Abstract
Due to the complex structure of the T-connection transmission lines, it is extremely difficult to identify the reflected travelling wave from the fault point and that from the connection point by the measurement from only one terminal. According to the characteristics of the structure of the T-connection transmission line, the reflection of the travelling wave within the line after the failure of different sections in T-connection transmission line are analyzed. Based on the lattice diagram of the travelling wave, the sequence of travelling waves detected at the measuring terminal varies with the fault distance and the faulty section. Moreover, the sequence of travelling waves detected in one terminal is unique at each faulty section. This article calculates the arrival time of travelling waves of fault points at different locations in different sections to form the collection of the travelling wave arrival time sequence. Then the sequence of travelling waves of the new added fault waveforms is extracted to compare with the sequences in the collection for the faulty section identification and fault location. This proposed method can accurately locate the fault with different fault types, fault resistances and system impedances by only single-terminal fault data. Both Power Systems Computer Aided Design/ Electromagnetic Transients including DC (PSCAD/EMTDC) and actual measurement data are implemented to verify the effectiveness of this method.
Highlights
With the global emphasis on environmental protection and the recent acceleration of urbanization, an increasing number of clean energy sources, e.g., wind turbines and photovoltaics, have been merged into the Chinese power grid through 110 kV transmission lines [1,2,3,4]
A number of fault location methods for the T-connection transmission line are available in the literature
To determine the location of the fault point, reference [23] utilizes voltage and current signals at the three measuring terminals of the T-connection transmission line to apply a fault location method based on the distributed parameter model of the line
Summary
With the global emphasis on environmental protection and the recent acceleration of urbanization, an increasing number of clean energy sources, e.g., wind turbines and photovoltaics, have been merged into the Chinese power grid through 110 kV transmission lines [1,2,3,4]. After the fault branch is identified in reference [24,25], the travelling wave method of the double-terminal transmission line is applied to locate the fault. This paper discusses the characteristics of the travelling wave propagation in the T-connection transmission line to explain the relationship between the sequence of travelling waves at the measurement terminal and the location of the fault point. The remainder of this paper is organized as follows: Section 2 is devoted to analysis of the travelling wave propagation characteristics of the T-connection transmission line, and of the travelling wave arrival moment sequence under different fault locations.
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