Transmission line voltage estimation Rule of Thumb
Transmission line voltage estimation Rule of Thumb
(OP)
Is ther a reliable method of estimating the voltage on transmission line by direct observation?
I had heard something about the number of grooves of an insulator, with each groove equivelant to so many kV....
I had heard something about the number of grooves of an insulator, with each groove equivelant to so many kV....






RE: Transmission line voltage estimation Rule of Thumb
I don't know about grooves in an insulator, but counting the number of bells used can give some estimation, but there are many variables that would determine the number of bells used in a given area. In areas with little air borne contamination you can get away with fewer bells than in an area with much air borne contamination; coastal areas always require more bells than clean inland areas.
For one class on line construction, for one type of insulator bell, in one location, I've worked out that it must be about 1 bell per 25kV plus 1 bell. The best approach would be to know the voltage of some lines in your area and work out a similar formula.
RE: Transmission line voltage estimation Rule of Thumb
RE: Transmission line voltage estimation Rule of Thumb
It is harder than you can imagine, every area has thier own voltages and design requirements, I got pretty good at Detroit Edison, Consumers power, 1st energy, NSP, and reliants systems.
I like the 25kV/Bell +1 bell idea, I will give that a try.
I also have made some interesting observations on birds on powerlines, but dont get me started on that.
Here is a good song to listen too while you are drivin the lines.
RE: Transmission line voltage estimation Rule of Thumb
Empirically derived equation (curve fit)where:
kV is voltage (line to line)
N is number of insulators
kV=(0.0248*N^2)+(17.859*N)-18.316
For what its worth this equation holds true most of the time--as others have mentioned there are other factors that might cause it to vary. It WILL get you close...
RE: Transmission line voltage estimation Rule of Thumb
RE: Transmission line voltage estimation Rule of Thumb
RE: Transmission line voltage estimation Rule of Thumb
Great tune, ‘zog. [Maybe a verse on overtime to pay for the new boat?]
RE: Transmission line voltage estimation Rule of Thumb
RE: Transmission line voltage estimation Rule of Thumb
old field guy
RE: Transmission line voltage estimation Rule of Thumb
RE: Transmission line voltage estimation Rule of Thumb
old field guy
RE: Transmission line voltage estimation Rule of Thumb
RE: Transmission line voltage estimation Rule of Thumb
RE: Transmission line voltage estimation Rule of Thumb
JIM