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

Table 8

List of fault detection time for different faults in the cooling system.

Fault	Detection time [s]
Startup faults
Air in cooling system	30.1
Phase module cooling; channel clogging	31.8
Runtime faults
Pump delivery pressure decreasing	47.7
pipe clogging	47.7
Air-cooled heat exchanger; Cooling effect decreasing	32.5
Temperature sensor — bias output	0.8