Multiparameter-Based Fuzzy Logic Health Index Assessment for Oil-Immersed Power Transformers

Table 4

Ranges obtained for summed parameters.

Summed parameters	Input category ranges
	Low (L)	Moderate (M)	High (H)	Critical (C)
DGAF	0 ≤ 17.5	17.5 < M ≤ 35	35 < H ≤ 52.5	52.5 < C ≤ 70
OQF	0 ≤ 15	15 < M ≤ 30	30 < H ≤ 45	45 < C ≤ 60
FF	0 ≤ 2.5	2.5 < M ≤ 5	5 < H ≤ 7.5	7.5 < C ≤ 10