Short-Circuit Fault Location Method And Software Design Based On Field Measurements Of High-voltage Transmission Lines

With the continuous development of the modern power system as well asinterconnection of regional grid expanding grid structure is more complex, so the safeand stable operation of power facilities, monitoring and protection have higherrequirements. Overhead transmission lines as an important part of the grid, because ofbeing exposed in fluxible natural environment long-term, are vulnerable to the invasionof external damage, chemical corrosion of the gas, and high winds, snow and ice,lightning and other inclement weather, resulting in transmission line breakage, shortcircuit, etc. serious accidents. On the other hand, due to China’s vast land area, thecomplexity of geographical features, energy distribution reverse the status quo,prompting transmission lines toward large-capacity, long-range, multi-loop direction,especially in the western region, the number of high-voltage transmission lines built inthe mountains above failure when the artificial line patrol to find the point of fault, theenormous difficulty, which led to the repair work is slow, causing heavy economiclosses. Therefore study an accurate, reliable overhead transmission line faultlocalization method to shorten the fault repair time, analyze the cause of the accident,and to propose preventive measures has a very important significance. In addition, thesensor technology, communications technology and automation technology used inoverhead transmission line status monitoring for grid state service for the developmentof the technology will play an important role in promoting.The traditional methods of fault location mainly are traveling wave method andimpedance method. The traveling wave method need to be installed directly in thehigh-pressure line end detection device, making the complex structure based on thepositioning system of the traveling wave method, higher costs. Impedance method formeasuring data quality requirements and vulnerable fault impedance, ground impedanceline parameters may cause large errors in fault location. The above two methods can notbe used to meet the requirements of the transmission line fault location. Therefore, thispaper proposes a non-contact power transmission line fault location method based onmagnetic field measurement is introduced based on the method of overhead transmission line fault location system architecture, as well as geographic informationsystem (GIS)-based fault location software design and implementation.This paper studies the basic principles and characteristics of the of severaloverhead transmission line fault location method, comparative analysis of the traditionaloverhead transmission line fault location methods and non-contact magnetic fieldmeasuring their respective advantages and disadvantages of the fault location method.Followed500kV single circuit transmission lines, for example, the overheadtransmission line fault location, fault location and type of fault detection methodanalysis summed, and by means of simulation analysis to verify its feasibility. Further,the paper-based geographic information system component of MapX, developed atransmission line fault location system software based on magnetic field measurements,detailing the implementation of the overall design of the software system and the mainfunction modules. Finally, this article by means of simulation analysis based onmagnetic field measurements, transmission line fault locator software testing, anddemonstration of the software overhead transmission line fault location.