Thermal-electric-mechanical multi-stress ageing test platform of extra-high voltage converter transformer paper oil insulation materials and testing method thereof

Abstract

The present invention discloses a thermal-electric-mechanical multi-stress ageing test platform of extra-high voltage converter transformer paper oil insulation materials and a testing method thereof.The test platform comprises three stress modules; a thermal stress module comprises a heating plate arranged at the outer wall of an ageing test chamber to allow paper oil insulation materials to reach an assigned temperature; an electric stress module is formed by a voltage source and an electrode and is configured to provide a direct current voltage, an alternating current voltage and an alternating current / direct current compound voltage for the paper oil insulation materials, wherein the direct current voltage and the alternating current voltage can reach an assigned voltage level; and amechanical stress module is formed by a vibration table, wherein the vibration table can provide mechanical vibration with assigned frequency and amplitude. When the thermal-electric-mechanical modules work at the same time, the thermal-electric-mechanical modules can provide various stress ageing conditions for the paper oil insulation materials to simulate the complex work conditions of the internal portion of a converter transformer and perform individual regulation of three stresses so as to facilitate analysis and obtain ageing effects of three different stresses for the paper oil insulation materials.

Description

technical field [0001] The invention belongs to the technical field of oil-paper insulation for UHV converter transformers, and in particular relates to a thermo-electric-mechanical multi-stress combined aging experiment platform and an experiment method for UHV converter transformer oil-paper insulation materials. Background technique [0002] As an excellent composite insulating material, oil-paper insulating material has been used as the main insulating material in transformers since the last century because of its excellent insulating properties, low cost, and easy availability in large quantities. Since the service life of some transformers is gradually approaching and exceeding its design service life, there have been a large number of studies on the thermal aging mechanism, state assessment and life prediction of oil-paper insulation materials in transformers. In the field of HVDC transmission, oil-paper insulation materials are widely used in UHV converter transforme...

AI Technical Summary

Problems solved by technology

At present, the existing aging experiment platforms can only conduct thermal aging or thermoelectric aging experiments on oil-paper insulation materials, and there are few reports on the "thermal-electric-mechanical" joint aging experiments on oil-paper insulation materials.

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