Diagnosis and Classification Decision Analysis of Overheating Defects of Substation Equipment Based on Infrared Detection Technology

Table 1

Determination of relative temperature difference of current heating equipment.

Type of equipment	Relative temperature difference fault range
	General fault type	Major thermal failure	Emergency thermal failure
SF6 circuit breaker	≥20%	≥80%	≥95%
Vacuum circuit breaker	≥20%	≥80%	≥95%
Oil-filled casing	≥20%	≥80%	≥95%
High-voltage switchgear	≥35%	≥80%	95%
Isolating switch	≥35%	≥80%	≥95%
Other conductive equipment	≥35%	≥80%	≥95%