How Electrical Bushings Work (Power Engineering)

Want to continue learning about engineering with videos like this one? Then visit:
 
Want to teach/instruct with the 3D models shown in this video? Then visit:
 
******************************************************************

Learn how electrical bushings work! Learn all of a bushing’s components, design features, and how it works! Electrical bushing’s are present throughout the power generation, transmission, distribution, and electrical engineering industries, so why not learn about them!

Like this video? Then check out our other videos!

📚Want to learn more about engineering?
Then join saVRee to access over 45 hours of engineering video courses! New courses every month!

Hope to see you on a course soon! 👋

🏫Want to use the 3D model in this video to present, instruct, or teach? Simply join saVRee! We have over 400 engineering models that will make your life a lot easier!

📱Check out our socials!

▶️Introduction

Electrical bushings allow live conductors to be passed through grounded partitions, walls, or tanks etc. without raising their electrical potential (voltage). They perform this task by insulating the central conductor.

The example used in this video shows a 3D animation of an oil insulated porcelain solid/bulk bushing; this bushing is often used with electrical transformers (hermetic and conservator type). Another common bushing design type is the condenser/capacitance graded bushing.

Bushings are commonly seen at substations, power stations and generally in the power engineering industry (generation, distribution and transmission of electricity). Bushings may be of various designs, but are roughly split into two main designs, the bulk/solid type, and the condenser (capacitor grade) type.

How Electrical Bushings Work

Electrical current flowing through a conductor will create a magnetic field and an electric field. The magnetic field is of little interest concerning bushings, but the electric field is. The electric field strength increases as the voltage potential increases. A higher voltage potential will always try to flow to a lower voltage potential e.g. ground. Bushings prevent this by insulating the conductor from the grounded component through which it passes.

Bushing Components
A bushing consists of a conductor, terminals and some form of insulator. The insulator chosen in this video is manufactured from porcelain.

Mineral oil is added to a void space surrounding the conductor and it also acts as an insulator.

To aid with keeping the bushing clean and to maintain resistance on the creepage path (leakage path), rain sheds are used.

The porcelain body is hot glazed as this puts the porcelain under compression stress, which makes it stronger mechanically. Porcelain is weak when tensile stress is applied. The glaze also helps keep the bushing clean.

**********
#saVRee_Nuggets, #saVRee

[savree-d]

Want to continue learning about engineering with videos like this one? Then visit:

Want to teach/instruct with the 3D models shown in this video? Then visit:

[carlton]

This is an unique channel. No one explains the way you have explained it sir.

[butikimbo]

Gold Medal for your professional work. The ausence of background noise such as the very popular use of music, is a great help to understand what is the video about, specially when is a more formal subject mainly to the interest of professionals in the area, despite the fact i am just a curious for tech. Thank you so much for sharing the video.

[jackvermont]

Today I went over Abb’s webinar about Transformer bushing 101. It was 1 hour long and lead by industry engineers, however, I felt that it wasn’t informative enough even for introductory level. I’m glad that I found this video and now looking forward to buy whole course and transformers course as well. This one is, for sure, valuable source of information for electrical engineers and technicians who are working in the utility industry.

[thelastcommander]

Very very very Good. Thank you very much sir.

[Mieko]

The visuals help so much, thank you!... Now I need to find one on the windings.

[debashistarai]

The best.. ❤️
Thanks for all your hard work...

[infernoo__]

Hey brother, you are actually doing a great job, thanks for all videos
Love from 🇮🇳 india

[SecTechie]

Top notch explanation of everything. Very interesting and informative.

[deepaksaiduvvapu]

Thank you for sharing knowledge to us and do keep posting free videos !
Could you please point light on three zone protection of power transmission lines

[Ahmed.Elkholy]

I highly appreciate your work, thank you very much from Egypt

[sweetnsourowaziyo]

Great Video, thank you very much John, you are the best trainer or lecture

[stillbrook]

this is awesome..i love your explaination....keep posting more like this

[DHANUNJAYANAIDUV]

How the transformer oil will come into contact with RTV silicone rubber used as a coating material for bushings?

[rsg]

Hi John, found your videos very Informative & comprehensive breakdown of bushings. Best way to learn is visual.

Would be great & am sure other engineers will highly appreciate if you can come up with Rmu, Transformer kiosk sub & substation?

[بوفارسبونورا-صه]

Can we consider the isolators in the pylons as bushings ?

[thetruelegend]

Very nice explanation,
Thank you, May Allah give you best return.

[crackerjack]

As well as a great insulator, Porcelain also helps in heat dissipation and the the smoother the surface (e.g. the Glaze) the better the heat transfer. Not saying these things get so hot that its necessary but ... from the design of the porcelain with the conical fins along its body suggest a necessity for heat dissipation surface areas.

[ThUnDaHuNtA_Australia]

you give the impression the inside space of the bushing is 'filled' with oil.
unless there is a bleed screw at the top of the airspace to vent the air to atmosphere under pressure of oil from the header tank there will always be some air in the internal bushing space.
not that it is a detrimental thing in relation to insulation effectiveness.
air will over time eventually dissolve and diffuse into the oil however with the low head of oil combined with low surface area this will occurr over a long period of time if at all.
the minimum insulation effectiveness is from the conductor at the bottom of the bushing to the body of the transformer casing.
from viewing the design of the transformer casing some air space appears to be of little or no consequence. regards Richard

[nabeelgaffar]

Jon, great videos. Can u do a video on Air release valve used in water transmission lines.