed with curved surfaces instead of sharp corners, which eliminates the need for large clearance distances while maintaining ease of insertion and operation. This curvature principle directly resolves the contradiction by allowing compact spacing without compromising operational ease.
2Ease of manufacture
If terminals of detection unit are arranged inside the airtight compartment for conventional connection, then electrical connection is achieved, but replacement of terminals affects the airtightness of the compartment
Solution Approach 1:
The patent divides the system into two separate segments: the airtight compartment containing the circuit breaker, and the external detection unit with its terminals. The conductive units act as isolated connectors that can be replaced without breaching the compartment seal. This segmentation allows independent maintenance of terminals while preserving the integrity and airtightness of the enclosed compartment.
Solution Approach 2:
The conductive units serve as intermediary elements between the internal circuit breaker terminals and the external detection unit terminals. These intermediaries can be replaced or adjusted from the outside without requiring access to or disruption of the airtight compartment interior, thus maintaining compartment seal integrity while enabling electrical connection modifications.
3Ease of manufacture
If sharp corners are present on conductive units and busbars, then manufacturing is simplified, but charge accumulates at sharp corners requiring larger spacing, increasing compartment volume
Solution Approach 1:
The patent applies curved or rounded surfaces to conductive units and busbars instead of sharp corners. This design choice eliminates charge accumulation points while maintaining manufacturing feasibility through modern forming processes. The curved geometry provides sufficient creepage and clearance distances without requiring increased compartment volume, thus resolving the contradiction between manufacturing simplicity and compact size.
4Reliability
If larger spacing is provided between phases and walls to accommodate sharp corners and charge accumulation, then reliability is improved, but compartment volume increases
Solution Approach 1:
By using curved conductive elements instead of sharp-cornered ones, the patent achieves reliable electrical insulation with reduced spacing requirements. The curved surfaces distribute electric field stress uniformly, preventing charge accumulation and providing adequate insulation distance in a more compact configuration. This resolves the contradiction by maintaining insulation reliability while minimizing compartment volume.
Data Source
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AI summary
Embodiments of the present disclosure provide a switch assembly for a detection unit of a switchgear or controlgear. The switch assembly comprises a shaft rotatably arranged between opposite side walls of a compartment for accommodating an electrical component, the electrical component coupled to at least one connecting busbar of the switchgear; at least one conductive unit, each conductive unit being rotatable about the shaft between an open position and a close position; and at least one coupling mechanism arranged in the compartment and configured to electrically couple the conductive unit to the detection unit, wherein each coupling mechanism is electrically coupled to the respective connecting busbar when the conductive unit is in the close position, and is electrically decoupled from the respective connecting busbar when the conductive unit is in the open position and is grounded, and wherein each coupling mechanism comprises a connecting unit for receiving a terminal of the detection unit positioned outside the compartment. In this way, maintenance or replacement of the detection unit will not affect the airtightness of the compartment. Furthermore, the connecting unit can also be used to receive the terminal of other kind of detection unit, such as terminals of test assemblies.