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SIGA standard design
techniques result in a typical temperature rise of 60°C when
operated at full load and in an ambient of 20°C.
The approximate temperature rise at other loads can be estimated
from the data in graph one. The actual temperature rise will
depend on the general condition under which the transformers
are operated and in particular the ambient temperature, the
amount of ventilation available and the fixing method are important
factors.
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| The regulation of a transformer
- the output voltage drop on load - is calculated as follows: |
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The regulation varies
with the size and VA rating of the transformer, and the typical
regulation of a SIGA 50 Hz toroidal transformer is shown in
graph two. If further technical detail or advice is required
please contact SIGA technical sales department who will be pleased
to assist.
Note:
The technical data is provided in good faith, as a general guide
only, and due to the many factors which can effect its accuracy,
users should satisfy themselves as to the validity of the information
for their particular application.
No responsibility can be accepted by SIGA for any problems caused
by errors in the technical data. When a transformer is used
with a rectifier load, as in power supply applications, the
AC rating of the secondary winding depends upon the DC output
required and the type of rectifier circuit in use. The relationship
between the AC secondary rating and the DC output for some common
circuits is shown below when capacitor smoothing is required.
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| The figures quoted are
an approximate guide only, and for more precise results, account
must be taken of the rectifier forward voltage drop and the
effect of the smoothing capacitor on the current form factor
and ripple voltage. If a voltage regulator is being used, account
must be taken of the regulator dropout voltage. |
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