line resistance
line resistance
(OP)
In a typical EHT transmission line, having similar conductor size (say Kundah conductor for 230KV), from the actual measured value for different kms, the calculated resistance and reactance per km are not similar. Why? The method of measurement of the line is not known.






RE: line resistance
RE: line resistance
Also, test methods and conditions at the time of test are important. Getting the voltage probes in the right places can make a big difference! And "finger trouble" is all too frequent - wrong connections, misread scales, transcription errors. Also make reasonable allowance for instrument error, accuracy, precision, repeatability etc. YOu won't get meaningful 4 decimal place results if one of your measurements is only accurate to 1 significant digit!
I always try to get our commisssioning people to measure line impedances at commissioning time, and the results are always different from the model. When they are a lot different, I assume human error and try to rectify the problem.
Bung
RE: line resistance
Julian