How To Drop Some Load In Case There Is The Mains Failure?

adindas

I have a switch boards which have got two supplies:
- Mains supply 800 KVA from utility company
- 500 Supply from standby Genset
There is Automatic mains failure (AMF). So in case there is a power failure, the generator is automatically kicking on.

But I have the following problem because my Genset can not take the full 800 KVA,
- I am aware that I could add Bus Couplers CB and divide it into essential/priority load and non essential/non priority load. And In case of power failure, the bus coupler will open and generator will only need to supply Essential load.

However, I do not want to do this as I prefer to do it by U/V relay and manual reclosing (for non motorised MCCB) or auto reclosing for motorised MCCB. I have the following situation. The switchboard is in building A. the Distribution board that I am going to drop in case og mains failure is in Building B. So instead of installing U/V realy in the outgoing ways of the switchboard, I want to install it in the Distribution board in building B (probly part of the distributionboard).

Is it possible to put U/V relay as part of the distrbution baord, or U/V relay have to be insatlled in the Main swich board ?

L. B. Condulet

This can be done quite easily with PLCs.