What kind of transmission line has a couple of these boxes hanging from the wires? What is this for? Today Shenzhen Dingxin wisdom to give you the answer.
The professional term for this device is called transmission line distributed fault diagnostic device, which can locate the fault point on the line and distinguish the type of fault. But in the strict sense, the figure on this device is only a part of the transmission line distributed fault diagnostic device, you can call it a monitoring terminal. The other part is called data monitoring center platform, which is used to analyze, display and store line fault information.
Let's first look at the monitoring terminal, which is usually installed on the conductor of the transmission line, through the high-voltage induction of power and more than one, usually three. Because the device adopts traveling wave ranging technology, it can collect the fault traveling wave signals on the line, but due to the attenuation and distortion of traveling wave propagation on the transmission line, when the traveling wave propagation exceeds 20 km or more, it may cause the steepness of the wave head to slow down, and the characteristics of the wave head to change or disappear, which will affect the results of fault diagnosis. Therefore, a distributed arrangement can improve the accuracy of fault localization.
The monitoring center is mainly responsible for data analysis and can be logged in through cell phones, tablets, computers and other devices. The monitoring center will comprehensively analyze the data collected by the monitoring terminals, which can not only accurately calculate the location of the fault point, but also identify the type of faults such as lightning strike, tree obstruction, wind deviation, and so on, based on the characteristics of the fault waveform. For example, the traveling wave current of lightning strike fault has a steeper wave head and a shorter wave head time, which is generally microseconds; the falling edge of the wave head of tree obstruction is very slow, and the rising edge of the wave head is steeper than that of other high-resistance grounding faults, and there is intermittent flashing before the main peak of the discharge; and the rising edge of the main wave of the wind-biased discharge is steeper, and the wave head time is small, with a long half-peak time, and so on.
In addition, the data interaction between the monitoring terminal and the monitoring center is realized through wireless networks such as 4G/5G/WIFI, which makes the data transmission fast and efficient, and also allows encrypted transmission. It is beneficial to greatly shorten the fault patrol time and improve the emergency efficiency of transmission line fault repair!
