Indexed by:期刊论文

Date of Publication:2012-07-15

Journal:Journal of Computational Information Systems

Included Journals:EI、Scopus

Volume:8

Issue:14

Page Number:5885-5892

ISSN No.:15539105

Abstract:Electronic current transformers (ECTs) and electronic voltage transformers (EVTs) play important roles in Substation Automation Systems (SAS). In this paper, we focus on the time synchronization relating to the electronic transformer. In order to reach the highly accurate time synchronization, a two-stage synchronization scheme is proposed to overcome the signal delay. In the first stage, the digital phase- shifter and phase-equalizer are used to compensate the phase displacement of signal samples in a large range and ensure the maximum phase linearity and constant group delay. In the second stage, the signal phase angle is fine-tuned in a small range by employing a second-order interpolation algorithm. The test shows that the method proposed in this paper is feasible. ? 2011 by Binary Information Press.