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CT/PT Modules
CT/PT
Interface
Modules
The CT and PT interface modules are field replaceable.
Each of the maximum five modules holds three CTs or PTs, for a total of
fifteen transformers.
Use Pullers
CT input wiring must be shorted externally before servicing the CT
transformers
• Open circuiting a Feeder CT will result in feeder voltage being present at the
secondary of the CT.
• These Hazardous Voltages may result in equipment damage, shock, burns or
death
Procedure:
Removal
Steps to remove the CT and/or PT interface modules
Step Action
1 Unplug the transformer connectors to disconnect the secondaries
from the module.
2 Remove the module by sliding it toward the front of the open D25,
then lifting it from the Snap-On PEM studs.
3 Move it forward and out the front of the open D25.
Procedure:
Replacement
Steps to replace the CT and/or PT interface modules.
Note: The use of 42x nominal CT modules requires that you enter calibration
factors in the D25’s configuration. See: 42x Nominal CT Module
Step Action
1 Move the card into position and lower it onto the Snap-On PEM
studs.
2 Push it into the D25 until the card snaps firmly in place on the
PEM studs.
3 Plug the transformer secondaries into connectors, observing proper
orientation and arrangement. Transformer secondary wires should
not cross each other.
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