| Parameter | Output unit(s) | Description |
|---|---|---|
| Methane (CH4) | ppmv | Measured from extracted gas |
| Ethane (C2H6) | ppmv | Measured from extracted gas |
| Ethylene (C2H4) | ppmv | Measured from extracted gas |
| Acetylene (C2H2) | ppmv | Measured from extracted gas |
| Carbon monoxide (CO) | ppmv | Measured from extracted gas |
| Carbon dioxide (CO2) | ppmv | Measured from extracted gas |
| Hydrogen (H2) | ppmv | Measured in-oil |
| Moisture (H2O) | ppmw and %RS | Measured in-oil as relative saturation (%RS). See Calculating relative moisture saturation inside transformer. |
| Total gas pressure | hPa and psi | Measured from the sampled oil volume |
| Property | Output unit(s) | Description |
|---|---|---|
| Total dissolved combustible gases (TDCG) | ppmv | Combined total of H2, CO, CH4, C2H6, C2H4, and C2H2. |
| 24 h average |
ppmv for gases ppmw for moisture hPa and psi for total gas pressure |
Available for single gases, moisture, TDCG, and total gas pressure |
| Rate of change (ROC) | ppmv | Available for single gases and TDCG for 24 h, 7 d, and 30 d periods |
Gas ratios for:
|
Ratio | Ratio is calculated from 24 h average values of the gases |