Power Transformer Fault Severity Estimation Based on Dissolved Gas Analysis and Energy of Fault Formation Technique

Table 3

Fault categories [24].

No.	Characteristic	Fault type
1	F0	No fault
2	F1	Partial discharge (PD)
3	F2	Thermal fault of low temperature range T < 300°C (LTH)
4	F3	Thermal fault of medium temperature range 300°C < T < 700°C (MTH)
5	F4	Discharge (arc) of low energy (LED)
6	F5	Thermal fault of high temperature range T > 700°C (HTH)
7	F6	Discharge (arc) of high energy (HED)