Three Phase Fault Currents Evaluation for 11 Bus 132 kV Transmission System, kotkapura (original) (raw)
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Three-Phase Fault Currents Evaluation for Nigerian 28-Bus 330kv Transmission System
Fault studies are important power system analysis for stable and economical operations of power systems. Faults are categorised as symmetrical and unsymmetrical. In this paper, three-phase symmetrical fault is simulated using the Nigerian 28-Bus, 330kV Transmission Grid. Two different MatLab based programmes were developed; one program was for Load Flow Studies which determines prefault conditions for the power system based on Newton-Raphson method. The other program determines fault current magnitudes for threephase short-circuit on the power system. The information gained from the fault studies can be used for proper relay selections, settings, performances and coordination.
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...
Report THREE PHASE TRANSMISSION LINE FAULT ANALYSIS
TCRLS, 2020
Power transmission is a major issue in electrical engineering after power generation . Fault in transmission line is common and main problem to deal with in this stream . The faults occurring in power systems can be broadly classified into symmetrical faults and unsymmetrical faults, there is yet another classification of fault types namely, shunt type of faults and series type of fault ,in this paper we are analyzing only shunt type of faults, this shunt type of fault involve short circuit between the conductors and or between conductor and ground . They are characterized by increases in current and fall in voltage and frequency in faulted phase . The different kinds of shunt faults are single line to ground fault ,double line to ground fault and three line to ground fault .The study of these faults are necessary to ensure that reliability and stability of the power system. approaches MATLAB software in which user friendly tool box will assist using that transmission line model design and various fault time will be given with the help of signal builder .After that various effects on bus system due to different are shown such as voltage ,current and fault current output in terms of waveforms .By analyzing waveforms we can calculate which fault occurring is maximum and what are the safety measurement that we can include in the power system to overcome this fault.
Journal of Newviews in Engineering and Technology, 2020
This paper presents the improvement of 132/33KV transmission injection substations protection, mainly short circuit fault on Port Harcourt Mains Zone seeks to correct the irregular tripping sequence, discrimination of relays, improper isolation action by the circuit breaker, poor current transformer ratio (CTR) calibration of the system. The 3x60MVA injection substation of the network was modeled. Short circuit analysis technique embedded in Electrical Transient Analyzer tool version 16.0 software was used to determine the tripping sequence of relay to circuit breaker coordination, using data from Transmission Company of Nigeria and Port Harcourt Electricity Distribution Company of Nigeria (PHED). tripping sequence operation report showed that faults created at respective classified zones: A, B, C and D were analyzed and observed in accordance to the individual relay responsiveness to faults conditions. When a three (3) phase fault created at Zone-B, an irregular relay was observed in the order of 1, 3, 2, and 4 with a tripping time of 11.5ms. This indicates violation in the relay response to fault conditions. Evidently, a new case of the study was re modelled in order to satisfy the statutory conditions. The current transformer (CT-ratio) of the existing condition of (1200/1 = 1200:1) was modified through short calculation to (900/5 = 900:5) in order to enhance orderly coordinated sequential tripping of 1, 2, 3 and 4 wit tripping time of 7.1ms. The new case showed improved protection (i.e. the irregular relay tripping sequence in the order of 1, 3, 2 and 4 and tripping time of 11.ms of Zone B with a 3 phase fault was improved to have a regular relay tripping sequence in the order of 1, 2, 3 and 4 and tripping time reduced from 11.5ms to 7.1ms) using short circuit analysis technique through relay coordination of the 132/33KV Port Harcourt Mains Z2 injection Substation in Rivers State.
Analysis of Symmetrical Fault in IEEE 14 Bus System for Enhancing Over Current Protection Scheme
International Journal of Future Generation Communication and Networking, 2016
The paper provides a simulation model of IEEE 14 bus system for short circuit studies and analysis of symmetrical fault using MiPower software. At the event of a fault occurrence, short circuit studies are performed to obtain current flow magnitude at different time intervals for a power system until steady state condition is achieved. The paper gives simulation result for the current which flows in different parts of the power system immediately after occurrence of a fault. The data obtained is further used to decide switch gear ratings and circuit breakers and also aids in setting and coordination of protective relays. Further the simulation result provides data regarding the contribution of different power system apparatus to the fault located at different buses in the power system and it gives an efficient, accurate and easy way to analyze symmetrical faults in a given power system.
Three-Phase Fault Analysis on Transmission line In MATLAB SIMULINK
Abdullahi Afwah, 2019
Now-a-days the demand of electricity or power are increases day by day this results to transmits more power by Increasing the transmission line capacity from one place to the other place. But during the transmission some faults are occurred in the system, such as L-L fault (line to line), 1L-G fault (single line to ground) and 2L-G fault (double line to ground). These faults affect the power system equipments which are connected to it. The main aim of this paper is to study or analysis of faults and also identifies the effect of the fault in transmission line along with bus system which is connected to transmission line. Mainly the major faults in long transmission lines is (L-G) single line to ground fault which are harmful to the electrical equipment. A proposed model in transmission line is simulated in MATLAB software to analysis and identified the faults. Fault block was taken from the sim-power system block library. The whole modeling and simulation of different operating and different conditions of fault on transmission line, their faults are L-G fault, 2L-G fault, 3L-G fault and three line short circuit of the proposed work is presented in this paper. Keywords-L-L-Line to Line fault, 1L-G-Single Line to Ground fault, 2L-G Double Line to Ground fault.
A Fast Approach for Short Circuit Analysis on 330kV Nigeria Power System
2019
Fault in electrical power system is unavoidable. The occurrence of faults in power system network destabilizes the system. Thus, it requires a fast technique to stabilize the system to avoid total system collapse. In this work, an application program was developed using MATLAB tool based on bus impedance matrix method. Bus impedance matrix is used because it has several advantages over Thevenin equivalent method and other conventional approaches since it can be used to analyze large network and solve for branch currents. This approach contains off-diagonal elements of the system which Thevenin and other conventional approaches do not have. The work investigated line-to-line fault on a 4bus/330kV Nigeria power system, under unbolted fault condition. The total fault current was found to be 10p.u while the voltages for buses 1, 2, 3 and 4 were obtained as 1p.u at phase a which shows that phase a was not affected during the fault. Phase b and phase c show equal voltages for the respective buses during the fault. Bus-3 shows a lesser voltage of 0. 97p.u due to fault occurring at bus 3. The approach can identify the rating of the protective device for effective protection of the system over short circuit occurrence at a short period of about 1sec.
2014 International Conference on Automatic Control Theory and Application, 2014
This paper presents the impact study of using series Flexible AC Transmission System (FACTS) devices, Thyristor Controlled Series Capacitor (TCSC), GTO Controlled Series Capacitor (GCSC) and Thyristor Controlled Series Reactor (TCSR), on the short circuit parameters of a 400 kV single electrical transmission line in case of three phase fault. The case study is an electrical transmission line in the Algerian transmission network which is compensated by each of the three mentioned devices at its midpoint. Simulations results investigate the impact of the conduction angle of FACTS power electronic devices on the short circuit parameters of the line in case of three phase fault. The obtained results verify the presented theoretical analysis of short circuit calculations.