Study on the Effect of Temperature and Humidity on $\tan \delta$ Measurement of 110 kV Current Transformer

As an important equipment in substations, 110kV current transformers play a role in measurement, control, and protection. Insulation defects are prone to occur during operation, and preventive tests should be conducted regularly on current transformers. By measuring the tan <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\delta$</tex> of 110kV current transformers under different temperature and humidity conditions, the existing temperature and humidity conversion comes from the former Soviet Union. Due to changes in equipment materials, structures, etc., the original conversion factor may not be applicable now. The experiment studied the problem of the influence of temperature and humidity on the current transformer <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\tan \delta$</tex> due to the lack of on-site measurement. The experimental results were statistically analyzed using data analysis software such as Matlab, and a method for correcting the influence of temperature and humidity on the measurement results was obtained through Gauss Newton iteration. This provides a reference for on-site judgment of the insulation condition of current transformers.