Numerical Study of Electromagnetic Loss and Heat Transfer in an Oil-Immersed Transformer

Table 3

Hot spot temperatures for different regions with different computational grids.

Total grid numbers	Regions	Maximal grid size (cm)	Minimal grid size (cm)	Grid numbers	Hot spot (K)	Extrapolated value (K)	GCI number (%)
923 456	Core	5.83	1.67	41 736	383.38	366.79	0.9
	Coil	3.14	1.14	44 712
	Metal component	6.01	1.06	41 746
	Oil	15.04	1.01	795 262
1 812 723	Core	5.44	1.25	78 400	373.45
	Coil	2.11	1.01	83 040
	Metal component	4.87	1.16	99 138
	Oil	14.01	0.95	1 552 145
3 560 081	Core	5.24	1.00	195 172	369.46
	Coil	1.90	0.86	149 100
	Metal component	4.87	0.78	195 745
	Oil	11.11	0.72	3 020 064