Secondary Terminal Box; Secondary Terminals; Hf Terminal - GE OTCF Instruction Manual

Instruction Manual

5.2. Secondary terminal box

Before opening
terminal box, check the position of
the EMU and carrier grounding
switches. A warning plate is supplied
with the CVT and is placed on the
secondary terminal box on the side of
the potential grounding switch.

5.3. Secondary terminals

Look for the set of drawings of the
CVT to verify the type of connection
to the secondary terminal
acceptable cables for the connection.
Use proper connectors to ensure a
good connection. Tightening torque is
indicated on the secondary terminal
box drawing.
One point of each secondary should
be connected to the ground terminal
inside the secondary terminal box, in
order to obtain a ground point for the
potential reference.
Unused secondary terminals must
remain open circuit and one point of
the unused secondary terminal must
be connected to the ground terminal.
© GE Grid Solutions
the secondary
and
This grounding should be done at
one point only, as far away as
possible from the CVT, preferably in
the control room. Multiple grounding
points may cause transient voltage
difference that can cause circulation
of surge currents between windings,
rather than flowing
windings to the earth.
When a secondary winding is used in
a broken delta connection with
secondary windings of CVT from other
phases, ensure that there is only one
grounding point on the broken delta
connection as shown below.
NEVER SHORT CIRCUIT THE
SECONDARY TERMINAL OF A
CVT
.

5.4. HF terminal

When available, for connection to the
carrier system, connect the lead-in
cable through
undrilled gland plate of the secondary
terminal box to the 'HF' terminal. The
figure below shows the typical
position of the 'HF' terminal. Confirm
the position of this terminal in the
CVT secondary terminal box.
from the
the removable