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.
Highlights
Numerical relays are the most popular devices used for transmission line protection
They include fault location estimation based on impedance methods, which uses the voltage and current data measured in 50Hz at one or more points along the power networks after the occurrence of a fault
SIMULATION RESULTS After building, the proposed model is ready to analyze the operation of traveling wave fault locator (TWFL) applied with variation in fault parameters such as fault type, fault location, fault resistance from 1Ω to 35Ω
Summary
Numerical relays are the most popular devices used for transmission line protection. They include fault location estimation based on impedance methods, which uses the voltage and current data measured in 50Hz at one or more points along the power networks after the occurrence of a fault. In 2017, EVN’s project installed a traveling wave fault locator (TWFL) equipment Kinkei SFL-2000, SEL-400L for 220kV, 500kV transmission lines in substations such as Son Ha, Thanh My, Hoa Khanh, Hue, Dong Ha, Tam Ky, and Doc Soi in central Viet Nam. The project implementation plan followed 3 steps. The problem faced by the power system operator is manually collected traveling waves event reports from each substation They lack skills to discriminate the reflection wave of fault point, the time of arrival of the wave for manual fault location estimation using the single-ended method because the reflected surge from the adjacent bus has the same polarity as the real fault point's reflected wave, so the confusion is inevitable.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
