Current Transformer Bushing Assembly for Front Terminal Access
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Solution Overview
Problem
Conventional switchboards require disassembly of the current transformer bushing to expose the current transformer terminal for maintenance, making it inconvenient and increasing assembly time due to separate assembly processes and large front-rear length.
Innovation Solution
A bushing-coupled current transformer design where the current transformer bushing has an opening to expose the terminal in the front direction, allowing direct access without disassembly, and is fastened to the current transformer, reducing assembly complexity and length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current transformer bushing is designed as a separate component that must be disassembled for terminal access, then the insulation and shielding performance are improved, but the ease of operation for maintenance and the assembly time deteriorate
Solution Approach 1:
The current transformer is nested within the current transformer bushing structure, with the bushing forming an outer shell that provides insulation and shielding while containing the transformer. This nested configuration allows the terminal to be accessible from the front through the bushing structure, eliminating the need for disassembly while maintaining protective functions.
2Ease of manufacture
If the current transformer and bushing are assembled separately, then the manufacturing flexibility is improved, but the device complexity and assembly time increase
Solution Approach 1:
The current transformer and current transformer bushing are merged into a single integrated assembly where the bushing serves dual functions as both an insulating component and a mounting structure for the transformer. This combination reduces the number of separate parts and simplifies the assembly process while maintaining manufacturing flexibility.
3Reliability
If the current transformer is positioned at the rear portion of the switchboard, then the insulation performance is improved, but the ease of operation for maintenance deteriorates
Solution Approach 1:
The terminal of the current transformer is made accessible through the front direction by utilizing the vertical and lateral dimensions of the bushing structure. The opening in the bushing allows front-access to the terminal without moving the transformer to the front portion of the switchboard, thus maintaining rear-positioning for insulation while enabling front-maintenance.
Data Source
AI summary
A switchboard is provided via a terminal bushing; a switchboard terminal coupled to the terminal bushing; a metering transformer bushing which is installed or released from the front part thereof through a breaker chamber, covers the switchboard terminal, and is inserted into the terminal bushing; and a metering transformer which is fastened to the metering transformer bushing and disposed on the outer circumference of the metering transformer bushing. The metering transformer includes at least one terminal that faces forward, and the metering transformer bushing may include an opening for exposing the at least one terminal to the front thereof.