A precise measurement method for positive sequence parameters of EHV and UHV transmission lines and its application

2011 ◽  
Author(s):  
Jun Tang ◽  
Jiangang Xu ◽  
Jie Qian ◽  
Zhiyong Chen ◽  
Jian Yin ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Measurement Method ◽  
Precise Measurement ◽  
Positive Sequence ◽  
Sequence Parameters ◽  
Uhv Transmission Lines

An Electroscope System Based on Electric Field Measurement Method for UHV Transmission Lines

2009 ◽  
Vol 10 (2) ◽  
Author(s):  
Fan Yang ◽  
Wei He ◽  
Tao Chen ◽  
Xiaochu Luo ◽  
Yongchang Fu
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Transmission Lines ◽  
Field Measurement ◽  
Measurement Method ◽  
Electric Field Measurement ◽  
Set Up ◽  
Global Regularization ◽  
Uhv Transmission Lines ◽  
Internet Network

The paper describes an electric field measurement method based electroscope system to check the electrification state of ultra-high voltage transmission lines, which is composed of three parts: 1) Measuring terminal; 2) Central sever; 3) GPRS and Internet network. The measuring terminal was used to measure the electric field and the location of the measuring points, then the measured data was sent to the central sever by GPRS and Internet network, and requested for an electricity state confirmation.When the sever received a request from a terminal, the electric fields and locations of the measuring points were obtained first, then according to the location of the measuring points, the server searches the corresponding objective transmission lines in the database and read their parameters. According to the parameters of the measuring points and transmission lines, a calculation would be carried out to confirm the electrification state of the transmission lines. For the confirmation calculation, equations for the electric field inverse problem of the transmission lines were set up first, then global regularization and damped Gauss Newton (DGN) method were used to solve the inverse problem.A 500kV double loops transmission line was taken as an example to verify the validity of this method. The electric field and location of 11 measuring points were measured by the measuring terminal firstly, and then sent to the central sever. Electrification state was confirmed by the central sever.

New Method of Measuring the Positive Sequence Parameters of Transmission Lines under Strong Interference Condition

2012 ◽  
Vol 614-615 ◽  
pp. 837-841
Author(s):  
Zhi Jian Hu ◽  
Xue Feng Liu ◽  
Juan Yang ◽  
Chuan Qi Li
Keyword(s):  
Transmission Lines ◽  
Measurement Procedure ◽  
New Method ◽  
Measuring System ◽  
Positive Sequence ◽  
Interference Condition ◽  
Strong Interference ◽  
Simulation Results ◽  
Sequence Parameters ◽  
The Mathematical Model

An approach to measure the positive sequence parameters of transmission lines based on harmonic method is introduced. The mathematical model and measurement procedure of the new method are explained in detail. The hardware structure of the measuring system based on GPS is given. The simulation results show that the new method can satisfactorily meet the need of measuring the positive sequence parameters of transmission lines under strong interference condition.

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