Vacuum Contactor Bottle Clamping Structure for Fault Vibration Resistance
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Solution Overview
Problem
Medium-voltage vacuum contactors experience mechanical stresses and vibrations during fault events, leading to potential malfunction or breakage of vacuum bottles due to their loose mounting in 'assembled' types, which lack solid linkage to the insulating casing.
Innovation Solution
An accessory device with support members and clamping members is installed on the vacuum contactor to firmly hold vacuum bottles in place, using a modular structure with connectors to secure the bottles to the insulating casing, thereby resisting mechanical stresses and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If vacuum bottles are removably mounted in assembled vacuum contactors, then ease of manufacture and assembly is improved, but reliability deteriorates due to loose mounting during fault events
Solution Approach 1:
The accessory device is divided into multiple independent support members (first support member coupled to insulating casing, second support member, and multiple third support members arranged transversally), each serving specific localization functions to collectively secure vacuum bottles
Solution Approach 2:
The accessory device is pre-installed on the vacuum contactor before fault events occur, establishing a secure mechanical linkage structure in advance that prevents vacuum bottle displacement during high-current fault conditions
2Reliability
If vacuum bottles are co-moulded with insulating casing in embedded vacuum contactors, then reliability is improved, but device complexity increases
Solution Approach 1:
The accessory device acts as an intermediary component that bridges the vacuum bottles and the insulating casing, providing a secure mechanical linkage without requiring direct integration of vacuum bottles into the casing structure
Solution Approach 2:
The accessory device comprises multiple separate support members (first support member, second support member, and third support members) that can be independently installed and positioned, avoiding the need for complex co-moulding processes
3Reliability
If accessory device uses multiple support members and clamping members, then reliability is improved, but device complexity increases
Solution Approach 1:
The accessory device is segmented into functional modules: first support members coupled to insulating casings, second support members, and third support members arranged transversally, allowing distributed installation and maintenance
Solution Approach 2:
The support members serve multiple functions simultaneously: providing mechanical support, securing vacuum bottles in position, and distributing mechanical stresses during fault events, thereby reducing the need for additional specialized components
Data Source
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AI summary
An accessory device for a medium-voltage vacuum contactor, wherein said vacuum contactor comprises one or more electric poles, each comprising an open insulating casing and a vacuum bottle accommodated in an internal space defined by said insulating casing, characterised in that said accessory device comprises a first support member, a second support member, a plurality of third support members and one or more clamping members, wherein, when said accessory device is installed on said vacuum contactor: - said first support member is coupled to the insulating casing of each electric pole, at a first side of said insulating casing; - said second support member is coupled to the insulating casing of each electric pole, at a second side of said insulating casing opposite to said first side; - each third support member is placed at a lateral flank of the insulating casing of an electric pole, said third support members being arranged transversally to said first and second members and are joined to said first and second members, - each clamping member is partially accommodated in the internal space of a corresponding electric pole and is coupled to the vacuum bottle (4) of said corresponding electric pole, wherein each clamping member is joined to said second support member, when said accessory device is installed on said vacuum contactor.