Railway HV Equipment Box Vertical Clearance Design
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Solution Overview
Problem
High voltage equipment boxes in rail vehicles do not meet the requirements for high altitude operations due to insufficient clearance and reduced external insulation strength, as well as the need to withstand harsh environmental conditions such as sand wind and low temperatures.
Innovation Solution
A high voltage equipment box design with increased size, oblique avoidance gaps, and specific mounting structures that extend the box body to above the vehicle's bottom beams, incorporating a main framework with hollow profiles and aluminum alloy plates for enhanced strength and sealing, along with cable clamps and filters for improved sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clearance for electric equipment is increased to meet overvoltage level OV4 requirements, then the insulation strength and safety are improved, but the equipment box size increases and space utilization deteriorates
Solution Approach 1:
The patent repositions the equipment box vertically by extending its top above the bottom beams and integrating its bottom with the vehicle body bottom plate, utilizing the height dimension to achieve required clearance without increasing horizontal footprint. This dimensional transition resolves the contradiction between insulation requirements and space utilization.
Solution Approach 2:
The equipment box is designed to serve multiple functions: it houses electric equipment, provides structural support as part of the vehicle body framework, and contributes to the bottom plate structure. This multi-functionality allows the box to meet insulation requirements while efficiently using available space.
2Object-affected harmful factors
If the equipment box size is increased to provide sufficient clearance, then the overvoltage protection capability is improved, but the vehicle body space utilization deteriorates
Solution Approach 1:
The patent transitions from horizontal space expansion to vertical positioning by extending the box top above bottom beams and integrating the bottom with the vehicle body plate, achieving required clearance in the vertical dimension while maintaining efficient horizontal space utilization.
Solution Approach 2:
The equipment box is merged with the vehicle body structure through integration with bottom beams and the bottom plate, creating a unified structure that provides both overvoltage protection and efficient space utilization without requiring separate dedicated spaces.
3Reliability
If the box body is extended above the bottom beams, then the clearance and insulation strength are improved, but the structural complexity increases
Solution Approach 1:
The extended box body serves dual purposes: it provides the required clearance for insulation and simultaneously acts as a structural component integrated with the vehicle body framework, eliminating the need for separate structural elements and reducing overall complexity.
Solution Approach 2:
The equipment box is combined with the vehicle body structure through integration points with bottom beams and the bottom plate, creating a unified structure that achieves clearance requirements without adding independent complex support systems.
Data Source
AI summary
A high voltage equipment box for a rail vehicle includes a box body and electric equipment arranged in the box body, two ends of the box body in a width direction of the vehicle extend to respective skirt plates, and an avoidance gap is provided at a bottom of each of the two ends of the box body, a bottom of each of the skirt plates is fixed at the respective avoidance gap, a top of the box body extends to a position above a bottom beam of a vehicle body, and a bottom of the box body is flush with a bottom plate of the vehicle body and forms a part of the bottom plate of the vehicle body.