Stingers - Page 2 - Electrician Talk - Professional Electrical Contractors Forum
CLICK HERE AND JOIN OUR COMMUNITY TODAY, IT'S FREE!
Go Back   Electrician Talk - Professional Electrical Contractors Forum > Electrical Forum > General Electrical Discussion


Like Tree37Likes
Reply
 
Thread Tools Display Modes
Old 03-31-2017, 07:51 AM   #21
86 45 20
 
Southeast Power's Avatar
 
Join Date: Jan 2009
Location: Florida
Posts: 17,735
Rewards Points: 8,146
Default

Are you suggesting that a delta Wye transformer be installed or like micro stated to disconnect the MOV or other modifications to the drive?
Southeast Power is offline   Reply With Quote
Join Contractor Talk

Join the #1 Electrician Forum Today - It's Totally Free!

ElectricianTalk.com - Are you a Professional Electrical Contractor? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's the leading place for electricians to meet online. No homeowners asking DIY questions. Just fellow tradesmen who enjoy talking about their business, their trade, and anything else that comes up. No matter what your specialty is you'll find that ElectricianTalk.com is a great community to join. Best of all it's totally free!

Join ElectricianTalk.com - Click Here JOIN FOR FREE


Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ElectricianTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

Sponsored Links
Advertisement
 
Old 03-31-2017, 05:48 PM   #22
Senior Member
 
JRaef's Avatar
 
Join Date: Mar 2009
Location: SF Bay Area, California
Posts: 5,082
Rewards Points: 2,048
Default

Quote:
Originally Posted by Suncoast Power View Post
Are you suggesting that a delta Wye transformer be installed or like micro stated to disconnect the MOV or other modifications to the drive?
Exactly. If you have a Delta or HRG Wye system, you can disconnect the ground reference point of the MOVs, but then you also lose the L-G surge protection.

So another option is a Drive Isolation Transformer. That will give you a Wye secondary (regardless of whether there is a voltage change or not**), then ground the X0 terminal on the secondary. It has no effect on your entire plant-wide Delta or HRG grid, but it gives the VFD what it was made for.

** A lot of Drive Isolation Transformers are 1:1., no voltage change.
__________________
"If you don't know where you're going, then any direction will do." -- Lewis Carroll
JRaef is offline   Reply With Quote
The Following User Says Thank You to JRaef For This Useful Post:
splatz (03-31-2017)
Old 03-31-2017, 06:35 PM   #23
86 45 20
 
Southeast Power's Avatar
 
Join Date: Jan 2009
Location: Florida
Posts: 17,735
Rewards Points: 8,146
Default

Quote:
Originally Posted by JRaef View Post
Exactly. If you have a Delta or HRG Wye system, you can disconnect the ground reference point of the MOVs, but then you also lose the L-G surge protection.

So another option is a Drive Isolation Transformer. That will give you a Wye secondary (regardless of whether there is a voltage change or not**), then ground the X0 terminal on the secondary. It has no effect on your entire plant-wide Delta or HRG grid, but it gives the VFD what it was made for.

** A lot of Drive Isolation Transformers are 1:1., no voltage change.
This should be a sticky
MechanicalDVR likes this.
Southeast Power is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-02-2017, 01:13 AM   #24
Senior Member
 
Join Date: Jan 2014
Location: Colorado
Posts: 354
Rewards Points: 44
Default

Had a store that was a delta service and needed more outlets we just installed a delta/wye transformer with a 208 primary and did away with high leg.
FF301 is offline   Reply With Quote
Old 04-02-2017, 07:33 AM   #25
Old Grumpy Bastard
 
MechanicalDVR's Avatar
 
Join Date: Dec 2007
Location: "Old Dominion"
Posts: 59,296
Rewards Points: 1,008
Default

Quote:
Originally Posted by FF301 View Post
Had a store that was a delta service and needed more outlets we just installed a delta/wye transformer with a 208 primary and did away with high leg.
Sounds cost effective.
__________________
I'm as Christian as possible in the times we live in.

Always just a stallion in a china shop
MechanicalDVR is offline   Reply With Quote
Old 04-02-2017, 07:41 AM   #26
86 45 20
 
Southeast Power's Avatar
 
Join Date: Jan 2009
Location: Florida
Posts: 17,735
Rewards Points: 8,146
Default

Quote:
Originally Posted by FF301 View Post
Had a store that was a delta service and needed more outlets we just installed a delta/wye transformer with a 208 primary and did away with high leg.
Makes zero sense.
You missed April 1st by more than an hour.
You used the high leg to neutral for the primary and installed receptacles off of that?
Southeast Power is offline   Reply With Quote
Old 04-02-2017, 09:59 AM   #27
Senior Member
 
brian john's Avatar
 
Join Date: Mar 2007
Location: Gilbert's Corner VA
Posts: 29,907
Rewards Points: 1,586
Default

Quote:
Originally Posted by Suncoast Power View Post
Makes zero sense.
You missed April 1st by more than an hour.
You used the high leg to neutral for the primary and installed receptacles off of that?
There is no 208 primary as the phase to phase voltage is 240, NOW if they installed a 208/120 single phase which would require a FSS or 277 CB.

Or more likely if it was a delta=/wye a 2-1 transformer 240 to 208/120
__________________
Ah, but I was so much older then, I'm younger than that now
brian john is offline   Reply With Quote
Old 04-02-2017, 11:50 AM   #28
86 45 20
 
Southeast Power's Avatar
 
Join Date: Jan 2009
Location: Florida
Posts: 17,735
Rewards Points: 8,146
Default

Quote:
Originally Posted by brian john View Post
There is no 208 primary as the phase to phase voltage is 240, NOW if they installed a 208/120 single phase which would require a FSS or 277 CB.

Or more likely if it was a delta=/wye a 2-1 transformer 240 to 208/120
I could see, with some stretch of the imagination getting a feeder under the high leg lug and the other side to neutral if the high leg was underutilized.
I don't like doing that as in my mind the high leg to neutral is somewhat of an auto transformer traveling through a transformer and a half.
It's solid in theory but, we don't see it used like that here at all.

It seems desperate to me but, if you had control over the line and load taps they could do it.
Southeast Power is offline   Reply With Quote
Old 04-02-2017, 01:15 PM   #29
Senior Member
 
brian john's Avatar
 
Join Date: Mar 2007
Location: Gilbert's Corner VA
Posts: 29,907
Rewards Points: 1,586
Default

Quote:
Originally Posted by Suncoast Power View Post
I could see, with some stretch of the imagination getting a feeder under the high leg lug and the other side to neutral if the high leg was underutilized.
I don't like doing that as in my mind the high leg to neutral is somewhat of an auto transformer traveling through a transformer and a half.
It's solid in theory but, we don't see it used like that here at all.

It seems desperate to me but, if you had control over the line and load taps they could do it.
Right transformer for the job 240-208/120 even then there may be issues with loading the Hi-leg transformer due to sizing of the transformers.
__________________
Ah, but I was so much older then, I'm younger than that now
brian john is offline   Reply With Quote
Old 04-02-2017, 09:00 PM   #30
86 45 20
 
Southeast Power's Avatar
 
Join Date: Jan 2009
Location: Florida
Posts: 17,735
Rewards Points: 8,146
Default

Quote:
Originally Posted by brian john View Post
Right transformer for the job 240-208/120 even then there may be issues with loading the Hi-leg transformer due to sizing of the transformers.
Ok, one of those heavy epoxy transformers.
But, like you mentioned, if the lighting transformer is overloaded, it's another problem.
brian john likes this.
Southeast Power is offline   Reply With Quote
Old 04-03-2017, 12:56 PM   #31
Modérateur
 
frenchelectrican's Avatar
 
Join Date: Mar 2007
Location: Philippines
Posts: 8,635
Rewards Points: 16,782
Default

Quote:
Originally Posted by dmxtothemax View Post
The 208v high leg,
Does it have a practicle purpose ?
or is it just the unintended result of something else ?
Is it deliberately used anywhere ?

Why is it so ?


In USA side few members did hit on the spot with good information they posted.

I know there are few new delta service do show up a bit in Cebu Philippines but at my island Minado Islands we are mostly Wye system but yes we do see few new delta but only used with full load of motors but anything else we do use wye in most case.

Now ya say stingers ? sure we do have them here ., but the voltage is much higher useally about 410-416 volt range and once a while I will see some dolts try to use that connection for single phase load and not too pretty due most of the 240 volts items are not too well taken with 415 volt stingers.,,
Southeast Power likes this.
__________________
Bleu est beau.
frenchelectrican is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:28 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Our Pro Sites Network
ContractorTalk.com | DrywallTalk.com | HVACSite.com | PaintTalk.com | PlumbingZone.com | RoofingTalk.com