ABB PST Series Installation And Commissioning Manual page 132

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If the current in one phase differs from another phase with
more than the set level the protection is activated.
The protection starts monitoring 30 seconds after full
.
voltage
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Phase Imb No
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This parameter makes it possible to set the level of the
phase imbalance protection. It is active only if the Phase
imbalance protection is selected.
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Ph Imb Lev 80%
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Yes, No Phase imbal-
ance protection
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10...80% Trip level for
Phase imbal-
ance protection
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