T-305E User Manual Version 3.5 | 16
There are five cables that are connected to the device, these are:
1.
High Voltage Test Cable - The red high voltage cable should be connected to the
faulty core of the cable under test, the transparent cable should be connected
to the metal sheath, and the metal sheath should be grounded (the Working
GND).
2.
Protective GND Cable - This cable should be connected to a separate grounding
point from the Working GND for safety reasons.
3.
Auxiliary GND Cable - Use a metal drill rod for grounding. Again, for safe
working, this needs to be separated from the Protective GND.
4.
Power Cable - This is to connect to the 220/240V AC supply.
5.
TRIGGER/SIGNAL Cable
–
This is to connect to the TRIGGER/SIGNAL port of the
cable fault locator T-906.
Note: The Protective GND should be electrically separated from the Working GND (GND).
This is to protect the shell of the instrument from the inducing voltage during high voltage
discharge. This is also to protect the user from being injured in case of any T-305E current
leakage.
Warning: Separate the Working GND with the Protective GND, they cannot be connected
to one point.
When it is discharging, the voltage of the working GND point will be raised to
thousands of volts in a second. If the Protective GND is not separated from the Working GND,
the high voltage may transmit through the protective earth lead onto the shell of the T-305E,
causing damages to the instrument and injury to the user.
iv.
Ensure that the retractable discharging rod is securely attached then clip the other end
on the Working GND point. The discharge rod should be readily accessible beside theT-
305E.
v.
After examining all the cables to ensure the connections are correct, the T-305E can
then be powered-on.
5.3
Modes of operation
The T-305E has three modes of operation selectable from the mode switch (figure 4.3 item
8), these are DC mode, Pulse mode and Cyclic mode.
5.3.1
DC mode
The DC mode is used for the DC Flashover method (section 6.1), the DC Voltage Withstand
Test (section 7) and it can also be used as a power source for sheath fault testing with the
Kehui T-H200 (section 9).
5.3.2
Pulse mode
The Pulse mode is used for the other pre-location methods; the Impulse flashover method
(section 6.2), the Impulse current method, or ICM (section 6.3) and the Secondary/Multiple
impulse method or SIM/MIM (section 6.4).
5.3.3
Cyclic mode
The Cyclic mode is used for pinpointing using a separate acoustic/electromagnetic detector
such as the Kehui T-506 (section 8).