CP TD1 User Manual
56 OMICRON
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 low-voltage output. Only one measurement
is made of the winding to tank and core. All high-voltage and low-voltage terminals are connected
together as they are building the high-voltage electrode of the capacity.
5.8 Reactors
Similar to the auto-transformers, reactors also normally have only one winding. Often the low-voltage
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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