Performance Evaluation of Traveling Wave Fault Locator for a 220kV Hoa Khanh-Thanh My Transmission Line
Abstract
This paper presents the traveling wave based fault location methods of SEL-400L, and SFL-2000 available on the market for a 66.9km, 220kV Hoa Khanh-Thanh My transmission line in Central Viet Nam, such as single-ended, and double-ended, all of which rely on measurements from inductive CTs and capacitive VTs. Focus was given on the building process of a Matlab Simulink model to evaluate these methods. Current and voltage signals were sent to an analog Chebyshev type II filter which passes higher frequency signals at 3kHz and rejects low frequencies signal at 50Hz. After that, these output signals are used in Clarke's transformation for getting 0 and α components. The detail coefficient of the selected components after DWT using Db4 wavelet at decomposition level 1 can be used to determine the fault types, the direction of fault and propose a crest-wave comparison solution to identify exactly the adjacent bus' reflected wave from the fault point's reflected wave for the fault location. Finally, the accuracy of fault location on the transmission line is reviewed by varying various parameters like fault type, fault location and fault resistance on a given power system model.
Keywords:
transmission line, traveling wave fault locator, single ended method, double ended method, Matlab/SimulinkDownloads
References
L. K. Hung, V. P. Huan, “A Studying Of Single Ended Fault Locator On SEL Relay”, IETEC’13 Conference, Ho Chi Minh City, Vietnam, December 4-6, 2013
SEL, SEL T400L Ultra high speed transmission line relay traveling wave fault locator high resolution event recorder Instruction Manual, 2018
Kinkei System Corporation, Surge type fault locator system specifications SFL 2000, 2016.
S. Parmar, Fault Location Algorithms for Electrical Power Transmission Lines Methodology, Design, and Testing, MSc Thesis, Delft University of Technology, 2015
B. Kasztenny, A. Guzmán, N. Fischer, M. V. Mynam, D. Taylor, “Practical setting considerations for protective relays that use incremental quantities and traveling waves”, 43rd Annual Western Protective Relay Conference, Washington, USA, October 18-20, 2016
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