Unitronics electric UM2B, User Manual

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5.- SOFTWARE DESCRIPTION
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5.3.2.- Transformer technical data
This screen (Figure 5-11) is used to input the technical data on the transformer to be
tested. The upper part of the screen shows the name of the file in which the test is to be
stored, along with the data identifying the transformer and input from the previous screen.
All of these appear on a yellow background, which indicates that they are purely for
informative purposes, and cannot be modified.
- TYPE:
Class of transformer used. This appears on the nameplate.
- Transformer/Autotransformer:
This indicates whether the unit is a transformer or an autotransformer.
- No Tertiary/Tertiary:
This indicates whether the transformer has or does not have a tertiary
winding.
- Single Phase/Three-phase:
This indicates whether the transformer is single phase or three-phase.
- Y. OF MANUFACTURING:
Year in which the transformer was manufactured.
- COOLING:
Type of transformer cooling. This may be by oil or dry.
- POWER (MVA):
Maximum power of the transformer in millions of volt-amperes.
- NOMINAL Vdc:
Nominal short-circuit voltage in percentage terms. This is the percentage of
the rated voltage that needs to be applied to the
high voltage winding for the
nominal current to circulate through the low voltage winding when the latter
is shorted. This is shown on the nameplate.
- CONNECTION GROUP:
This is the winding connection group for three-phase transformers. By
clicking on the indicator a list of the existing possibilities is shown. For
groups in which „N/n‟ appears, one of the windings has an accessible neutral: