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Current Sensing System for Protection of High Power Frequency Converters

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6 Author(s)
Simkevicius, C. ; Center for Phys. Sci. & Technol., Semicond. Phys. Inst., Vilnius, Lithuania ; Zurauskiene, N. ; Balevicius, S. ; Stankevic, V.
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The design and test results of a current-sensing system used for the protection of frequency converters, which are used for controlling the speeds of ac induction motors, are presented. The proposed pulse current-sensing system consists of a magnetic field sensor, which is made of thin polycrystalline La-Sr-Mn-O manganite film exhibiting the colossal magnetoresistance (CMR) effect, and a microcontroller with a 12-bit A/D converter that is used for recording the fault current signal. The magnetic field generated by the high power current cable is fed using a flux concentrator to the manganite magnetic field sensor (CMR-resistor). The design of the contactless current sensor, consisting of two manganite resistors, is developed and investigated. The system is tested in the ambient temperature range of 0-45°C. The possibilities of using this method in other pulsed power systems are discussed.

Published in:

Plasma Science, IEEE Transactions on  (Volume:41 ,  Issue: 10 )

Date of Publication:

Oct. 2013

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