May I ask a question about the single vs two phase stuff

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LarryFine

LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
jumper said:
The-Trainwreck-A-Real-Train-Wreck.jpg
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I told you not to put that penny on the track!
 
R

RumRunner

Senior Member
Location
SCV Ca, USA
Occupation
Retired EE
Besoeker said:
I quite agree. I have given quite a few training courses over the years. Mostly it was for maintenance electricians in plants that had our kit. The spectrum of knowledge made it difficult to tailor the content of the courses to suit all. For some it was clearly just an opportunity to skive off work.

A little background if I may. Mods be patient.
I've been retired a few years now. The division of Eaton that I ran was a specialised niche. Not long after I left, the guy who was my chief engineer also departed. That left a vacuum in the knowledge of systems we supplied. Customers voted with their feet and another company got the support business.Earlier this year, I was invited to give them a training course. These were qualified guys with knowledge and experience in the drives field. It was much more rewarding teaching them.
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Sounds like someone who had been a member of an organization that suffered from the devastating effect of Parkinson's Law.

This is a law articulated by Cyril Parkinson, an economist, describing a mathematical equation about bureaucracies that evolve in an organization.

In simple terms every worker usually a technical worker or engineer who has the potential of becoming a member of administration is working towards inefficiency. We get promoted to the upper level of management until we reach the point where there is no more room for promotion.

The sad result is: this individual gets canned. :(
 
jumper

jumper

Senior Member
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3 Hr 2 Min from Winged Horses
myspark said:
Sounds like someone who had been a member of an organization that suffered from the devastating effect of Parkinson's Law.

This is a law articulated by Cyril Parkinson, an economist, describing a mathematical equation about bureaucracies that evolve in an organization.

In simple terms every worker usually a technical worker or engineer who has the potential of becoming a member of administration is working towards inefficiency. We get promoted to the upper level of management until we reach the point where there is no more room for promotion.

The sad result is: this individual gets canned. :(
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None of which applies to tranny analysis, sine waves, or various methodologies....
 
I

Ingenieur

Senior Member
Location
Earth
myspark said:
Sounds like someone who had been a member of an organization that suffered from the devastating effect of Parkinson's Law.

This is a law articulated by Cyril Parkinson, an economist, describing a mathematical equation about bureaucracies that evolve in an organization.

In simple terms every worker usually a technical worker or engineer who has the potential of becoming a member of administration is working towards inefficiency. We get promoted to the upper level of management until we reach the point where there is no more room for promotion.

The sad result is: this individual gets canned. :(
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wth :slaphead:
 
W

wwhitney

Senior Member
Location
Berkeley, CA
Occupation
Retired
Ingenieur said:
the slope must be of the same sign
they are not
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Well, that's one choice of the meaning of "in phase". Another choice is not to require that.

The definitions of "phase" and "in phase" obviously should be a consensus choice. But if I were in charge, then in the context of sine waves of a fixed frequency, I would define a phase as a one-dimensional vector space of such functions. That would correspond to the usual usage of single phase, two phase, and three phase systems (with the exception of calling two hots and a neutral from a 3 phase wye system "single phase").

Cheers, Wayne
 
I

Ingenieur

Senior Member
Location
Earth
wwhitney said:
Well, that's one choice of the meaning of "in phase". Another choice is not to require that.

The definitions of "phase" and "in phase" obviously should be a consensus choice. But if I were in charge, then in the context of sine waves of a fixed frequency, I would define a phase as a one-dimensional vector space of such functions. That would correspond to the usual usage of single phase, two phase, and three phase systems (with the exception of calling two hots and a neutral from a 3 phase wye system "single phase").

Cheers, Wayne
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if you don't require that they are out of phase
 
jumper

jumper

Senior Member
Location
3 Hr 2 Min from Winged Horses
wwhitney said:
Well, that's one choice of the meaning of "in phase". Another choice is not to require that.

The definitions of "phase" and "in phase" obviously should be a consensus choice. But if I were in charge, then in the context of sine waves of a fixed frequency, I would define a phase as a one-dimensional vector space of such functions. That would correspond to the usual usage of single phase, two phase, and three phase systems (with the exception of calling two hots and a neutral from a 3 phase wye system "single phase").

Cheers, Wayne
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But two hots and a noodle is “single phase”. My methodology works for both systems...:D

Nice simple math that works for both.

But I am willing to discuss this beyond that level, but I cannot agree to switching forms at a basic applied level for a general sparky.
 
Besoeker

Besoeker

Senior Member
Location
UK
jumper said:
My bad, I have not even tossed that into my point of view yet.

Here is a pic. You see where I will take this?

02171.png


Note all the signs must be taken in context, else it is confusing/wrong.....
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Where does the 120° come from?
 
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