Premium Membership ♕

Save 50% on all EEP Academy courses with Enterprise Membership Plan and study specialized LV/MV/HV technical articles & guides.

Home / Technical Articles / Single phase and three phase capacitive-load switching in transmission & distribution systems

Interruption of capacitive currents

The interruption of capacitive currents is a usual switching case, unlike the making and breaking of fault currents. The usual cases, in which a capacitive current is switched, are switching of unloaded overhead transmission lines, local substation components, cables, capacitor banks and others.

Single phase and three phase capacitive-load switching in transmission & distribution systems
Single phase and three phase capacitive-load switching in transmission & distribution systems

First, let’s explain the basic nature of these cases in which a capacitive current is switched and then in details 1-phase and 3-phase cases.


  1. Capacitive-load switching cases
    1. Switching of unloaded overhead transmission lines
    2. Switching of local substation components
    3. Switching of cables
    4. Switching of capacitor banks
  2. Single-phase capacitive-load switching
  3. Three-phase capacitive-load switching

1. Capacitive-load switching cases

1.1 Switching of unloaded overhead transmission lines

In this case, the load is already switched off by a breaker at the remote end of the line, but due to the stray capacitance of the overhead-line, a small capacitive current is still flowing in the system, to be interrupted by the substation breaker.

The current to be interrupted depends on the voltage level and the length of the line, and possibly on some station components.

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.

Good To Know!Save 50% on all video courses by purchasing Enterprise plan.

Log In »Purchase »

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

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!

  ⁄  nine  =  one

Learn How to Design Power Systems

Learn to design LV/MV/HV power systems through professional video courses. Lifetime access. Enjoy learning!

Subscribe to Weekly Newsletter

Subscribe to our Weekly Digest newsletter and receive free updates on new technical articles, video courses and guides (PDF).
EEP Academy Courses - A hand crafted cutting-edge electrical engineering knowledge