An algorithm for faults calculation in power system (original) (raw)
Related papers
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.
UNSYMMETRICAL FAULT ANALYSIS & PROTECTION OF THE EXISTING POWER SYSTEM
Now a day’s electrical power system is in the process to convert in smart power system with interconnected national and regional grids. Modeling of power system has become a necessary in order to make right decision, check for any potential problems, and fault conditions in large interconnected network. In this paper we shell deal with unsymmetrical faults in a proposed network. In recent year power system engineers shifted protection method from classical methods to digital or numerical protection techniques, in this technique high crunching capability, which has made it possible to design digital filters in real time protection system with smart technologies. Multifunctional relay also installed in modern power system network for protection of transmission line, generator protection, motor protection, real time fault location, protection of busbar and other important equipments. This paper is devoted to abnormal system behaviour under conditions of unsymmetrical fault in power system networks using MATLAB Simulation Techniques
Fault analysis in power system using power systems computer aided design
International Journal of Advances in Applied Sciences (IJAAS), 2020
This work presents a fault analysis simulation model of an IEEE 30 bus system in a distribution network. This work annalysed the effect of fault current and fault voltage in a distribution system. A circuit breaker was introduced into the system to neutralize the effect of the fault. The system was run on a PSCAD software and results were obtained. The system was monitored based on the start time and the end time of the fault and how well the circuit breaker reacts with those times. Fault occurred from 0.100 to 0.300 seconds before it was removed. At the time fault was not applied (i.e. from 0.00 to 0.100 and from 0.300 to 0.72), the circuit breaker was close and became open when fault was applied so as to cut off current flow through the line.The result obtained gave the disruption caused by the fault and the quick response of the circuit breaker in neutralizing it. Results gotten are based on when the circuit breaker is close and no fault is applied and when the circuit breaker is open due to fault. From this work, it was obtained that circuit breakers are very essential in system protection and reliability.
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...
Electrical Faults in Power Systems
Handbook of Research on Emerging Technologies for Electrical Power Planning, Analysis, and Optimization, 2000
The identification and classification of electrical faults have a great importance in power system analysis. They help in the dimensioning and the adequate choice of electrical equipment, especially, for protective and interrupting devices. This chapter describes the various faults undergone by the power system and removes some ambiguities causing confusions and difficulties for the correct classification of faults. Once the faults terminologies are well understood and properly assessed; they can be used efficiently to develop enhanced algorithms dedicated to fault detection, classification, isolation and diagnostics.
IJERT-Open Circuit Fault Analysis of Electrical Power System Using MATLAB
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/open-circuit-fault-analysis-of-electrical-power-system-using-matlab https://www.ijert.org/research/open-circuit-fault-analysis-of-electrical-power-system-using-matlab-IJERTV3IS031578.pdf The present paper is devoted to study the behavior of power system under abnormal conditions of open circuit of transmission lines. Open circuit faults have been simulated on standard IEEE 11 bus system and 30 bus systems. State of the system before and after the fault has been estimated in terms of bus voltages and line losses by solving load flow. Newton-Raphson method is implemented using MATLAB to solve load flow problem. Open circuit conditions have been simulated on the lines one by one and their effect on the bus voltages has been observed and most critical lines are sorted out. To bring the voltages back within normal range, load shedding technique has been suggested. The criterion is to find the bus from which the load is to be shut down for the repairing time of the faulty line so as to bring the voltage magnitude within limits at other buses so that whole power system is avoided from ill-effects of fault. It is observed that line losses tend to increase due to fault but after load shedding these come within same range as before the fault. The analysis of a power system under open circuit faulty conditions is therefore important to determine the values of system voltages, so that protective measures are taken to minimize the harmful effects of such contingencies.
Modelling and Simulation of Symmetrical and Unsymmetrical Faults on 14 Bus Ieee-Power Systems
2021
Short circuit disturbance in the electric power system, is the relationship between one voltage system and another directly connected system with a very small impedance. The direct connection results in the distribution of electric current at the fault point exceeding the nominal current. This situation has an impact on system instability, the system works in an unbalanced state and can damage equipment, if the disturbance is not neutralized (secured). The study of short circuit faults fundamentally consists of symmetrical faults and unsymmetrical faults (line to Ground Fault). In the simulation study, it is observed that three-phase symmetrical faults can be analyzed based on parametric data of the sub-switch reactance of the system, and one-phase asymmetrical faults to ground. Symmetrical fault analysis can be used as a reference in determining the breaker capacity, while for asymmetrical faults, L-G faults are implemented in determining the protection relay settings. The determin...
BASIC MATLAB SIMULATION OF FAULTS WITHIN POWER SYSTEM
This paper reflect analytical and software study of power system faults. Majority of systems existing today are being computerized, Power system is not the exception to this fact. Hence by Software analysis we can reduce the time as well as the manpower required to determine the location as well as magnitude of faults occurring in electrical power system. This paper basically focus on the applicability of MATLAB simulation tool using which the fault analysis of real time power system structure can carried out. The main type of faults which occurs in power system such as Line to Line(LL),Double Line To Ground(LLG) ,Line To Ground(LG) are briefly discussed along with appropriate MATLAB simulation as well as the mathematical analysis. This paper can work as a fundamental block of much larger applications which involves the solutions developing a stable and efficient power system.
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