Currently, in Vietnam, the management and operation of the power system face challenges and difficulties due to complex terrain conditions, natural disasters, floods, and typhoons. In addition to the power grid failures caused by natural disasters that damage the power system. The power grid failures caused by humans are serious and directly affect human life. Power outages that disrupt the supply of electricity have had an enormous impact on the economy, politics, and energy security. The cause of fatal power grid failures is a lack of understanding and subjectivity. With the continuous development of electronic devices, wireless communication technology will serve as the basis for the construction of applications that protect electrical systems and human life at a cheap and effective cost. In this paper, the authors built a device that can detect, warn, and prevent climbers from climbing high-voltage towers using Arduino UNO, the HC SR04 distance sensor. When the device detects an intruder, the system will ring an alarm, activate the anti-intrusion mechanism, and send SMS via GSM SIM 800I to the operator of the grid to promptly have a suitable treatment solution.