Experimental verification of a real-time program for the determination of temperature and sag of overhead lines
An outdoor test facility was used to experimentally verify real-time overhead conductor ampacity and sag programs. The facility consists of a 213m span of 26/7 336 kcmil ACSR conductor completely instrumented with 13 thermocouples as well as a sag and tension device. A weather station mounted near mid-span monitors all pertinent weather conditions. The measured conductor temperatures fluctuated significantly along the length of the test span. Spanwise variations in the measured instantaneous temperatures were frequently in excess of 10/sup 0/C for a wide variety of conductor currents and weather conditions. The conductor temperatures predicted by the real-time ampacity program were within 10/sup 0/C of the average measured conductor temperatures for all tests. Measured conductor sags were within 5 percent of values predicted by a real-time sag program. The results of the experimental project show that accurate predictions of real-time conductor temperatures and sags can be achieved by knowing the conductor current, wind speed, wind direction and the ambient air temperature. Therefore, computer programs are capable of predicting conductor temperatures and sags with a minimum amount of weather data provided by a simple and inexpensive weather station. Instrumentation placed on the conductor is not necessary for execution of the ampacity and sag programs.
- Research Organization:
- Research and Test Lab., Georgia Power Company
- OSTI ID:
- 5446981
- Journal Information:
- IEEE Trans. Power Appar. Syst.; (United States), Vol. 102:7
- Country of Publication:
- United States
- Language:
- English
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