Digital Signal Processing Reference
In-Depth Information
Fig. 4.
3-D temperature field of the core part and their profile
3.4
Results and Analysis
Fig3 and Fig4 present magnetic field of the transformer core and windings and the
temperature field distribution respectively. It can be seen from Fig 3: the distribution
of the magnetic field in the core is not uniform; the magnetic flux density at the
middle region of core and the high voltage windings is relatively large. The maximum
of the magnetic flux density is at the middle of the core surface and minimum at the
top and bottom of the core. From Fig 4 one can know that the highest temperature
region is at the middle surface of the core, which is 80 ºC, while the lowest
temperature region is at the top and bottom of the core, which is 40 ºC. This is similar
to the simulation results of magnetic flux density shown in Fig3. This can be
attributed to the flux density in the core middle region is relatively large, leading to
the loss increase in the high frequency case, therefore, the temperature reached the
highest value; on the other hand, the heat dissipation effect is better at top and bottom
of the core column, thus the temperature are lower.
4
Conclusions
The internal temperature rise of the transformer will affect the operation of the
equipment directly. In this paper, the ANSYS finite element software was used to
simulate the magnetic field and temperature field distribution of the SC8-1000/10
power transformer. The simulation results show that: (1) the magnetic flux density at
the middle region of core and the high voltage windings is relatively large; (2) the
highest temperature region is at the middle surface of the core, while the lowest
temperature region is at the top and bottom of the core; (3) the flux density in the core
middle region leading to the loss increase in the high frequency case, therefore, the
temperature reached the highest value; the heat dissipation effect is better at top and
bottom of the core column, thus the temperature are lower. Moreover, it can be used
for the magnetic field and thermal field distribution analysis of equipment which has
been running in order to improve the transformer's operational reliability and to
extend the service lifetime. Also, the analysis method can locate the transformer's hot
spots so as to provide a theoretical basis to determine the fiber or thermocouple sensor
embedded point.
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