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
