ToF Sensor Lighting for Switchgear Safety
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-voltage electrical switchgear maintenance poses risks due to inadequate lighting and lack of safety warnings, particularly during re-energization, and existing solutions are difficult to retrofit into UL-compliant cabinets without violating stringent specifications.
Innovation Solution
A sensing and alert system is installed in switchgear cabinets, featuring a time-of-flight sensor, lighting module, and processor that compares real-time images with calibration data to detect door openings and trigger alarms, deactivating high-voltage circuit breakers and providing safe illumination without drilling into the cabinets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If lighting is added to switchgear cabinets to improve visibility during maintenance, then illumination intensity is improved, but device complexity increases and UL compliance becomes difficult to maintain
Solution Approach 1:
The patent combines multiple functions into a single integrated sensor system: the ToF sensor serves both as a door opening detector and as a trigger for the lighting module. By merging the detection and lighting control functions into one system, the patent improves illumination while minimizing the increase in device complexity and maintaining UL compliance through a compact, pre-approved component integration approach.
Solution Approach 2:
The ToF sensor performs multiple functions: it detects door openings, triggers lighting activation, and can potentially monitor other cabinet conditions. This multi-functionality allows the system to improve illumination and safety without requiring separate dedicated components for each function, thereby limiting the growth of device complexity.
2Reliability
If safety warning systems are installed to detect door openings and alert during re-energization, then reliability is improved, but device complexity increases due to additional sensors and control systems
Solution Approach 1:
The patent merges the door detection function and the safety warning function into a single integrated system using the ToF sensor. The same sensor that detects door openings also triggers the lighting and can alert during re-energization sequences, reducing the need for multiple separate safety components and thereby limiting complexity growth while improving reliability.
Solution Approach 2:
The system uses the existing cabinet infrastructure and integrated sensor to automatically detect door openings and trigger appropriate safety responses without requiring additional complex control systems. The ToF sensor autonomously monitors conditions and activates safety protocols, reducing the need for external monitoring equipment.
3Ease of manufacture
If drilling is performed to install sensors and lighting in existing cabinets, then ease of installation is improved, but UL compliance deteriorates as specifications prohibit drilling
Solution Approach 1:
The patent segments the sensor and lighting components into a compact integrated unit that can be mounted on existing cabinet surfaces without requiring structural modifications. This segmentation allows the system to be installed using surface-mounted techniques that comply with UL specifications while maintaining ease of installation through modular assembly.
Solution Approach 2:
The integrated sensor system uses thin-film or flexible mounting mechanisms that adhere to cabinet surfaces without requiring drilling or permanent structural changes. This approach maintains UL compliance by avoiding penetration of the cabinet enclosure while still enabling easy installation and future removal if needed.
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 system ensures safe maintenance by automatically deactivating high-voltage circuit breakers and providing adequate lighting during high-risk events, preventing electrical arcs and improving visibility without compromising UL compliance.
Implementation Method 1
a time of flight (ToF) sensor arranged to capture real-time image data
Implementation Method 2
a lighting module affixed to an inside portion of the switchgear cabinet... The lighting module is positioned so as to illuminate an inside portion of the cabinet when activated
Data Source
AI summary
A sensing and alert system is installed in a plurality of electrical switchgear cabinets. Each switchgear cabinet includes at least one high-voltage circuit breaker, and each switchgear cabinet is in communication with a central programmable logic controller (PLC) configured to activate and deactivate the high-voltage circuit breaker in the corresponding switchgear cabinet. The sensing and alert system includes a time of flight (ToF) sensor arranged to capture real-time image data, a lighting module affixed to an inside portion of the switchgear cabinet, and a processor operatively coupled to the ToF sensor and to the lighting module. The sensing and alert system is affixed to an inside portion of each switchgear cabinet. The processor compares real-time image data from the ToF sensor to the stored calibration image data and transmits an alarm if the difference is greater than a predetermined amount.