Heat Radiator for Solid Insulated Switchgear Units
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Solution Overview
Problem
Conventional high-voltage pull-through cable branch units in railway vehicles lack effective heat dissipation and switching functions, leading to high thermal resistance and poor workability during attachment.
Innovation Solution
A heat radiator for solid insulated switchgear units with a metal heat radiation member, a solid insulation housing, and a bolt-fastening mechanism that reduces thermal resistance and improves attachment efficiency by securely connecting to the bushing conductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the connection conductor is inserted into the connection portion connected to the main circuit conductor, then heat transmission is achieved, but the tight contact is weak and thermal resistance is high
Solution Approach 1:
A pressing member is introduced as an intermediary component between the connection conductor and the connection portion. This pressing member applies pressing force to the connection conductor, ensuring tight contact with the connection portion while reducing thermal resistance. The intermediary component resolves the contradiction by providing mechanical pressure without requiring direct insertion of the connection conductor into the connection portion.
2Reliability
If an insulation flange having the interface connection portion is fixed with plural bolts, then secure connection is achieved, but attaching workability is degraded
Solution Approach 1:
The connection structure is segmented into separate functional components: the connection portion integrated into the insulation flange, the connection conductor, and the pressing member. This segmentation allows the connection conductor and pressing member to be attached independently without requiring multiple bolts, thereby improving attaching workability while maintaining connection security through the pressing force mechanism.
Solution Approach 2:
The bolt-fastening mechanism is extracted from the traditional multi-bolt insulation flange design. Instead of using multiple bolts to secure the connection, the invention uses a pressing member that applies localized pressing force. This extraction of the fastening mechanism simplifies the attachment process and improves workability while maintaining reliable electrical and thermal connection.
3Temperature
If the heat releasing member is directly connected to the main circuit, then temperature rise is suppressed, but the structure becomes complex requiring multiple components
Solution Approach 1:
The connection conductor is designed to serve dual functions: electrical connection to the main circuit and thermal conduction to the heat releasing member. By merging these two functions into a single component, the structure is simplified while still achieving effective heat dissipation. The connection conductor acts as both an electrical conductor and a thermal pathway, reducing the need for separate connection and heat dissipation components.
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
The solution effectively reduces thermal resistance and enhances workability by efficiently transmitting heat from the main circuit conductor to the heat radiator, suppressing temperature rise and simplifying the attachment process.
Implementation Method 1
the heat is conducted so as to suppress the temperature rise in the main circuit conductor
Implementation Method 2
a heat radiation member of metal material, having a connection part with a bolt through hole
Data Source
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Figure 4
AI summary
A heat radiator for a solid insulated switchgear unit reduces thermal resistance in a connection part between a main circuit conductor and a heat radiator, and improves attachment workability. The heat radiator, attached to a bushing conductor of the solid insulated switchgear unit, includes: a heat radiation member of metal material having a connection part with a bolt through hole; a housing of solid insulation material having a head part in which the bushing conductor is inserted and an insulation plug insertion part in which the insulation plug is inserted; and a bolt which fastens the heat radiation member to the bushing conductor. The insulation plug insertion part and the head part communicate with each other. The bolt is inserted from the insulation plug insertion part side, through the bolt through hole of the connection part projected to the inside of the head part.