Method and equipment for correcting oil paper insulation frequency domain dielectric spectrum curve at time-varying temperature

Abstract

The invention provides an oil-paper insulation frequency domain dielectric spectrum curve correction method and equipment at a time-varying temperature, and the method comprises the steps: constructing a two-dimensional axial symmetry model for testing an oil-paper insulation sleeve, and determining temperature distribution nephograms corresponding to the two-dimensional axial symmetry model according to the two-dimensional axial symmetry model; wherein the temperature distribution cloud picture is a heat dissipation three-dimensional temperature distribution cloud picture of the two-dimensional axisymmetric model at different moments. And determining a first function corresponding to the two-dimensional axisymmetric model according to the temperature distribution nephograms at different moments. And determining a second function according to the dielectric relaxation model and a plurality of preset constant temperature frequency domain dielectric spectrum FDS curves. And according to the first function and the second function, determining the equivalent temperature corresponding to each frequency point of the to-be-corrected FDS curve through a least square method. Wherein the to-be-corrected FDS curve is obtained by acquiring and testing the oil paper insulating sleeve by an FDS tester. And correcting the to-be-corrected FDS curve according to each equivalent temperature and a preset mode.

Description

technical field [0001] The present application relates to the technical field of oil-paper insulation, and in particular, to a method and device for calibrating the frequency-domain dielectric spectrum curve of oil-paper insulation under time-varying temperature. Background technique [0002] The construction of cross-regional power grids has gradually become a necessary means of optimizing resource allocation, among which refined management of the life cycle of power equipment is the key to building a safe and efficient smart grid. As one of the most important equipment in the power system, the capacitor-type high-voltage bushing is called the "throat" of the power system, and its remaining life mainly depends on the internal oil-paper insulation state. [0003] Under the action of various stresses, the oil-paper insulation will gradually age and become damp. At present, those skilled in the art mainly use the recovery voltage method, the polarization / depolarization current...

AI Technical Summary

Problems solved by technology

However, in the actual use process, affected by external factors such as region and climate, the equipment may be in a dynamic cooling process, and the equipment temperature is a time-varying temperature. In this case, the FDS curve obtained is affected by the temperature, which makes it impossible to accurately evaluate the oil paper. Insulation state

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