Electrical Engineering · Power System Protection
What does the Plug Setting Multiplier (PSM) represent in the operation of an electromagnetic protective relay?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1It is the ratio of the secondary fault current to the relay pick-up current setting.✓
- 2It is a manual mechanical dial used to directly adjust the physical time dial settings.
- 3It represents the maximum absolute fault current the relay hardware can physically survive.
- 4It is a constant scaling factor independent of the actual fault current.
Correct answer
It is the ratio of the secondary fault current to the relay pick-up current setting.
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