| Title |
An Experimental Study on a Solenoid Eddy Current Sensor to Inspect Deteriorations in Overhead Distribution Lines |
| Abstract |
This paper deals with an experimental study of a nondestructive testing system using a solenoid eddy current sensor to inspect deteriorations in overhead distribution lines, such as broken wires, severe local corrosion or zinc loss. Corrosion mechanism for ACSR and ACSR-OC is discussed and characteristics for a solenoid sensor to inspect the geometrical parameters of the coil and testing materials impedance are briefly analyzed. A measurement system having a constant current source, a signal processing unit and a motor driver is implemented. This instrument has such capabilities as detecting the sensor output and estimating dimensions of the testing conductors, continuously. As a result, it was shown that the eddy current sensor with an encircling coil could effectively estimate the diameter change due to deteriorations in overhead distribution lines. |