To Parellel or Not to Parellel

[Cookie]

If you had to provide onsite power via generators, how would you design the system? Parallel the gens or have them run the building in separately divided systems? 100kw units will go to 200kw providing full back-up to 1A and 2A.

 

[pc1966]

I'm afraid I have never used such large generators to know if they can be paralleled and safely run in sync and load-share properly. And not be damaged by 'motoring' if one runs out of fuel before its brothers/sisters.

I hope that many of them can, but no idea!

 

[marconi]

100kw units will go to 200kw providing full back-up to 1A and 2A.

Please could you clarify what you mean to say by this sentence?

Parallel operation at this small scale is best when the sets are identical in all respects and indeed suited to parallel operation. A 100 with a 200 kW set does not then meet this.

kW or kVA? What Power Factor?

 

[Pete999]

If you had to provide onsite power via generators, how would you design the system? Parallel the gens or have them run the building in separately divided systems? 100kw units will go to 200kw providing full back-up to 1A and 2A.


View attachment 64445

Synchronise the outputs of the Stand By sets, feed them outputs to local B/bars and load share via the required synchronising apparatus.

 

[Cookie]

I'm afraid I have never used such large generators to know if they can be paralleled and safely run in sync and load-share properly. And not be damaged by 'motoring' if one runs out of fuel before its brothers/sisters.

I hope that many of them can, but no idea!

You can with paralleling switchgear. These aren't that large... try 3000kw.


Polarized face >> ?

 

[Cookie]

100kw units will go to 200kw providing full back-up to 1A and 2A.

Please could you clarify what you mean to say by this sentence?

Parallel operation at this small scale is best when the sets are identical in all respects and indeed suited to parallel operation. A 100 with a 200 kW set does not then meet this.

kW or kVA? What Power Factor?

The units are rated 0.8 PF. Load PF will be a bit higher than that.

The 100kw units are being replaced with 200kw units so when gen 1A or 2A fails the ATS can automatically transfer to 1B or 2B without overloading them.

 

[freddo]

Nice, the last larger setup I saw had a 650kVA and 250kVA sets. Speeds manually adjusted by the user to get them both in sync, watching 3 indicator lamps, then a button pushed to close a contactor between them. No interlocking, get it wrong and it's a big bang! Paralleling is a good way to go for a more rugged supply.

 

[Cookie]

What happens when a gen trips off line? How is load shared between the two without one drifting off?