7
Figure 6 Exterior Connection Δ Wiring
Transformer with Balance Winding
The transformer with balance winding must be ungrounded in test, as shown in Figure 7.
Figure 7 Wiring of Balance Winding
4.System Test
4.1 Start of “SFRA test” Program
1) Double click the icon
of “SFRA test” to start the program of “transformer winding
deformation test system”.
2) Enter the main program interface titled “Sweep Frequency Response Analyzer” after
the start process (double click the small icon
at the top left corner of the screen to
switch to the desktop. Please do not click the icon in the process of test.)
The software main interface consists of 7 parts:
(
A
)
Test Curve Display Area
The area displays test curve with frequency as X-coordinate and dB value with
Y-coordinate (amplitude-frequency test) or angle value (phase-frequency test). The label
below consists of:
Curve type label: to mark the current display is “amplitude-frequency curve” or
“phase-frequency curve”. Click the label to switch between the two types (require
hardware support).
Sweep mode label: to display the current sweeping mode is linear sweeping or logarithmic