Laminated Bus Bar Creepage Groove Insulation
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Solution Overview
Problem
Conventional laminated bus bars in electric power converters face challenges in securing high insulation performance due to insufficient creepage distance between connection terminal sections, making it difficult to meet international standards like IEC 60077-1, especially when applied to rolling stock applications.
Innovation Solution
The laminated bus bar incorporates parallel-sided creepage grooves on the edges of insulator plates, with a width of at least 2.5 mm, to elongate the creepage distance between connection terminal sections, ensuring compliance with international standards and enhancing insulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If connection terminal sections are led out in accordance with the arrangement of main circuit terminals on the semiconductor module, then the ease of connection to the semiconductor module is improved, but the creepage distance between connection terminal sections becomes insufficient
Solution Approach 1:
The insulator plate is segmented by forming grooves of creepage that divide the surface into separate regions. These grooves create distinct insulation paths between connection terminal sections, effectively segmenting the electrical field and preventing direct creepage between terminals while maintaining their spatial arrangement for easy connection.
Solution Approach 2:
The grooves of creepage act as intermediary insulation structures between the connection terminal sections. These grooves provide a controlled insulation path that mediates the electrical isolation requirement while allowing the terminals to maintain their convenient arrangement for connection to the semiconductor module.
2Reliability
If the creepage distance between connection terminal sections is increased to meet international standards, then the insulation performance is improved, but the structural complexity of the insulator plate increases
Solution Approach 1:
The insulator plate is segmented by forming grooves of creepage that divide the surface into separate regions. These grooves create distinct insulation paths between connection terminal sections, effectively segmenting the electrical field and preventing direct creepage between terminals while maintaining their spatial arrangement for easy connection.
Solution Approach 2:
The groove width is specifically controlled to be at least 2.5 mm to meet the creepage distance requirements of international standards. By changing this critical parameter, the insulation performance is enhanced without requiring complete redesign of the insulator plate structure.
Data Source
AI summary
A laminated bus bar is applied to a main wiring circuit of an electric power converter and connected to a semiconductor module. The laminated bus bar includes insulator plates laminated together, and conductors interposed between the insulator plates. Each conductor includes a connection terminal section led out in accordance with an arrangement of a main circuit terminal on the semiconductor module. A creepage groove is formed on an edge of each of the insulator plates in accordance with a position between the connection terminal sections. The laminated bus bar facilitates elongation of the creepage distance between the connection terminals.