Advanced calculation of temperature rises in large air-cooled hydro-generators

Traxler-Samek, G.; Zickermann, R.; Schwery, A.

doi:10.1109/icelmach.2008.4799974

Cited by 9 publications

(4 citation statements)

References 8 publications

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“…The axial heat flow between the bar copper inside the stator core and in the end region is not considered. In this paper, the overall temperature distribution in the active parts of the machine is computed with three different thermal networks [14]. 8 shows that seven networks of type (a) are coupled with an axial network of type (b); the pole network type (c) is separately computed.…”

Section: Thermal Computationmentioning

confidence: 99%

“…The calculation includes the stator core with its end zones, the whole stator winding (active part and winding overhang), and the rotor winding. The new contribution of this paper is a fully integrated iterative coupling of a detailed airflow network of the whole machine with a state-of-the-art analytical loss computation and several thermal networks [14]. The presented method is implemented in a calculation software developed by the authors and used to study the world's largest air-cooled hydrogenerators.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Thermal Computationmentioning

confidence: 99%

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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“…Key value is the temperature on isolation-conductor contact, because heat is generated in conductors due to the Joule's losses. 3D finite element model would give temperature distribution on rotor if geometry, materials, and total heat power is known ( [3], [4], [5], [6], [7], [8]). …”

Section: Introductionmentioning

confidence: 99%

Application of IR thermography to mesurements on synchronous hydrogenerator in rotation

Stipetić¹,

Hanić²,

Vražić³

2010

Proceedings of the 2010 International Conference on Quantitative InfraRed Thermography

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Synchronous generator is the most common generator type used in power systems. Modern control and diagnostic systems require information of the excitation winding temperature. This winding is located on the rotor and therefore conventional temperature measurement requires slip-rings or wireless data transfer. IR thermography can be used to obtain average temperature of the surface of excitation winding while rotating and 3D FEM models can give temperature distribution. Laboratory model included synchronous hydro-generator (400 kW), IR thermometer and Bluetooth ® wireless temperature acquisition system with temperature sensors placed on rotor. Two measurement systems were compared and experimental results are presented.

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“…Overall, the heat transfer at the end windings or the flow field inside the stator ducts can barely be computed using thermal networks, while the application of three-dimensional numerical methods makes these predictions possible. CFD offers a good potential to fully predict ventilation and cooling in generators [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. CFD has the advantage that it can be used to predict the flow and heat transfer in complex regions, without case-specific empirical correlations.…”

Section: Introductionmentioning

confidence: 99%

CFD-based Design and Analysis of the Ventilation of an Electric Generator Model, Validated with Experiments

Jamshidi

Nilsson

Chernoray

2015

International Journal of Fluid Machinery and Systems

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The efficiency of the ventilation system is a key point for durable and reliable electric generators. The design of such system requires a detailed understanding of the air flow in the generator. Computational fluid dynamics (CFD) has the potential to resolve the lack of information in this field. The present work analyses the air flow inside a generator model. The model is designed using a CFD-based approach, and manufactured by taking into consideration the experimental and numerical requirements and limitations. The emphasis is on the possibility to accurately predict and experimentally measure the flow distribution inside the stator channels. A major part of the work is focused on the design of an intake and a fan that gives an evenly distributed flow with a high flow rate. The intake also serves as an accurate flowmeter. Experimental results are presented, of the total volume flow rate, the total pressure and velocity distributions. Steadystate CFD simulations are performed using the FOAM-extend CFD toolbox. The simulations are based on the multiple rotating reference frames method. The results from the frozen rotor and mixing plane rotor-stator coupling approaches are compared. It is shown that the fan design provides a sufficient flow rate for the stator channels, which is not the case without the fan or with a previous fan design. The detailed experimental and numerical results show an excellent agreement, proving that the results reliable.

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Advanced calculation of temperature rises in large air-cooled hydro-generators

Cited by 9 publications

References 8 publications

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

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

Application of IR thermography to mesurements on synchronous hydrogenerator in rotation

CFD-based Design and Analysis of the Ventilation of an Electric Generator Model, Validated with Experiments

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