3660-MANUL-V01.01.00-CDC3 Operating Manual
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2.6
HFCT Reference
The CDC will attempt to obtain a phase reference from flowing current through the HFCTs sheath. This 50Hz
or 60Hz current is due to the cable capacitance, or in some circumstances may be down to induction from the
phase conductors.
A current of approx. 10A is required to give a reliable reference - if lower, the reference may become intermittent
and/or unreliable. The phase reference LED may also occasionally change between green and orange. In this
event it is recommended to replace with the phase reference transformer.
If the instrument is being used in Single Phase (1P) mode it will only attempt to detect the phase reference on
channel 1, however, if being used in three-phase (3P) mode all three input channels (1,2,3) will be attempted.
This information is logged in the capture reports which can be viewed at the end of the data capture process.
2.7
Taking PD Measurements using a HFCT
Using the CDC with a HFCT for detection of Partial Discharge (PD) on single or three-phase cables can be done
non-intrusively using multiple configurations. The configuration of the test setup is highly dependent on the
accessibility and layout of the location of the test. For more information on configuring a test using HFCT
consult the HFCT manual and if further assistance is required contact EA technology.
Figure 3
Image of a HFCT1-F50
2.8
Calibration
It is recommended that the CDC is calibrated annually. Information on the calibration date and due date can
be found by navigating to “About” in the CableData
®
Collector software (shown in figure 4).
Figure 4
About button in CDC Software
