Study on electric motor protection scheme of high voltage variable frequency system

Abstract

Abstract:

Abstract:For the characteristics of high voltage variablefrequency electric motor transformation, a differential protection is formed using double criterions of phasor differential and sampled values differential based on frequency tracking. This paper introduces the configuration scheme of variablefrequency electric motor protection, and expounds the frequency tracking method that combining zerocrossing detection algorithm and Fourier algorithm. After that, a simulation experiment of developed protection device is conducted, and the result shows that this device could provide rapid and reliable protection for variablefrequency electric motor under different frequencies.

Key words:

Keywords:high voltage variablefrequency electric motor, protection, frequency tracking, sampled values differential, zero crossing detection

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Study on electric motor protection scheme of high voltage variable frequency system

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