An Investigation of the Electrical Properties of Pressboard Impregnated with Mineral Oil-Based Nanofluids at Different Concentrations of Fe₃O₄ Magnetic Nanoparticles

Table 5

Results of the AC breakdown strengths of the impregnated pressboard.

Impregnated Pressboard Samples with	AC breakdown strengths (kV)		SD
	Average	kV/mm
Mineral Oil (MO)	65.84	41.15	0.36
MO + Fe3O4 (0.01%)	69.13	43.20	0.64
MO + Fe3O4 (0.03%)	74.29	46.43	0.45
MO + Fe3O4 (0.05%)	71.79	44.86	0.54

^∗SD = Standard deviation of the data on AC tests.