In message [EMAIL PROTECTED], Chuck Harris writes:
Uhm, sorry, that is just plain wrong. The Ferrantis (sp?) power
meter which is the most widely used meter in the world is not
frequency sensitive within a band of +/- 10% or more.
I have never seen a power meter made by Ferranti in the US.
At 10:00 AM 8/22/2005, you wrote:
Poul-Henning Kamp wrote:
In message [EMAIL PROTECTED],
Bill Hawkins writes
:
Power companies bill on time-integrated power - watt-hour
meters in the US. Watt-hour meters are still mostly driven
by electric clocks, in a way. The frequency does matter.
Uhm,
John Day wrote:
I have never seen a power meter made by Ferranti in the US.
Try Siemens or ABB then, Ferranti has been taken over if I recall.
The term is actually Ferraris, after Galileo Ferraris, the inventer of
the AC induction motor. As far as I can tell, he had nothing to do with
Poul-Henning Kamp wrote, quoting me,
Power companies bill on time-integrated power - watt-hour
meters in the US. Watt-hour meters are still mostly driven
by electric clocks, in a way. The frequency does matter.
Uhm, sorry, that is just plain wrong. The Ferrantis (sp?) power
meter which is the
In message [EMAIL PROTECTED], Bill Hawkins writes
:
1. It is unlikely that any power network just lets itself go,
with no standard time/frequency to hold. The under-frequency
relays would make that hazardous.
Does not follow.
Well, it doesn't follow from the watt-hour meter, but look at
the
Here's the story on frequency regulation of power lines:
You can control a few synchronized generators to an external
time standard. You will not be able to get phase control
unless the electric loads are steady. Think of the load
variations as you would temperature variations, except the
load
