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Non-intrusive winding temperature measurement method for oil-immersed air-cooled pie winding transformer

A cake-type winding and oil-immersed air-cooled technology, which is applied in the field of transformers, can solve problems affecting transformer insulation, sealing performance, complex structure, and ordinary thermometer measurement, and achieve timely and reliable over-temperature alarm and trip signals, and accurate measurement.

Active Publication Date: 2018-12-18
ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the oil-immersed air-cooled cake-type winding transformer winding is wrapped in an oil-paper insulation system, its temperature is difficult to measure with an ordinary thermometer
At present, there are two commonly used temperature measuring devices for transformer windings. One is to directly measure the temperature of the winding parts with a built-in fiber grating and other temperature measuring devices in the transformer. This method is accurate, but the structure is complicated, which affects the insulation and sealing performance of the transformer; The other is to indirectly measure the winding temperature through the "thermal simulation" method, and calculate the temperature of the winding part by measuring the surface oil temperature of the transformer and the winding current. This method is easy to implement, but because only the influence of the winding current is considered, the measurement error is large. Big

Method used

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  • Non-intrusive winding temperature measurement method for oil-immersed air-cooled pie winding transformer

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Embodiment Construction

[0048] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0049] A non-invasive winding temperature measurement method for oil-immersed air-cooled cake winding transformers, which is figure 1It is realized on the winding temperature measurement system shown in the figure. On the oil-immersed air-cooled pancake winding transformer, there are transformer riser 3, transformer bushing 1, terminal box 9, air-cooled control box 8, heat sink 6, fan 7, Thermometer oil cup5. The terminal box and the air-cooled control box are installed on the side wall of the transformer. An oil-immersed air-cooled transformer cake winding temperature controller and an ambient thermometer are installed in the terminal box. A meter 10 is installed on the surface of the terminal box. An air-cooled controller is installed in the cold control box. The thermometer oil cup is installed on the top cover of the transformer and an oil su...

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Abstract

The invention relates to a non-intrusive winding temperature measurement method for an oil-immersed air-cooled pie winding transformer. The method comprises the following steps: connecting an oil-immersed air-cooled transformer pie winding temperature measurement and control instrument with an oil level thermometer, a current transformer, an environmental thermometer, and an air-cooled controllerinstalled on the oil-immersed air-cooled pie winding transformer together, collecting corresponding data in real time, and synchronously inputting transformer structural parameters, winding types, andstructure size parameters; establishing a heat balance equation between an oil-immersed air-cooled pie winding transformer winding and transformer oil; and calculating the winding temperature of theoil-immersed air-cooled pie winding transformer. According to the non-intrusive winding temperature measurement method for the oil-immersed air-cooled pie winding transformer provided by the invention, for the characteristics of the oil-immersed air-cooled pie winding transformer, various influencing factors such as the surface oil temperature of the transformer, the winding current and the transformer structural form, the structure and size of a pie winding, the cooling mode and the operation of a cooling fan, etc. are fully considered, so that the measurement of the winding temperature undervarious working conditions of the transformer is more accurate, and the transformer operation and maintenance personnel can master the running state of the transformer in time.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to a non-invasive winding temperature measuring method of an oil-immersed air-cooled pie-type winding transformer. Background technique [0002] The operating temperature of the transformer plays an important role in judging the operating state of the transformer and the aging degree of the insulation, and is an indicator that needs to be paid close attention to in the operation and maintenance of the transformer. Since the oil-immersed air-cooled cake-type winding transformer winding is wrapped in an oil-paper insulation system, its temperature is difficult to measure with an ordinary thermometer. At present, there are two commonly used temperature measuring devices for transformer windings. One is to directly measure the temperature of the winding parts with a built-in fiber grating and other temperature measuring devices in the transformer. This method is accurate, but the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K13/00G01K7/18
CPCG01K7/18G01K13/00
Inventor 张鑫段明辉刘继平姚创郗晓光王伟冯军基李松原姜云龙
Owner ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO
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