C8.3 Wireless Measurement of Moisture Entry in SYLGARD-527
- SMSI 2021
2021-05-03 - 2021-05-06
- SMSI 2021 - System of Units and Metreological Infrastructure
- C8 Testing and Diagnosis
- K. Dehning, M. Hitzemann, S. Zimmermann - Leibniz University Hannover, Hannover (Germany)
- 304 - 305
Humidity highly affects the failure rate of silicone-potted frequency converters in wind turbines. In order to understand the entry process of moisture, in this work, possible pathways for humidity e.g. by diffusing through the silicone-potting compound or passing along boundaries are investigated by potted humidity sensors. To avoid the effect of cables as additional entry gateways and the diffusion through sidewalls humidity sensors were potted into silicone inside an open toped glass vessel at different positions, and inductively powered and read out via Bluetooth. The results show that under the experimental conditions the moisture mainly diffuses through the silicone and does not pass along the boundary layer between the silicone and the glass.