Design of Wireless Monitoring Node for Power Transformers Based on BLE

To address the issues of high data cost, large power consumption, and slow communication rate associated with the traditional wireless monitoring nodes for power transformers, this paper proposes a novel BLE (Bluetooth Low Energy) based wireless monitoring node for power transformers. BLE can meet both the high communication rate and low-power requirements for the monitoring node. Besides, the temperature sensing circuit is designed and circuit simulations are conducted to determine the proper parameters of each component in the circuit. In order to reduce the power consumption of monitoring node, an external low-power wake-up circuit is designed. Then, the working stages of the monitoring node and corresponding power consumptions are analyzed to determine the appropriate sleep time. Finally, the hardware of the proposed low-power wireless monitoring node is implemented and tested for power consumptions under different working states. The test results indicate that the monitoring node exhibits commendable attributes, including compact size, low power consumption, and remarkable efficiency, providing an effective monitoring method for transformer.