In this study, we developed a wireless heat variation detection system that can measure the temperature difference
between the molded case circuit breaker (MCCB) and magnetic contactor (MC) of the motor control center (MCC), collect
data, and monitor the heat variation of the MCC connection. Thus far, we have developed a temperature controller and
applied a multi-communication technique based on Bluetooth Low Energy between the repeater and temperature controller
between the MCCB and MC. Furthermore, we designed the measured temperature data to be transmitted to the cloud server
via a gateway. To verify the functionality and performance of the developed wireless heat variation detection system, we
initially installed 1 gateway for communication with the MCC server, 4 sets of 4 types of temperature controllers in
Repeater 1, 12 sets of 4 types of temperature controllers in Repeater 2, and 6 sets of 4 types of temperature controllers
in Repeater 3. Then, we conducted an experiment to periodically monitor the temperature at 12 locations of the MCCB
and MC terminal connections in real-time. This developed device can be applied not only to the MCC but also to the power
distribution system using the MCCB and MC. This will contribute to the prevention and management of electrical fire
accidents caused by heat variation that can occur because of poor contact, overcurrent, and abnormal current
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