Ferroresonance occurrence represents a very dangerous phenomenon to electric power systems. Concerning the recent trend of applications grid-connected wind farms, this can lead undesired overvoltages stressing farm components. In paper, ferroresonance are studied and mitigated for farm. Single-pole switching breaker is considered, where it most famous reason behind transient events in During pe...

This work presents a methodology to be used estimate the Metal Oxide Surge Arresters’ (MOSAs’) useful life, based on prediction model Adaptive Neuro-Fuzzy Inference System (ANFIS). For this purpose, database consisting of MOSA’s total leakage current was used. Thus, it possible build time series composed values third harmonic component current. is one indicators MOSAs’ degradation level most in...

Lightning and switching overvoltages are the main causes for faults in electrical networks. In the last decades, several different conventional methodologies have been used for the adjustment of the lightning performance of high voltage transmission lines, which are protected against lightning using overhead ground wires and surge arresters. The current paper proposes a new developed Artificial...

The object of research is the equivalent circuit an impulse current generator designed for testing surge arresters. Calculation parameters when discharging a capacitor bank to complex nonlinear load difficult task analytical solution. Until now, application arrester frequency-dependent models was limited problems overvoltage computation. Surge can predict residual voltage with high accuracy. Th...

The aim of this study is to propose simple and reliable techniques to assess the condition of metal oxide arrester based on the dielectric response techniques. A number of modern electrical diagnostics for Metal Oxide Surge Arrester (MOSA) are discussed in this paper. The techniques included return voltage, decay voltage and polarisation/depolarisation current measurement. The single and multip...

In the operation of broadcasting transmitter, during a lightning storm, comes to frequent surge arrester failures in switchgear transmitter and along 10 kV supply cable (surge arresters section boxes). Analysis strokes is given paper. EMTP simulation loading was conducted. The energy overload due flash with more than one or flashes short time. Recommendations were also for improvement existing ...

− In this paper are described the design and application of an inductive magnetic sensor based on nanocrystalline alloys. The sensor is adjusted for measurement and monitoration of currents with intensities from some microamperes to miliamperes. Its functional behaviour, performance and a specific application are described. One of the biggest advantages of this current sensor is its non-invasiv...