Hitachi Relion 670 Series Communication Protocol Manual page 56

Section 5
Glossary
3I
O
3V
O
50
Three times zero-sequence current.Often referred to as the residual or the
ground-fault current
Three times the zero sequence voltage. Often referred to as the residual
voltage or the neutral point voltage
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1MRK511391-UUS Rev. L
DNP, 670 series
Communication protocol manual