Draw-Rod Bushing Sealing Plug for Transformer Liquid Isolation
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Solution Overview
Problem
Conventional draw-rod systems in bushings connected to liquid-filled electrical devices, such as transformers, allow insulation liquid to enter the conductor tube, increasing the risk of leakage and potentially catastrophic fires, especially when the bushing is arranged between a transformer tank and a valve hall.
Innovation Solution
A bushing design featuring a concentric support tube and draw-rod system with a sealing plug that prevents liquid from entering the conductor tube by sealingly engaging the inside wall, allowing the use of a draw-rod system for easy mounting without manual entry into the electrical device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional draw-rod system is used to connect the bushing to the electrical device, then the mounting process becomes simpler and faster, but insulation liquid can enter the conductor tube increasing leakage risk
Solution Approach 1:
The contact arrangement is divided into separate functional components: a draw-rod for mounting operations, a contact element for electrical connection, and a sealing plug for liquid prevention. This segmentation allows the draw-rod to be removed after mounting, leaving the sealing plug in place to prevent liquid entry while maintaining the simplified mounting benefit
Solution Approach 2:
The sealing function is extracted as a separate sealing plug component that can be independently positioned and secured within the conductor tube. This extracted sealing element prevents liquid entry while the draw-rod serves only its temporary mounting purpose and can be removed
2Reliability
If the bushing is sealed to prevent liquid leakage, then safety is improved, but a manhole is required for manual connection increasing device complexity
Solution Approach 1:
The contact arrangement is designed to be self-installing through the draw-rod mechanism. When the draw-rod is pulled during mounting, it automatically draws the contact element and sealing plug into the conductor tube, where they self-position and secure themselves without requiring manual entry through a manhole
Solution Approach 2:
The sealing plug and contact element are pre-assembled with the draw-rod as an integrated unit. This preliminary assembly ensures that when the draw-rod is pulled during mounting, the sealing components are already in their correct relative positions and will be properly installed into the conductor tube without manual intervention
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
Prevents insulation liquid from entering the conductor tube, reducing the risk of leakage and facilitating quicker and easier mounting of the bushing, while maintaining the functionality of the draw-rod system, thus enhancing safety and operational efficiency.
Implementation Method 1
a sealing plug (28) arranged for sealingly engaging an inside wall of the conductor tube (20) to prevent liquid from passing the sealing plug (28) into the conductor tube
Data Source
AI summary
The present disclosure relates to a bushing comprising a conductor tube, a support tube, arranged within the conductor tube, a draw-rod configured to run through the support tube, and a contact arrangement arranged to be drawn into the conductor tube by the draw-rod. The contact arrangement comprises a sealing plug arranged for sealingly engaging an inside wall of the conductor tube to prevent liquid from passing the sealing plug into the conductor tube.