The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A novel selectivity technique to estimate the faulty feeder in MV networks was introduced in [1]. This technique depended on the directionality of discrete wavelet transform (DWT) detail coefficient of a residual current of each feeder with respect to the DWT detail coefficient of the residual voltage. The algorithm efficacy has been examined with high impedance arcing fault due to leaning trees....
Electrical faults due to leaning trees are common in Nordic countries. This fault type has been studied in and it was found that the initial transients in the electrical network due to the associated arc reignitions are behavioral traits. In this paper, these features are extracted using the discrete wavelet transform (DWT) to localize this fault event. Wireless sensors are considered for processing...
The faults due to leaning trees are common in Nordic Distribution networks. In [1], the detection of this fault type has been discussed and the faulty section has been estimated using a novel selectivity technique. This detection was based on an absolute sum of Discrete Wavelet Transform (DWT) detail coefficients of the residual voltages. The detection selectivity function depended on the transient...
Electrical faults due to leaning trees have been studied in [1]-[2] and it was found that the initial transients due to the associated arc reignitions are behavioral traits. These transients have been localized using the discrete wavelet transform (DWT). In this paper, these features are extracted from residual voltages using DWT. Therefore, the fault localization is carried out. The term for locating...
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...
In this paper, features of earth faults due to leaning trees are extracted from the network phase currents using the discrete wavelet transform (DWT). Due to the associated arc reignitions, the initial transients in the electrical network give behavioral traits. The detection security is also enhanced because the DWT is responded to a periodicity of the initial transients. The absolute sum of the...
In this paper, a step-by-step method to model power transformer winding faults is presented. This method is directly applicable to electromagnetic transient programs considering single and three phase N-winding transformers. Simulation of turn-to-earth and turn-to-turn faults covering the entire range of the winding is outlined. A step-by-step derivation of the model is presented starting from the...
In this paper, the performance of discrete wavelet transform (DWT) is investigated. Impact of the type and order of the mother wavelet, sampling frequency, and the signal waveform on the DWT performance is evaluated in the scope of power system protection requirements. A novel DWT computation algorithm is introduced in order to eliminate the complexity encountered in real-time implementation. Efficacy...
A robust non-communication scheme for transmission line protection is presented. The scheme facilitates the simultaneous detection of the remote breaker operation in order to adaptively accelerate zone 2 tripping of the local zone. A modal transform-based decision algorithm is proposed to efficiently detect symmetrical/unsymmetrical faults. Modal quantities as well as current phase angle variations...
In this paper, an evaluation study of the behaviour of the overcurrent and differential relays of the HVDC converter during common internal faults is presented. The study is conducted via simulation of an HVDC converter using the electromagnetic transient program (EMTP). Rectifier misfire and backfire in addition to the inverter fire-through and different types of commutation failure are considered...
This paper describes the details of a Simulink-based dynamic testing of the power differential relay. Power differential relay has been simulated and tested for transmission lines as a MATLAB/SIMULINK model with the use of the Power System Blockset. The developed modeling facilitates testing the dynamic behavior of the power differential relay during fast system transients. Different outputs have...
Induction motors plays very important part in the safe and efficient running of any industrial plant. Early detection of abnormalities in the motor would help to avoid costly breakdown. Accordingly, this paper presents an accurate mathematical model for diagnosis of stator winding faults in induction motors. This model is based on the d,q axis theory, and valid for both the transient and steady-state...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.