Sensing and alert system for electrical switchgear
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.
1. A sensing and alert system for a plurality of electrical switchgear cabinets, each switchgear cabinet including at least one high-voltage circuit breaker, and each switchgear cabinet 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 comprising:
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;
a processor operatively coupled to the ToF sensor and to the lighting module; the sensing and alert system affixed to an inside portion of each switchgear cabinet so that the ToF sensor is in direct line-of-sight of an inside portion of a door of the cabinet, wherein the ToF sensor provides data for determining if the door of the switchgear cabinet is open or closed, and the lighting module is positioned so as to illuminate an inside portion of the cabinet when activated;
the processor configured to receive the real-time image data from the ToF sensor and compare the real-time image data with stored calibration image data, wherein if the real-time image data differs from the stored calibration image data by more than a predetermined amount, the processor transmits an alarm signal to the central PLC, and activates the lighting module; and
wherein, the central PLC, upon receipt of the alarm signal from the processor, deactivates the at least one high-voltage circuit breaker in the corresponding switchgear cabinet.
2. The system according to claim 1 , wherein the lighting module, the processor, and the ToF sensor receive power from a 24 volt DC power source provided within each electrical cabinet.
3. The system according to claim 1 , wherein the ToF sensor is a Polytec epc610 camera module.
4. The system according to claim 1 , wherein the central PLC controls the high-voltage circuit breakers in a plurality of electrical switchgear cabinets.
5. The system according to claim 1 , wherein after the processor turns on the lighting module of a selected electrical cabinet, the lighting module remains activated until a predetermined time after the processor determines that the real-time image data is not different than the stored calibration image data by more than a predetermined amount.
6. The system according to claim 1 , wherein the sensing and alert system is attached magnetically to an inside portion of the switchgear cabinet so as to comply with Underwriters Laboratory (UL) requirements for electrical switchgear cabinetry.
7. The system according to claim 1 , further including two ToF sensors disposed in each electrical cabinet for redundant operation.
8. The system according to claim 1 , wherein the lighting module includes a plurality of high-intensity LED lamps.
9. The system according to claim 1 , wherein the stored calibration data corresponds to the inside portion of the cabinet door when the door is in a closed position.
10. The system according to claim 1 , wherein the processor determines that the switchgear cabinet is open if the real-time image data differs from the stored calibration image data by more than a predetermined amount.