The improved thermal-circuit model for hot-spot temperature calculation of oil-immersed power transformers

2016 ◽  
Author(s):  
Wei Ben-gang ◽  
Fu Chen-zhao ◽  
Li Hong-lei ◽  
Li Ke-jun ◽  
Liang Yong-liang
Keyword(s):  
Hot Spot ◽  
Circuit Model ◽  
Power Transformers ◽  
Thermal Circuit ◽  
Temperature Calculation ◽  
Spot Temperature

A Novel Approach to Investigate the Hot-Spot Temperature Rise in Power Transformers

2015 ◽  
Vol 51 (3) ◽  
pp. 1-4 ◽  
Author(s):  
Longnv Li ◽  
Shuangxia Niu ◽  
S. L. Ho ◽  
W. N. Fu ◽  
Yan Li
Keyword(s):  
Temperature Rise ◽  
Hot Spot ◽  
Power Transformers ◽  
Novel Approach ◽  
Spot Temperature

Oil Additives for the Evaluation of Hot Spot Temperature in Power Transformers During Overload Tests

1982 ◽  
Vol EI-17 (5) ◽  
pp. 414-422 ◽  
Author(s):  
M. Duval ◽  
J. Aubin ◽  
Y. Giguere ◽  
G. Pare ◽  
Y. Langhame
Keyword(s):  
Hot Spot ◽  
Power Transformers ◽  
Oil Additives ◽  
Spot Temperature

scholarly journals Effect of Loads on Temperature Distribution Characteristics of Oil-Immersed Transformer Winding

2021 ◽  
Author(s):  
Zhengang Zhao ◽  
Zhangnan Jiang ◽  
Yang Li ◽  
Chuan Li ◽  
Dacheng Zhang
Keyword(s):  
Temperature Distribution ◽  
Hot Spots ◽  
Hot Spot ◽  
Transformer Oil ◽  
Distribution Characteristics ◽  
Thermal Circuit ◽  
Transformer Winding ◽  
Overload Capacity ◽  
The Impact ◽  
Spot Temperature

The temperature of the hot-spots on windings is a crucial factor that can limit the overload capacity of the transformer. Few studies consider the impact of the load on the hot-spot when studying the hot-spot temperature and its location. In this paper, a thermal circuit model based on the thermoelectric analogy method is built to simulate the transformer winding and transformer oil temperature distribution. The hot-spot temperature and its location under different loads are qualitatively analyzed, and the hot-spot location is analyzed and compared to the experimental results. The results show that the hot-spot position on the winding under the rated power appears at 85.88% of the winding height, and the hot-spot position of the winding moves down by 5% in turn at 1.3, 1.48, and 1.73 times the rated power respectively.

Design of a New Oil Spraying Device for Hot Spot Cooling in Large Scale Electric Power Transformers

2008 ◽  
Vol 9 (2) ◽  
Author(s):  
Kourosh Mousavi Takami ◽  
Jafar Mahmoudi
Keyword(s):  
Thermal Management ◽  
Large Scale ◽  
Cooling System ◽  
Hot Spot ◽  
Considerable Effect ◽  
Power Transformers ◽  
Insulation Aging ◽  
Simulation Results ◽  
Spot Cooling ◽  
Spot Temperature

Hot spot temperature (HST) is the most important parameter in the operation of power transformers. The HST has to be held under a prescribed limit. HST has a considerable effect on the insulation aging. Therefore detecting, monitoring and removing the HST could be a very important and necessary action for utilities. A new design of oil spraying and its effect, along with a thermal management in a transformer cooling system has been studied in this paper. The effect of oil fluid flow on the HST problem has been considered in this paper; and the calculations and simulation have been performed by Ants algorithm. The simulation results have been validated based on a 230/63/20 kV, 250MVA transformer at the Sari substation in Iran, and the results indicate that the new design could mitigate the limitations of transformer loading due to the HST problem. The Ants algorithm have been proposed and applied for accomplishing this task and to give an improved level of accuracy.

scholarly journals A Study on the Hot Spot Temperature in 154kV Power Transformers

2012 ◽  
Vol 7 (3) ◽  
pp. 312-319 ◽  
Author(s):  
Dong-Jin Kweon ◽  
Kyo-Sun Koo ◽  
Jung-Wook Woo ◽  
Joo-Sik Kwak
Keyword(s):  
Hot Spot ◽  
Power Transformers ◽  
Spot Temperature
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