Moisture Content Measurement Method of Transformer Insulation System
A technology of insulation system and measurement method, applied in the direction of material resistance, etc., can solve the problems affecting the reliability of the result judgment, the software technology needs to be improved, the special instrument is complicated and expensive, and achieves the effect of good maintenance, simple instrument and strong pertinence.
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[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments:
[0025] After the insulation system of the transformer to be tested is pressurized by DC for 1 second, the polarization that occurs in the medium is mainly "interface polarization", and other polarizations have been attenuated. The initial value measured by the insulation resistance test mainly characterizes the resistance of the oil layer insulation; the insulation resistance near the stable value mainly characterizes the insulation resistance of the paper layer; the intermediate process depends on the time constant of the oil layer and the paper layer in parallel (interface). Since the insulation resistance is mainly related to the water content of the oil-paper, the water content of the oil-paper insulation can be estimated by measuring the insulation resistance and time curve R(t). Based on this characteristic, the present invention...
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