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Tap-changer characteristics and technical data
Type designation
Example VUCGRE 650/700/C
Type of tap-changer
VUC... Diverter switch with vacuum interrupters
Type of regulation
L
Linear
R
Plus/Minus
D
Coarse/Fine
Type of connection
N
Three-phase neutral point (one unit)
E
Single-phase (one unit)
T
Three-phase fully insulated (three units)
B
Three-phase delta (two units; single-phase and two-phase)
Impulse withstand voltage to earth
VUCG:
380 kV, 650 kV, 750 kV, 1050 kV
VUCL:
380 kV, 650 kV, 750 kV, 1050, 1175 kV
Maximum rated through-current
See tables for diverter switches and tap selectors respectively.
The lowest rating of the two determines the overall rating.
Tap selector size
C
tap selector for VUCG only
III
tap selector for VUCG and VUCL
F
tap selector for VUCG and VUCL
Tap selector shielding
us
unshielded
s
shielded
18 Technical guide VUC | 1ZSC000562-AAX en, Rev. 1
VUCG . . XXXX/YYYY/Z .
VUCL . . XXXX/YYYY/Z .
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