Mechanism Analysis and Experimental Study on Tree Faults in Transmission Lines

Abstract

It is difficult to reclose transmission line successfully after tree fault occurs, which is easy to cause line outage. At present, most of the existing research focuses on the diagnosis and disposal of tree faults, while the mechanism of tree faults is relatively rare. Firstly, the formation process of tree faults and the typical discharge characteristics at different tree height stages are analyzed. Then, the process of tree-wire gap discharge at different stages is simulated in laboratory environment. With trees approaching transmission lines, corona discharge, hidden discharge and flashover discharge occur in turn, and the discharge increases from weak to strong, and the amplitude increases, while the frequency of discharge waveform tends to decrease.

Research on Tree Flash Fault Localization of Hybrid Overhead–Underground Lines Based on Improved Double-Ended Traveling Wave Method

“…Considering the extreme imbalance between the spacing of trees and conductors within specific spacing areas, their distances have a linear correlation with the breakdown current intensity. Taking 4 kV/cm as a reference for the breakdown current intensity and calculating it with a voltage of 100 kV, the maximum clearance distance between trees and conductors will reach 25 cm [31]. If this safety distance is exceeded, it may lead to tree flash fault discharge problems.…”

“…Ali Jahani et al [9] compared the effectiveness of different models in predicting the collapse of Platanus orientalis trees in urban forests and proposed a prediction model based on a Support Vector Machine (SVM), providing urban forest managers with an effective tool for ecological failure risk assessment. Zhenyao Liu et al [10] analyzed the mechanism of tree fault occurrence and simulated the discharge process between trees and transmission lines in a laboratory environment, revealing the changing characteristics of discharges when trees approach transmission lines. Mohammad Sadegh Bashkari et al [11] analyzed distribution network outage data to identify the primary factors leading to vegetation-related outages and extracted relevant features.…”