Title :
An adaptive fault locator system for transmission lines
Author :
Jiang, Joe-Air ; Ying-Hong Liu ; Chih-Wen Liu ; Yang, Jun-Zhe ; Too, Tong-Ming
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
This paper presents an adaptive fault locator system which utilizes two-terminal Global Positioning System (GPS) based synchronized phasor measurements for on-line estimation of line parameters in steady-state and calculation of fault location in the occurrence of faults. Uncertainty about the line parameters, which usually results in a significant error in the calculated fault location, can be resolved in the proposed parameter estimation algorithm. A novel fault location index in terms of Clarke components of the synchronized voltage and current phasors is also proposed to calculate the fault location in the accuracy of up to 99.9%. This paper also proposes a new discrete Fourier transform (termed as smart discrete Fourier transform, SDFT) based algorithm to eliminate system noise and measurement errors. The field tests of two GPS based phasor measurement prototypes demonstrate that a synchronization error between two remotely spaced prototypes is small enough for a fault locator. The performance of the parameter estimation algorithm and index is illustrated with simulation results from EMTP
Keywords :
Global Positioning System; discrete Fourier transforms; electric current measurement; fault location; parameter estimation; power transmission faults; power transmission lines; synchronisation; voltage measurement; Clarke components; EMTP; adaptive fault locator system; discrete Fourier transform; fault location index; line parameters estimation; measurement errors; on-line estimation; parameter estimation algorithm; smart discrete Fourier transform; steady-state; synchronization error; synchronized phasor measurements; synchronized voltage/current phasors; system noise elimination; transmission lines; two-terminal Global Positioning System; Adaptive systems; Discrete Fourier transforms; Fault location; Global Positioning System; Parameter estimation; Position measurement; Prototypes; Steady-state; Transmission line measurements; Transmission lines;
Conference_Titel :
Power Engineering Society Summer Meeting, 1999. IEEE
Conference_Location :
Edmonton, Alta.
Print_ISBN :
0-7803-5569-5
DOI :
10.1109/PESS.1999.787441