Research Article
Model-Based Fault Detection and Isolation of a Liquid-Cooled Frequency Converter on a Wind Turbine
Table 4
Severity and occurrence analysis of faults both at startup and runtime phase in liquid-cooled frequency converter.
| Assessment Fault | Severity | Occurrence | SO | Priority |
| Startup faults |
| Air in cooling system | 9 | 3 | 27 | 1 | Phase module Cooling channel clogging | 9 | 2 | 18 | 1 |
| Runtime faults | Pump delivery pressure Decreasing | 8 | 2 | 16 | 2 | Pipe clogging | 8 | 2 | 16 | 2 | Pipe leakage | 8 | 2 | 16 | 2 | Air-cooled heat Exchanger cooling effect Decreasing | 6–8 | 2 | 16 | 2 | Valve blockage | 6–8 | 2 | 16 | 2 | Temperature sensor defect | 9 | 3 | 27 | 1 | Phase model loosening | 9 | 1 | 9 | 3 |
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