Operation
31
Proceed as follows to perform sheath fault pinpointing:
Step Description
1
In the main menu, call up the menu item
.
2
Set the voltage, the current and the duty cycle.
3
Start the pinpointing via the menu item
.
4
Press the “HV ON” push-button .
Result:
The HVB 10 with the set pulsing couples the DC pulse in the shield
affected by the earth fault. Devices equipped with the "AF" option transmit a
8.44 kHz audio frequency signal in parallel.
5
Locate the fault location or trace the line (devices with “AF” option only) with the
assistance of a suitable receiver (e.g. ESG, A-frame or FL 10).
For detailed instructions on how to use the receiver, please read the
respective manual.
WARNING
•
Do not leave the system in operation unattended and
accessible to the third parties. Lock the location securely or
instruct an authorised person to monitor the system.
•
Due to the current emerging into the ground at the fault
location, a step potential is produced. Depending on the
current rating and the respective ground and weather
conditions, this voltage can exhibit different values near the
fault location. When pinpointing with the aid of a earth
leakage detector, close attention must be paid to the
respective voltages measured in order to detect dangerous
voltages in time. In such an event, the current rating on the
HVB 10 must be reduced accordingly.
6
After completing the pinpointing of the sheath fault, press the “HV OFF” push-
button
to switch off the pulsed DC.
Procedure
