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.

Home / Technical Articles / Directional protection relays applied to multiple power sources, parallel circuits and loops

Directional protection

Directional protection is usually applied to distribution systems that contain multiple power sources, parallel circuits and rings/loops. For such systems it is absolutely necessary to have protection against fault currents that could circulate in both directions, avoiding disconnection of unnecessary circuits.

Directional protection relays applied to multiple power sources, parallel circuits and loops
Directional protection relays applied to multiple power sources, parallel circuits and loops

Contents:

  1. Busbar supplied by two parallel sources
  2. Directional Overcurrent Relays
    1. Definite time-current characteristics
      1. Definite-Current Protection
      2. Definite-Time Protection
    2. Inverse-Time Protection
      1. Very Inverse (VI) Oversurrent protection
      2. Extremely Inverse (EI) Overcurrent Relays
  3. Directional Relays Operation
    1. Example #1
    2. Example #2
  4. Directional Earth-Fault Protection

Premium Membership Required

This technical article/guide requires a Premium Membership. You can choose an annually based Plus, Pro, or Enterprise membership plan. Subscribe and enjoy studying specialized technical articles, online video courses, electrical engineering guides, and papers. With EEP’s premium membership, you get additional essence that enhances your knowledge and experience in low- medium- and high-voltage engineering fields.

Check out each plan’s benefits and choose the membership plan that works best for you or your organization.

Save 15% – Get 15% discount on Pro Plan, apply discount code: UX778

Log In »Learn More »

Premium Membership

Get access to premium HV/MV/LV technical articles, electrical engineering guides, research studies and much more! It helps you to shape up your technical skills in your everyday life as an electrical engineer.
More Information
author-pic

Edvard Csanyi

Electrical engineer, programmer and founder of EEP. Highly specialized for design of LV/MV switchgears and LV high power busbar trunking (<6300A) in power substations, commercial buildings and industry facilities. Professional in AutoCAD programming.

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!

fifteen  −    =  nine

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.