Besantek BST-GFL31, User Manual, Page: 13 / 33

BST-GFL31 User Manual
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2) If negative busbar has fault, connect black lead with negative and red lead with ground.
Fig 2.3.3 Fault on negative busbar
Drawings of current clamp in these two circuit diagrams are for your reference only. We will explain for
their operation in detail in coming context.
Note:
If there is no conductor in busbar to connect the testing clip for signal injection, you are suggested
to use the red puncture clip to pierce the insulated cable.
2.4 Set Generator Output Signal
2.4.1 Measurement of Circuit
After the signal generator is well connected with the DC circuit, please turn on the unit, you will see the
main screen as Fig 2.4.1.1. Use arrow key to highlight “Ground Fault” and press ENT to select it. You
will go to the next screen for output signal setting like Fig 2.4.1.2.
Fig 2.4.1.1 Fig 2.4.1.2
You will need to set the output voltage and output current. Their setting will be:

Output Voltage
:
Optional among 24V, 48V, 110V, 220V, 500V and 1000V. Generally the selected output voltage
should be same or one level higher than system voltage. For example, if it is DC110V substation,
then please select 110V or 220V as output voltage.

Output Current limit
:
Has options of “5mA” and “UL” (unlimited).
Current limit of 5mA means that the signal generator will output a signal with maximal current of
5mA. Based on different circuit signals, output current will be adjusted automatically up to 5mA.
In the condition of “UL”, it will be based on limited output power (5w) with maximal output current
of 30mA.