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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#41
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Two phases or not?
"David Nebenzahl" wrote in message s.com... Well, it really shouldn't be like that. I mean, look, we're discussing a well-known, measurable phenomenon. The output of the center-tapped transformer can be demonstrated to supply two separate and distinct phases. Hell, hook up two 'scopes and see what they show. It's just that the 'lectric-heads--the lunks who install distribution panels and such--won't let us *call* it "2-phase" for several dubious reasons. Doesn't change the fact that it IS two-phase power. That's what I'm getting at. I'm not trying to force anyone to change their terminology or give up their superstitious beliefs; I know that that's futile. "Wild_Bill" wrote in message ... You're free to call it whatever you like.. and everyone that hears you call single-phase items 2-phase instead, is free to find humor in it, or suspect that you're uninformed, or lesser of you (without giving you any indications). Kinda like referring to an item with a perfectly practical/widely familar name "a thingy", or a (something) thingy. Superstitious would be applicable in the early years of the last century when folks actually believed that distributed electricity was "fire on a wire". It was a mysterious power to be feared by many folks in backwoods/mountain places in Appalachia for a significant portion of last century, and that same term can be heard in documentary films of that area of the country. Think what you like, but if you present yourself as being wiser or more reasonable wrt the subject, it's essentially just trolling.. and since you study proper usenet protocol, you know that's the equivalent to numerous simultaneously performed deadly sins. It's likely no one gives a FRA what you prefer to call single-phase, however, many usenet folks will likely continue to attempt to correct you at your use of the term 2-phase, primarily because it's not applicable to the subject matter.. and just because 2-phase power is essentially non-existent. As I suggested in my first reply in this thread.. essentially debated to hell'n back, and still, there are still those defending the use of the term 2-phase. -- Cheers, WB ............. Oh I completely agree that the terminology is split phase and or center tapped.. Just after reading all of this I am trying to rationalize why there is so much debate.. I mean they are different phases 180deg apart. That is measurable. I just cant understand why some refuse the fact that they are 2 different phases, i.e. "split-phase" as the name implies. This fits the definiton of a different phase of power. Im not trying to change any terminology in the process here. Mike |
#42
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Two phases or not?
Oh I completely agree that the terminology is split phase and or center tapped.. Just after reading all of this I am trying to rationalize why there is so much debate.. I mean they are different phases 180deg apart. That is measurable. *I just cant understand why some refuse the fact that they are 2 different phases, i.e. "split-phase" as the name implies. This fits the definiton of a different phase of power. Im not trying to change any terminology in the process here. MIke et al The problem seems to be that after all this dialogue, that so many of the responders simply don't stick to the basic premise that different phases by definition have timing differences. Simply reversing the way of using a phase does not make it a different phase. The timing stays the same. If one uses an oscillioscope to view the phase it can be readily reversed to appear as another when it is not. We connect windings in the power transformer that feeds our residence to get the desired result, 120 or 240 and connect the common point to accomplish another desired result. Safety. Also the ungrounded winding would be floating about a possible potential of several thousand volts and be a real hazard should there be a problem in any of the many devises connected to the secondary. Including the two seconday windings. And yes there are two identical secondary windings. If there were not our electric bills would at least double. Lots of folks would die and lots of devises would be hazardous to all. Thus the emphasis on proper grounding in the interests of public welfare. But this is another subject. Bob AZ |
#43
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Two phases or not?
"Bob AZ" The problem seems to be that after all this dialogue, that so many of the responders simply don't stick to the basic premise that different phases by definition have timing differences. ** More total nonsenese. Sine waves of the exact same frequency and amplitude can ONLY differ only in phase. A 180 degree phase difference is as good as any other. .... Phil |
#44
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Two phases or not?
In article ,
"Phil Allison" wrote: Sine waves of the exact same frequency and amplitude can ONLY differ only in phase. A 180 degree phase difference is as good as any other. Phil- I have a flashlight powered by a two-phase system - two D cells. It certainly fits your criteria. Its power system can also be considered AC, since DC is just AC with frequency equal to zero. Facts are no deterrent to a persistent troll! Fred |
#45
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Two phases or not?
"Fred McKenzie" "Phil Allison" Sine waves of the exact same frequency and amplitude can ONLY differ only in phase. A 180 degree phase difference is as good as any other. I have a flashlight powered by a two-phase system - two D cells. ** Nuh - that is DC, you pathetic troll. It certainly fits your criteria. ** Nuh - not one of them. Its power system can also be considered AC, since DC is just AC with frequency equal to zero. ** Just like white is the same as black with no lights on. Facts are no deterrent to a persistent troll! ** Just like reality is no deterrent to a lunatic. Did someone leave the door open at the asylum today ?? ...... Phil |
#46
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Two phases or not?
On Thu, 27 Jan 2011 11:19:54 +1100, Phil Allison wrote:
"Fred McKenzie" "Phil Allison" Sine waves of the exact same frequency and amplitude can ONLY differ only in phase. A 180 degree phase difference is as good as any other. I have a flashlight powered by a two-phase system - two D cells. ** Nuh - that is DC, you pathetic troll. It certainly fits your criteria. ** Nuh - not one of them. Its power system can also be considered AC, since DC is just AC with frequency equal to zero. ** Just like white is the same as black with no lights on. Facts are no deterrent to a persistent troll! ** Just like reality is no deterrent to a lunatic. Did someone leave the door open at the asylum today ?? I'd make a comment here but it is against my new year's resolution. -- Live Fast, Die Young and Leave a Pretty Corpse |
#47
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Two phases or not?
Wild_Bill wrote:
Having a couple of decades experience in servicing/repair of commercial and consumer electronic equipment and additional training and experience in industrial site experience (both electrical and electronic circuits), I have never seen descriptions or designations stated as 2-phase, for any type of transformer. Or: Hey bub, you gotta single-phase-in, 2-phase-out transformer? But I have seen and used transformers with multiple taps, on both pri and sec sides. The number of taps on either side of a single-phase transformer don't change the output(s) to 2-phase, regardless of how many there are (pri or sec side). Monophase sounds odd, like it's not related to electricity. How about uniphase? Yep, found an example (and diphase) used in a book c 1905. Electricity In Every-day Life Edwin J. Houston PhD. You know that's gonna be interesting just because it was authored by a PhD. -- Cheers, WB ............. You still lose: You don't seem to know the difference between circuits and phase angles.. Typical residential hack electrician.. I hope you don't ever decide to move in to electronics, you'd be in a world of ****. |
#48
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Two phases or not?
Fred McKenzie wrote:
In article , "Phil Allison" wrote: Sine waves of the exact same frequency and amplitude can ONLY differ only in phase. A 180 degree phase difference is as good as any other. Phil- I have a flashlight powered by a two-phase system - two D cells. It certainly fits your criteria. Its power system can also be considered AC, since DC is just AC with frequency equal to zero. Facts are no deterrent to a persistent troll! Fred What are you a ****ing moron? |
#49
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Two phases or not?
"Jamie" = radio ham KA1LPA Fred McKenzie = radio ham K4DII I have a flashlight powered by a two-phase system - two D cells. It certainly fits your criteria. Its power system can also be considered AC, since DC is just AC with frequency equal to zero. Facts are no deterrent to a persistent troll! Fred What are you a ****ing moron? ** Yep - Fred is another radio ham. K4DII Frederick M. McKenzie 2867 EPP Bivings Drive Titusville, Fl 32796 ...... Phil |
#50
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Two phases or not?
"Jamie" = radio ham KA1LPA
Fred McKenzie = radio ham K4DII I have a flashlight powered by a two-phase system - two D cells. It certainly fits your criteria. Its power system can also be considered AC, since DC is just AC with frequency equal to zero. Facts are no deterrent to a persistent troll! Fred What are you a ****ing moron? ** Yep - Fred is another radio ham. K4DII Frederick M. McKenzie 2867 EPP Bivings Drive Titusville, Fl 32796 Look Phil, I may not agree with avery thing you say, but at least I am supporting you in this debate... ** Yawnnnnnnn.... And please don't use amateur operators as a signification of stupidity.. ** Shame that so many radio hams on usenet prove themselves to be the biggest trolls, trouble makers and blow hard bull**** artists ever. Damn shame about that. ..... Phil |
#51
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Two phases or not?
Phil Allison wrote:
"Jamie" = radio ham KA1LPA Fred McKenzie = radio ham K4DII I have a flashlight powered by a two-phase system - two D cells. It certainly fits your criteria. Its power system can also be considered AC, since DC is just AC with frequency equal to zero. Facts are no deterrent to a persistent troll! Fred What are you a ****ing moron? ** Yep - Fred is another radio ham. K4DII Frederick M. McKenzie 2867 EPP Bivings Drive Titusville, Fl 32796 ..... Phil Look Phil, I may not agree with avery thing you say, but at least I am supporting you in this debate... And please don't use amateur operators as a signification of stupidity.. You can't fix stupid, It has no classification. And admit it Phil, you just wish you were a HAM! http://www.youtube.com/watch?v=5Z9136_Nhh4 Watch and Weep! Jamie |
#52
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Two phases or not?
"Jamie" = radio ham KA1LPA And please don't use amateur operators as a signification of stupidity.. ** Shame that so many radio hams on usenet prove themselves to be the biggest trolls, trouble makers and blow hard bull**** artists ever. Especially YOU. Damn shame about that. ..... Phil |
#53
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Two phases or not?
Phil Allison wrote:
"Jamie" = radio ham KA1LPA Fred McKenzie = radio ham K4DII I have a flashlight powered by a two-phase system - two D cells. It certainly fits your criteria. Its power system can also be considered AC, since DC is just AC with frequency equal to zero. Facts are no deterrent to a persistent troll! Fred What are you a ****ing moron? ** Yep - Fred is another radio ham. K4DII Frederick M. McKenzie 2867 EPP Bivings Drive Titusville, Fl 32796 Look Phil, I may not agree with avery thing you say, but at least I am supporting you in this debate... ** Yawnnnnnnn.... And please don't use amateur operators as a signification of stupidity.. ** Shame that so many radio hams on usenet prove themselves to be the biggest trolls, trouble makers and blow hard bull**** artists ever. Damn shame about that. .... Phil Oh, I didn't know you were a ham yourself ? That would explain why you have such animosity towards us, you speak from experience. --... ...-- ... Thou sayest, "Keep the brother hood together"! Jamie |
#54
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Two phases or not?
Phil Allison wrote:
"Jamie" = radio ham KA1LPA And please don't use amateur operators as a signification of stupidity.. ** Shame that so many radio hams on usenet prove themselves to be the biggest trolls, trouble makers and blow hard bull**** artists ever. Especially YOU. Damn shame about that. .... Phil Making assumptions like that about some one you know absolutely nothing about, isn't very good character on your part. It just goes to show how much of an ignoramus one could be, you for example. Now, I understand your dilemma. I am forced to communication with people of your type, every day. That does not mean I have to like it how ever, it's a requirement I must adhere to. Could it be these so called "Trouble Makers" as you call them are just making you feel like you have too much competition ? I am sorry that "we Amateur Operators don't kneel down and kiss your feet". Jamie P.S. It's not nice trying to make yourself look better by devaluing others. hint. |
#55
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Two phases or not?
MIke et al
The problem seems to be that after all this dialogue, that so many of the responders simply don't stick to the basic premise that different phases by definition have timing differences. Simply reversing the way of using a phase does not make it a different phase. The timing stays the same. Ok I get what your saying.. But do you understand what a phanse difference is?? It is timing like you said.. Here is an explanation using audio waves. Maybe you can get what I am saying. http://www.indiana.edu/~emusic/acoustics/phase.htm |
#56
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Two phases or not?
Jamie wrote: Wild_Bill wrote: Having a couple of decades experience in servicing/repair of commercial and consumer electronic equipment and additional training and experience in industrial site experience (both electrical and electronic circuits), I have never seen descriptions or designations stated as 2-phase, for any type of transformer. Or: Hey bub, you gotta single-phase-in, 2-phase-out transformer? But I have seen and used transformers with multiple taps, on both pri and sec sides. The number of taps on either side of a single-phase transformer don't change the output(s) to 2-phase, regardless of how many there are (pri or sec side). Monophase sounds odd, like it's not related to electricity. How about uniphase? Yep, found an example (and diphase) used in a book c 1905. Electricity In Every-day Life Edwin J. Houston PhD. You know that's gonna be interesting just because it was authored by a PhD. -- Cheers, WB ............. You still lose: You don't seem to know the difference between circuits and phase angles.. Typical residential hack electrician.. I hope you don't ever decide to move in to electronics, you'd be in a world of ****. Still trying to find people to join you? -- You can't fix stupid. You can't even put a band-aid on it, because it's Teflon coated. |
#57
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Two phases or not?
Jamie wrote: Phil Allison wrote: "Jamie" = radio ham KA1LPA Fred McKenzie = radio ham K4DII I have a flashlight powered by a two-phase system - two D cells. It certainly fits your criteria. Its power system can also be considered AC, since DC is just AC with frequency equal to zero. Facts are no deterrent to a persistent troll! Fred What are you a ****ing moron? ** Yep - Fred is another radio ham. K4DII Frederick M. McKenzie 2867 EPP Bivings Drive Titusville, Fl 32796 ..... Phil Look Phil, I may not agree with avery thing you say, but at least I am supporting you in this debate... And please don't use amateur operators as a signification of stupidity.. You can't fix stupid, It has no classification. Your parents could have prevented stupid. -- You can't fix stupid. You can't even put a band-aid on it, because it's Teflon coated. |
#58
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Two phases or not?
Michael Kennedy wrote: MIke et al The problem seems to be that after all this dialogue, that so many of the responders simply don't stick to the basic premise that different phases by definition have timing differences. Simply reversing the way of using a phase does not make it a different phase. The timing stays the same. Ok I get what your saying.. But do you understand what a phanse difference is?? It is timing like you said.. Here is an explanation using audio waves. Maybe you can get what I am saying. http://www.indiana.edu/~emusic/acoustics/phase.htm By your definiton, a 'Push-Pull Output Transformer' is two phase. -- You can't fix stupid. You can't even put a band-aid on it, because it's Teflon coated. |
#59
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Two phases or not?
On 1/26/2011 7:45 PM Michael A. Terrell spake thus:
Michael Kennedy wrote: MIke et al The problem seems to be that after all this dialogue, that so many of the responders simply don't stick to the basic premise that different phases by definition have timing differences. Simply reversing the way of using a phase does not make it a different phase. The timing stays the same. Ok I get what your saying.. But do you understand what a phanse difference is?? It is timing like you said.. Here is an explanation using audio waves. Maybe you can get what I am saying. http://www.indiana.edu/~emusic/acoustics/phase.htm By your definiton, a 'Push-Pull Output Transformer' is two phase. It IS two phase; that's the whole point. (At least on the primary side.) I'd be interested in your explanation of how it isn't ... (I think my example was a little more clear: look at a center-tapped transformer used as the input to a push-pull stage and tell me there aren't two phases there.) -- Comment on quaint Usenet customs, from Usenet: To me, the *plonk...* reminds me of the old man at the public hearing who stands to make his point, then removes his hearing aid as a sign that he is not going to hear any rebuttals. |
#60
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Two phases or not?
Right.. let us all know when you find that 2-phase appliance/machine motor
for your 2-phase electrical service. Ya Ignorant and apparently illiterate ****.. FOAD -- Cheers, WB .............. "Jamie" t wrote in message ... Wild_Bill wrote: Having a couple of decades experience in servicing/repair of commercial and consumer electronic equipment and additional training and experience in industrial site experience (both electrical and electronic circuits), I have never seen descriptions or designations stated as 2-phase, for any type of transformer. Or: Hey bub, you gotta single-phase-in, 2-phase-out transformer? But I have seen and used transformers with multiple taps, on both pri and sec sides. The number of taps on either side of a single-phase transformer don't change the output(s) to 2-phase, regardless of how many there are (pri or sec side). Monophase sounds odd, like it's not related to electricity. How about uniphase? Yep, found an example (and diphase) used in a book c 1905. Electricity In Every-day Life Edwin J. Houston PhD. You know that's gonna be interesting just because it was authored by a PhD. -- Cheers, WB ............. You still lose: You don't seem to know the difference between circuits and phase angles.. Typical residential hack electrician.. I hope you don't ever decide to move in to electronics, you'd be in a world of ****. |
#61
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Two phases or not?
David Nebenzahl wrote: On 1/26/2011 7:45 PM Michael A. Terrell spake thus: Michael Kennedy wrote: MIke et al The problem seems to be that after all this dialogue, that so many of the responders simply don't stick to the basic premise that different phases by definition have timing differences. Simply reversing the way of using a phase does not make it a different phase. The timing stays the same. Ok I get what your saying.. But do you understand what a phanse difference is?? It is timing like you said.. Here is an explanation using audio waves. Maybe you can get what I am saying. http://www.indiana.edu/~emusic/acoustics/phase.htm By your definiton, a 'Push-Pull Output Transformer' is two phase. It IS two phase; that's the whole point. (At least on the primary side.) Then a Williamson 'Ultra linear' output transformer is four phase? http://www.pmillett.com/file_downloads/stancor_ul_schematics.pdf See page 4 for a sample schmatic. I'd be interested in your explanation of how it isn't ... (I think my example was a little more clear: look at a center-tapped transformer used as the input to a push-pull stage and tell me there aren't two phases there.) Then look at a Williamson 'Ultra linear' output transformer and tell me there are four phases. -- You can't fix stupid. You can't even put a band-aid on it, because it's Teflon coated. |
#62
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Two phases or not?
On Thu, 27 Jan 2011 00:23:25 +0000 (UTC) Meat Plow
wrote in Message id: : On Thu, 27 Jan 2011 11:19:54 +1100, Phil Allison wrote: "Fred McKenzie" "Phil Allison" Sine waves of the exact same frequency and amplitude can ONLY differ only in phase. A 180 degree phase difference is as good as any other. I have a flashlight powered by a two-phase system - two D cells. ** Nuh - that is DC, you pathetic troll. It certainly fits your criteria. ** Nuh - not one of them. Its power system can also be considered AC, since DC is just AC with frequency equal to zero. ** Just like white is the same as black with no lights on. Facts are no deterrent to a persistent troll! ** Just like reality is no deterrent to a lunatic. Did someone leave the door open at the asylum today ?? I'd make a comment here but it is against my new year's resolution. My New Year's resolution was an easy one this year. Make no New Year's resolutions ever again. |
#63
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Two phases or not?
JW wrote: On Thu, 27 Jan 2011 00:23:25 +0000 (UTC) Meat Plow wrote in Message id: : On Thu, 27 Jan 2011 11:19:54 +1100, Phil Allison wrote: "Fred McKenzie" "Phil Allison" Sine waves of the exact same frequency and amplitude can ONLY differ only in phase. A 180 degree phase difference is as good as any other. I have a flashlight powered by a two-phase system - two D cells. ** Nuh - that is DC, you pathetic troll. It certainly fits your criteria. ** Nuh - not one of them. Its power system can also be considered AC, since DC is just AC with frequency equal to zero. ** Just like white is the same as black with no lights on. Facts are no deterrent to a persistent troll! ** Just like reality is no deterrent to a lunatic. Did someone leave the door open at the asylum today ?? I'd make a comment here but it is against my new year's resolution. My New Year's resolution was an easy one this year. Make no New Year's resolutions ever again. I made that one, over 30 years ago. -- You can't fix stupid. You can't even put a band-aid on it, because it's Teflon coated. |
#64
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Two phases or not?
I didn't check the link.. the thread topic was electrical power.
I assume some of the ****wits in this thread would like to argue that the outputs of a simple stereo amp (L+/gnd and R+/gnd), with a center channel (L+ and R+) would be 3-phase. Still.. it's not electrical power. A Simple, Practical and Sensible approach to the difference between electrical circuits, and electronic circuits is: Electrical power circuits perform work (mechanical energy, heat etc). Electronic circuits are for relaying information (data, sensing, control of electrical devices, communications). I'm done here.. another wasted minute of my remaining time isn't worthwhile to me. Have yer fun. As I suggested in my first reply in this thread, this issue is simply food (a drug?) for the dimwitted that have nothing better to do. I can only imagine the good efforts that could have been attributed to real issues worldwide.. with the time/effort that's been wasted by trillions of minutes of worthless usenet replies and ****ing contests. -- Cheers, WB .............. "Michael Kennedy" mike@com wrote in message ... MIke et al The problem seems to be that after all this dialogue, that so many of the responders simply don't stick to the basic premise that different phases by definition have timing differences. Simply reversing the way of using a phase does not make it a different phase. The timing stays the same. Ok I get what your saying.. But do you understand what a phanse difference is?? It is timing like you said.. Here is an explanation using audio waves. Maybe you can get what I am saying. http://www.indiana.edu/~emusic/acoustics/phase.htm |
#65
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Two phases or not?
Ok I get what your saying.. But do you understand what a *phanse difference is?? It is timing like you said. Mike Nice weblink. Someone went to a lot of work to do the programming and all for it. When I had phase and rotation and the resultants presented to me a long time ago it was on a blackboard by a math person. Took a while to sink in with all of us in the class. I do undrstand what a phase difference is. I have been tripped up lots of times by it. One time that comes to my mind was when I was working in a 3 phase box and simply couldn't get a there phase subpanel to give me three hot legs as I expected. I found out that a major airport used nothing but 3 phase panels for distribution but only distributed two phases of the three. They used the vacant pole in the panel for growth. There was even a mix of 110 and 220 volts. Thus the panel had one phase on the first pole and the other poles were the same phase. Cost the US government a few thousand which was recovered from the municipality with penalties. And to "add" to this discussion I am filtering the responses by my personal criteria. There are 3 ways of doing anything. The adult way, the child way and the infant way. Take a look at some of the responses. Civil and not so civil. Our leaders thrust on "civility" is long over due. Bob AZ |
#66
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Two phases or not?
On 1/27/2011 12:29 AM Michael A. Terrell spake thus:
David Nebenzahl wrote: On 1/26/2011 7:45 PM Michael A. Terrell spake thus: Michael Kennedy wrote: MIke et al The problem seems to be that after all this dialogue, that so many of the responders simply don't stick to the basic premise that different phases by definition have timing differences. Simply reversing the way of using a phase does not make it a different phase. The timing stays the same. Ok I get what your saying.. But do you understand what a phanse difference is?? It is timing like you said.. Here is an explanation using audio waves. Maybe you can get what I am saying. http://www.indiana.edu/~emusic/acoustics/phase.htm By your definiton, a 'Push-Pull Output Transformer' is two phase. It IS two phase; that's the whole point. (At least on the primary side.) Then a Williamson 'Ultra linear' output transformer is four phase? http://www.pmillett.com/file_downloads/stancor_ul_schematics.pdf See page 4 for a sample schmatic. I looked at your Stancor PDF. Why in the world would you think I'd think that transformer is 4-phase??? [btw, the schematics are on pages 2 and 6] OK, I'll play along here. On page 6 they show an output xfmr with 2 taps. But of course that has nothing whatever to do with phase, as you damn well know, because the output is referenced to one of the OUTER LEGS OF THE TRANSFORMER (see that "COM" on the bottom?), so the output is simply one phase. I was talking about a center-tapped transformer where the two sides are referenced to THE CENTER TAP. So again, how does a center-tapped transformer secondary WHERE THE OUTPUT IS REFERENCED TO THE CENTER TAP (i.e., the center tap is grounded) NOT generate two separate phases? Please 'splain that. -- Comment on quaint Usenet customs, from Usenet: To me, the *plonk...* reminds me of the old man at the public hearing who stands to make his point, then removes his hearing aid as a sign that he is not going to hear any rebuttals. |
#67
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Two phases or not?
How does a center-tapped transformer secondary WHERE
THE OUTPUT IS REFERENCED TO THE CENTER TAP (ie, the center tap is grounded) NOT generate two separate phases? After thinking about this, I've come to the conclusion that it doesn't. "Phase" implies a relative-timing relationship. Simply inverting polarity doesn't change the timing between the two waveforms. |
#68
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Two phases or not?
William Sommerwerck wrote:
How does a center-tapped transformer secondary WHERE THE OUTPUT IS REFERENCED TO THE CENTER TAP (ie, the center tap is grounded) NOT generate two separate phases? After thinking about this, I've come to the conclusion that it doesn't. "Phase" implies a relative-timing relationship. Simply inverting polarity doesn't change the timing between the two waveforms. If you compare the timing of the positive part of the sine wave you will see that the two signals have different timing. Bill K7NOM |
#69
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Two phases or not?
"Bill K7NOM" wrote in message
... William Sommerwerck wrote: How does a center-tapped transformer secondary WHERE THE OUTPUT IS REFERENCED TO THE CENTER TAP (ie, the center tap is grounded) NOT generate two separate phases? After thinking about this, I've come to the conclusion that it doesn't. "Phase" implies a relative-timing relationship. Simply inverting polarity doesn't change the timing between the two waveforms. If you compare the timing of the positive part of the sine wave you will see that the two signals have different timing. No more than your image in a mirror is a separate being. |
#70
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Two phases or not?
On 1/28/2011 6:38 AM William Sommerwerck spake thus:
How does a center-tapped transformer secondary WHERE THE OUTPUT IS REFERENCED TO THE CENTER TAP (ie, the center tap is grounded) NOT generate two separate phases? After thinking about this, I've come to the conclusion that it doesn't. "Phase" implies a relative-timing relationship. Simply inverting polarity doesn't change the timing between the two waveforms. That can't be correct. Let's test the hypothesis. If we had two signals that were 179° out of phase, would you not say that we had two separate phases? There is a definite, though small, timing difference. Let's say the signals were 181° out of phase: two phases again, correct? So what's "special" or magic about 180° that it wouldn't be considered a completely separate and distinct phase? Why would phase have a "hole" at 180°? (And for any wisenheimers who will say "well, you must consider 0° to be a separate phase too!" I say nonsense: that's just a phase "identity" which we can ignore as being identical to the original phase.) People seem to be tripped up by the fact that it's trivially easy to produce the 180° phase, and that it is, as you say, a mirror image of its respective phase. But this doesn't make it any less of a separate phase. The other fallacy here is that because we don't actually use 2-phase electrical power, there cannot be any such thing as 2-phase power. It is true that two phase power (0° - 180°) is not very useful; that's why we don't have any 2-phase motors. But technically, a system with two legs of 0° and 180° is, in fact, a 2-phase system. Even if it's not called that. Even if it is not used *as a phased system* (it's used to derive two legs from a step-down transformer in a 120-0-120 arrangement). It's still 2-phase power. So whaddya say now? -- Comment on quaint Usenet customs, from Usenet: To me, the *plonk...* reminds me of the old man at the public hearing who stands to make his point, then removes his hearing aid as a sign that he is not going to hear any rebuttals. |
#71
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Two phases or not?
David Nebenzahl wrote:
On 1/28/2011 6:38 AM William Sommerwerck spake thus: How does a center-tapped transformer secondary WHERE THE OUTPUT IS REFERENCED TO THE CENTER TAP (ie, the center tap is grounded) NOT generate two separate phases? After thinking about this, I've come to the conclusion that it doesn't. "Phase" implies a relative-timing relationship. Simply inverting polarity doesn't change the timing between the two waveforms. That can't be correct. Let's test the hypothesis. If we had two signals that were 179° out of phase, would you not say that we had two separate phases? There is a definite, though small, timing difference. Let's say the signals were 181° out of phase: two phases again, correct? So what's "special" or magic about 180° that it wouldn't be considered a completely separate and distinct phase? Why would phase have a "hole" at 180°? (And for any wisenheimers who will say "well, you must consider 0° to be a separate phase too!" I say nonsense: that's just a phase "identity" which we can ignore as being identical to the original phase.) Repeat the hypothesis a 0º and you will find a hole in there, much the same as there must be one at 180º. To understand what is "magical" about that you will need to know phasors and the math related to that. Once you understand the math that support phasors, you clearly see why 0º and 180º are the same phasor. http://en.wikipedia.org/wiki/Phasor People seem to be tripped up by the fact that it's trivially easy to produce the 180° phase, and that it is, as you say, a mirror image of its respective phase. But this doesn't make it any less of a separate phase. The other fallacy here is that because we don't actually use 2-phase electrical power, there cannot be any such thing as 2-phase power. It is true that two phase power (0° - 180°) is not very useful; that's why we don't have any 2-phase motors. But technically, a system with two legs of 0° and 180° is, in fact, a 2-phase system. Even if it's not called that. Even if it is not used *as a phased system* (it's used to derive two legs from a step-down transformer in a 120-0-120 arrangement). It's still 2-phase power. So whaddya say now? No, it isn't. -- Mark Cross If Linux doesn't have the solution, you have the wrong problem. |
#72
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Two phases or not?
On 1/28/2011 11:19 AM David Nebenzahl spake thus:
The other fallacy here is that because we don't actually use 2-phase electrical power, there cannot be any such thing as 2-phase power. It is true that two phase power (0° - 180°) is not very useful; that's why we don't have any 2-phase motors. But technically, a system with two legs of 0° and 180° is, in fact, a 2-phase system. Actually, there is at least one application which depends on there being 2 phases in ordinary residential power distribution panels: the so-called Edison circuit. This is where two circuits are run with separate "hots" and a common neutral, where the neutral conductor is the same size as the hots. The only way this can work is if the two circuits are separate phases (in this case, 180° apart), so that the currents cancel in the common return conductor. Apart from this, we wouldn't care if the two legs of the power company's step-down transformer delivered the same phase of power (just give us the juice! who cares about the phase?). -- Comment on quaint Usenet customs, from Usenet: To me, the *plonk...* reminds me of the old man at the public hearing who stands to make his point, then removes his hearing aid as a sign that he is not going to hear any rebuttals. |
#73
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Two phases or not?
"William Sommerwerck" "Phase" implies a relative-timing relationship. ** The term " phase shift " generally has that implication - but not the term " phase " alone. Simply inverting polarity doesn't change the timing between the two waveforms. ** Irrelevant - see above. In any case, for continuous sinewaves a 180 degree phase shift and signal polarity inversion are completely indistinguishable. ..... Phil |
#74
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Two phases or not?
On 1/28/2011 11:28 AM Mark Cross spake thus:
David Nebenzahl wrote: So what's "special" or magic about 180° that it wouldn't be considered a completely separate and distinct phase? Why would phase have a "hole" at 180°? (And for any wisenheimers who will say "well, you must consider 0° to be a separate phase too!" I say nonsense: that's just a phase "identity" which we can ignore as being identical to the original phase.) Repeat the hypothesis a 0º and you will find a hole in there, much the same as there must be one at 180º. I don't think so. At 0º, the two waveforms are *identical*, so that's the degenerate case. To understand what is "magical" about that you will need to know phasors and the math related to that. Once you understand the math that support phasors, you clearly see why 0º and 180º are the same phasor. http://en.wikipedia.org/wiki/Phasor Sorry, I don't use Wikipedia as a source of credible information. But even if 0º and 180º are the same phasor, they're still completely different waveforms, which is the important thing here, isn't it? -- Comment on quaint Usenet customs, from Usenet: To me, the *plonk...* reminds me of the old man at the public hearing who stands to make his point, then removes his hearing aid as a sign that he is not going to hear any rebuttals. |
#75
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Two phases or not?
David Nebenzahl wrote:
On 1/28/2011 11:28 AM Mark Cross spake thus: David Nebenzahl wrote: So what's "special" or magic about 180° that it wouldn't be considered a completely separate and distinct phase? Why would phase have a "hole" at 180°? (And for any wisenheimers who will say "well, you must consider 0° to be a separate phase too!" I say nonsense: that's just a phase "identity" which we can ignore as being identical to the original phase.) Repeat the hypothesis a 0º and you will find a hole in there, much the same as there must be one at 180º. I don't think so. At 0º, the two waveforms are *identical*, so that's the degenerate case. To understand what is "magical" about that you will need to know phasors and the math related to that. Once you understand the math that support phasors, you clearly see why 0º and 180º are the same phasor. http://en.wikipedia.org/wiki/Phasor Sorry, I don't use Wikipedia as a source of credible information. Open your mind. But even if 0º and 180º are the same phasor, they're still completely different waveforms, which is the important thing here, isn't it? No. -- Mark Cross If Linux doesn't have the solution, you have the wrong problem. |
#76
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Two phases or not?
David Nebenzahl wrote:
On 1/28/2011 11:28 AM Mark Cross spake thus: David Nebenzahl wrote: So what's "special" or magic about 180° that it wouldn't be considered a completely separate and distinct phase? Why would phase have a "hole" at 180°? (And for any wisenheimers who will say "well, you must consider 0° to be a separate phase too!" I say nonsense: that's just a phase "identity" which we can ignore as being identical to the original phase.) So you get 2 phases out of a single phase power transformer? With 2 separate secondary windings there are 2 phases. Winding A is not the same as winding B. With 3 separate secondary windings there are 3 separate phases. Winding A is not the same as winding B. And winding C is not the same as A. And C is not the same as B. With 4 separate secondary windings there are 4 phases. .... Your transformer supplier can furnish a single core transformer with 4 secondary phases? Your transformer supplier can furnish a single-core transformer with 2 secondary phases? To understand what is "magical" about that you will need to know phasors and the math related to that. Once you understand the math that support phasors, you clearly see why 0º and 180º are the same phasor. http://en.wikipedia.org/wiki/Phasor Sorry, I don't use Wikipedia as a source of credible information. Then use your own knowledge of phasors. The representation of a 120/240V service (relative to N) is +120 and -120, both real. There are no imaginary components. Plus and minus relationships. But even if 0º and 180º are the same phasor, they're still completely different waveforms, which is the important thing here, isn't it? Completely different waveforms? Plus sine is a completely different waveform from minus sine. Have you taken trigonometry? On a transformer secondary the relative relationships are locked at plus or minus. 180 degrees is trivial. When you are doing calculations on a simple single-phase resistive system you use phase angles? Most of us use plus and minus signs. With non-resistive elements phasors are used - see above. You can, of course, call it whatever you want to. Just expect communication problems. I remember 2 people here who agree with you. It is not the only 2 people I would want agreeing with me. Maybe you could shop around to a different newsgroup - maybe alt.engineering.electrical? And two-phase does still exist. Some relatively small 3-phase to 3-phase transformers (like 480/277 to 208/120) connect 2 transformers in a Scott (T) connection. The transformers are an intermediate 2-phase. That is, real 2-phase - 90 degrees between the voltages -- bud-- |
#77
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Two phases or not?
bud-- wrote:
David Nebenzahl wrote: On 1/28/2011 11:28 AM Mark Cross spake thus: David Nebenzahl wrote: So what's "special" or magic about 180° that it wouldn't be considered a completely separate and distinct phase? Why would phase have a "hole" at 180°? (And for any wisenheimers who will say "well, you must consider 0° to be a separate phase too!" I say nonsense: that's just a phase "identity" which we can ignore as being identical to the original phase.) So you get 2 phases out of a single phase power transformer? With 2 separate secondary windings there are 2 phases. Winding A is not the same as winding B. With 3 separate secondary windings there are 3 separate phases. Winding A is not the same as winding B. And winding C is not the same as A. And C is not the same as B. With 4 separate secondary windings there are 4 phases. .... Your transformer supplier can furnish a single core transformer with 4 secondary phases? Your transformer supplier can furnish a single-core transformer with 2 secondary phases? To understand what is "magical" about that you will need to know phasors and the math related to that. Once you understand the math that support phasors, you clearly see why 0º and 180º are the same phasor. http://en.wikipedia.org/wiki/Phasor Sorry, I don't use Wikipedia as a source of credible information. Then use your own knowledge of phasors. The representation of a 120/240V service (relative to N) is +120 and -120, both real. There are no imaginary components. Plus and minus relationships. But even if 0º and 180º are the same phasor, they're still completely different waveforms, which is the important thing here, isn't it? Completely different waveforms? Plus sine is a completely different waveform from minus sine. Have you taken trigonometry? On a transformer secondary the relative relationships are locked at plus or minus. 180 degrees is trivial. When you are doing calculations on a simple single-phase resistive system you use phase angles? Most of us use plus and minus signs. With non-resistive elements phasors are used - see above. You can, of course, call it whatever you want to. Just expect communication problems. I remember 2 people here who agree with you. It is not the only 2 people I would want agreeing with me. Maybe you could shop around to a different newsgroup - maybe alt.engineering.electrical? And two-phase does still exist. Some relatively small 3-phase to 3-phase transformers (like 480/277 to 208/120) connect 2 transformers in a Scott (T) connection. The transformers are an intermediate 2-phase. That is, real 2-phase - 90 degrees between the voltages Yes, 2 phase of 90 degree's still exist, so why is that ok but 180 degree's isn't? Look at power generators (portables), most of them have 2 circuits from the generator 180 out from each other.. Why is this any different from a generator of 90 degrees out ? You can combine a leg of each output from a those generators also.. It's argument that you won't win from those that truly understand the meaning of phase angle supplies and the number of supply legs. Its clear that the maximum you can obtain is only 2 phase angles from any combination of CT's on a transformer supplied from a single phase leg how ever, the number of circuits from a transformer can be endless but not practical, of course. |
#78
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Two phases or not?
Jamie wrote: bud-- wrote: David Nebenzahl wrote: On 1/28/2011 11:28 AM Mark Cross spake thus: David Nebenzahl wrote: So what's "special" or magic about 180° that it wouldn't be considered a completely separate and distinct phase? Why would phase have a "hole" at 180°? (And for any wisenheimers who will say "well, you must consider 0° to be a separate phase too!" I say nonsense: that's just a phase "identity" which we can ignore as being identical to the original phase.) So you get 2 phases out of a single phase power transformer? With 2 separate secondary windings there are 2 phases. Winding A is not the same as winding B. With 3 separate secondary windings there are 3 separate phases. Winding A is not the same as winding B. And winding C is not the same as A. And C is not the same as B. With 4 separate secondary windings there are 4 phases. .... Your transformer supplier can furnish a single core transformer with 4 secondary phases? Your transformer supplier can furnish a single-core transformer with 2 secondary phases? To understand what is "magical" about that you will need to know phasors and the math related to that. Once you understand the math that support phasors, you clearly see why 0º and 180º are the same phasor. http://en.wikipedia.org/wiki/Phasor Sorry, I don't use Wikipedia as a source of credible information. Then use your own knowledge of phasors. The representation of a 120/240V service (relative to N) is +120 and -120, both real. There are no imaginary components. Plus and minus relationships. But even if 0º and 180º are the same phasor, they're still completely different waveforms, which is the important thing here, isn't it? Completely different waveforms? Plus sine is a completely different waveform from minus sine. Have you taken trigonometry? On a transformer secondary the relative relationships are locked at plus or minus. 180 degrees is trivial. When you are doing calculations on a simple single-phase resistive system you use phase angles? Most of us use plus and minus signs. With non-resistive elements phasors are used - see above. You can, of course, call it whatever you want to. Just expect communication problems. I remember 2 people here who agree with you. It is not the only 2 people I would want agreeing with me. Maybe you could shop around to a different newsgroup - maybe alt.engineering.electrical? And two-phase does still exist. Some relatively small 3-phase to 3-phase transformers (like 480/277 to 208/120) connect 2 transformers in a Scott (T) connection. The transformers are an intermediate 2-phase. That is, real 2-phase - 90 degrees between the voltages Yes, 2 phase of 90 degree's still exist, so why is that ok but 180 degree's isn't? Look at power generators (portables), most of them have 2 circuits from the generator 180 out from each other.. Why is this any different from a generator of 90 degrees out ? You can combine a leg of each output from a those generators also.. It's argument that you won't win from those that truly understand the meaning of phase angle supplies and the number of supply legs. Its clear that the maximum you can obtain is only 2 phase angles from any combination of CT's on a transformer supplied from a single phase leg how ever, the number of circuits from a transformer can be endless but not practical, of course. This, from an illiterate ham radio junkie? -- You can't fix stupid. You can't even put a band-aid on it, because it's Teflon coated. |
#79
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Two phases or not?
Jamie wrote:
Yes, 2 phase of 90 degree's still exist, so why is that ok but 180 degree's isn't? Because the decomposition of two 90º phasor contains an imaginary part. Without a real part AND an imaginary part, no distinct phases could be constructed or generated. There is no imaginary part in the decomposition of two 180º apart vectors, and, therefore there is no way to construct other phases (phasors). Sorry, you need to know phasors to understand this principle. -- Mark Cross If Linux doesn't have the solution, you have the wrong problem. |
#80
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Two phases or not?
Jamie wrote: Mark Cross wrote: Jamie wrote: Yes, 2 phase of 90 degree's still exist, so why is that ok but 180 degree's isn't? Because the decomposition of two 90º phasor contains an imaginary part. Without a real part AND an imaginary part, no distinct phases could be constructed or generated. There is no imaginary part in the decomposition of two 180º apart vectors, and, therefore there is no way to construct other phases (phasors). Sorry, you need to know phasors to understand this principle. This must be what separates the Electronic and the Fuse puller EE. I once thought to be an Electrical Engineer or hold an E1 meant, that you had to know a lot about electricity, evidently you don't. Might be a good reason why we find it hard to hire some one for a basic electrical maintenance job that actual understands electrical theory, not many here. Actually, you can't find enough idiots willing to kiss your stupid ass. -- You can't fix stupid. You can't even put a band-aid on it, because it's Teflon coated. |
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