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Small distribution transformers are often protected with spark gaps. As the spark-gap ignites, an overvoltage is coupled to the secondary side due to the steep voltage change. This overvoltage can reach to the customer socket. In this paper, the breakdown of MV spark-gaps is first modeled under an impulse voltage superimposed on AC voltage. To study the overvoltage propagation to the low voltage side,...
In this paper, the distribution transformer model under lightning impulses introduced by Piantini at no load conditions is investigated. This model is modified where this modification takes more than one resonance frequency into consideration during the model parameters calculation. Therefore, the frequency response of the simulated transient voltage is improved comparing with Piantini model. The...
In this paper, a Bayesian selectivity technique is introduced to identify the faulty feeder in compensated medium voltage (MV) networks. The proposed technique is based on a conditional probabilistic method applied on features extracted from the residual currents only using the discrete wavelet transform (DWT). DWT enhances to localize initial transients generated in the network due to the fault event...
In this paper, ATP-EMTP simulation environment is used to compare the performance of on-line three-phase partial discharge (PD) monitoring system for overhead covered-conductor (CC) distribution lines. The PD measuring system has been developed using two different types of CC line models, i.e. Clarke's and JMarti models. Rogowski coil is used as the sensor to detect and localize PDs caused by falling...
In this paper, the initial transients in the electrical network due to arc reignitions associated with high impedance faults caused by leaning trees are extracted from phase voltages and currents. The discrete wavelet transform (DWT) is used for the fault feature extraction corresponding to band frequency 12.5- 6.25 kHz and therefore localizing this fault occurrence. The detection security is enhanced...
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