Published On: Mon, Jan 4th, 2021



Author: Radoje Jankovic

Fig. 1. Here, we see flat (rectangular cross-section) low-voltage painted busbars in one cell of the distribution switchgear.

Busbars are groups of “conductors” in low and high voltage electrical plants from which individual consumers are supplied, whether they are within the plant itself or in a building. They are used for power voltage distribution. In low voltage plants, as a rule, 3 or 4 busbars are used, while in high voltage plants only 3 busbars are always used for three phases.

By construction, the busbars can be solid profile, laminated and stranded (rope).

The full profile, usually rectangular and circular in cross-section, is used for low-voltage and high-voltage indoor and outdoor installations.

Round busbars can also be tubular.

Terminal busbars are most commonly used in outdoor installations for almost all voltage levels from medium to highest voltage levels. These busbars are copper or Al / Che.

Laminated busbars are of more recent date and are used in low-voltage and medium-voltage cells of distribution plants, and can be insulated or uninsulated. I’ve talked about them before.

It should also be said that busbars of full profile but “complex” cross-section are used a lot, e.g. “U”, “L”, etc. Full profile busbars are mounted on supporting insulators made of porcelain or some artificial insulating mixture.

Fig. 2. My fhoto, you can see the pipe busbars at the 20 kV outdoor distribution switchyard.

Low-voltage and high-voltage busbars can be painted with appropriate color-defined standards as shown in this figure. These colors are in accordance with DIN, VDE and IEC as well as our domestic standards. Of course, in some countries the colors of the buses are different (England, America…). I mention this for the reason that you are not awake when you see busbars painted outside the mentioned standards in some photos.

Fig. 3. My photo, you see the strand Al/Steel busbars in a 35 kV outdoor switchyard.

Colored buses can be loaded with higher current. Refer to the bus tables in one of the electrical manuals.

All busbars in all plants must be designed for all loads and forces that occur in the plant.

In the first photo from my colleague Berislav Pribanić, we see flat low-voltage painted busbars in one cell of the distribution plant.

In the second photo of me, you can see the pipe busbars at the 20 kV outdoor distribution plant.

In the third, my photo, you see the strand Al/Steel busbars in a 35 kV outdoor switchyard.

Original work.

Note: Read ours new serie of articles on new branch of Ecology  „ECOLOGY OF MAN“.

About the Author

- Radoje - Rade Jankovic Electrician, Electrical Technician, Electrical Engineer, PhD, Ecologist, Environmentalist, Designer, Educator, Investigator... Today PROFESSIONAL TECHNICAL WRITER AND DOCUMENTATOR Massive practical experience in almost all fields of electrical engineering over 40 years. My International education group in Facebook: EEEW - ELECTRICAL & ELECTRONIC EDUCATION WORLD where published more than 8000 small or bigger articles, lessons, technical advice, projects, technical calculations, test questions with and without answers, illustrated test questions with and without answers; all my original works and few thousands of may original photos from practice, drawings, circuit diagrams, environmental lessons and examples from everyday practice etc., etc.

Displaying 5 Comments
Have Your Say
  1. ygaryhwoki says:

    Muchas gracias. ?Como puedo iniciar sesion?

  2. I was very pleased to find this web site. I need to to thank you for ones time due to this wonderful read!! I definitely really liked every bit of it and I have you saved to fav to look at new information in your blog.

  3. Good day! Do you use Twitter? I’d like to follow you if that would be ok. I’m undoubtedly enjoying your blog and look forward to new updates.

  4. Excellent read, I just passed this onto a friend who was doing a little research on that. And he just bought me lunch as I found it for him smile Therefore let me rephrase that: Thanks for lunch!

  5. Keep functioning ,fantastic job!

Leave a comment

XHTML: You can use these html tags: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>