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alehman , i mean by my question links or softwrae can calculate the rates .

if we have 3 generators 400v ,2MVA each and we step up using 3 transformers 400/22kv ,2Mva each can we use 2 step down transformer each 4 MVA if i have maximum load =8MVA or we use 3 or 4 transformers with 2MV. 1-MY question exactly can i design step down transformer its rate is bigger than...

i need any recommended specifications for waste heat boiler weigh 15000 kg and above if any links for this issue i will be thankfull .

thanks for all replies

how to calculate bus bar ,cables, switch gear ,circuit breaker rated current?

what is the differnce in costs ,operation and maintenance ?

what is the difference between the dry type transformer and the oil type transformer in medium voltage ? which is more economicaly and safty ?if any manuals or links serve this issue i'll be so thankfull

thankfull for all replies and specially for cuky2000

i need any manual for switch gear,cables,cubeicals periodic maintenance ?

i'm recently graduated engineer and i want to know what the difference between the following in using ? the switchgear and the circuitbreaker miniture c.b and moulded case c.b sectionlizer and bus coupler sf6 and vacuum c.b and thanks