Abstract
In this paper, a new method for locating single-phase earth faults on non-effectively earthed medium voltage distribution networks is proposed. The method requires only current measurements and is based on the analysis of the negative sequence components of the currents measured at secondary substations along medium voltage (MV) distribution feeders. The theory behind the proposed method is discussed in depth. The proposed method is examined by simulations, which are carried out for different types of networks. The results validate the effectiveness of the method in locating single-phase earth faults. In addition, some aspects of practical implementation are discussed. A brief comparative analysis is conducted between the behaviors of negative and zero sequence currents along a faulty feeder. The results reveal a considerably higher stability level of the negative sequence current over that of the zero sequence current.
Highlights
Feeder automation is one of the distinguishing features of smart grids
The voltage level in the medium voltage side is 20 kV which is fed from a 110-kV supply network using a 40 MVA transformer
The feeder under study has five secondary substations equipped with current measurements
Summary
Feeder automation is one of the distinguishing features of smart grids. It aims at developing self-healing systems, able to locate faults and perform isolation and supply restoration automatically.Reliable fault location and indication is the key to this functionality. Feeder automation is one of the distinguishing features of smart grids. It aims at developing self-healing systems, able to locate faults and perform isolation and supply restoration automatically. Reliable fault location and indication is the key to this functionality. There are established methods for locating them, whereas, for locating earth faults, there is not a universally accepted, reliable and cost-effective method in the market for isolated neutral or compensated networks. A number of methods have been put forward to address this matter. A comprehensive review of the state-of-the-art methods for locating single-phase earth faults in medium voltage (MV)
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