Flevoland, Netherlands
Noordpolder WTG 03
Polder turbine with a recurring converter trip. Seven anomalies, converter cabinet at 79 °C.
18
ha
Area covered
44
min
Flight time
7
flagged
Anomalies found
79
°C
Hottest reading
Findings
Converter cabinet at tower base: 79.0 °C
Yaw motor 2 running 14 K above motors 1, 3 and 4
Five minor blade surface defects
Debrief
The tower base was flown at 6 m with the cabinet doors closed; the hot face matched the converter’s IGBT stack.
The yaw motor finding was not part of the brief. It was filed anyway, because it was above threshold.
We asked about the converter. It also found the yaw motor we had not asked about.
Pieter de Vries, service engineer
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