Distribution network traveling wave fault may sound a little strange, but when we will "distribution network" and "traveling wave" combined to understand, in fact, describes the distribution line fault moment traveling wave transmission process. Lightweight floating on the water know, right? When the tip of the foot touches the water will be swung around and around the ripples, this is the line traveling wave performance. Similarly on the distribution line, when there is a fault, there will be a specific traveling wave, these traveling waves will be propagated along the line forward, to provide us with important information about the fault.
一、Distribution line operating environment
Just like many distribution lines across the country, the location of distribution lines is mostly mountainous, with old lines and poor access, which are more affected by bad weather and prone to faults such as tree barriers, intrusion and lightning strikes. In the past, after the failure, because the line is long, the power supply radius is large, repair personnel can not quickly and accurately reach the blackout area, once the fault finding time is longer, affecting the residents, business production and life, at the same time will bring direct losses to the power company.
二、Distribution line failure
Distribution line faults are generally divided into single-phase grounding, phase-to-phase short circuits, grounded phase-to-phase short circuits these forms. Part of the small current grounding faults can not be found in time, because it is not enough to cause tripping, but this kind of fault occurs in the rain, fog, atmospheric moisture content of the environment of the probability of a very large; In addition, the conductor floating plastics, clothing and other foreign objects, external damage, bird damage, lightning strikes will also be caused by tripping to the distribution line, short-circuit and other phenomena. Therefore, it is particularly important to quickly find and remove the faults after they occur for the operation of the power grid.
三、Response program
In view of the above distribution line fault problems, Shenzhen TD Tech launched the solution of distribution network traveling wave fault early warning and localization device. The device combines intelligent sensors, mixed energy supply, deep learning algorithms and other advanced technologies are installed in the conductor, to achieve the distribution line high-frequency traveling wave current, industrial frequency current synchronization of the collection of travelling wave data; its non-missing monitoring mechanism, can capture the distribution line fault moment travelling wave, and in advance under the early warning information to ensure that the fault occurs can be quickly localized to the specific level of the pole tower.
When distribution line failure occurs, the system can identify the type of fault and accurately locate the fault point, send the fault information to the cell phone or client, the monitoring center management personnel timely command scheduling operation and maintenance personnel for repair, effectively reduce the scope of patrol line, improve the efficiency of operation and inspection, improve the recovery of power supply time, to ensure the reliability of power supply to the distribution line.
四、Partial characteristics of the device
1、Built-in multiple wireless communication methods for data transmission；
2、Real-time tracking, capturing and monitoring of voltage deviation, frequency deviation and other indicators, and early warning information on grounding, short-circuiting and other kinds of faults are sent down through SMS and WeChat;
3、With power quality monitoring, low voltage, line heavy, overload monitoring governance；
4、Distributed small-current grounding picket monitoring with the ability to distinguish between sexual and transient faults.
5、Background software data real-time storage, with historical data query and other functions, through the trend, wavelet transform analysis to achieve fault point localization