Power cables at three-phase distribution substations are particularly vulnerable to theft by unscrupulous individuals. This is because the conductors used in these power cables are made of copper, which has a high resale value. Given this situation, a power cable theft detection system was developed using the NodeMCU ESP8266 microcontroller to transmit reading data and alerts to the Arduino IoT Cloud platform, as well as to send warning messages to WhatsApp Messenger via CallMeBot when power cable theft occurs. The parameters used to detect this activity are voltage readings obtained from the PZEM-004T sensor—with an error margin of 0.0036%–0.0049%—and time data obtained from the `millis()` function on the NodeMCU. When theft occurs, the microcontroller will trigger the buzzer and send alert messages to both the Arduino IoT Cloud and WhatsApp Messenger via CallMeBot.
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