Cable fault pre-location Syscompact 2000 M pro
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This formula shows that it is necessary to specify a correct velocity of propagation for precise
determination of the fault distance. If the velocity of propagation is not known, it can be
calculated with the cable length.
Note: Time Domain Reflectometry not is suitable for locating high-resistive cable faults, as
they produce very minor or no impedance changes at the fault position.
12.3.2 Available TDR methods
The IRG 2000 time domain reflectometer can be used to carry out various TDR methods. The
following table provides an overview of the methods.
Method Meaning
TDR
A measurement is performed and the measurement values are recorded.
TDR
Continuous
The measurement runs continuously until the measurement is stopped manually. If a
measurement is performed over a long periods, changes can be identified in the cable.
TDR Trigger
The measurement is performed when an external measuring device (e.g. a clip-on current
transformer) detects a specific current value. The method is suitable for intermittent cable
faults in a low-voltage network.
To carry out a measurement, connect the external measuring device to the Trigger Input
port on the IRG 2000 and select the threshold value for the current (Trigger current
level).
12.3.3 Setting TDR parameters
On the IRG 2000
1. If required, set the general pre-location parameters.
Further information: Chapter Setting the general pre-location parameters on the IRG 2000
(on page 52)
2. Press the MENU key.
3. Use the rotary knob to select the Mode menu item and press the rotary knob.
4. Use the rotary knob to select the desired TDR method and press the rotary knob.
The method is selected.
Further information: Chapter Available TDR methods (on page 54)
5. Press the MENU key.
6. Use the rotary knob to select the Settings menu item and press the rotary knob.
7. Use the rotary knob to select the desired TDR parameter and press the rotary knob.
8. Set the parameters using the rotary knob.
The following table provides an overview of the pre-location parameters that you can
define.
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