MR MSENSE DGA 2 - Settings for Carbon Monoxide (DGA 3 Only), Hydrogen and H2 O Concentrations in the Oil

7 Commissioning
Messko GmbH 202054 BA4001150/10 ENMSENSE
®
DGA 2/3
▪ Modbus address
▪ Service database
▪ Field calibration
▪ Default calibration
7.4.1 Settings for carbon monoxide (DGA 3 only), hydrogen and H2O
concentrations in the oil
The upper warning and alarm values for the carbon monoxide content (CO)
(MSENSE®DGA3 only), the hydrogen content (H2) and the H2O concen-
tration can be specified.
Along with the limit values specified in the standards, you have the option
here of determining system-specific limits based on data collected or empiri-
cal values.
In the event of a limit value being exceeded (e.g. gas concentration in the oil
or gas formation rate), a warning message can be issued via the relay con-
tact. You can configure the respective settings using the MESSKO®MSET
parameterization software in accordance with the corresponding operating
instructions.
Carbon monoxide CO limit values (MSENSE®DGA3 only)
Limit value Default*) Minimum Maximum
Concentration too high warning 350 ppm 0 ppm 2000 ppm
Concentration too high alarm 570 ppm 0 ppm 200 ppm
Gas formation rate too high warning 30 ppm/d 0 ppm/d 80 ppm/d
Gas formation rate too high alarm 50 ppm/d 0 ppm/d 80 ppm/d
4mA signal setting 25 ppm 25 ppm 1999 ppm
20mA signal setting 1000 ppm 26 ppm 2000 ppm
Table7: Carbon monoxide (CO) limit values
*) Recommended values based on IEEEC57.104, Condition1
Hydrogen (H2) limit values
Limit value Default*) Minimum Maximum
Concentration too high warning 500 ppm 0 ppm 2000 ppm
Concentration too high alarm 700 ppm 0 ppm 2000 ppm
Gas formation rate too high warning 30 ppm/d 0 ppm/d 80 ppm/d
Gas formation rate too high alarm 50 ppm/d 0 ppm/d 80 ppm/d
4mA signal setting 15 ppm 15 ppm 1999 ppm
20mA signal setting 1000 ppm 16 ppm 2000 ppm
Table8: Hydrogen (H2) limit values