10
5. For the transformer with neutral point, such as YN-d-11 transformer, according to
YN-d-11 measurement and Y-d-11 measurement, the results have deviation, theoretical
analysis by Y-d-11 better.
6.On load tap changer 19 files of the transformer, if 9, 10, 11 is the same value, the
instrument input and sub type should be input 9.
7.The tap changer is in the low voltage side of the transformer,which display split position
and actual position inversion.
8.Low voltage level of the transformer, when the input voltage value is not enough, the
high and low voltage can be multiplied by 10 or 100, and so on.
9.To test the Single phase transformer,Simply select the measurement option "Single".
VIII: Instrument Common Problems And Inspection
Methods
When the test is abnormal, the following methods can be used for self-test, and the wiring
is shown in the figure below:
After connecting the wire, select y-y-0 or d-d-0 as the connection mode, and press ok to
start the measurement. The measurement value is 1.0000. The above display indicates
