Title: Design of impulse grounding resistance measurement system for distribution network based on wavelet packet optimal algorithm

Authors: Qing Wang; Na Yu; Chencong Jin

Addresses: Department of Electrical Engineering, Hebei Vocational University of Technology and Engineering, Xingtai, 243000, China ' Department of Electrical Engineering, Hebei Vocational University of Technology and Engineering, Xingtai, 243000, China ' Department of Electrical Engineering, Hebei Vocational University of Technology and Engineering, Xingtai, 243000, China

Abstract: Accurate measurement of distribution network grounding resistance is helpful to improve the lightning protection performance of distribution network transmission lines. However, traditional measurement methods can not completely eliminate the invalid interference information in the signal. Therefore, a measurement system for impulse grounding resistance of distribution network based on wavelet packet optimisation algorithm is designed. Compared with traditional systems, this measurement system can more effectively and orderly extracts and process information with wavelet packet optimisation algorithm. The impact current generator is used to generate the impact current. The acquisition board and the main control unit are isolated by V/F transformation module and infrared communication module. In terms of software, the initial resistance signal measurement value is calculated based on the system measurement principle, and the initial resistance signal is processed by the wavelet packet optimal algorithm to remove the interference signal and retain the effective signal reflecting the ground resistivity information. It is verified that the designed system has high measurement precision. It is a highly reliable system for measuring the impulse grounding resistance of distribution networks.

Keywords: wavelet packet; optimal algorithm; distribution network; impulse current; impulse grounding resistance; resistance signal; measurement system.

DOI: 10.1504/IJPT.2023.136140

International Journal of Powertrains, 2023 Vol.12 No.4, pp.357 - 371

Received: 24 Aug 2022
Accepted: 24 Feb 2023
Published online: 18 Jan 2024 *

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