Tettex 2293 - Measuring Sequences; Example 1

Theory
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3.3 Measuring sequences
This section describes how the device selects the measuring mode depending on the user
settings done in the user software. The coloring of the drawings is equivalent to the user software:
- Violet Phase to be measured
- Red Phase currently measuring
- Blue Phase already measured
- Grey Nothing measured nor to be measured
General Rules
1. If the measuring current selected on any winding is greater than 16.0A, a single winding
measurement will be performed for each winding and phase  Mode A2, B2.
2. Mode C is used only when the two corresponding phases on HV and LV are selected to
be measured and the current is less or equal 16.0A.
3. Mode D is used only when the two corresponding phases on HV and LV are selected to
be measured, the DUT is an YNd transformer and the current is less or equal 16.0A. YNd
measuring mode must be set to “without Rn (Ph-Ph)”:
The following examples show the measuring sequence generated by the 2293 depending on the
measurement settings. For simplicity an YNyn0 transformer was chosen as DUT in most
examples.
3.3.1 Example 1
Settings:
16A
A
B
C
N
16A
A
B
C
N
A
B
C
N
16A
a
b
c
n
16A
a
b
c
n
a
b
c
n
YNyn0
Sequence:
16A
50V
16A
50V
16A
50V
16A
50V
C