Search

Premium Membership

Save 15% on Pro Premium Plan with discount code: UX778 (expires on October 31st). Study specialized LV/MV/HV technical articles and papers.

Abstract

The purpose of this “Cahier Technique” is to explain the specific phenomena observed in LV installations when there is an overload or electrical fault in circuits equipped with variable speed drives. Various recommendations are given to ensure that persons and property are protected, and to provide optimum continuity of service.

Purpose

The purpose of “frequency converter” type variable speed drives is to supply 3-phase asynchronous motors in such a way as to obtain operating characteristics which are radically different from those obtained in normal use (motors supplied directly from the power supply), with constant amplitude and frequency. The table in figure 1 lists the advantages of these devices.

Principle

This consists of supplying the motor with a voltage wave with variable amplitude and frequency, while keeping the voltage/frequency ratio more or less constant. This voltage wave is generated by an electronic power device whose simplified schematic is shown in figure 4.

AUTHOR: Schneider Electric experts | Jacques SCHONEK, Yves NEBON

Title:LV protection devices and variable speed drives (frequency converters)
Format:PDF
Size:0.5MB
Pages:34
Download:Right here | Video Courses | Membership | Download Updates

LV protection devices and variable speed drives

Premium Membership

Get access to premium HV/MV/LV technical articles, advanced electrical engineering guides, papers, and much more! It will help you to shape up your technical skills in your everyday life as an electrical engineer.
More Information

Leave a Comment

Tell us what you're thinking... we care about your opinion! Please keep in mind that comments are moderated and rel="nofollow" is in use. So, please do not use a spammy keyword or a domain as your name, or it will be deleted. Let's have a professional and meaningful conversation instead. Thanks for dropping by!

  −  two  =  one

Learn to Design Power Systems

Learn to design LV/MV/HV power systems through professional video courses. Lifetime access. Apply a 15% discount code EAB77 and enjoy learning!

Subscribe to Newsletter

Subscribe to our Weekly Digest newsletter and receive free updates on new technical articles, video courses and electrical guides.