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SUMMARY Modelling of a high-impedance arcing fault due to a leaning tree in medium voltage (MV) networks was experimentally verified and the network transients due to this fault were also investigated. Even though the tree had a very high resistance value, the initial transients were periodically caused by the arc reignitions after each zero-crossing. In(More)
Transmission lines are designed to transfer electric power from source locations to distribution networks. However, their lengths are exposed to various faults. Protective relay and fault recorder systems, based on fundamental power frequency signals, are installed to isolate and the faulty line and provide the fault position. However, the error is high(More)
The significance of harmonics in power systems has increased substantially due to the use of solid state controlled loads and other high frequency producing devices. An important consideration when evaluating the impact of harmonics is their effect on power system components and loads. Transformers are major components in power systems. The increased losses(More)
Today there is a growing interest in utilizing different distributed energy resources (DER) in the power system. A problem that the system operators, owners and power utilities have to consider is thus how this technology can be integrated within the existing information systems. Another emerging problem is what type of telecommunication architecture should(More)
– An on-line single-phase partial discharge (PD) measuring system using Rogowski coil is simulated in EMTP/ATP for the monitoring of falling trees on covered-conductor (CC) overhead distribution lines. The simulation results are compared with those obtained from the laboratory measurements. The effect of Rogowski coil terminating impedance is analysed for(More)