Lt Breaker Design

While designing LT Circuit breakers the breaking capacity and short circuit of the breaker depends on what factors. incoming supply is feeding through 16 MVA power transformer .

Static Transfer Switch

how the static transfer switch functions and how it transfers the load without interruption ?

Frequency

how the transformer size will decrease when the operating frequency is increased ? and what are the factors effect the size of transformer when frequency increased ? ,when frequency increase what changes will occur related to size in an alternator and ac motor ?

Ngr

we are having 16 MVA 33/11 kv power transformer . delta/ star connection. the neutral from secondary is grounded through a NGR of 15.88 ohm , 400 amps. we are having different kilowatt rating motors. my doubt is for a 75 kw rating motor what should the earth conductor size (body earth ) and on what bassis the earth conductor size will decide.............

Ring Main Unit

what is ring main unit ? ia there any difference between switchgear and rmu