Hybrid Diagnosis Approach unit: ppm								C1 State	C2 State	C3 State	C4 State
Testing	H₂	CH₄	C₂H₆	C₂H₄	C₂H₂	CO	State
Testing	128	25	5	81	288	143	State
The ANSI/IEEE C57.104 Standard Rule	H₂ Content Value’s Result						At	At	At	At	N
	CH₄ Content Value’s Result						N	At	Ab	At	N
	C₂H₆ Content Value’s Result						N	At	D	At	N
	C₂H₄ Content Value’s Result						At	D	D	D	N
	C₂H₂ Content Value’s Result						D	Ab	N	N	N
	CO Content Value’s Result						N	N	N	At	N
The Linear SVM Discriminant Formual Diagnosis	Abnormal						−2114	−270	−85	−55	3
	Abnormal						−3228	−311	−49	−38	2
	Overheating						26	−9	0	−3	1
	Electric arc						−17	9	8	10	5
	Overheating + Discharge						49	26	−3	9	2
	Oil mixes in						8	41	56	16	−5
The Roger & Doernenbeg Combination Diagnosis	T1 (Thermal Fault < 300˚C)						False	False	True	False	False
	T2 (Thermal Fault 300˚C - 700˚C)						False	False	False	False	False
	T3 (Thermal Fault > 700˚C)						False	True	False	True	False
	D1 (Low Energy Partial Discharge)						False	False	False	False	False
	D2 (High Energy Discharge)						True	False	False	False	False
The Key Gas Method Diagnosis	Overheating						False	True	True	True	False
	Corna						True	False	False	False	False
	Arcing						False	False	False	False	False
	Paper-fiber Overheating						False	False	False	False	False