Synchronous generators in series with UPS

Question

Synchronous generators in series with UPS

mattc (Electrical)

(OP)

7 Jul 99 20:57

Having read about harmonic interaction within exciter fields due to UPS, I'm wondering if anyone has real world experience in operating gensets with UPS gear (poly or single phase). If you can also suggest reactors that are commonly used to correct over voltage conditions within the gen, that would be helpful. Thanks in advance.
-mc

ELECTRICKEN (Electrical) · Answer 1 · 1999-09-19 09:04:28

A Y-DELTA TRANSFORMER BETWEEN THE LOAD AND SUPPLY WILL TAKE
CARE OF MOST PROBLEMS,IF YOUR MAIN CONCERN IS THE LOAD SERVED."DEPENDING ON THE TYPE OF HARMONIC"
IF YOUR CONCERN IS VOLTAGES IN THE GENSET THE Y-DELTA CAN ALSO BE PLACED ON THE LOAD SIDE OF THE UPS.
THE WAY THE SYSTEM IS GROUNDED IS ALSO IMPORTANT.
THE POWER COMPANY ENGINEERS ARE WILLING TO HELP WITH THIS
TYPE OF PROBLEM.I WOULD ALSO CHECK THE COMPANIES THAT SUPPLIED THE EQUIPMENT.

mattc (Electrical) · Answer 2 · 1999-09-19 13:16:09

Uhhh, thanks...I guess...right...the manufacturer....salesmen....underqualified staff....oh wait, the power company....if only they subscribed to this website so they could post a detailed technical answer....that would be too easy. But you're right to electrically isolate the load. Isonchronous govenors on the prime mover help too. Why?

ELECTRICKEN (Electrical) · Answer 3 · 1999-09-19 20:48:26

I don't know the Why?
I thought maybe you wanted general ideas "Sorry"
I've heard there is a company in California that builds a kit add-on for your exicter problem , don't know if it works
or not,or the name of the company.
The system's I've worked on gen,ups,& harmonic trouble.
Independent Ups. 120v models seem to be the worst, multiple units on the same phase."Again I don't why" they multpiply
the hormonic on the system causing exicter burnout,I've seen
the Ups's melt each other under these conditions.
I was able to fix this with transformers,208/240v Ups,change
the grounding between systems utility,gen,ups.The required
grounding under local and national electrical code "us" does nothing but make harmonics grow and move!

Come Join Us!

Posting Guidelines

Synchronous generators in series with UPS