Bushing Conductor Extractor for Dead Tank Circuit Breakers
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Solution Overview
Problem
The existing methods for removing an interrupter from a dead-tank circuit breaker are cumbersome and risky due to the heavy and cumbersome nature of the bushings, which require safe tilting and pose electrical hazards.
Innovation Solution
An extractor comprising a supporting member secured to the bushing insulator and a movable member secured to the bushing central conductor, with lifting means that allow for safe extraction of the conductor without removing the insulator shell, reducing the risk of damage and electrical hazards by lifting only a small portion of the conductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the entire bushing is removed from the tank for interrupter extraction, then the interrupter can be accessed, but the bushing becomes difficult to handle and poses electrical hazards
Solution Approach 1:
The invention divides the bushing into two separate parts: the insulator shell that remains in the tank and the central conductor that is extracted. This segmentation allows the conductor to be removed for interrupter access while the insulator shell stays in place, eliminating the need to handle the entire heavy bushing and reducing electrical hazards associated with removing the complete assembly.
2Ease of operation
If the heavy bushing is removed for interrupter access, then the interrupter can be extracted, but the bushing requires constant tilting and safe handling
Solution Approach 1:
By segmenting the bushing into the stationary insulator shell and the extractable central conductor, the invention eliminates the need for complex tilting and handling procedures. Only the lighter conductor needs to be manipulated, while the heavy insulator shell remains fixed in the tank, significantly simplifying the extraction process.
3Ease of operation
If the entire bushing is extracted, then the interrupter can be removed, but the risk of damage to the bushing increases
Solution Approach 1:
The segmentation of the bushing into the stationary insulator shell and the movable central conductor protects the insulator shell from damage. Only the more robust conductor is extracted and reinserted, while the insulator shell remains securely in the tank, maintaining its structural integrity and reducing the risk of accidental damage.
Solution Approach 2:
The invention prepares the connection between the conductor and insulator shell in advance by providing a threaded interface. This preliminary preparation allows for safe and controlled extraction and reinsertion of the conductor without applying excessive force to the insulator shell, thereby protecting it from damage.
4Ease of operation
If the bushing conductor is fully extracted, then the interrupter can be accessed, but electrical hazards increase due to exposed conductor
Solution Approach 1:
By separating the conductor from the insulator shell, the invention allows controlled extraction of only the necessary portion of the conductor for interrupter access. The insulator shell remains in place to provide electrical insulation, thereby reducing the electrical hazards that would exist if the entire bushing assembly were removed or if excessive conductor length were exposed.
Data Source
AI summary
An extractor for at least partially extracting a bushing central conductor from a bushing insulator. The extractor comprises a supporting member, a movable member and lifting means. The supporting member is configured to be rigidly secured to the bushing insulator. The movable member is configured to be rigidly secured to the bushing central conductor. The lifting means are configured to move the movable member along the supporting member.