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Device and method for measuring heat conductivity coefficient of transformer insulating oil under low-temperature condition

A technology of transformer insulating oil and thermal conductivity, which is applied in the direction of material thermal development, etc., can solve the problems of crystallization of insulating oil and reduction of insulating effect of insulating oil.

Pending Publication Date: 2021-04-16
国网内蒙古东部电力有限公司呼伦贝尔供电公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the insulating oil contains a small amount of water, under low temperature environment, the micro-water in the insulating oil will crystallize, which will greatly reduce the insulating effect of the insulating oil

Method used

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  • Device and method for measuring heat conductivity coefficient of transformer insulating oil under low-temperature condition

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A device for measuring the thermal conductivity of transformer insulating oil under low temperature conditions, which simulates the actual working environment of insulating oil, and conducts a stable cooling process through the semiconductor electric cooling chip stack 13 of the thermal insulation layer 04 inside the device box, and finally controls the temperature at -40°C Left and right, the humidity is adjusted to 30% R.H. The following are the specific steps of the measurement using the device:

[0042] (1) Fill the experimental oil cup 02 with insulating oil 12 with a moisture content of 1%, set the initial temperature to 10°C, and the ambient humidity to 50% R.H. Turn on the pipeline fan 05 to stabilize the temperature and humidity in the container, then turn off the fan 05;

[0043] (2) The test water in the test chamber is deionized water. Before the test, ensure that the water level in the humidifier meets the normal working level;

[0044] (4) Adjust the ambien...

Embodiment 2

[0049] A device for measuring the thermal conductivity of transformer insulating oil under low temperature conditions. The actual working conditions of the simulated insulating oil are as follows. The initial temperature is 10°C. When a cold wave comes, the temperature drops 60°C within 1 hour, and the ambient humidity in the power equipment is 50%. R.H, the moisture content of the insulating oil is 1%, and the specific measurement method using the device includes the following steps:

[0050] (1) Fill the experimental oil cup 02 with insulating oil 12 with a moisture content of 1%, set the initial temperature to 10°C, and the ambient humidity to 50% R.H. Turn on the fan 05 to stabilize the temperature and humidity in the container, then turn off the fan 05 ;

[0051] (2) Set the cooling rate to 1°C / min, open the liquid nitrogen pipeline 06, set the liquid nitrogen shutdown predetermined temperature to -45°C, when the temperature drops to -45°C, close the liquid nitrogen chann...

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Abstract

The invention provides a device and method for measuring the heat conductivity coefficient of transformer insulating oil under a low-temperature condition, and the device can simulate the real working condition of the insulating oil in an extremely cold region, and comprises a closed container, a heat conductivity coefficient measurement instrument, a temperature and humidity sensor and a temperature and humidity regulation and control device. The closed container is provided with an experiment door, an objective table and a beaker, transformer insulating oil is contained in the beaker, and a probe of the heat conductivity coefficient measuring instrument is immersed in the insulating oil; and the temperature and humidity sensor is arranged in the closed container, the temperature and humidity regulation and control device comprises a cooling and heating device, a humidifying and dehumidifying device and a pipeline fan, and the temperature and humidity regulation and control device is communicated with the closed container through a pipeline. According to the measuring method, the humidity environment of the insulating oil is accurately controlled, the temperature is rapidly increased or decreased or the temperature and the temperature range are accurately controlled by reasonably arranging, regulating and controlling the refrigerating device, the heating device, the dehumidifying device and the humidifying device, the change condition of the heat conductivity coefficient of the insulating oil under different real working conditions is monitored, and reference is provided for measurement of the heat conductivity coefficient of the transformer oil under the low-temperature condition.

Description

technical field [0001] The invention belongs to the field of electrical performance evaluation and fault diagnosis of insulating oil for high-voltage oil-paper insulating electrical equipment, and relates to a thermal conductivity measuring device and a measuring method for transformer insulating oil under low temperature conditions. Background technique [0002] Insulating oil in distribution transformers and other power devices in cold regions such as Northeast and Northwest my country will face the problem of being used at temperatures as low as -50°C. In this case, the insulating oil may be waxed and solidified. At present, most of the research on the dielectric constant of insulating oil at home and abroad involves the characteristic analysis at different temperatures. For simulating the real working conditions of insulating oil, such as under extreme cold conditions and high temperature conditions, under different ambient humidity, the insulation There are very few stu...

Claims

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Application Information

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IPC IPC(8): G01N25/20
Inventor 罗永利刘玉成曹春诚罗传仙丁仁杰段炼张辉罗子秋王杰王鹏浩邴龙朱家炜班晓萌李伟春刘弋铭
Owner 国网内蒙古东部电力有限公司呼伦贝尔供电公司
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