Transformer Temperature Rise Test | Heat Run Test on Three Phase Transformer | Raytech Meter

Описание: #TransformerTemperatureRiseTest
#HeatRunTest
#RaytechResistanceMeter

Topic: Transformer Temperature Rise Test
: Heat Run Test on Three Phase Transformer
: Raytech Meter

Reference Clause from IEC-60076-2

7.2.1 Ambient temperature

1- For the temperature rise test, the cooling air temperature should be in the range between
10 °C and the maximum ambient temperature for which the transformer is designed.

2- At least four sensors shall be provided and the average of their readings shall be used to determine the ambient temperature for the evaluation of the test results.

3-Readings should be taken at regular intervals (e.g. every ten minutes), or automatic
Continuous recording may be used.

4-Around an ONAN transformer, the ambient sensors shall be placed at a level about halfway
Up the cooling surfaces.

5-The sensors shall be distributed around the tank, about 2 m away from the perimeter of the tank
And cooling surfaces, and protected from direct heat radiation.

6-Attention shall be paid to possible recirculation of hot air. The transformer should be placed
So as to minimize obstructions to the airflow and to provide stable ambient conditions.

7.3.2 Test short-circuit method for two winding transformers
During this test, the transformer is not subjected to rated voltage and rated current
simultaneously, but to the calculated total losses, previously obtained From two separate
determinations of losses, namely load loss at the reference temperature and no-load loss (see
IEC 60076-1).