Figure 84 - Opening Electrical Wear Thresholds; Figure 85 - Arcing Contact Electrical Wear Alarms; Figure 86 - Electrical Wear Weighting Table - GE CB Watch 3 User Manual

Contact wear alarm
To receive a warning when we are approaching the time when the arcing contacts need
to be replaced due to wear, a comparison is made between the cumulative electrical
wear and the maximum value specified by the manufacturer of the arcing contacts used.
Alarms can be set per pole and with two threshold values:
- Threshold 1: a warning level (approaching contact wear limit)
- Threshold 2: an alarm level (contacts need to be replaced)
HMI: Settings / Opening
Any alarm raised can be seen in the HMI:
HMI: Measurements / Alarms
Non-linear contact wear
To account for the case where the electrical wear is not linear (higher wear at lower
currents for examples), the function above can be modified and act as a magnifying (or
reducing) factor for a given amp rating by entering a coefficient greater than 1.0 (or
smaller) into a table. A spreadsheet can be used to upload the data.
HMI: Settings / Opening
CB Watch 3 User Manual
Figure 79 – Opening electrical wear thresholds
Figure 80 – Arcing contact electrical wear alarms
Figure 81 – Electrical wear weighting table
v6.3 - May 2019 Page 53 of 100