The ac resistance of conductors

TITLE

In a previous article I looked at the dc resistance of conductors and in this article we turn our attention to ac resistance. If you have not read the previous article, now may be a good time to do so. The ac resistance of a conductor is always larger than the dc resistance. The primary reasons for this are 'skin effect......Read More..

By Steven McFadyen on Wednesday, January 11, 2012

Restricted Earth Fault Protection

TITLE

The windings of many medium and small sized transformers are protected by restricted earth fault (REF) systems. The illustration shows the principal of REF protection....Read More..

By Steven McFadyen on Sunday, March 25, 2012

Cable Insulation Properties

TITLE

Cable insulation is used to provide electrical separation between conductors of  a cable.  During the historical development of cables, numerous types of insulation have been employed.  During recent years, there has been some consolidation in the types of insulation used. This post provides some information on the more......Read More..

By Steven McFadyen on Tuesday, May 15, 2012

Community Activity


Journal Entries

Edvin Luis Muñoz answered the question relay testing

1 month ago

SuperUser AccountSteven's Catalogue and Technical links had a large maintenance requirement compared to the number page views recorded. To more effectively spend development time on other areas of the site, we have disabled these pages. If we receive sufficient feedback, we may consider enabling the pages at some future date.

1 month ago

    Latest Note Discussions

    myElectrical Tools

    myElectrical Tools

    We have tools to help.  Our tools range from assisting with basic calculations to IET compliant cable sizing. Feel free to browse and try. 

    Units Conversion
    Complex Number Calculator
    3-Phase Calculations
    IEE Cable Sizing
    Circuit Protective Conductor
    Power Factor Correction

    even more tools...

    Contribute

     

    Notes

    Notes is a collaborative collection of electrical engineering information and educational material. Why not consider adding your knowledge and help make a better Notes for everyone.

    Have something interesting to share or some hidden knowledge why not add a post. Sharing your thoughts and ideas is a great way to pass on knowledge.  Who knows you may even become famous along the way. 

    Learn More

    Contribute - Questions and Answers

    Questions

    Have a question. Care to help by using your expertise to answer. Contribute to our questions and build up your reputation.

    It's quick and easy to ask or answer questions. Why not give it a try.

    Learn More


    Latest Questions:

    1. Power consumption of motor during starting
    2. Inspection of Cathodic Protection Transformer Rectifier
    3. Per Unit & Faults
    4. relay testing
    5. UPS battery sizing
    6. VSD/ VFD/ softstarters current supply to motor
    7. On load RPM of DC series motor
    8. Motor Current Calculation

    most popular notesMost Popular Notes:







    newsletter logo

    Our Newsletter

    Receive updates on new posts by email
    down arrow

    Our website uses cookies so that we can provide a better experience.
    To learn more about what cookies are and how to manage them visit AboutCookies.org