| Title |
Development of Deterioration Diagnosis System for Aged ACSR-OC Conductors in HV Overhead Distribution Lines |
| Authors |
Sung-Duck Kim ; Seung-Ho Lee |
| Abstract |
Design and experiments of a nondestructive testing system with a solenoid eddy current sensor to inspect deterioration of ACSR-OC (ACSR Outdoor Cross-linked Polyethylene Insulated Wires) usually used in HV overhead distribution lines in domestic areas is presented in this paper. Through corrosion mechanisms and deterioration results for ACSR-OC conductors are examined, it is shown that corrosion may lead to the reduction of the effective cross section area of conductors. A useful electromagnetic method to detect and quantify severe corrosion degree of aged conductors is proposed. The measurement system consisting of a constant current source with a RF frequency, a signal processing unit and a motor driver/ controller is designed and implemented. This instrument has such capabilities as detecting the sensor output and estimating diameter change of the testing conductors, continuously. As a result, it was verified that such corrosion detector system with an eddy current sensor can be shown good effectiveness for estimating the serious faults due to deterioration in overhead distribution lines and giving an early warning before severe aged conductor may lead to fail. |