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This paper gives a summary of the requirements and calculating methods for the maximum insulated conductor temperatures (usually referred to as hottest-spot temperature or hot spot temperature) in oil-immersed transformers. Laboratory experiments were performed on a 5 kV, 100 kVA transformer using thermocouples during the short circuit heat run tests, and the measurements from the tests are employed...
Thermal behaviors of transformers have a close relationship with the ageing processes of transformer insulation. In oil immersed transformers, feature temperatures such as top-oil temperature and hot spot temperature are recommended to be monitored online. To minimize the risk of failure and to extend the serving life time of transformers, both temperature rises should be controlled within certain...
Oil-immersed transformers are key components in power systems. The inordinate temperature rise in oil-immersed transformers, featured by hot-spot temperature (HST), accelerates thermal degradation in insulation. This phenomenon may result in reduction of service age or thermal breakdowns of transformers. HST is also an important parameter to determine the optimum load ability of transformers. A procedure...
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