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 Feb 6 2010, 10:36 AM
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#1
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Ground Hand  Group: Members Posts: 68 Joined: 11-May 07 From: Texas Member No.: 4947 Industry: Power Union: IBEW Local 69  |
Ok you got yourself a CSP 120/240 transformer...
Lets say you wanted straight 240, so you move your ground strap to over to x3... With the breaker closed, you check voltage, x3 to x2, you get 120, x3 to x1 you get 240. If you open the breaker on this this CSP and check voltage... what do you think your gonna get? I'll give you a hint, don't do this on a CSP. -------------------- E * I = P
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Feb 6 2010, 10:52 AM
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#2
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 CATV is my life  Group: Moderator Group Posts: 2045 Joined: 24-January 09 From: Panama City Beach, Fl Member No.: 7790 Industry: CATV Union: no |
Come on Power guys this should be easy for you. Don't let a Cable Guy be right.
I guess....... you move the oscillating knibbling pin to the third phase shifting connector...... Just having fun... I would love to see some real guesses. Thanks for the post olo131 -------------------- "To err is human but to really screw up you need a computer"
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Feb 6 2010, 05:58 PM
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#3
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Lead Man Group: Members Posts: 196 Joined: 25-December 08 From: nor cal Member No.: 7474 Industry: Power Union: IBEW 1245 Journeyman Power Lineman |
QUOTE (rcdallas @ Feb 6 2010, 10:36 AM)  Ok you got yourself a CSP 120/240 transformer... Lets say you wanted straight 240, so you move your ground strap to over to x3... With the breaker closed, you check voltage, x3 to x2, you get 120, x3 to x1 you get 240. If you open the breaker on this this CSP and check voltage... what do you think your gonna get? I'll give you a hint, don't do this on a CSP. Why did you ground X3?That causes a phase to ground.... If I wanted 240v I would've used X1 and X3 and left X2 alone... And lastly...if you OPEN the pot ,how you gonna check voltage? I guess if you had backfeed you get a reading on you volt meter,but that's not telling you if your pots good or not! |
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Feb 6 2010, 08:35 PM
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#4
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Ground Hand Group: Members Posts: 68 Joined: 11-May 07 From: Texas Member No.: 4947 Industry: Power Union: IBEW Local 69 |
QUOTE (wood stabber @ Feb 6 2010, 06:58 PM) QUOTE (rcdallas @ Feb 6 2010, 10:36 AM) Ok you got yourself a CSP 120/240 transformer... Lets say you wanted straight 240, so you move your ground strap to over to x3... With the breaker closed, you check voltage, x3 to x2, you get 120, x3 to x1 you get 240. If you open the breaker on this this CSP and check voltage... what do you think your gonna get? I'll give you a hint, don't do this on a CSP. Why did you ground X3?That causes a phase to ground.... If I wanted 240v I would've used X1 and X3 and left X2 alone... And lastly...if you OPEN the pot ,how you gonna check voltage? I guess if you had backfeed you get a reading on you volt meter,but that's not telling you if your pots good or not! You ground the X3 or X1 so that you get straight 240... it'll give you a 240 hot leg to ground... we use that configuration on our street light circuits... If you open the breaker on a CSP in this type of configuration you'll end up with primary voltage due to the physical design of the CSP loosing a reference to ground with the ground strap not being on the X2 bushing. -------------------- E * I = P
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Feb 7 2010, 08:29 AM
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#5
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Lead Man Group: Members Posts: 196 Joined: 25-December 08 From: nor cal Member No.: 7474 Industry: Power Union: IBEW 1245 Journeyman Power Lineman |
QUOTE (rcdallas @ Feb 6 2010, 08:35 PM) QUOTE (wood stabber @ Feb 6 2010, 06:58 PM) QUOTE (rcdallas @ Feb 6 2010, 10:36 AM) Ok you got yourself a CSP 120/240 transformer... Lets say you wanted straight 240, so you move your ground strap to over to x3... With the breaker closed, you check voltage, x3 to x2, you get 120, x3 to x1 you get 240. If you open the breaker on this this CSP and check voltage... what do you think your gonna get? I'll give you a hint, don't do this on a CSP. Why did you ground X3?That causes a phase to ground.... If I wanted 240v I would've used X1 and X3 and left X2 alone... And lastly...if you OPEN the pot ,how you gonna check voltage? I guess if you had backfeed you get a reading on you volt meter,but that's not telling you if your pots good or not! You ground the X3 or X1 so that you get straight 240... it'll give you a 240 hot leg to ground... we use that configuration on our street light circuits... If you open the breaker on a CSP in this type of configuration you'll end up with primary voltage due to the physical design of the CSP loosing a reference to ground with the ground strap not being on the X2 bushing. Thanks,that's nice to know,you don't see to many CSP's out here in Cali,they have been changing them out to conventionals for a long time, pull the doors,drop the pot,hang a new pot,plug it in. So when you say you will get primary voltage,are you meaning the secondary side will read primary voltage ? |
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Feb 7 2010, 04:08 PM
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#6
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 Fallen Never Forgotten, Support our Troops Group: Moderator Group Posts: 3129 Joined: 25-July 06 Member No.: 2241 Industry: Telephone Union: TWU 202 |
QUOTE (rcdallas @ Feb 6 2010, 11:36 AM) Ok you got yourself a CSP 120/240 transformer... Lets say you wanted straight 240, so you move your ground strap to over to x3... With the breaker closed, you check voltage, x3 to x2, you get 120, x3 to x1 you get 240. If you open the breaker on this this CSP and check voltage... what do you think your gonna get? I'll give you a hint, don't do this on a CSP. I call over to the local POWER yard and offer to buy one of them a case of beer for hoooking it up for me, because Im just a phone guy that dont know sh*t about power -------------------- There may be old Linemen, There may be careless Linemen. There are however, no old, careless Linemen!
THANK A SOLDIER |
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Feb 7 2010, 04:14 PM
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#7
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 Line-God Group: Moderator Group Posts: 2023 Joined: 29-October 09 From: Clarksville, TN Member No.: 10276 Industry: CATV Union: No |
LOL@ Strange
-------------------- Jason C.
System Technician Senior Charter Communications Clarksville, TN |
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Feb 7 2010, 04:16 PM
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#8
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CATV is my life Group: Moderator Group Posts: 2045 Joined: 24-January 09 From: Panama City Beach, Fl Member No.: 7790 Industry: CATV Union: no |
Well Strange you could have still given a guess you know as much as I do when it comes to Power and I gave it a go!!!!
Hell LRod didn't even guess and he said he reads every post....... Maybe he will need to hit the books...... ![devil-smiley-024[1].gif](http://www.line-man.com/forums/style_emoticons/default/devil-smiley-024[1].gif) olo131 -------------------- "To err is human but to really screw up you need a computer"
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Feb 7 2010, 04:23 PM
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#9
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Line-God Group: Moderator Group Posts: 2023 Joined: 29-October 09 From: Clarksville, TN Member No.: 10276 Industry: CATV Union: No |
I'm gonna go with nothing since it's open. :)
-------------------- Jason C.
System Technician Senior Charter Communications Clarksville, TN |
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Feb 7 2010, 04:52 PM
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#10
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 Line-God Group: Moderator Group Posts: 3005 Joined: 1-February 04 From: New Brunswick, Canada Member No.: 147 Industry: Power Union: I.B.E.W. Local 37 |
QUOTE (wood stabber @ Feb 6 2010, 05:58 PM) QUOTE (rcdallas @ Feb 6 2010, 10:36 AM) Ok you got yourself a CSP 120/240 transformer... Lets say you wanted straight 240, so you move your ground strap to over to x3... With the breaker closed, you check voltage, x3 to x2, you get 120, x3 to x1 you get 240. If you open the breaker on this this CSP and check voltage... what do you think your gonna get? I'll give you a hint, don't do this on a CSP. Why did you ground X3?That causes a phase to ground.... If I wanted 240v I would've used X1 and X3 and left X2 alone... And lastly...if you OPEN the pot ,how you gonna check voltage? I guess if you had backfeed you get a reading on you volt meter,but that's not telling you if your pots good or not! I can see the 240V no problem, you have hot on one end and ground on the other end of you windings as you do with primary as the x3 acts the same as your h2. Do you know why you get line voltage on the secondary winding, we have alot of 240V streelight circuits on the housing areas of the local military base. I don't know if any CSP's are feeding it though but we still have a few thousand CSP's in our system. -------------------- Live Safe, Live Long.
lightningrod |
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Feb 7 2010, 05:02 PM
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#11
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CATV is my life Group: Moderator Group Posts: 2045 Joined: 24-January 09 From: Panama City Beach, Fl Member No.: 7790 Industry: CATV Union: no |
QUOTE (olo131 @ Feb 7 2010, 06:16 PM) Hell LRod didn't even guess and he said he reads every post....... Maybe he will need to hit the books...... olo131 QUOTE (Lightningrod @ Feb 7 2010, 06:52 PM) I can see the 240V no problem, you have hot on one end and ground on the other end of you windings as you do with primary as the x3 acts the same as your h2. Do you know why you get line voltage on the secondary winding, we have alot of 240V streelight circuits on the housing areas of the local military base. I don't know if any CSP's are feeding it though but we still have a few thousand CSP's in our system. Looks like peer pressure to me!!!!!! olo131 -------------------- "To err is human but to really screw up you need a computer"
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Feb 7 2010, 05:06 PM
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#12
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Line-God Group: Moderator Group Posts: 2023 Joined: 29-October 09 From: Clarksville, TN Member No.: 10276 Industry: CATV Union: No |
Do we have an answer yet lol?? I'm kinda curious to know lol.
-------------------- Jason C.
System Technician Senior Charter Communications Clarksville, TN |
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Feb 7 2010, 09:37 PM
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#13
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Ground Hand Group: Members Posts: 68 Joined: 11-May 07 From: Texas Member No.: 4947 Industry: Power Union: IBEW Local 69 |
QUOTE (wood stabber @ Feb 7 2010, 08:29 AM) QUOTE (rcdallas @ Feb 6 2010, 08:35 PM) QUOTE (wood stabber @ Feb 6 2010, 06:58 PM) QUOTE (rcdallas @ Feb 6 2010, 10:36 AM) Ok you got yourself a CSP 120/240 transformer... Lets say you wanted straight 240, so you move your ground strap to over to x3... With the breaker closed, you check voltage, x3 to x2, you get 120, x3 to x1 you get 240. If you open the breaker on this this CSP and check voltage... what do you think your gonna get? I'll give you a hint, don't do this on a CSP. Why did you ground X3?That causes a phase to ground.... If I wanted 240v I would've used X1 and X3 and left X2 alone... And lastly...if you OPEN the pot ,how you gonna check voltage? I guess if you had backfeed you get a reading on you volt meter,but that's not telling you if your pots good or not! You ground the X3 or X1 so that you get straight 240... it'll give you a 240 hot leg to ground... we use that configuration on our street light circuits... If you open the breaker on a CSP in this type of configuration you'll end up with primary voltage due to the physical design of the CSP loosing a reference to ground with the ground strap not being on the X2 bushing. Thanks,that's nice to know,you don't see to many CSP's out here in Cali,they have been changing them out to conventionals for a long time, pull the doors,drop the pot,hang a new pot,plug it in. So when you say you will get primary voltage,are you meaning the secondary side will read primary voltage ? Yes... you'll end up with primary voltage out the secondary bushings in that configuration. We don't have many CSP's out here anymore on our system, but you'll come across them every now and then. -------------------- E * I = P
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Feb 7 2010, 09:46 PM
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#14
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Ground Hand Group: Members Posts: 68 Joined: 11-May 07 From: Texas Member No.: 4947 Industry: Power Union: IBEW Local 69 |
QUOTE (Lightningrod @ Feb 7 2010, 04:52 PM) QUOTE (wood stabber @ Feb 6 2010, 05:58 PM) QUOTE (rcdallas @ Feb 6 2010, 10:36 AM) Ok you got yourself a CSP 120/240 transformer... Lets say you wanted straight 240, so you move your ground strap to over to x3... With the breaker closed, you check voltage, x3 to x2, you get 120, x3 to x1 you get 240. If you open the breaker on this this CSP and check voltage... what do you think your gonna get? I'll give you a hint, don't do this on a CSP. Why did you ground X3?That causes a phase to ground.... If I wanted 240v I would've used X1 and X3 and left X2 alone... And lastly...if you OPEN the pot ,how you gonna check voltage? I guess if you had backfeed you get a reading on you volt meter,but that's not telling you if your pots good or not! I can see the 240V no problem, you have hot on one end and ground on the other end of you windings as you do with primary as the x3 acts the same as your h2. Do you know why you get line voltage on the secondary winding, we have alot of 240V streelight circuits on the housing areas of the local military base. I don't know if any CSP's are feeding it though but we still have a few thousand CSP's in our system. I posted it previously... it's just the physical design of the CSP, when you open the breaker it breaks physical contact between X3 and X1 and X2 stays closed. We will use the straight 240, and where a photocell/relay is needed for 120 we'll use the 120v to power it, at one time someone was shootin some trouble checking voltage it burned their volt meter up... later on they used phasing sticks and seen there was primary voltage.. thankfully noone hurt. Some shiznit to think about it. -------------------- E * I = P
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Feb 8 2010, 06:37 AM
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#15
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Lead Man Group: Members Posts: 192 Joined: 30-August 05 Member No.: 849 Industry: Power |
QUOTE (rcdallas @ Feb 8 2010, 12:46 AM) QUOTE (Lightningrod @ Feb 7 2010, 04:52 PM) QUOTE (wood stabber @ Feb 6 2010, 05:58 PM) QUOTE (rcdallas @ Feb 6 2010, 10:36 AM) Ok you got yourself a CSP 120/240 transformer... Lets say you wanted straight 240, so you move your ground strap to over to x3... With the breaker closed, you check voltage, x3 to x2, you get 120, x3 to x1 you get 240. If you open the breaker on this this CSP and check voltage... what do you think your gonna get? I'll give you a hint, don't do this on a CSP. Why did you ground X3?That causes a phase to ground.... If I wanted 240v I would've used X1 and X3 and left X2 alone... And lastly...if you OPEN the pot ,how you gonna check voltage? I guess if you had backfeed you get a reading on you volt meter,but that's not telling you if your pots good or not! I can see the 240V no problem, you have hot on one end and ground on the other end of you windings as you do with primary as the x3 acts the same as your h2. Do you know why you get line voltage on the secondary winding, we have alot of 240V streelight circuits on the housing areas of the local military base. I don't know if any CSP's are feeding it though but we still have a few thousand CSP's in our system. I posted it previously... it's just the physical design of the CSP, when you open the breaker it breaks physical contact between X3 and X1 and X2 stays closed. We will use the straight 240, and where a photocell/relay is needed for 120 we'll use the 120v to power it, at one time someone was shootin some trouble checking voltage it burned their volt meter up... later on they used phasing sticks and seen there was primary voltage.. thankfully noone hurt. Some shiznit to think about it. True... because of the design of a CSP opening the breaker on a CSP does does de-energize the secondary coil but an induced voltage will develop on the coil. It can reach the potential of the primary coil we're talking mili amps though. When using a fluke multimeter you can destroy it(and I have ) by testing across the bushings with the secondary breaker in the open position. Always better to use an ellwood. To clear thing up on grounding a secondary coil.... A secondary coil can take ONE ground. The transformer could care less if its x1, x2, or x3. When building a straight 240 bank the ground straps are omited. We ground one of the hotlegs in this case. Your phase to phase voltage on any two hotlegs will be 240 but your voltage from the grounded hotleg to ground will of cource be zero. |
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Feb 8 2010, 10:49 AM
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#16
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Lead Man Group: Members Posts: 192 Joined: 30-August 05 Member No.: 849 Industry: Power |
QUOTE (System Tech Senior @ Feb 7 2010, 08:06 PM) Do we have an answer yet lol?? I'm kinda curious to know lol. I just answered it two posts ago in this thread.When you open the breaker on a csp an induced voltage will develop on the secondary coil. the voltage can reach the potential of the primary coil. the current produced is in miliamps. not enough to hurt someone but certainly enough to dammage a fluke multimeter.
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Feb 8 2010, 03:29 PM
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#17
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Line-God Group: Moderator Group Posts: 2023 Joined: 29-October 09 From: Clarksville, TN Member No.: 10276 Industry: CATV Union: No |
So when I answered with nothing was I right?
-------------------- Jason C.
System Technician Senior Charter Communications Clarksville, TN |
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