MiCOM P632
Checking Ground Differential Protection
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The current I to which the P632 responds for single-side feed, neutral-point side, is calculated as follows:

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z: transformer end (a, b)

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Idiff>: set operate value

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Inom: nominal current of the P632

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kam,z: amplitude-matching factor of transformer end a, b

There will be no trip for single-side, single-pole, phase-side feed.

The differential and restraining currents formed by the P632 are displayed. The display of differential and restraining currents is prevented, however, if they fall below minimum thresholds that can be set by the user.