What are the correct micro-ohm readings (contact resistance) for an HVL/cc switch?
Issue:
When do switch contacts need to be replaced on a HVL/cc switch ?
Product Line:
HVL/cc Medium voltage Switch
Environment:
Maintenance
Cause:
Preventative
Resolution:
The contact life can be verified by performing a millivolt or micro-ohm meter test. The value should not increase by 300% of the original value of 80 micro-ohms using a 100 A test micro-ohm meter. (Should not exceed 240 micro-ohms). NOTE: The loads may not be the same on each phase. Therefore, the contact resistance will vary on each phase.
When do switch contacts need to be replaced on a HVL/cc switch ?
Product Line:
HVL/cc Medium voltage Switch
Environment:
Maintenance
Cause:
Preventative
Resolution:
The contact life can be verified by performing a millivolt or micro-ohm meter test. The value should not increase by 300% of the original value of 80 micro-ohms using a 100 A test micro-ohm meter. (Should not exceed 240 micro-ohms). NOTE: The loads may not be the same on each phase. Therefore, the contact resistance will vary on each phase.
Released for: Schneider Electric USA
