Abstract
The paper considers technical means of methods for diagnostics of insulation of high-voltage bushing for power transformers. It also points out advantages and disadvantages of existing methods and proposes a new solution for contactless diagnostics on the basis of measurement of electric field parameters near the surface of bushing. For control of technical condition of power transformers bushing the authors have developed a scheme for placement of elements of portable diagnostics device. A defect in the insulator leads to redistribution of electric potentials on capacitive elements of the high-voltage bushing and to change of electric field intensity around the fault bushing. The proposed design allows fast mounting of device on the power transformer body without its shutdown and revealing of fault bushing according to change of field intensity (sensors of electric field are located near bushing). The developed method for diagnostics of condition of power transformers bushing based on analysis of data of electric field distribution allows determining technical condition of bushing in operation conditions.
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