High overload transformer temperature rise calculation method and apparatus

Abstract

The embodiment of the invention discloses a high overload transformer temperature rise calculation method and apparatus and solves a problem that a traditional mineral oil dipping cable paper low-temperature resistant transformer insulating system temperature rise calculation method is not suitable for a high-temperature oil resistant and high-temperature-resistant paper insulation transformer insulating system. In the prior art, a high overload liquid infiltration distribution transformer temperature rise calculation is yet to come. The method of the embodiment comprises steps of calculating transformer winding coil loss through a numerical value finite element method, calculating heat source loss strength with the transformer winding coil as the heat source according to an effective heat radiating structure surrounding the heat source, acquiring a winding coil temperature gradient calculated curved upon different environment temperature according to transformer temperature measuring values and the heat source loss strength, determining winding temperature rise calculation coefficient, and calculating temperature rise according to the winding coil temperature rise calculation coefficient to achieve a temperature rise result.

Description

technical field [0001] The invention relates to the field of transformer temperature rise calculation, in particular to a method and device for calculating the temperature rise of a high overload transformer. Background technique [0002] At present, liquid-immersed distribution transformers with high overload capacity have begun to be actually used in power systems. Compared with the original ordinary oil-immersed distribution transformer, this type of transformer is characterized by high permissible hot spot temperature, strong overload capacity, and broad-spectrum urban and rural application applicability. However, the liquid-immersed distribution transformer with high overload capacity depends on the progress of materials, and the insulating material and insulating liquid different from the crude oil-immersed distribution transformer are used to ensure that it has better high overload and high temperature resistance. Therefore, this type of transformer is very different...

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Problems solved by technology

[0005] The embodiment of the present invention provides a method and device for calculating the temperature rise of a high-overload transformer, which solves the problem that the traditional method for calculating the temperature rise of the insulation system of a low-temperature-resistant transformer impregnated with mineral oil cable paper is not suitable for high-temperature-resistant oil and high-temperature-resistant paper insulation transformers Insulation system, but there is no calculation method for temperature rise of high overload liquid-immersed distribution transformers in the prior art

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