Cable Pd Measurement; Practical Rfct Connection Requirements; Measuring Pd In Cables - EA Technology UltraTEV Plus2 Operating Manual

EA Technology UltraTEV Plus
8.2

Cable PD Measurement

To perform Cable PD measurements, the RFCT accessory needs to be connected to the
UltraTEV Plus². The RFCT connects to the Smart accessory port found on the left hand side
of the instrument.
EA Technology RFCTs are designed to be installed by suitably competent
operators on cable earth/ground straps which are suitably and efficiently
connected to earth/ground to maintain safety.
RFCTs, connecting leads and test equipment do not provide protection
against high voltage.

8.2.1 Practical RFCT Connection Requirements

Using the RFCT for online PD tests on medium voltage power cables requires direct access
to the earth bonding strap. If present the split core radio frequency current transformer
RFCT can simply be clamped around the earth cable. This method can be used on-line
without disconnecting cables or switching off supplies to customers.
With XLPE cable installations the user can normally get access to the cable earth strap or
the core of the cables. The earth strap can be looped out of the termination box to give
better access. With PILC (Paper Insulated Lead Covered) cables difficulty may arise attaching
the RFCT as the cable earth and switchgear earth can be bonded together. This is more
usual on older PILC cables using compound filled cable boxes.

8.2.2 Measuring PD in cables

Switch on the UltraTEV Plus² and wait until home menu is displayed. If the conditions set
out above are met, install the RFCT around the earth strap of the cable under test. Proceed
to connect the fitted RFCT to the UltraTEV Plus² using the supplied cable; connect the BNC
to the RFCT and the LEMO™ connector into the Smart accessory port as shown below. The
home menu on the UltraTEV Plus² will now display a Cable PD icon in place of the usual
TEV icon.
Operating Manual
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