ABB IEC 61850 Edition 2 Communication Protocol Manual page 67

1MRK 511 393-UEN A
670 series 2.2 IEC
Communication protocol manual
UV
WEI
VT
X.21
3I
O
3U
O
clock, and uses the Gregorian calendar. It is used for
aeroplane and ship navigation, where it is also sometimes
known by the military name, "Zulu time." "Zulu" in the
phonetic alphabet stands for "Z", which stands for
longitude zero.
Undervoltage
Weak end infeed logic
Voltage transformer
A digital signalling interface primarily used for telecom
equipment
Three times zero-sequence current.Often referred to as the
residual or the earth-fault current
Three times the zero sequence voltage. Often referred to
as the residual voltage or the neutral point voltage
Section 9
Glossary
61