Abstract
The magnetic properties of power transformer core are dependent on the joint type, the magnetic material, the machining, and assembly technology level. The “two-core method” is proposed by the authors to determine the magnetic properties in the joint area and the middle uniform area, for which two product-level core models of the same material (27ZH100) and the same joint type but different lengths of magnetic path are specially designed and manufactured. The total exciting power and loss of the two-core models are measured separately, and then the exciting power and the specific total loss of the joint area and the middle uniform area of the core can be calculated based on the measurement results and the design parameters of the core. Each of the models is assembled entirely in accordance with the standard manufacturing technology of the power transformer core and is actually one-staged lamination of the multi-stage laminated core, which can be used to study the magnetic properties of the actual transformer core, such as the B–H curve, the specific total loss curve, especially the magnetic property curve under oversaturation, as well as the building factor and the difference in magnetic properties between laminated core and single sheet of material. Considering the temperature rise occurred during the operation of a transformer, the experimental study on oriented silicon steel material and core model at different ambient temperatures is carried out, which provides a reference for power transformer simulation and further design optimization. In addition, the influence of stress-relief annealing on the electromagnetic properties of the ring core is also studied.
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Acknowledgements
The experimental research was completed by Lanrong LIU, Yana FAN, Yang LIU, Zhigang ZHAO, Junjie ZHANG, Fulai CHE, Chen CHANG, Meilin LU, Guisheng HAN, Yong DU, and Xian ZHANG under the guidance of Zhiguang CHENG and Qifan HU and with the support of the leaders and colleagues of the relevant departments of Baobian Electric and Tebian Electric. The research project was supported in part by State Grid Corporation of China (no. sgri-wd-71-13-002).
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Appendix 9.1: Magnetic Property Curves of the Ring Core Before and After Annealing
Appendix 9.1: Magnetic Property Curves of the Ring Core Before and After Annealing
The magnetic properties of ring core models 1# and 2# measured before annealing are listed in Tables 9.22 and 9.23, respectively.
The magnetic properties of ring core models 1# and 2# after annealing are listed in Tables 9.24 and 9.25, respectively.
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Liu, T. (2020). Electromagnetic Property Modeling Based on Product-Level Core Models. In: Cheng, Z., Takahashi, N., Forghani, B. (eds) Modeling and Application of Electromagnetic and Thermal Field in Electrical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-0173-9_9
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DOI: https://doi.org/10.1007/978-981-15-0173-9_9
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