Comparative Performance Study of Dissolved Gas Analysis (DGA) Methods for Identification of Faults in Power Transformer

Table 13

Identification of fault coding used on three-ratio method [12].

Gases ratio code			Fault type
	NS			Thermal faults , °C
			Thermal faults , °C
				Thermal faults , °C
					Thermal faults , °C
						Low-energy discharge
			High-energy discharge
				Low-energy corona partial discharge
			High-energy corona partial discharge
			Mix of electrical and thermal fault