T-305E User Manual Version 3.5 | 12
1.
HV Voltmeter: Shows the magnitude of the high voltage output. The analogue meter
allows the voltage fluctuations to be observed during discharge.
2.
Ammeter: Indicates the leakage current during insulation testing.
3.
Grounding alarm: Provides a red indication when the protective ground is not properly
connected. When the alarm is activated, the HV circuit will also be disabled.
4.
Stop: Pressing this button will open the HV circuit. The red “start” indication will be
switch off and
the green “stop” indication will
turn on.
5.
Power switch: The key prevents the unit being turned on when the by unauthorised
personnel.
6.
Timer: The timer sets the cyclic discharge from 4
–
15.
7.
Start: Pressing this button will close the HV circuit. The internal discharge switch will
operate. The red
“start” indica
tion will be on and the
green “stop” indication will be off
.
8.
Mode
–
Allows the selection of DC, pulse or cyclic modes of operation.
9.
Surge
–
When the pulse mode is selected, pressing this button will produce a single
surge pulse in to the cable under test.
10.
Capacitor bank switch
–
Consists of three capacitor bank settings, selectable for
different cable types and different fault types (note the capacitance values vary
between the 1024J and 2048J versions).
11.
Test Voltage Control
–
Has a zero voltage interlocking during power-up. Before power-
up, the voltage must be adjusted to zero, otherwise the HV circuit cannot start.
12.
Test method switch: To switch between two test methods: Impulse current method
(ICM) and Secondary/Multiple impulse method (SIM/MIM).
13.
Emergency Stop: In an emergency situation, pressing this button will cut off the power
supply and automatically discharge any residual charge.
Figure 4.3 1024J T-305E Front panel
