Order Publications

Reference: ISH2015_229

Type:
ISH Collection
Title:

Determination of asymmetry of currents and voltages in high voltage power transmission with a long transmission line

 

Abstracts

This work aims to develop a method to determine the asymmetry of currents and voltages in power transmission as well as to study the impact of the transmitted power, parameters of transmission lines, and adjacent systems on the asymmetry of currents and voltages in a power transmission. The calculation devised herein is based on quadripole equations in a matrix form and a method to achieve symmetrical components. The analysis of asymmetry is conducted on an example 500 kV power transmission that includes a transmission line with horizontal arrangement of phase conductors as well as sending and receiving systems. It is shown that, asymmetry of negative sequence currents for the untransposed transmission line can be up to 10% under small transmitted power and up to 2% for negative sequence voltage under transmitted power, more than the natural power. These values are higher than the permissible values, specified by regulations. Implementation of a full cycle of phase transposition allows for significant reduction in the asymmetry ratio of currents and voltages. It is also revealed that, except transmitted power, significant impact on asymmetry values lengthens the transmission line and impedances of the adjacent systems. The impact of the earthing scheme and number of grounded wires is negligible. Finally, a comparison of the obtained results with results of ATP EMTP software is conducted.
 

File Size: 509,4 KB

Year: 2015

 
 
 
Download
Member
FREE free
Non member
FREE free
 

Your AccountYour Account

Password forgotten

Members

may download free of charge all publications including most recent ones


Non Members

may download free of charge publications over three years old and purchase all publications

ContactContact

For any questions in connection with the on-line library, contact:


Publications and Editions Manager

publications@cigre.org