!PPENDIX
6%
6
# ' #
-ATCHING TRANSFORMERS
)F THERE IS ANOTHER TRANSFORMER BETWEEN THE VOLTAGE TRANSFORMER OF THE GENERATOR FEEDER AND THE CIRCUIT BREAKER
EG OF VECTOR GROUP $Y THE VECTORS OF THE SYNCHRONIZING VOLTAGES MUST BE MATCHED IN MAGNITUDE AND DIREC
TION BY MEANS OF MATCHING TRANSFORMERS
4HE CIRCUIT DIAGRAM " IS THE CIRCUIT MOST COMMONLY USED THE CIRCUIT BREAKER 3 BEING CONTROLLED BY THE PARAL
LELING DEVICE
)N THE OTHER CIRCUITS SHOWN BELOW THE VOLTAGE VECTOR IS ROTATED ACCORDING TO THE VECTOR GROUP OF TRANSFORMER 4
4HE RATINGS OF THE INTERPOSING TRANSFORMERS ARE AS FOLLOWS WHEN THE VOLTAGE TRANSFORMER SECONDARY SIDE IS RATED
FOR 6 6
$ESIGNATION AND SECONDARY VOLTAGE 6 6
AND SECONDARY VOLTAGE 6 6
o
3
4
)
))
)))
METERING
PROTECTION
5
6
'
&IGURE " #ONNECTION OF MATCHING TRANSFORMERS EG FOR SYNCHRONIZATION AT THE SYSTEM SIDE
