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Insulation Gas converter transformer filter unit wika

Consulting - Specifying Engineer | Back to basics: VFDs ...· The line converter operates at a base frequency of 60 Hz while the motor converter operates at a variable frequency (typically 6 to 66 Hz) depending upon the desired speed of the driven motor. The line converter also is provided with PWM switching of the IGBTs, but the switching logic is such that that the converter draws nearly sinusoidal current.

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