DocumentCode :
2062967
Title :
A new fault location method based on the correlation of zero mode current
Author :
Shicong Ma ; Jianbo Guo ; Baiqing Li ; Huadong Sun ; Wei Wei ; Zhiqiang Bo
Author_Institution :
CEPRI, Beijing, China
fYear :
2012
fDate :
10-14 Sept. 2012
Firstpage :
1
Lastpage :
5
Abstract :
A new earth fault location method for non-effective earthed neutral network using transient signals measured at the bus terminal is presented. Based on the mode network of the single phase to ground fault, the s-domain equation of the faulty feeder is derived and the discrete difference equation is obtained by z-transform. Then fault distance is evaluated form transient data using the least square estimation. The adoption of Γ-mode equivalent circuit reduces the number of the parameters to be estimated and simplifies the distance estimation algorithm. The algorithm is effective on intermittence faults as it makes use of transient signals and, consequently, a shorter than half cycle data window. EMTP software was used for simulating the typical distribution system and MATLAB was used for data process. The simulation and calculation results proved the accuracy and reliability of the correlation coefficient method and entropy method. The fault location scheme proposed in this paper is valuable in practical application.
Keywords :
EMTP; difference equations; equivalent circuits; fault location; neural nets; power cables; power distribution faults; signal processing; transforms; EMTP software; MATLAB; bus terminal; correlation coefficient method; data processing; discrete difference equation; distance estimation algorithm; earth fault location method; faulty feeder; half cycle data window; intermittence faults; least square estimation; noneffective earthed neutral network; r-mode equivalent circuit; s-domain equation; single phase mode network; transient signal measurement; z-transform; zero mode current correlation; bilinear transformation; fault location; non-effective earthed neutral system; parameter estimation; transient signal;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electricity Distribution (CICED), 2012 China International Conference on
Conference_Location :
Shanghai
ISSN :
2161-7481
Print_ISBN :
978-1-4673-6065-4
Electronic_ISBN :
2161-7481
Type :
conf
DOI :
10.1109/CICED.2012.6508679
Filename :
6508679
Link To Document :
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