Electrical Basics

<Why is that Transformer yard is filled with Blue Metal sones.> Supply and demand. No-one wants to buy Blue Metal sones at the moment, and someone has made too many of them.

<What is the pirpose of RMU in electrical distribution. How is that related to HT panels (HT VCB panel, OCB panel etc.,)> http://www.acronymfinder.com/af-query.asp?Acronym=RMU&string=exact - now you define which 'RMU' you are talking about!

<What is HSD (High Speed Diesel) which is stored for Diesel Generator> No such thing; it's codswallop. The speed of a diesel engine is dictated by its throttle setting and its over-speed regulator, not by the fuel it uses.

<Why is that storage tank earthed?> Equipotential bonding, so that anyone that touches it doesn't get a belt from the static electricity generated by all that high-speed diesel rushing about....

<What is the basis of selection of type of breakers i.e on what basis ACB, OCB, VCB, MCCB (both LT & HT) is selected?> Local wiring regulations.

Good answers!

Looks like someones homework. I always thought the blue sones looked pretty.

I preferred the green ones from lasts years 'over production run'! Makes the place look kind of natural!

1. Blue Metal is the Copper sulpahate. It is high absorbant of moisture content and therefore is used to absorb the moisture and preventing shor circuit conditions . I dont think it si used in yard but it is used near the breather of the transformer.

2 . RMU Unit is used to ensure high degree of protectivity and reliabilty. If fault occurs in any one of the supply line still the transformers operate because it s connected with RMu Unit.

Hope this clears ur doubt

Cheers

You foreign people sure have some unusual jargon that we in the United States are not familiar with..

Ain't that the truth, some of then are damn funny as all get up.

Why none had replied on breakers selection???

Exact answer really good to every one

sir please send some detail explanation about rmu and its working

I'm guessing but do you mean "Blue Metal Stones"? Blue Metal Stones are crushed basalt rocks. They have a deep blue colour. They are commonly used as a road surface (5mm-10mm) in Australia. 0r as a loose surface in places such as your yard.(10-30mm) They keep the mud down when it's raining and is relatively cheap.

stones are used to reduce the vibration in transformer due to magnetriction and also absorbed the heat radiated by radiator during cooling of oil.