New method for voltage sags characteristics detection in electrical networks

2010 ◽  
Author(s):  
Florin Molnar-Matei ◽  
Mihai Moga ◽  
Adrian Pana
Keyword(s):  
New Method ◽  
Voltage Sags ◽  
Electrical Networks

scholarly journals Method for determining the maximum load of consumers in city power supply systems

2019 ◽  
Vol 139 ◽  
pp. 01078 ◽  
Author(s):  
A.G. Saidkhodjaev ◽  
A.M. Najimova ◽  
A.K. Bijanov
Keyword(s):  
Power Supply ◽  
Maximum Load ◽  
High Accuracy ◽  
New Method ◽  
Electrical Networks ◽  
Electric Networks ◽  
Reliable Determination ◽  
Supply Systems

In this article, we propose a new method for determining the maximum load of electric consumers in urban electric networks, which differs from existing methods in more accurate and reliable determination of the maximum loads. Based on the determination of the maximum loads of the objects of urban electrical networks, it is concluded that the proposed methods are determined by high accuracy and minor errors.

THE ERROR MINIMIZATION OF DIGITAL FOURIER FILTER USED IN UNIPROCESSOR PROTECTIVE RELAYING FOR 6–33 kV ELECTRICAL NETWORKS

2005 ◽  
Vol 14 (05) ◽  
pp. 953-963
Author(s):  
ABDULLAH I. AL-ODIENAT ◽  
OMAR Y. RADAIDEH
Keyword(s):  
New Method ◽  
Error Minimization ◽  
Electrical Networks ◽  
Protective Relaying ◽  
Oscillatory Frequency ◽  
Software Structure ◽  
Functional Features ◽  
Automatic Switching ◽  
Switching Devices

In this paper, a new method for error minimization of digital Fourier filter is proposed. The proposed method is tested by operating the electrical networks at oscillatory frequency. The functional features of microprocessor protective relaying and automatic switching devices are considered. The software structure of uniprocessor protective relaying and automatic switching equipments for the 6–33 kV lines are also presented.

A New Fault-Positions Method Based on Interpolation for the Area of Vulnerability to Voltage Sags

2013 ◽  
Vol 325-326 ◽  
pp. 681-686
Author(s):  
Shuang Ya Zhou ◽  
Shun Tao ◽  
Xiang Ning Xiao ◽  
Chao Luo ◽  
Xiao Chen Zhen
Keyword(s):  
Power System ◽  
Short Circuit ◽  
New Method ◽  
Voltage Sag ◽  
Voltage Sags ◽  
Regional Power ◽  
Short Circuit Calculation ◽  
Point Of Common Coupling ◽  
Transformer Winding ◽  
Common Coupling

The area of vulnerability (AOV) of point of common coupling (PCC) can directly reflect the issue of voltage sag caused by faults in power system. In order to calculate the area of vulnerability more accurately and faster, this paper proposes a new fault positions method based on interpolation, which overcomes the blindness of setting fault points. The influence of transformer winding connections on voltage sag is also taken into account. Short-circuit calculation is adopted and transfer matrix representing the transfer law of transformer on voltage sag is deduced firstly. Then, the principle and implementation flow of the new method are presented in detail. Finally, the new method is applied to a regional power system of China, and graphic result of the area of vulnerability is displayed under balanced and unbalanced faults.

A new method for classification and characterization of voltage sags

2001 ◽  
Vol 58 (1) ◽  
pp. 27-35 ◽  
Author(s):  
Mladen Kezunovic ◽  
Yuan Liao
Keyword(s):  
New Method ◽  
Voltage Sags

A New Method to Detect Voltage Sag Based on Wavelet Energy Entropy

2013 ◽  
Vol 448-453 ◽  
pp. 2254-2258 ◽  
Author(s):  
Chang Gang Wang ◽  
Lin Chuan Wang ◽  
Jia Liu ◽  
Bin Liu
Keyword(s):  
Power System ◽  
New Method ◽  
Voltage Sag ◽  
Voltage Sags ◽  
Peak Voltage ◽  
Wavelet Energy ◽  
Energy Entropy ◽  
Drop Time ◽  
Power System Faults ◽  
Wavelet Energy Entropy

Voltage sags was a common power system disturbance, usually associated with power system faults. Nowadays, there were more and more methods to detect voltage sag, involving with RMS, peak voltage detect, FFT. Owing to their defections, they were too slow when they came to being applied to detect voltages sags. This paper presents a method based on wavelet energy entropy detection voltage sags, this method can detect the drop time quickly and sensitively. In order to verify the feasibility of the proposed method, a numerical example simulation has been done based on matlab / simulink , results show that there is a significant effect.

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

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