CT Lab Vecto III - Page 57

Vecto III User Manual
57
4.2.3.2 110 V Voltage Transformer (VT) Circuits & 400 V Direct (Star/ 4-wire
systems)
Terminal
Legend
110V VT Circuit or 400V/550V Star (4-wire) Systems
1.
V
1
Phase 1
2.
V
2
Phase 2
3.
V
3
Phase 3
4.
V
com
Neutral (Star connection point)
5.
V
4+
Earth (optional for 400 V systems only)
6.
V
4-
Star connection point (Neutral) (Optional and for 400 V
systems only)
Table 10: VT circuit connection layout for 4-wire star connection
• Connect Phase 1,2 and 3 to Voltage Inputs 1-3 as shown in Figure 29 below.
• Connect Neutral (on 400 V systems) or the star-point (on 110 V VT circuits) to
V
com
.
• The fourth voltage input may be used on 400 V systems to measure Neutral-
Earth voltage.
Always connect the safety earth terminal located on the power
connector first