Ultrasonic phased array detection of internal deffects in composite insulators
Artikel i vetenskaplig tidskrift, 2016

To reduce the risk imposed by use of defected composite insulators on the operation of power grids, this paper introduces a nondestructive ultrasonic phased array (UPA) technique that allows effectively test such insulators. The method offers a great potential by reducing inspection time as well as allowing for analyzing components characterized by a complex geometry. The UPA inspection system utilizes an open-ended rectangular waveguide sensor, operating at frequency of 2.5 MHz. The system is simple, safe and relatively inexpensive. In this work, samples of silicone rubber composite insulators with various types of detects are studied and the obtained results show that void defects in the bulk of the insulator housing are easiest to be detected. Holes under insulator sheds can also be detected by the edge of scanning range. For the defects near the core-shed interface, the detection becomes possible by comparisons with sample without defects.

composite insulator.

Ultrasonic phased array

internal defects

nondestructive testing


Chao Yuan

South China University of Technology

congzhen xie

South China University of Technology

licheng li

South China University of Technology

Fuzeng Zhang

China Southern Power Grid

Stanislaw Gubanski

Chalmers, Material- och tillverkningsteknik, Högspänningsteknik

IEEE Transactions on Dielectrics and Electrical Insulation

1070-9878 (ISSN) 15584135 (eISSN)

Vol. 23 1 525-531 7422600





Elektroteknik och elektronik



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