Author :
Kim, S.D. ; Morcos, M.M.
Author_Institution :
Hanbat Nat. Univ., Taijon, South Korea
Abstract :
This paper describes several properties and nondestructive techniques for evaluating the extent of deterioration of aluminum stranded conductors steel reinforced (ACSR) conductors due to forest fires in overhead transmission lines. A solenoid coil changes its impedance with changes in the electromagnetic properties and structure of test conductors. Therefore, it is possible to design a nondestructive test (NDT) instrument to evaluate the deterioration. Tension load, extension rate and sensor impedance are tested for some ACSR conductors degraded by an artificial fire. As the duration of the fire is increased, the mechanical strength of the conductors would be reduced, but the extension rate is increased. Furthermore, the sensor output shows the change in mechanical properties. As a result, the solenoid coil provides information to evaluate serious deterioration due to forest fires in ACSR conductors.
Keywords :
fires; inspection; maintenance engineering; nondestructive testing; overhead line conductors; power overhead lines; solenoids; ACSR conductor deterioration inspection; EM structure; aluminum stranded conductors steel reinforced conductors; electromagnetic properties; extension rate; forest fires; mechanical strength; nondestructive techniques; nondestructive test; overhead transmission lines; sensor impedance; solenoid sensor; tension load; Aluminum; Coils; Conductors; Fires; Impedance; Mechanical sensors; Power transmission lines; Solenoids; Steel; Testing;
Journal_Title :
Power Engineering Review, IEEE
DOI :
10.1109/MPER.2001.1184183
