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7 NADIR OPERATION
" CABLE PRE-IDENTIFICATION " function :
There are two options :
•
The remote Transducer is placed on the cable
•
Or just the Receiver, using the internal Transducer.
The measurement is carried out at the point of interest. Since the conductors are twisted in the cable,
and the modulation is between one phase and neutral or between 2 phases, move the Transducer
along or around the cable to seek the best signal.
This operation is first done in SEARCH mode, which gives an instantaneous measurement
(acquisition time
∼
2 seconds). During the acquisition, hold the transducer still.
When a significant signal is found, change to IDENTIFICATION mode, which gives a measurement
integrated over 5 seconds.
As an indication, drawing on our experience, the minimum values found on the correct cable are
around 35 to 40 % (according to the network and it’s load).
In ideal circumstances, the received level is from 70 % to 90 %.
On the "
wrong
" cables or phases, the signal is < 10 %.
3 Cables in the trench
∼
1 m
Measurement Measurement Measurement
1 2 3
with the NADIR Receiver
