BENSHAW RediStart MX3 Series, User Manual

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3 - INSTALLATION
3.7.3 Zero Sequence Ground Fault Current Transformer
The Zero Sequence Ground Fault CT can be installed over the three phase conductors for sensitive ground current detection or for use
with high resistance grounded systems.
The correct installation of the current transformer on the motor leads is important. The shield ground wire should also be passed through
the CT window if the motor conductors use shielded cable. Otherwise, capacitive coupling of the phase current into the cable shield may
be measured as ground fault current. See figure below for proper installation.
Figure 13: BICT 2000/1-6 Mechanical Dimensions
GROUND ON STARTER
POWER CABLE
TO MOTOR
GROUND WIRE DOES
NOT PASS THROUGH CT
CORE BALANCE
CT SECONDARY
CONNECTION TO
J15 ON MX
³
CARD
LUGS TO LOAD
TERMINALS ON
STARTER
50:0.025 CORE
BALANCE CT
Figure 14: Zero Sequence CT Installation Using Unshielded Cable