When we cast our eyes on the towering transmission towers and the transmission lines connecting them, we will find that the transmission line is not a straight line. It is in a certain distance, will show the phenomenon of the center sag, the curve formed by this sag is "arc sag". From the perspective of physical principles, it is a clever balance of gravity and tension, which shapes the unique shape of the arc of the transmission line.

  The size of the arc sag is not arbitrary, it is affected by a combination of factors. Among them, the change of temperature is a key factor. In the hot summer, the temperature rises, the transmission line will be because of the principle of thermal expansion and contraction and elongation, at this time its length increases, the self-weight also increases, the arc will be correspondingly large. On the contrary, in the cold winter, the temperature decreases, the transmission line shrinkage becomes shorter, the arc sag will also be reduced. In addition to temperature, the material properties of the transmission line, the span and the load and so on also affect the size of the arc sag. If the arc sag is too small, it is easy to break due to excessive tension. When the arc sag is too large, it may lead to short-circuit accidents due to collision and insufficient distance to ground under wind-blown conditions.

To ensure the appropriate arc sag value, so that the transmission line in a variety of complex environmental conditions can maintain good operating conditions, need for arc sag online monitoring. In view of the above situation, Shenzhen Dingxin Intelligent Technology Co., Ltd. independently developed and launched the transmission line arc sag monitoring device, that is, the transmission . rgb(255, 0, 0);">Power Line Beidou Wind Deflection Arc Sag Online Monitoring DeviceDX-BDS100-HC, utilizing high-voltage power supply as power source, mainly through the laser sensors and micropower wireless sensing technology, real-time measurement of the transmission line distance to the ground, the arc angle, the angle of the deflection and other parameters, the data through the communication network real-time data transmission to the monitoring center. The data is transmitted to the monitoring center through the communication network in real time. The device has automatic and controlled collection function, can carry out data storage, calculation and rationality check, output including wire arc sag, distance to ground and other state information, and can store more than 30 days of data to ensure the accuracy and integrity of the data, when exceeding the predetermined threshold timely warning.

The stability and safety of power transmission can be ensured by dynamic monitoring and adjustment of the arc droop.