Oil immersion transformer temperature calculating method and temperature control device

Abstract

An oil immersion transformer temperature calculating method and a temperature control device are provided; the method comprises the following steps: determining an output current Ip at a rated load and a corresponding heating current Is of the rated load according to transformer performance parameters; determining a heating current i s under the corresponding load according to a pickup transformerCT current I, the output current Ip of the rate load, and the corresponding heating current Is under the rated load; determining a to-be-compensated temperature [delta]T under the corresponding loadaccording to the heating current i s under the corresponding load; using an acquisition module (1) to acquire a CT current I signal of the transformer; using a control module (2) to convert the collected signal into a compensation temperature [delta]T signal; using a power supply module (4) to power up the acquisition module (1) and the control module (2); a mechanical type temperature control meter is not needed for measuring temperature according to the principle that an object expends with heat and contracts with cold, thus improving the oil immersion transformer temperature measuring precision.

Description

1. Technical field [0001] The invention relates to a temperature calculation method and a temperature control device, in particular to a temperature calculation method and a temperature control device for an oil-immersed transformer. 2. Background technology [0002] As an important technical index of the transformer, temperature plays a vital role in the safe operation of the transformer and its service life. Therefore, the temperature calculation method and temperature control device for oil-immersed transformers are important transformer components. In some temperature calculation methods and temperature control devices used in oil-immersed transformers, the existing large-scale oil-immersed transformer temperature measurement devices mainly use mechanical temperature control meters, which use the principle of thermal expansion and contraction of objects, and the temperature set The loss in the process and signal transmission process is large, the response speed is slow a...

AI Technical Summary

Problems solved by technology

[0002] As an important technical index of the transformer, temperature plays a vital role in the safe operation of the transformer and its service life. Therefore, the temperature calculation method and temperature control device for oil-immersed transformers are important transformer components. In some temperature calculation methods and temperature control devices used in oil-immersed transformers, the existing large-scale oil-immersed transformer temperature measurement devices mainly use mechanical temperature control meters, which use the principle of thermal expansion and contraction of objects, and the temperature set The loss of the process and signal transmission process is large, the response speed is slow and the accuracy is low, which affects the measurement accuracy of the temperature of the oil-immersed transformer

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