Criteria for data points in DGA diagnostics - OPT100

DGA Diagnostics view shows up to 26 data points from the past year. A data point that meets selection criteria is automatically selected at roughly two week intervals. If less than one year of data is available, all of the data is used.

The data points are 24 hour average values for the included gases and must meet the following criteria for each point:

• At least 5 reliable measurement points must exist in the previous 24 hours. Reliability criteria are the same as for gas alert functionality.
• At least one of the following conditions is true:
  • Concentration of all triangle 1 gases is higher than OPT100 accuracy as listed in Table 1
  • At least one of the triangle 1 gases is above the limit based on IEC 60599 as listed in Table 1

Table 1. Data point selection criteria

Gas	OPT100 accuracy specification in ppm	Limits based on IEC 60599
Acetylene(C2H2)	2	4
Methane (CH4)	10	30
Ethane (C2H6)	10	30
Ethylene (C2H4)	10	30
Hydrogen (H2)	25	50