ABB ZX2 - Wiring of Voltage Transformers

3. INSTALLATION OF THE SWITCHGEAR AT SITE 55
3.3.7.6. Wiring of voltage transformers
The voltage transformers are fitted with terminal
boards. The possible configurations of terminal
boards can be found in fig. 3.3.7.6.1 and table
3.3.7.6.1.
—
Fig. 3.3.7.6.1:
Possible terminal
board configurations
Windings Terminals
Number Tap
open delta
winding
     
1 N a n
1
●
N a n da dn
1
●
N a1 a2 n
1
● ●
N a1 a2 n da dn
2 N 1a 1n 2a 2n
2
● (
1
)
1a 1n 2a 2n da dn
2
● (
1
)
1a1 1a2 1n 2a1 2a2 2n
—

1) In a voltage transformer version with two
windings plus tap or two windings plus open
delta winding, "N" is implemented at the
base plate of the voltage transformer.