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What is the method of phase imbalance detection and tripping in TeSys Giga OLR?

Tripping signal shall be sent by phase imbalance protection when detecting imbalance ratio is above 40%. And phase imbalance trip time is 5s(with tolerance ± 20%).
The definitions of phase imbalance ratio and average current according to Annex T T.5.5 IEC60947-1.