Table of Contents
Advances in Power Electronics
Volume 2012, Article ID 270680, 8 pages
Research Article

Power-Integrated Circuit Active Leakage Current Detector

LABCATyP, Department of Electronics, Faculty of Engineering, University of Buenos Aires, Av. Paseo Colón 850, C1063ACV, Buenos Aires, Argentina

Received 30 December 2011; Revised 28 March 2012; Accepted 29 March 2012

Academic Editor: Francesco Profumo

Copyright © 2012 M. F. Bulacio 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.


Most of the failures of induction motors become insulation faults, causing a permanent damage. Using differential current transformers, a system capable of insulation fault detection was developed, based on the differential relay protection scheme. Both signal injection and fault detection circuitry were integrated in a single chip. The proposed scheme is faster than other existing protection and not restricted to protect induction motors, but several other devices (such as IGBTs) and systems. This paper explains the principle of operation of fault protection scheme and analyzes an integrated implementation through simulations and experimental results. A power-integrated circuit (PIC) implementation is presented.