NDB Technologies CTT Series User Manual page 20

8. Operation
8.1 Manual Mode Operation
This section explains how to operate the CTTx5 and CTTx2 in manual mode. It is
assumed the CT under test is not installed in a power transformer, circuit breaker
or any other larger system.
8.1.1 Connections
1. Before connecting the CTT instrument to any other cable/equipment, make
sure the ground post is earthed properly using the provided ground cable.
2. Connect the CTT to a power source and then turn on the instrument.
3. Connect X1 and X2 clips to the CT's secondary terminals. The manual mode
only allows single winding testing at a time and therefore, only X1 and X2 clips
are used. Clips X3, X4 and X5 are left floating (CTTx5), or are non-existent in
case of a CTTx2.
4. Connect H1 and H2 clamps to the primary side of the CT under test. Make
sure to respect the CT polarity. CTs are typically marked with a label on their
H1 side.
5. In order to reduce nearby induction effects, the terminal on which is connected
the H2 clamp, must be shorted to ground.
3
H1
4
C T T S e r i e s
2
1
Leave floating
(CTTx5 only)
4
- U s e r M a n u a l
5
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