Howard HI-110 Network Transformer - Manual (Page 20)

Document 2.4.128, Revision 2
August, 2012
20
Network Transformer Instruction Manual
Secondary Bushings
Three externally-removable secondary bushings are
bolted to the main tank wall inside the secondary
throat. Each is fitted with a flexible connector for
connection to a network protector. The low-voltage
neutral connection consists of a blade welded to the
main tank or, when specified by the user, a fully-
insulated bushing.
Current Transformers
Optional current transformers (CT’s) are supplied
when specified, to allow remote measurement of
secondary phase currents. When provided, CT’s
are mounted inside the main tank, immersed in
insulating fluid. CT leads are brought out to an
external junction box mounted on the main tank.
Transformers are shipped from the factory with CT
leads shorted together and grounded. If the CT’s
are not connected to a metering load by the user,
they must remain shorted and grounded to avoid
hazardous voltage at the CT secondary terminations.
WARNING
FAILURE TO FOLLOW THE INSTRUCTIONS
BELOW COULD RESULT IN DEATH OR
SERIOUS PERSONAL INJURY AND MAY ALSO
RESULT IN DAMAGE TO THE EQUIPMENT.
CT leads must be connected to a load or
short-circuited and grounded before the
transformer is energized to avoid hazardous
voltage at the CT terminals.
Other Accessory Devices
Network transformers may be supplied with
accessory devices not discussed in these
instructions. In such cases, contact the Howard
Industries Transformer Division for information.