Minimum Amplitude of Geomagnetic Disturbance in Electrical Power System Leading to 500kV transformer DC Bias

2013 ◽  
Vol 676 ◽  
pp. 251-254
Author(s):  
Wei Li Wu
Keyword(s):  
Power System ◽  
Electrical Power ◽  
Time Derivative ◽  
Geomagnetic Disturbance ◽  
Electrical Power System ◽  
Three Phase ◽  
Article Analysis ◽  
Induced Currents ◽  
Minimum Amplitude ◽  
The Relationship

This article analysis the relationship between geomagentically induced currents(GIC) in electrical power system flowing through 500kV transformer neutral point in Ling’Ao power grid and the geomagnetic data observed at Guangzhou geomagnetic observatory during 2004/11 -2006/12. It is found that correlation coefficient between GIC and magnetic field component variation may be greater than that of time derivative of the geomagnetic field, which are all less than -0.5. According to the relation, The minimum amplitude of geomagnetic component variation is 7.08(nT/min) in term of transformer of single or three phase five columns while is about27.47(nT/min) when the type is three phase three columns.

Protection Study in the EPS, Electrical Power System

2021 ◽  
pp. 377-394
Author(s):  
Gustavo Vinicius Duarte Barbosa ◽  
José Ronaldo Tavares Santos
Keyword(s):  
Power Systems ◽  
Power System ◽  
Regulatory Agency ◽  
Short Circuit ◽  
Salt Spray ◽  
Electrical Power ◽  
Electrical Power System ◽  
Electrical Power Systems ◽  
Two Phase ◽  
Three Phase

Electrical power systems are susceptible to faults caused, for example, by storm, pollution, vandalism, lightning, salt spray, etc. The unscheduled interruption in the supply of electricity to consumers, whether industrial, residential, or commercial, entails severe fines for the transmission utility and/or electricity distributor, imposed by the regulatory agency. Thus, the EPS must have a well-dimensioned protection system, capable of identifying the fault, which is characterized by a single-phase, two-phase, three-phase short circuit, among others, and interrupt the missing section in the minimum time so that the effects of this lack are as small as possible for the SEP, especially with regard to its integrity and operational security.

Analysis of Balanced Three-Phase Induction Motor Performance under Unbalanced Supply using Simulation and Experimental Results

1970 ◽  
Vol 109 (3) ◽  
pp. 41-45 ◽  
Author(s):  
I. Temiz ◽  
C. Akuner ◽  
H. Calik
Keyword(s):  
Power Systems ◽  
Power System ◽  
Induction Motor ◽  
Induction Motors ◽  
Electrical Power ◽  
Electrical Power System ◽  
Current Harmonics ◽  
Operation Analysis ◽  
Simulink Model ◽  
Three Phase

Induction motors are known to affect the electrical power system in terms of harmonics. Induction motors fed by unbalanced power systems produce additional current harmonics. These harmonics cause additional power losses in the machine. The method of symmetrical components is often used in this kind of unbalanced operation analysis. In this study, the performance of a three phase induction motor supplied by unbalanced power system due to the various causes has been examined using both experimental method and Matlab/Simulink model. Ill. 11, bibl. 6, tabl. 6 (in English; abstracts in English and Lithuanian).http://dx.doi.org/10.5755/j01.eee.109.3.167

scholarly journals A Three Phase Matlab Simulink Model of IEEE 57 Bus Power System Network

2018 ◽  
Vol 7 (4.24) ◽  
pp. 142
Author(s):  
VeeraBhadra Chary. Gade ◽  
Mercy Rosalin. Kotapuri
Keyword(s):  
Power System ◽  
Reactive Power ◽  
Electrical Power ◽  
Transient State ◽  
Simulation Software ◽  
Dynamic State ◽  
Electrical Power System ◽  
Matlab Simulink ◽  
Three Phase ◽  
Line Diagram

The Electrical power system, field engineers always strive to design a Real time power system model to anticipate the practical outcomes. The simulation software not only fixes the changes in power system, but also trying to perceive the potential impact of power system before construction. A realistic model of the power system is very essential for the future and present operations. Present, this paper makes center of attention on designing of 3-phase power system network of IEEE 57 bus power system network within the Matlab Simulink module. It supports GUI (Graphical User Interface) based models of power system components, which are used to design a dynamic model of the power system. The present design is based on the test case data and the one line diagram; so that the three-phase model is equivalent to single phase one line diagram. The simulation of this model allows for verification of voltage, current, active power and reactive power of each bus and variation of those parameters with respect to time domain waveform. The present model is also useful for learning the operation of the power system network under Steady state, Transient state and Dynamic state with the application of FACTS, Fuzzy, and ANN etc.

Gradient Ascent Optimization for Fault Detection in Electrical Power System Based on Wavelet Transformation

2019 ◽  
Vol 14 ◽  
Author(s):  
Iyappan Murugesan ◽  
Karpagam Sathish
Keyword(s):  
Feature Extraction ◽  
Fault Detection ◽  
Power System ◽  
Electrical Power ◽  
Daubechies Wavelet ◽  
Electrical Power System ◽  
Gradient Ascent ◽  
Neural Learning ◽  
Weight Value ◽  
Transmission And Distribution

: This paper presents electrical power system comprises many complex and interrelating elements that are susceptible to the disturbance or electrical fault. The faults in electrical power system transmission line (TL) are detected and classified. But, the existing techniques like artificial neural network (ANN) failed to improve the Fault Detection (FD) performance during transmission and distribution. In order to reduce the power loss rate (PLR), Daubechies Wavelet Transform based Gradient Ascent Deep Neural Learning (DWT-GADNL) Technique is introduced for FDin electrical power sub-station. DWT-GADNL Technique comprises three step, normalization, feature extraction and FD through optimization. Initially sample power TL signal is taken. After that in first step, min-max normalization process is carried out to estimate the various rated values of transmission lines. Then in second step, Daubechies Wavelet Transform (DWT) is employed for decomposition of normalized TLsignal to different components for feature extraction with higher accuracy. Finally in third step, Gradient Ascent Deep Neural Learning is an optimization process for detecting the local maximum (i.e., fault) from the extracted values with help of error function and weight value. When maximum error with low weight value is identified, the fault is detected with lesser time consumption. DWT-GADNL Technique is measured with PLR, feature extraction accuracy (FEA), and fault detection time (FDT). The simulation result shows that DWT-GADNL Technique is able to improve the performance of FEA and reduces FDT and PLR during the transmission and distribution when compared to state-of-the-art works.

scholarly journals Optical Voltage Transformer Based on FBG-PZT for Power Quality Measurement

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2699
Author(s):  
Marceli N. Gonçalves ◽  
Marcelo M. Werneck
Keyword(s):  
Power System ◽  
Power Quality ◽  
Distribution System ◽  
Electrical Power ◽  
Quality Measurement ◽  
Pockels Effect ◽  
Electrical Power System ◽  
Voltage Transformer ◽  
Technical Literature ◽  
Distribution Lines

Optical Current Transformers (OCTs) and Optical Voltage Transformers (OVTs) are an alternative to the conventional transformers for protection and metering purposes with a much smaller footprint and weight. Their advantages were widely discussed in scientific and technical literature and commercial applications based on the well-known Faraday and Pockels effect. However, the literature is still scarce in studies evaluating the use of optical transformers for power quality purposes, an important issue of power system designed to analyze the various phenomena that cause power quality disturbances. In this paper, we constructed a temperature-independent prototype of an optical voltage transformer based on fiber Bragg grating (FBG) and piezoelectric ceramics (PZT), adequate to be used in field surveys at 13.8 kV distribution lines. The OVT was tested under several disturbances defined in IEEE standards that can occur in the electrical power system, especially short-duration voltage variations such as SAG, SWELL, and INTERRUPTION. The results demonstrated that the proposed OVT presents a dynamic response capable of satisfactorily measuring such disturbances and that it can be used as a power quality monitor for a 13.8 kV distribution system. Test on the proposed system concluded that it was capable to reproduce up to the 41st harmonic without significative distortion and impulsive surges up to 2.5 kHz. As an advantage, when compared with conventional systems to monitor power quality, the prototype can be remote-monitored, and therefore, be installed at strategic locations on distribution lines to be monitored kilometers away, without the need to be electrically powered.

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