Procedures for Testing with the DX Host
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85
Partial Discharge Testing–Three-phase Coil Mode
PD testing follows a similar procedure to Surge testing. If you are not already there, ensure that
the tester is in Surge testing mode.
1.
For this example, touch the
Standalone Unit
icon then the
Coil Mode Selection
icon
in the
Mode Submenu.
2.
From the
Popup Menu,
select the
Three-phase coil mode
icon.
3.
The
Lead Selection
icons default to coil 1 to start the test.
4.
Touch the
Enable PD
icon on the right side of the screen. This activates the detector
circuit and tells the tester to display PD data on the surge graph.
NOTE: When
Enable PD
is pressed the first time, the screen will not update to PD specific fields. This
happens when the
PTT
button is first pressed after enabling the feature.
Figure 93. Enabling PD testing adds elements to the start screen.
The
PD event threshold
field (PD threshold [mV] set in the
User Settings
screen) shows the
voltage level of the PD signal detected— value displayed in millivolts.
The
PD events detected / PD number of events
field shows the number of PD events that
exceeded the PD number of events value (PD # events set in the
User Settings
screen). When the
PD events detected value exceeds the PD number of events value, a red PD indicator will appear
just outside the left edge of the X axis, indicating that a PD pulse has occurred.
The
PD signal samples per display pixel
field shows the number of PD signal samples
gathered per display pixel and indicates the resolution of the displayed PD waveform. The PD
measurement system is approximately five times faster than the surge measurement system, so
more PD signals are measured within a surge than can actually be displayed. The measurement
is faster because PD detection is measuring higher frequency information.
5.
Hold down the PTT button and use the
Voltage Output Control
knob to ramp up the
voltage slowly and evenly.
6.
Touch the
Fast Ramp Rate
icon to ramp at the higher rate if desired, but ensure that
ramping is slow enough to allow observation of PD events as described above.
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Страница 58: ...Setting up the Baker DX Tester 48 Baker DX 71 030 User Guide EN V10 www megger com...
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