Research Article

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

Figure 18

The CUSUM residual signal for detecting air-cooled heat exchanger cooling effect decreasing fault, the fault is started at time 6 0 0 [ 𝑠 ] by changing the supply voltage of the fan, and the fault is detected at time 6 3 2 . 5 [ 𝑠 ] .
684610.fig.0018