ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
IRC M1307.3
by gfretwell. 08/18/18 09:08 AM
Light Pole Grounding
by Mosfet74. 08/18/18 08:42 AM
Calling all Non-US members!! (Non-US only)
by Bill Addiss. 08/13/18 05:52 PM
Upgrade the old panel
by gfretwell. 08/13/18 12:20 AM
depth of duckbank
by ghost307. 08/12/18 09:26 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 3 guests, and 21 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Synchronous condensers #130446
05/12/06 05:52 PM
05/12/06 05:52 PM
W
WFO  Offline OP
Member
Joined: Sep 2005
Posts: 202
Cat Spring, TX
I understand the concepts of inductive and capacitive reatance and their effect on each other (as well as their effect on power factor). What I don't understand is how overexciting the DC field of a synchronous condenser actually creates a leading condition on what would normally be considered an inductive device.

Tools for Electricians:
Re: Synchronous condensers #130447
05/19/06 05:34 PM
05/19/06 05:34 PM
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,708
Anaheim, CA. USA
WFO,

Sorry to take so long for a reply, but here's a bit 'O information regarding Synchronous Motors used as Synchronous Condensers.
Hope it's helpful and useful - let me know if you have additional Questions.

Synchronous Motors have been used on account of their ability to raise the Power Factor of Systems having large Induction Motor loads, since the Power factor of such systems is frequently quite low.
In many cases, however, they may cost less and have higher efficiencies than the corresponding induction motor. This is especially true for low speed motors.

Many Synchronous Motors are designed to run at Unity Power Factor; i.e., sufficient excitation is supplied to meet the requirements of the motor only, and no reactive current is either drawn from or supplied to the power system.

In the case when it is desirable to have the Synch. Motor furnish a part of the reactive current required by the system (to bring it into / close to unity power factor), the motor is designed to operate at 80% LEADING Power Factor, and draw currents which LEADS the Voltage rather than Lags the Voltage - as is the case with Induction Motors and Transformers.
For this, the Synch. Motor gets greater excitation than that necessary for unity power factor.

The power factor correction is accomplished by resolving all currents into energy and reactive components, and taking the algebraic sums of each separately, or by means of a vector diagram.

It's been a long time for me, and the old "Database" in my head is very dusty!, so let me do some research and make an additional reply later.

If I forget to do so by Saturday Evening, send me a threatening reply and/or E-mail!
[Linked Image]

email address is encapsulated between quotes and spaces. Just remove the overburden for the actual address:

" set electric at pac bell dot net "

Scott35


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Tom
Tom
Shinnston, WV USA
Posts: 1,044
Joined: January 2001
Show All Member Profiles 
Top Posters(30 Days)
BigB 3
Popular Topics(Views)
248,623 Are you busy
186,362 Re: Forum
175,828 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.014s Queries: 14 (0.004s) Memory: 0.9444 MB (Peak: 1.0590 MB) Zlib enabled. Server Time: 2018-08-19 09:45:16 UTC