low voltage switchgear in Hydro powerplant

DEAR<
simple reason that different supplies on in coming side are not in synch. mode, i.e. not in same phase. if paralleled, short circuits will occur in control section.

yeah..dis one i know harry..i also replied this only to my boss..he said...no we may connect tahem in parallel for once...but it can create a disaster..

can u plz expalin me in detail ..i mean more elaborate ..

abt parapplel connection n all.

Dear Friend,

Can you tell us what type of hydropower, we are about to comment. Is it micro, mini, small and large (above 10MW) hydro power plant?

Full proofing interlock with LV (Swgr & Transfo) should be done and should never be in paralleled in above 10MW hydropower. But, in mini down to micro, transfo paralleling can be done in LV side only. Many rated combined power (MW) plant are splitted into equal turbine generator; for example if the calculated "Q" gives you a 3MW then you can split this to 3 equal turbine generator, which is 3x1000kW. Then, the output of these 3 TG can be synchronized or paralleled into one (1) 3500kVA transformer. Some small hydro power project are doing this except for the large one.

The station and feeder transformers, which is LV power is not required a full proof interlock. Only control and protection system is requied.

Eren

yeah ... m talking about mega hydroproject.. i.e. above 500 MW.

To avoid this: