frequency clock
frequency clock
(OP)
Hi guys,
in power plant where the have the frequency clock it displays the frequency, standard time ,time difference and frequency time ,i know the frequency and standard time but what is the frequency time.
in power plant where the have the frequency clock it displays the frequency, standard time ,time difference and frequency time ,i know the frequency and standard time but what is the frequency time.





RE: frequency clock
frequency time would be standard time minus time difference.
If the load had been heavy that day, and thus frequecy was slightly slow, a clock driven by actual frequency would be behind an absolute standard time clock
RE: frequency clock
http://www.telechron.com/telechron/telechron_prese...
RE: frequency clock
The utility that I work for is isolated from the North American grid, and as such we are responsible for regulating the system frequency in our region. In our control centre, we have a display showing system frequency, "system" time (derived from system frequency) and GPS time (derived from a GPS signal, and presumably accurate), along with the difference between the two. Our operators regulate the system frequency so that it stays within reasonable limits, but they will run it slightly above 60 Hz if the system time is falling behind the GPS time, and slightly below 60 Hz if it is getting ahead.
In two of the regions that we sometimes island, we have duplicates of this clock so that the local operator can regulate the system frequency while not connected to the larger grid. In a third region, one of the local operators keeps a battery-powered clock that he uses when disconnected from the larger grid (accuracy isn't great :P).
A couple of years ago, the control centre clock developed a slight error, and over a weekend we "lost" about 10-15 minutes - oops!
RE: frequency clock
RE: frequency clock