HV Interface Lever Assembly for Cable Presence Detection
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Solution Overview
Problem
Conventional high voltage electrical interfaces fail to prevent unsafe conditions when high voltage cables are not installed, as the lid switch allows power to be applied even if the interface cover is in place but the cables are missing.
Innovation Solution
Incorporating a lever assembly within the interface module that detects the presence of high voltage lines, preventing the cover from being fully installed and thus blocking the power application to the HV circuit unless the lines are properly positioned, ensuring the HV interlock loop switch is closed only when the lines are correctly installed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lid switch is used to detect the presence of the interface cover, then power is prevented from being applied when the cover is not in place, but power may still be applied when the cover is in place but the HV cables are not installed
Solution Approach 1:
The interlock system is segmented into multiple independent detection mechanisms: the lid switch detects cover presence, while the lever assembly detects cable installation status. Each component performs a specific safety function, and together they provide comprehensive protection without requiring a single complex interlock mechanism.
Solution Approach 2:
The lever assembly performs preliminary detection of cable installation status before the lid switch can effectively protect the circuit. By requiring cables to be installed before the cover can be properly secured, the system ensures that safety conditions are met in advance of power application.
2Ease of operation
If the lid switch allows power application when the cover is in place, then ease of operation is improved, but unsafe conditions exist when cables are not installed
Solution Approach 1:
The lever assembly acts as an intermediary mechanism between the cable installation state and the power application state. It translates the physical presence or absence of cables into a mechanical position change that directly controls the interlock switch, providing a clear and reliable safety barrier.
Solution Approach 2:
The lever assembly is a passive, self-actuating mechanism that automatically detects cable installation through the natural insertion process. The cables themselves perform the detection function by physically moving the levers into their proper positions, eliminating the need for active sensing or complex control systems.
Data Source
AI summary
A high voltage (HV) interface housing is provided that includes an assembly of levers within the housing that detect whether or not the HV lines are coupled to the interface housing. If the HV lines are not in place, the lever assembly prevents the interface cover from being fully installed onto the interface housing, thereby preventing the HV interlock loop switch from being closed. As a result, when the HV cables are not in place, the HV interlock loop switch prevents power from being applied to the HV circuit. If, however, the HV lines are properly positioned within the interface housing, the levers of the lever assembly automatically retract, thus allowing the interface cover to be fully installed onto the interface housing. In this state, the interface cover closes the HV interlock loop switch, thus closing the HV interlock loop and allowing power to be applied to the HV circuit.