PLC Based Overcurrent Protection of Three-phase Transmission Line (original) (raw)
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Design and Implementation of Overcurrent Relay to Protect the Transmission Line
Power system is prone to faults, because of disoperation of the system or by the natural disasters. This may be caused with damage the components of power system leading to great tasked for their subrogation and cutting the power supply to customers. In this period, much power is exhausted and this stipulation is increasingly transmitted by using transmission line, from one side or place to another side. Different kinds fault may occur in these transmission lines. The major purpose of this article is to analysis and studies the different faults and also declares the impact on transmission line. This work is approach to MATLAB/SIMULINK package. In this work we connect a 100Km terco type and the various cases of fault types are studied where over current relays (OCRs) are used in this work.
Signals
When a fault occurs on the transmission line, the relay should send the faulty signal to the circuit breaker to trip or isolate the line. Timely detection is integral to fault protection and the management of transmission lines in power systems. This paper focuses on using the threshold current and voltage to reduce the time of delay and trip time of the instantaneous overcurrent relay protection for a 330 kV transmission line. The wavelet transforms toolbox from MATLAB and a Simulink model were used to design the model to detect the threshold value and the coordination time for the backup relay to trip if the primary relay did not operate or clear the fault on time. The difference between the proposed model and the model without the threshold value was analysed. The simulated result shows that the trip time of the two relays demonstrates a fast and precise trip time of 60% to 99.87% compared to other techniques used without the threshold values. The proposed model can eliminate the...
Definite time over-current protection on transmission line using MATLAB/Simulink
Bulletin of Electrical Engineering and Informatics
This paper has investigated the application of the definite time over-current (DTOC) which reacts to protect the breaker from damage during the occurrence of over-current in the transmission lines. After a distance relay, this kind of over-current relay is utilized as backup protection. The overcurrent relay will provide a signal after a predetermined amount of time delay, and the breaker will trip if the distance relay does not detect a line failure. As a result, this over-current relay functions with a time delay that is just slightly longer than the combined working times of the distance relay and the breaker. This DTOC is tested for various types of faults which are 3phase fault occurring at load 1, 3-phase fault occurring at load 2, a 3-phase fault occurring before primary protection, and the behaviour of voltage and current with a failed primary protection. All the results will be obtained using the MATLAB/Simulink software package.
OVERHEAD LINE PROTECTION WITH AUTOMATIC SWITCH BY USING PLC AUTOMATION
Transmission lines are the important factor of the power system. Transmission and distribution lines has good contribution in the generating unit and consumers to obtain the continuity of electric supply. Now a day in the transmission lines are ON/OFF are the major and important part in the power system. And also maintenance of the transmission line is also important part in transmission line. In the earlier system for the fault like overloading of the transmission line AB switches are used. The main disadvantage of old AB switch, is they can only operate manually.
An intelligent overcurrent relay to protect transmission lines based on artificial neural network
International Journal of Power Electronics and Drive Systems (IJPEDS), 2023
Power systems are susceptible to faults due to system failures or natural calamities. This could be caused by damage to power system components, resulting in an interruption of power delivery to clients. Overcurrent relays are important relays that protect distribution feeders, transmission lines, transformers, and other components. The intelligent relay can perform both primary and secondary functions. Line-to-ground (L-G) faults are the most common occurrence in long transmission lines, posing a serious threat to electrical equipment. This article presents improved fault classification for transmission line overcurrent protection and highlights the use of artificial neural network (ANN) techniques to protect transmission lines of 100 km (terco type). An ANN is used to classify the faults. A back propagation neural network (BPNN) is used in this case. The neural network has been trained to classify faults in transmission lines for overcurrent protection. Various fault conditions are considered. In the event of a fault condition, the output of a neural network will be a tripping signal. The MATLAB neural network tool and the Simulink package are used to model the suggested method.
Modelling and Simulation of SCADA and PLC System for Power System Protection Laboratory
Electrical, Control and Communication Engineering, 2021
The protection of power system is an essential trait in a huge network to efficiently detect and isolate the sections undergoing faults or abnormal behaviour. The key components of a protection scheme include circuit breakers, relays, switchgears and fuses which employ communication from one station to another to achieve high-speed tripping. The automation of these components at the laboratory level using programmable logic controller (PLC) along with supervisory control and data acquisition (SCADA) system owns paramount importance for intelligent decision making, sensing, actuating, monitoring and maintaining the record in the host server. This paper discusses such a technique for conventional power system protection laboratory at a new level of development to promote a control system through PLC and SCADA. The control system has indication of over and under values of voltage, load and frequency, which can trigger malfunctioning of equipment and must be rectified. Furthermore, grou...
Modeling and Simulation of a Coordinated Power System Protection using Overcurrent Relay
Nigerian Research Journal of Engineering and Environmental Sciences (RJEES) , 2022
The efficient and reliable operation of a protection system cannot be overemphasized as any shortfall in such system has both huge financial implications and makes the station dangerous and unsafe. The data for the overcurrent relay coordination analysis used in this study was obtained from the Ohiya Umuahia 132/33 kV substation of the Transmission Company of Nigeria (TCN) while the electric transient analyzer program (ETAP) software was used for the analysis. Firstly, a three-phase (3-phase) short circuit test was conducted on the network at the 33 kV busbar. Then, a detailed sequence of operation of the station’s overcurrent relays was done for standard inverse relay setting, very inverse relay setting and extremely inverse relay setting characteristics. Results showed that at t = 0 seconds a 3-phase fault of initial symmetrical current root mean square (RMS) of 3.049 kA, peak value of 7.746 kA and a steady state value of 2.615 kA was induced on the 33 kV busbar, which lasted till t = 0.2 seconds upon action of the circuit breaker. Also, results showed that the individual time current curve (TCC) for the three relays indicated a fault current of 7.746 kA which lasted for 3.57, 3.57 and 3.28 seconds on the network respectively. Effective device coordination of the 132/33 kV transmission station is an appropriate sequence of operation of its protective devices.
A logic based protection scheme for six phase transmission system against shunt and series faults
2016
Multiphase transmission system is a serious contender to the conventional Three Phase System. The fault analysis of Six Phase system is studied and adequate protection scheme is developed. A Logical protection scheme of Six Phase Transmission System against shunt and series faults using Logic Based Detection of negative sequence currents is presented in this paper. World First Six Phase Transmission Line is operating between McCalmont bus and Springdale bus of Allegheny Power System (APS),USA. A few amount of work had been reported on protection of Six Phase Transmission System in literature. This paper bridges the gap and paves the way to boost the research in Protection of Six Phase Transmission System. The Proposed Protection Scheme is a Novel approach as it doesn’t require any special algorithms and using logical approach. Because of this the fault will be cleared with in one cycle and also the previous history of the healthy wave form just few cycle before occurrence of the fau...
A Review on Protection of Transmission Lines
The growth of a country is scaled by the amount of energy it consumes. In the developing India, with the rise of population, increasing number of cities and demanding villages, caused to set up transmission lines with higher capacity. Inter-ties were connected through the transmission lines to lighten every city and village, thus making the whole system complex. This complex system required a robust protection, so that a fault in one place does not cause the unfaulted region to trip or series of trip undesirably, which may otherwise cause a situation of blackout. To protect the power system, we use protective relays-electromechanical, solid state or microprocessor relays. In this paper, different types of protections are discussed. The traditional protection schemes requiring a communication between two ends are discussed which include directional comparison blocking (DCB), permissive overreaching transfer trip (POTT), International Electrotechnical Commission (IEC)-61850 to protect a transmission line using Generic Object Oriented Substation Events (GOOSE) messaging. At the process and station control levels, IEC 61850 define the rules for integration of protection, control, measurement and monitoring functions within a power system network. Successful tests were done by various manufacturers and utilities for substation automation using IEC 61850 proving enhanced interoperability between vendors and systems and elimination of substation wiring. Thus endeavors are now being directed to cover substation to control center and substation to substation automation using IEC-61850.