Do you know what common temperature measuring devices are used in dry transformers?

As an important equipment in the power system, the temperature monitoring of dry-type transformer is crucial. The following are several common temperature measuring devices and their characteristics of dry-type transformers:

Content

lmometer

Platinum thermal resistance is a commonly used sensor in transformer temperature measurement. Its resistance value changes with the temperature change. By measuring the resistance value and comparing the curve, the temperature value can be accurately obtained. It has the advantages of high accuracy and good stability, and can accurately reflect the temperature change of the transformer. However, the response is relatively slow and may not capture temperature mutations in time.

lthermocouple sensor

The thermocouple sensor works based on the principle of thermoelectric effect and is suitable for measuring the temperature of high temperature parts such as transformer winding. It has the advantages of fast response speed, wide measurement range and high temperature resistance. However, the output voltage of the thermocouple is small and susceptible to external interference, which requires the use of highly sensitive measuring instruments.

lDry-type transformer temperature controller

This temperature controller is designed for dry type transformer and using single chip machine technology to detect and display the winding temperature rise through the platinum thermal resistance embedded in the transformer windings. It has alarm and control functions, which can effectively prevent the transformer from overheating. But its installation and maintenance are relatively complex, and the cost is relatively high.

linfrared radiation thermometer

Infrared thermometer calculates the internal temperature by measuring the infrared radiation emitted by the transformer surface, which has the advantage of non-contact measurement. It has high measurement accuracy and is suitable for rapid detection of transformer surface temperature. However, the infrared temperature measurement is affected by the environmental temperature, radiation Angle and other factors, and there may be some errors.

In Summary

To sum up, various temperature measuring devices have their own advantages and disadvantages, so appropriate temperature measuring devices should be selected according to the actual requirements and scenarios to ensure the safe operation of dry-type transformer.

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