NDLI: Distance relaying algorithm using a DFT-based modified phasor estimation method

Content Provider	IEEE Xplore Digital Library
Author	Dong-Gyu Lee Ye-Jim Oh Sang-Hee Kang Han, B.M.
Copyright Year	2009
Description	Author affiliation: Next-generation Power Technology Center (NPTC) and the Department of Electrical Engineering, Myongji University, Korea (Dong-Gyu Lee; Ye-Jim Oh; Sang-Hee Kang; Han, B.M.)
Abstract	In this paper, we propose a distance relaying algorithm using a discrete Fourier transform (DFT)-based modified phasor estimation method to eliminate the adverse influence of exponentially decaying DC offsets. Most distance relays are based on estimating phasors of the voltage and current signals. A DFT is generally used to calculate the phasor of the fundamental frequency component in digital protective relays. However, the output of the DFT contains an error due to exponentially decaying DC offsets. For this reason, distance relays have a tendency to over-reach or under-reach in the presence of DC offset components in a fault current. Therefore, the decaying DC components should be taken into consideration when calculating the phasor of the fundamental frequency component of a relaying signal. The error due to DC offsets in a DFT is calculated and eliminated using the outputs of an even-sample-set DFT and an odd-sample-set DFT, so that the phasor of the fundamental component can be accurately estimated. The performance of the proposed algorithm is evaluated for a-phase to ground faults on a 345 kV, 50 km, simple overhead transmission line. The Electromagnetic Transient Program (EMTP) is used to generate fault signals. The evaluation results indicate that adopting the proposed algorithm in distance relays can effectively suppress the adverse influence of DC offsets.
Starting Page	1
Ending Page	6
File Size	202282
Page Count	6
File Format	PDF
ISBN	9781424422340
DOI	10.1109/PTC.2009.5282053
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-28
Publisher Place	Romania
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Protective relaying Discrete Fourier transforms Frequency EMTP Voltage Protection Digital relays Fault currents Power transmission lines Signal generators Discrete Fourier Transform Distance Relay DC Offset Phasor Estimation
Content Type	Text
Resource Type	Article

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