Switchgear Joint Enclosure for Arc Containment
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Solution Overview
Problem
Arcs in electrical switchgear can move and cause destruction, particularly at joints where they can weld busbars together, making repairs complicated and requiring extensive disassembly.
Innovation Solution
A joint enclosure within the switchgear housing provides protection against objects ≥ 2.5 mm, specifically IP3XD, keeping arcs away from busbar joints and allowing for easier repairs by preventing welding and minimizing the need for extensive disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If barriers are installed between separate switchgear sections to prevent arc movement, then arc straying is avoided, but the arc movement is hindered at the joint location causing welding of busbars
Solution Approach 1:
The switchgear housing is divided into multiple arc-resistant sections, each with its own arc barrier. The joint enclosure creates a segmented protected space around the busbar joint, isolating it from arcs originating in other sections while maintaining the segmented structure's electrical connectivity function
Solution Approach 2:
A joint enclosure acts as an intermediary protective structure between the busbar joint and the external environment. This enclosure with IP3XD protection serves as a mediator that allows electrical connectivity while preventing direct arc contact with the joint, resolving the conflict between maintaining joint accessibility and protecting from arc damage
2Ease of operation
If busbar joints are exposed to arcs to maintain electrical connectivity, then electrical function is preserved, but the joints can be welded together making repairs complicated
Solution Approach 1:
The joint enclosure is installed beforehand to provide protective coverage for the busbar joint. This preliminary protective action ensures that when arc events occur, the joint is already protected, preventing welding and maintaining ease of repair without requiring redesign or additional protective measures after arc damage occurs
Solution Approach 2:
The joint enclosure serves as a sacrificial protective element that can be replaced if damaged, while the expensive busbar joint itself remains protected and reusable. This approach protects the critical permanent connection while allowing replacement of the protective enclosure if needed
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The joint enclosure effectively contains arcs, reducing the risk of ignition and allowing busbar joints to remain unfastened after an arc event, facilitating maintenance and repair without uninstalling equipment.
Implementation Method 1
the joint enclosure can provide protection of at least code IP3XD of IEC standard 60529... providing protection against objects having a diameter ≥ 2.5 mm
Implementation Method 2
the switchgear housing can provide protection against a surrounding environment of at least code IP2X of IEC standard 60529
Data Source
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AI summary
An electrical switchgear (1) is disclosed, which comprises a switchgear housing (3) providing protection against a surrounding environment (A) against objects having a diameter ≥ 12.5 mm and in particular of at least code IP2X of IEC standard 60529 and which comprises a number of busbars (4) within the switchgear housing (3), wherein at least two of them are interconnected by means of a joint (6a, 6b). According to the proposed measures, the joint (6a, 6b) is surrounded by a joint enclosure (7a..7c) within said switchgear housing (3) providing protection against objects having a diameter ≥ 2.5 mm and in particular of at least code IP3XD of IEC standard 60529.