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The Power density of ECRIS magnet coil is larger than 3000kW/m3, and evaporative cooling technology is an ideal method to achieve the cooling requirement. The two phase flow of evaporative cooling system affects the cooling efficiency of coil. This paper introduces the self-driven evaporative cooling system of magnet, and analyses the pie structure of magnet coil and two phase flow channel in the...
Overload performance of permanent magnet motor is very important for some special occasions, which has been generally limited by temperature rise of stator. This paper introduces a new method based on heat storage of phase change paraffin to enhance the overload performance of motor. The heat variation of motor was analyzed under overload process, and the key affecting factors were given to control...
The 400MW evaporative cooling hydrogenerator in Lijiaxia hydropower station has been serving for more than 15 years. This paper gives a comprehensive evaluation of this unit from cooling mode selection, electrical magnetic scheme design, operating practice and temperature distribution. The application of the evaporative cooling technology to 400MW-grade hydrogenerator shows great advantages comparing...
Radial ventilation channel is a key component of large turbo generator stator, which affects the cooling of stator core and bars. The design of radial ventilation channel need simultaneously consider the flow resistance and cooling capacity. In this paper, the width of radial ventilation channel, the structure and material of support parts will be discussed to improve the cooling capacity of large...
The submerged cryogenic induction (SCI) motor is a key component of a submerged liquefied natural gas (SLNG) pump. In this paper, A lumped-parameter-based thermal analysis applicable to the stator of a 15kW SCI motor for the SLNG pump is presented. The corresponding stator winding losses is calculated based on the thermal analysis result. In order to reduce the stator winding losses, the stator structure...
Converter valve cooling device as the heat exchanger, is known as the converter valve's blood circulation system, Inefficiency of the equipment will not only lead to the component overheating damage, but also serious DC system outage. Therefore, reliable HVDC valve cooling system is essential for the HVDC transmission system. In this article, analysis on the two-phase flow heat transfer characteristics...
Inner evaporative cooling way of stator bars is generally affected by circulating system and coolant. In this paper, we focus those factors to improve the capability of cooling system. Based on the flowing resistance distribution of system, the structure of components is redesigned to improve the stability and reliability of circulating flow. In the same time, different kinds of coolant are used into...
when we design immersing evaporative cooling turbo generator, How to control the temperature rise of stator bars in an appropriate situation is one of the most important parts in the unit designing. In this paper, the heat flowing paths of stator components are analyzed in the immerging stator structure. Based on the heat transfer theories, Numerical simulation model is built for the stator temperature...
In recent years safety accidents of large-scale wind turbine occur frequently. Because of the structure specialization of wind turbine, in case of an accident, the entire unit is often completely destroyed and economic losses will be very high. This paper presents some phased research results on serious wind turbine accidents and put forward appropriate countermeasures for different types of accidents.
Evaporative cooling technology of the generator takes advantage of phase change heat transfer of coolant to take away large quantity of heat, so in the evaporative cooling system the choice of coolant is very important. The Evaporative Cooling technology has experienced three stages of principle innovation, which is related with the coolant. Two kinds of the coolant were used in the experiment to...
As a widely used clean and renewable energy, the wind power has attracted the attention of all nations in the world. The application of evaporative cooling technology in the cooling method of large wind power generator is a new attempt in the discovery of wind power energy. This paper mainly discusses the air cooling condenser with frequency converted axial fan which is adopted in the natural temperature...
With the development of large electrical equipment, more and more cooling technologies are introduced to deal with the large amount of heat produced by the consumption. Close-loop self-circulation (CLSC) evaporative cooling technology is a newly developed technique for the cooling of the large electrical equipment. In certain circumstances, the air-cooling condenser is used as the secondary cooler...
Evaporative cooling technique is successfully applied for large turbo generator following the air-cooled, hydrogen-cooled and water-cooled techniques. Compared with the three techniques, evaporative cooling technique absorbs the heat of thermal parts of generator by vaporization latent heat of coolant, which is sharply more efficient than the specific heat cooling approaches. The temperature rise...
The calculation of large hydrogenerator's magnetic and thermal fields is very complicated due to the complexity of their construction, different properties of their materials and nonlinearity of core B-H curve. Finite Element analysis tools are relatively convenient for solving these problems. In this paper, Ansys software is adopted in analysis of the Three Gorges' 840MVA evaporative cooling hydrogenerator...
In order to solve the cooling problem of the large electrical machine under special situation, the staff of IEECAS brought forward new coolant and cooling structure for spraying evaporative cooling system based on experiences of evaporative cooling electrical machine for many years. The article discusses detailed the key problems include systems structure, theory calculation and experiment. By the...
As a new generator cooling technology, the evaporative cooling technology has been researched on various aspects to a certain extent, such as the two-phase flow pressure drop, temperature distribution and etc. But there has no research reported on the two-phase flow instability in the parallel hollow conductors in the evaporative cooling system. The occurrence of two-phase flow instability phenomena...
In some particular circumstances, the air-cooling condenser must be adopted as the secondary cooler in the evaporative cooling system of large electrical equipments. For the cooling medium in the air-cooling condenser is the air and the distribution of temperature is uneven along the cooling tube, so it's necessary to do deep research on it. Experiments are carried out to study the heat transfer characteristics...
A heat transfer calculation approach of spraying evaporative cooling is presented according to its characters using in large electrical machine. Based on the parameters of coolant, fluid and surface structure the calculation approach is confirmed, and gain the relationship between convective heat transfer coefficient and heat flux. Experiment model of spraying evaporative cooling electrical machine...
Close-loop self-circulating (CLSC) evaporative cooling technology is a newly developed cooling technique in the evolution of large electrical machines and other large electrical equipments. As the driving power of the coolant in the circulating loop of the self-circulating evaporative cooling system is very small, each part of the resistance must be studied thoroughly to minimize them. This paper...
Liquid cooling is an effective method to cool the rotor of turbo generator. Evaporative cooling technology is the frontier field of liquid cooling technology at present. This paper reviews fluid cooling technology for rotor of turbo generator and introduces research progress on open channel evaporative cooling technology.
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