What is a star-delta starter?

A star-delta or star-triangle starter is a device used to reduce the startup current of large three phase motors. Although they are nowadays often no longer neccesary due to the use of solid state electronics, I thought they'd be interesting enough to talk about in a video.

(AKIO TV) MMXXI

[idiotdrummer]

Just came across this video, and it brought back so many memories. I started to serve my apprenticeship as an electrician in 1977 in Harland & Wolff shipyard, Belfast, so you can appreciate that electric motors were a large part of our work. I remember we had a S/D motor in the training centre, where the switch was manually thrown to the left (star) to start, then after a few seconds you had to throw the lever to the right (delta) where it would stay during run. I also saw other models where there was a centrifugal switch on the shaft which changed the winding from star to delta.
Great video, many thanks.

[TechySubhadip]

Brother you are doing a great job. Keep making such great educational videos. Its very helpful for students.

[stefantoftsrensen]

Hey. You are definetly my favourite to explain different electric phenomenouns

I've just started my apprenticeship to get tought up as a When i was disassebling a large generator, that had decided to selfdestruct after a bearing got worn down from not beeing serviced, I noticed that there was what looked like a small generator inside the large generator. I asked my boss and he had to admit he actually didnt know what it was for. My guess later ended up beeing that it was an alternative to having brushes power the exciter coils. I looked it up a bit and it seems I was right, but couldnt really find a clear answer and explanation that would help me get a more full understanding. I really want to understand all the stuff about the AVR and the different configurations generators run to maintain the 50 hz frequency and voltage most effeciently.

Hope you want to help :)