Infrared Technology-Based Sensor Data Analysis for Thermal Fault Identification of Electrical Equipment in Intelligent Substations

Table 1

Detailed setting table of characteristic quantity parameters.

Serial number	Time-domain characteristic parameters	Content
1	Kurtosis	The numerical statistic reflecting the distribution characteristics of random variables is the normalized fourth-order central moment
2	Variance	A measure of the degree of dispersion of a random variable or group of data measured in probability theory and statistical variance
3	Phase lead	During the change process of several sinusoidal AC flows with the same frequency, they reach zero first relative to the timing starting point t = 0
4	Frequency mean	The mean value of the sample frequency distribution, that is, the weighted mean value of the group median with the group frequency as the weight
5	Root mean square value of amplitude	The square root of the mean of the sum of squares of the amplitudes