WEI Weak end infeed logic
VT Voltage transformer
X.21 A digital signalling interface primarily used for telecom equipment
3I
O
Three times zero-sequence current.Often referred to as the residual or the
ground-fault current
3V
O
Three times the zero sequence voltage. Often referred to as the residual
voltage or the neutral point voltage
Section 27 1MRK 502 066-UUS B
Glossary
1424
Technical manual
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