NV1981
Electrical
- Apr 8, 2014
- 1
As per IEC the maximum allowable dew point of SF6 in GIS chamber is -5degree at rated filling pressure at 20 degree C
The measured value of dewpoint of SF6 in a GIS compartment is (instrument used is MBW 973) :
Dew Point at vessel pressure =0.4 degree
Gas pressure relative = 6.23 bar (this is the pressure shown in the instrument which is not temperature compensated. The GDM in GIS chamber was showing rated filling pressure of 5.8 bar – temperature compensated gauge)
ppmv= 892.1
Temperature of the enclosure = 34.4 deg C (this is temperature measured on the enclosure)
How can we convert this dew point value to temperature 20degree C at rated pressure (rated filling pressure being 5.8 bar at 20 degree C)
This is to check if the measured value is within limits as specified by IEC
Thanks in advance
The measured value of dewpoint of SF6 in a GIS compartment is (instrument used is MBW 973) :
Dew Point at vessel pressure =0.4 degree
Gas pressure relative = 6.23 bar (this is the pressure shown in the instrument which is not temperature compensated. The GDM in GIS chamber was showing rated filling pressure of 5.8 bar – temperature compensated gauge)
ppmv= 892.1
Temperature of the enclosure = 34.4 deg C (this is temperature measured on the enclosure)
How can we convert this dew point value to temperature 20degree C at rated pressure (rated filling pressure being 5.8 bar at 20 degree C)
This is to check if the measured value is within limits as specified by IEC
Thanks in advance
