Modelling Corona Discharge Characteristic in Electricity Transmission Lines for Fault Detection System

Abstract

The corona discharge in high voltage transmission lines is the source of additional technical losses for the electric power system and the reason of energy imbalance. Increased corona discharge losses may be one of the indicators of temporary short circuit faults in the power line or damage of power line insulation. Also, this type of discharge is the source of higher current harmonics, which can adversely affect the reliability of communication and other technical systems in the vicinity of the power line. The characteristic of the corona discharge in the line is influenced by the surface crack or break-down of the insulators in the garland, damages in the wires structure, approaching tree branches and various atmospheric phenomena. The identification of the causes of corona discharge is an important task in reducing the technical costs of energy transmission and increasing the reliability of power lines and other technical systems in their vicinity. The paper presents the results of the research aimed at examining the possibility of determining the causes of corona discharge by analysing the current and voltage registrations from fault identification and location system.