Electrical Faults in Power Systems (original) (raw)
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Advanced Technologies, Systems, and Applications III, 2019
Power system fault localization is immensely important factor towards faster fault removal and quick comeback to function with minimal disruptions. Thus, it can be achieved less electric power equipment straining and better customer satisfaction. Power lines are one of the most important components in every power system. Overhead lines are exposed to environmental influence and their possibility of failure is much higher compared to other system components. The period of time needed for locating the fault significantly affects the electrical power quality. This study presents some of the practical experiences of fault locating, based on fault information from Disturbance Recorder and the PowerCAD fault calculation, used in lack of sophisticated tools and module for locating the faults, in some parts of electric power system of Bosnia and Herzegovina, real MV distributive systems of Maglaj Municipality (System 1) and Olovo Municipality (System 2). The results of fault analysis for mentioned areas show that this way faults can be located with high accuracy, in order to take quick and effective actions of their removing and re-establish normal power supply.
An algorithm for faults calculation in power system
This paper presents a simple algorithm for calculation of simultaneous faults.i.e. Series and parallel faults in power system. The objective of this paper is fault calculation which provides current at fault locations as well as the current through each branch and voltage at each bus; this helps to design a good protective scheme which gives compressive and pragmatic fault analysis. The most important technique of this paper is the consideration of unequal magnitude of source e.m.f and with different phase angle to show the effect on fault analysis and protection of the system. The algorithms help to find out the different parameter to analysis the fault in simple and complicated power system.
Classification of Faults in Power Transmission Systems Using Modern Techniques
Bio-Inspired Computing for Information Retrieval Applications
Power system constitute a major part of the electrical system relating in the present world. Every single portion of this system assumes a major part in the accessibility of the electrical power one uses at their homes, enterprises, workplaces, industrial facilities and so on. Any deficiency in power system causes a ton of inconvenience for the maintenance of the system. So transmission system needs a proper protection scheme to ensure continuous power supply to the consumers. The countless extent of power systems and applications requires the improvement in suitable techniques for the fault classification in power transmission systems, to increase the efficiency of the systems and to avoid major damages. For this purpose, the technical literature proposes a large number of methods. This chapter analyzes the technical literature, summarizing the most important methods that can be applied to fault classification and advanced technologies developed by various researchers in power tran...
2015
Faults can be defined as the flow of a massive current through an improper path which could cause enormous equipment damage which will lead to interruption of power, personal injury, or death. In addition, the voltage level will alternate which can affect the equipment insulation in case of an increase or could cause a failure of equipment start-up if the voltage is below a minimum level. As a result, the electrical potential difference of the system neutral will increase. During normal operating conditions, current will flow through all elements of the electrical power system within predesigned values which are appropriate to these elements' ratings. Any power system can be analysed by calculating the system voltages & currents under normal & abnormal scenarios.
This paper presents an assessment study for adaptive single-pole automatic reclosure (ASPAR) schemes to select correctly the best scheme at responsible indices. Suggested solutions for the drawbacks that were noticed with the previous methods are investigated. In addition, this paper presents a proposed technique for ASPAR on transmission lines using wavelet packet transform(WPT). The ASPAR aims to discriminate between the faults’ natures and to detect the instant of arc extinguished. The proposed technique uses an adaptive threshold level, and therefore, no adjustment is needed for various transmission systems. The proposed technique is examined at different fault scenarios that involve different fault locations, inception angles, and representation to secondary arc characteristics with various arc models. In addition, the behavior of ASPAR is well studied under power swing situation. The effects of shunt reactor compensators on the proposed technique are checked. The proposed scheme is tested for different network configurations, single and double circuits, to realize the robustness and the capability of the proposed scheme. The ATP/EMTP package is developed to emulate different fault signals to validate the proposed scheme. The proposed adaptive threshold scheme discriminates correctly between permanent and transient faults, thereby enhancing power system stability for compensated and uncompensated networks.
Classification Of Faults In Power System Using Signal Processing Approach
This paper proposes a new technique for classification of faults on transmission line in power system. The power system network considered in this study is " IEEE 14 BUS SYSTEM " simulated in PSCAD. Voltage and current signals are processed using S-transform technique. The multiresolution S-transform is based on a variable width window, which changes with frequency. Energy levels on the basis of parseval's theorem are calculated to distinguish the different types of faults .The results obtained shows effectiveness of this technique.
2020
In any power systems, protective devices will detect fault conditions and operate circuit breakers in order to disconnect the load from the fault current and limit loss of service due to failure. This fault may involve one or more phases and the ground, or may occur between two or more phases in a three-phase systems. In ground, fault’ or ‘earth fault, current flows into the earth. In a poly-phase system, a fault may affect each of the three phases equally which is a symmetrical fault. If only some phases are affected, the resulting ‘asymmetrical fault’ becomes more complicated to analyze due to the simplifying assumption of equal current magnitude in all the phases being no longer applicable. Therefore, the prospective short circuit current of the fault can be calculated for power systems analysis procedures. This will assist in the choice of protective devices like circuit breakers, current transformers and relays. This research work evaluated and analyzed the occurrence of faults...
A canonical model for the study of faults in power systems
IEEE Transactions on Power Systems, 1991
This paper introduces a general class of fault conditions encompassing all possible faults in a power system as e.g., simultaneous symmetrical and unsymmetrical short-circuits, line interruptions and predicted breaker operations at different locations. The influence of mutually coupled lines, static VAR systems and/or faults at several bus-bar systems are also considered. The fault conditions are described in both the (three)phase and sequence domains, with the same simplicity. The proposed model of a faulted power system is in a canonical form, over the general class of fault