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

Table 6

Results of the lightning impulse breakdown voltage of the impregnated pressboard.

Lightning impulse breakdown voltage (kV)					% Increase
Polarity	Impregnated Pressboard Samples with				Impregnated Pressboard Samples with
	MO	MO + Fe3O4 at 0.01%	MO + Fe3O4 at 0.03%	MO + Fe3O4 at 0.05%	MO + Fe3O4 at 0.01%	MO + Fe3O4 at 0.03%	MO + Fe3O4 at 0.05%
Positive	132.7	136.5	139.3	137.8	2.86	4.97	3.84
Negative	135.9	144.4	147.3	145.1	6.25	8.39	6.77