Research on the Arithmetic of Non-unit Voltage Protection for EHV Transmission Line Based on Wavelet Analysis

2005 ◽  
Author(s):  
Ming-yu Yang ◽  
Shi-xu Wang ◽  
Chen Mao-ying
Keyword(s):  
Wavelet Analysis ◽  
Transmission Line ◽  
Unit Voltage

Detection and Identification of Error in On-Line Monitoring of Transmission Line

2014 ◽  
Vol 687-691 ◽  
pp. 869-873
Author(s):  
Song Hai Fan ◽  
Shu Hong Yang
Keyword(s):  
Wavelet Analysis ◽  
Transmission Line ◽  
Systematic Approach ◽  
Abrupt Change ◽  
Power Grid ◽  
Positive Sequence ◽  
Test Results ◽  
Detection And Identification ◽  
On Line ◽  
Sequence Parameters

Systematic approach for the transmission line positive sequence parameters, temperature, and sag based on wavelet analysis to detect error is developed in this work. Unbiased (random/Gaussian) error such as, transient meter failures, transient meter malfunction, and measurements captured during system transients, are inherently in the form of large abrupt change of short duration in a measurement-sequence. These should be detected before the data is used because their presence will lead to insecure and unstable of power grid. The test results of the proposed method based on data of Sichuan power grid are presented.

Single-Phase-to-Earth Fault Detection for High Voltage Transmission Line Based on Wavelet Analysis

2011 ◽  
Vol 230-232 ◽  
pp. 559-563 ◽  
Author(s):  
Zhuan Yang ◽  
Ai Hua Dong
Keyword(s):  
Fault Detection ◽  
Wavelet Analysis ◽  
Transmission Line ◽  
High Voltage ◽  
Single Phase ◽  
Singularity Analysis ◽  
Singularity Detection ◽  
High Voltage Transmission Line ◽  
Earth Fault ◽  
High Voltage Transmission

The voltage and current signals are transient signals with singularity and mutability when single-phase-to-earth fault occurs in high-voltage transmission line, of which the singular point and mutations parts contain rich fault information. However, wavelet analysis just has the nature of singularity detection and zoom properties, which is very effective in singularity analysis and singular points location. Based on the basic principle of wavelet analysis and signal singularity detection, simulation and detection of singularity of fault voltage and current signals in high voltage transmission line are made by db5 wavelet multi-scale comprehensive analysis method. The singularity detection and calculation program are accomplished in M-file form by programming in MATLAB, the simulation results show that db5 wavelet can detect the singularity of fault signal and determine the fault occurrence and end time fast and accurately. This method enhanced accuracy and reliability of single-phase-to-earth fault detection.

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