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Mathematical Problems in Engineering
Volume 2014 (2014), Article ID 879402, 13 pages
Research Article

Handling Fault Diagnosis Problem of Linear-Analogue Circuits with Voltage Phasor Measurement

School of Automation Engineering, University of Electronical Science and Technology of China, Chengdu 611731, China

Received 11 April 2014; Accepted 4 August 2014; Published 28 August 2014

Academic Editor: Yuqiang Wu

Copyright © 2014 Xin Gao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper proposes a novel method to estimate the influence of hard-fault in linear-analogue circuit system based on the measurement of voltage phasor with assistant branch introduced. Furthermore, a new fault diagnosis strategy based on the voltage phasor modeling is established, and the tolerance influence on the corresponding voltage measurement is also discussed. The actual analogue circuit test shows us that the proposed method is effective and reliable to locate the accurate fault signature in voltage measurement for the fault diagnosis. As a matter of fact, it includes both the amplitude and phase information in a complex value form when the linear-analogue circuit is under the AC test. Besides, it can be also applied to ambiguous groups and the sensitive test-frequencies determination in the process of fault diagnosis,while the effectiveness of multifrequencies test has also been testified through test-frequencies sweeping investigation and the maximum error evaluation of fault component value in the second circuit example.