HYTBB series low-voltage reactive power comprehensive compensation device is suitable for distribution transformers, low-voltage lines, or other outdoor low-voltage power distribution systems, to realize automatic reactive power tracking compensation. The device integrates reactive power compensation optimization and power monitoring, and adopts a combination of fixed compensation and dynamic compensation. It can track the running state of the power grid in real time, has smooth compensation performance, and has the best compensation effect. The system can effectively compensate the reactive power of the line, ensure the stability of the power factor, reduce the loss of the line, improve the utilization rate of the transformer and the transmission line, and improve the load end. Power supply quality and power monitoring are rich in content, including three-phase voltage, current, power factor, active power, temperature and many other parameters. It provides an effective analysis method for monitoring the operation of the power grid. The device has the function of capacitor current measurement, which provides a monitoring basis for the operation status of the capacitor during long-term operation. The system is equipped with powerful background management software, which can perform multiple data analysis on the measurement results of the control cabinet.