Model-Based Fault Detection and Isolation of a Liquid-Cooled Frequency Converter on a Wind Turbine

Table 2

Occurrence scale of fault in liquid-cooled frequency converter.

Probability	Failure Rate	Ranking
Very high	≥20% of faults	4
High	10–19% of faults	3
Moderate	4-5% of faults	2
Low	1-2% of faults	1