CP SB1 User Manual
48
3.5.1 Test Settings for the Winding Resistance
Navigate to the parameter fields, and enter the values according to your test
requirements:
Range: Output range
Itest: Nominal test current
Wiring: • D, Y, YN: for measurements on the
high-voltage side
• d, y, yn, z, zn: for measurements
on the low-voltage side
The measurement is performed where
the tap changer is mounted.
• manual: manual wiring to the
CP SB1 for special measurements
Note: If the winding connections YN,
yn, zn are selected, the measured
resistance is always from phase to
neutral. Otherwise, the measurement
is between the phases.
Tmeas: Actual specimen temperature
Tref: This is the reference temperature at
which the manufacturer measured the
taps’ winding resistance values.
Generally, this value should be
specified in the transformer’s data
sheet.
The winding resistance value at this
temperature always represents the
nominal resistance value. The
resistance correction is only valid for
copper as winding material.
Auto-tap: Automated tap operation mode for
performing automatic tap switches
Tap time: Time needed to switch from one ta to
the next
Start at: Starts the measurement at the lowest
or highest position of the tap
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General