Investigation on fault location techniques for uhv line using one end data

Abstract

newline The transmission line is one of the main components in an electric power system. As the transmission lines are exposed to nature, the possibility of transmission lines, experiencing faults is generally higher than that of other main components. When a fault occurs on a transmission line, it is very important to detect it, determine its type, and find its location in order to make necessary repairs and to restore power as soon as possible. The fault location technique can be classified into two categories: (i) methods using data at two terminals of a transmission line; and (ii) methods using data at one terminal. It is well known that techniques based on two terminal data require communication links and more complex synchronized sampling equipments, such as the Global Positioning System (GPS) method. Incorporating such communication techniques increases the investment. newlineConventional single-ended fault location methods are usually based on the lumped parameter models. After adopting reasonable assumptions, various single-ended fault location algorithms, which are based on the lumped parameter models, can largely be immune to the impacts of the parameter uncertainty of the opposite end and fault resistance. However, the impact of the distributed capacitance in the high-voltage transmission line cannot be removed, which results in a greater negative effect on the precision of the fault location. In the lumped parameter line model, shunt capacitances are neglected. It may cause estimation errors for a long transmission line. Especially, when the fault occurs at the end of a long transmission line, the measured distance will be longer than the real distance, which is the common newline newline