December 2020

For long VFD/ASD secondary cable lead lengths, it has become common practice to use a dV/dT filter to avoid reflective wave phenomena and to attempt to control common mode noise issues with the motor being driven. No matter the circumstances of the application, manufacturers often claim that their dV/dT filter:

When the Cities of South San Francisco/San Bruno Water Quality Control Plant (WQCP) explored options to reduce energy consumption, they performed an energy audit to determine where it was best to focus their efforts for maximum benefits. This audit concluded that the aeration blowers consumed the largest amount of electrical power in the whole plant. Since California has one of the most aggressive environmental policies in the world  and offers incentives

A difficult application for proper equipment coordination and harmonic mitigation is the operation of a three phase drive load structure with a single phase source. Many pump manufacturers have standardized on 3 phase drive and motor/pump configurations for their own convenience. But in reality, real world applications are rarely ‘standardized’. In many circumstances, smaller lift stations, irrigation ESP installations, and other pump installations only have a single phase 240V or 480V source...