SS | 36 | 28.2 |
SSWS | 64 | 47.74 |
DS | 92 | 70.6 |
SS | y = 0.0379x + 12.664 | 0.76 | |
SSWS | y = 0.0667x + 17.747 | 1.6 | |
DS | y = 0.0923x + 21.801 | 2.2 |
SS | y = 0.0269x + 16.545 | 0.83 | |
SSWS | y = 0.0527x + 25.817 | 0.45 | |
DS | y = 0.0736x + 30.293 | 1.4 |
SS | 40 | 29 |
SSWS | 72 | 52 |
DS | 96 | 72 |
SS | y = 0.0371x + 16.728 | 1.1 | |
SSWS | y = 0.073x + 26.066 | 0.61 |
Method | IDC | Cross capacitive | Cross capacitive | Thin film based MIP | Thin film parallel plate | Optical | Optical |
Remark | Simple and exact | Simple and exact | Simple and exact | Complex | Simple | Complex | Complex |
Usage | Insulating oil degradation detection | Insulating oil degradation detection | Non-contact Microdroplet detection | 2-FAL detection in transformer oil | Detection of moisture in oil | Detection of moisture in oil | Detection of 2-FAL in transformer oil |
Range | 0–50 ppm | 0–60 ppm | ……… | 0–20 ppm | 0–90 ppm | 0–5% | 0–2 ppm |
Relative humidity | |||||||
Contactless | Yes | Yes | Yes | No | No | No | No |
Accuracy | High, depends on sensor length | High, depend on single length | High, depend on single length | Moderate | Moderate | Moderate | Moderate |
Re-useable | Many times | Many times | Many times | Only 1 time | Few time | Few time | Few time |
Sensitivity | 72 fF/ppm in moisture; 96 fF/ppm in 2-FAL | 0.303fF/ppm in moisture, 0.59 fF/ppm in 2-FAL | ………. | 0.084 pF/ppm | 6 pF/ppm | ………. | ………. |
SS | y = 0.0297x + 12.45 | 0.61 | |
SSWS | y = 0.0497x + 16.811 | 1.1 | |
DS | y = 0.0708x + 20.57 | 2.1 |