On 7/8/19 8:33 PM, Hal Murray wrote:
jim...@earthlink.net said:
Free space propgation delay for 5500 m is 18.5 milliseconds - compared to
16.67 millisecond period of 60Hz. A velocity factor of about 90%
Neat. Thanks.
What's going on? I'm used to calculating the velocity from the
Um, you're quite right that DC lines have no phase angle - unless you call a
polarity reversal a 180 degree shift.
I was referring to the phase angle of the AC side of an inverter with respect
to the average phase angle of the grid that it is connected to.
It behaves just like a synchronous
On 7/8/19 7:05 PM, Dana Whitlow wrote:
I'm surprised that the VF of HV transmission lines is noticeably less than
unity, given
that the dielectric is just air. Or does the distributed resistance do all
the damage?
It's all about L and C that creates the delay - propagation constant is
I'm surprised that the VF of HV transmission lines is noticeably less than
unity, given
that the dielectric is just air. Or does the distributed resistance do all
the damage?
Dana
On Mon, Jul 8, 2019 at 8:00 PM jimlux wrote:
> On 7/8/19 3:11 PM, Hal Murray wrote:
> >
> >
On 7/8/19 3:11 PM, Hal Murray wrote:
glenl...@pacificmedia.com.au said:
I think people getting confused with the phase of measured current to the
voltage .
No, we have been discussion the phase angle between 2 geographically separated
locations connected by a power line.
Consider the
glenl...@pacificmedia.com.au said:
> I think people getting confused with the phase of measured current to the
> voltage .
No, we have been discussion the phase angle between 2 geographically separated
locations connected by a power line.
Consider the simple case of a generator, 100 miles
with regard to phase angle and confusion over load and power flow ...
I think people getting confused with the phase of measured current to
the voltage .
the voltage phase is fixed, and should be consistent . when you measure
the current phase, relatve to the voltage, that tells you about
Andy, it appears to me that the FNET/GridEye system already does what you
propose:
http://fnetpublic.utk.edu
The Angle Contour Map displays the kind of results you desire. But it doesn't
know the Western Interconnection at this time. I believe there is a typo at the
top of the Angle Contour
rom: time-nuts on behalf of Dave
ZL3FJ<2c...@silverbears.nz>
Sent: Sunday, July 7, 2019 9:23 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] A Research Proposal
I have here a pair of instruments that were part of a system used at one time
in a power sta
The message that the TrueTime/Symmetricom FTM-III power line monitor card for
the XL/XLi receivers contains:
A time error (number of accumulated seconds of error based upon the line
frequency)
The current frequency error from nominal 50/60 Hz
The current measured line frequency (0.001 Hz
Backus
Bellingham, WA
(Western Interconnection)
From: time-nuts on behalf of Dave ZL3FJ
<2c...@silverbears.nz>
Sent: Sunday, July 7, 2019 9:23 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] A Research Proposal
I hav
08, 2019 06:48
To: Bob via time-nuts
Subject: Re: [time-nuts] A Research Proposal
Group,
We've discussed this before, but maybe it needs to be said again.
Line frequency is not constant. There is no master PLL. Approximate
frequency is maintained by a central power dispatching office in each
Since the direction of power flow depends on the phase angle between the
synchronous source and load, it seems to me that the difference between the
average phase angle in one region and that in another (at the ends of a DC
transmission line) will tell you which way power is flowing. I didn't
In Australia, we have a national grid. It's big.
National meaning all but a few isolated towns like Darwin, Perth. Perth
might be connected via a 1800 km HVDC line in the future... which is a
different story DC interconnectors
So, I gather someone with their MASER in Adelaide
Hi
The whole “phase here vs phase there” thing was at the heart of the papers the
power guys started presenting back in the late 1980’s …. At least back then the
data
was between points a lot further spread out than both sides of a valley.
Bob
> On Jul 7, 2019, at 5:39 PM, jimlux wrote:
>
>
On 7/7/19 11:48 AM, Bill Hawkins wrote:
Group,
We've discussed this before, but maybe it needs to be said again.
Line frequency is not constant.
I think the research is more about understanding the frequency and time
shifts across the network, referred to a more accurate and stable
> So no, you can't compare data from different regions, unless you want to know
> which way DC power is flowing.
How does knowing data about two regions tell me anything about how much power
is flowing and which direction?
--
These are my opinions. I hate spam.
Group,
We've discussed this before, but maybe it needs to be said again.
Line frequency is not constant. There is no master PLL. Approximate
frequency is maintained by a central power dispatching office in each of the
four (?) regions tied together by their power distribution grid. The
Historically, and even today, the steady frequency of AC power has been used
for timekeeping. So there may be interest here in the following research
proposal:
Within a given power distribution grid, several observers as widely separated
geographically as possible, time stamp the first two
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