OMICRON 51
Power transformers
Figure 5-22: Frequency scan for H-L (f) (5 kV)
5.6.2 Measurements on a three-winding transformer with
TESTRANO 600
For a detailed description of the Tan Delta measurement with TESTRANO 600 refer to the
TESTRANO 600 User Manual under section "TouchControl tests" and its sub-section "Tan Delta".
5.7 Auto-Transformer
The auto-transformer has only one winding with a tap for the LV-output. Only one measurement is made
of the winding to tank and core. All HV-terminals and LV-terminals are connected together to form a
single HV-electrode.
5.8 Reactors
Similar to the auto-transformers, reactors also normally have only one winding. Often the LV-ends of the
three phases are connected outside the tank to the Neutral. In this case there are 2 bushings per phase,
which have to be connected for the DF test. All combinations can be measured: Phase to phase and
phase to tank (ground).
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