The Calculation of Rotor Temperature Field for Hydro-generator as Well as the Analysis on Relevant Factors

Li, Weili; Ding, Shuye; Zhou, Feng; Luo, Yingli

doi:10.1109/cefc-06.2006.1633245

Cited by 14 publications

(6 citation statements)

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“…The repair of a generator with shorted winding insulation is quite expensive, if it is even possible. To prevent the winding insulation from breaking down as a result of overheating, it is necessary to limit the temperature of the windings [11]- [14]. The additional losses of the generator end can cause local overheating in the end parts.…”

Section: Thermal Calculation and Analysismentioning

confidence: 99%

Calculation of a Complex 3-D Model of a Turbogenerator With End Region Regarding Electrical Losses, Cooling, and Heating

Guan

Zheng

2011

IEEE Trans. Energy Convers.

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A significant problem of turbogenerators on complex end structures is overheating of local parts caused by end losses and complex fluid flow in the end region. Therefore, it is important to investigate the 3-D flow and heat transfer process in the end. Using a 200-MW air-cooled turbogenerator as an example, the influences of end cores and the actual shapes and material of the end coils, press finger, press plate, and copper shield are considered for the end field calculation; then, the physical and mathematical models of the coil end with involute portions are created. The 3-D electromagnetic field was calculated and the losses of different parts in the end and its distribution were obtained. Based on this, the losses from magnetic field calculations will be applied to the end as heat sources in the temperature field. For symmetry of the ventilated structure, the fluid and thermal physical models of the generator within the half-axial section were determined. A set of equations of fluid flow and heat transfer were derived from the fluid-solid conjugated heat transfer and the fluid and temperature distributions were obtained after solving the equations. All of the aforementioned will provide a theoretical basis for the generator safe operation.

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Section: Thermal Calculation and Analysismentioning

confidence: 99%

Calculation of a Complex 3-D Model of a Turbogenerator With End Region Regarding Electrical Losses, Cooling, and Heating

Guan

Zheng

2011

IEEE Trans. Energy Convers.

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“…In contrast, for the numerical analysis of the temperatures of electric machinery, the introduction of the finite-element method (FEM) into the analysis of the temperature field of the turbo-generator by Armor [12] has significantly improved numerical calculations. The FEM and the finite-volume method (FVM) have undergone rapid development and are widely used in the thermal analysis of electric machinery, allowing relatively comprehensive and accurate calculation results to be obtained [12][13][14][15][16][17][18][19]. Nonetheless, due to the inherent defects of the above numerical analysis methods, such as their dependence on computing hardware resources and large volumes of computing data, it is difficult to substantially improve the solution efficiency over long time periods.…”

Section: Introductionmentioning

confidence: 99%

Analysis of magnetic pole loss and heat in a tubular hydro‐generator based on 3D electromagnetic field–thermal network modelling

Xie

Zhou

et al. 2023

IET Electric Power Appl

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In order to more accurately and efficiently determine the loss and heating state of the magnetic pole area of a tubular hydro-generator, this study establishes a comprehensive 3D electromagnetic field-thermal network analysis model of its pole area and implements calculations according to its rated symmetrical operating conditions. A 36 MW large tubular hydro-generator is used as an example. Based on the measured results of the pole temperature and the use of the calculation hardware, the results are compared with the traditional electric circuit-magnetic circuit-thermal circuit method and 3D electromagnetic field-temperature field finite-element method. It is shown that the 3D electromagnetic field-thermal network model established in this study has several advantages, including high calculation accuracy, short calculation time, and low hardware consumption. These results have important value in improving the electromagnetic-temperature analysis and design of poles in large hydro-generators.

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“…Three-dimensional FEM computations are used by Weili et al for studying local stator core temperature rises [9] and rotor temperature rises [10] of large synchronous machines.…”

Section: Introductionmentioning

confidence: 99%

Cooling Airflow, Losses, and Temperatures in Large Air-Cooled Synchronous Machines

Traxler-Samek

Zickermann

Schwery

2010

IEEE Trans. Ind. Electron.

132

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At steady-state operation, power losses cause a heating of rotating electrical machines. In air-cooled machines, these losses are evacuated by a forced cooling airflow through the active parts. When designing and optimizing such a machine, the design engineer must be able to get a full picture of the power losses, the cooling airflow, and the temperatures inside the active parts (e.g., core laminations, windings) and the periphery (e.g., winding overhangs). The aim of the designer is to fulfill the customer's requirements regarding the guaranteed temperatures. This paper presents a computation method, where the power loss, airflow, and temperature calculations for the world's largest air-cooled hydrogenerators are coupled in an iterative process. The new contribution of this paper is a calculation software developed by the authors. It includes a state-of-the-art loss computation, an automated airflow network, and a set of linked thermal networks. These computations result in a complete overview of the temperature gradients and allow fine tuning of the cooling airflow and, consequently, optimization of ventilation losses.

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The Calculation of Rotor Temperature Field for Hydro-generator as Well as the Analysis on Relevant Factors

Cited by 14 publications

References 0 publications

Calculation of a Complex 3-D Model of a Turbogenerator With End Region Regarding Electrical Losses, Cooling, and Heating

Calculation of a Complex 3-D Model of a Turbogenerator With End Region Regarding Electrical Losses, Cooling, and Heating

Analysis of magnetic pole loss and heat in a tubular hydro‐generator based on 3D electromagnetic field–thermal network modelling

Cooling Airflow, Losses, and Temperatures in Large Air-Cooled Synchronous Machines

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