Bridge arm reactor is widely used in voltage sourced converter based HVDC transmission projects, whose temperature distribution is the critical factor determining its operating life. However, the prevailing methods cannot effectively address the pending problem of excessive hot‐spot temperature. In this paper, a radial layered structure is proposed, and each encapsulation is layered according to the ‘Huke curve’, reducing the overall temperature rise and metal consumption of the reactor significantly. Further, a combined‐constraints‐based optimization (CCBO) methodology is proposed with combined advantages of the isothermal rise method and the equal resistance voltage method. A joint solution model for the electrothermal parameters of multiple encapsulations is established. The optimal parameters combination is obtained through iterations, and the temperature rise distribution tends to be balanced. The calculation example for an 800‐kV bridge arm reactor with the radial layered structure shows that the hot spot temperature rise is 33.9% lower than that of the traditional structure, and the metal consumption decreases by 61.5%. Through the CCBO methodology, the temperature difference among encapsulations reduces by 12.5% in comparison with the isothermal rise method. From this work, encapsulations’ temperature rise distribution and their metal consumption become balanced and less, which will improve the reactors’ operation reliability.
In order to simplify the research method of the spatial magnetic field distribution (SMFD) of dry air-core reactors (DARs) in the case of inter-turn short circuit fault, the concept of simplified scaling model was put forward, and the optimal simplified scaling model for different inter-turn short circuit fault was calculated by using the least square method. Firstly, in order to simplify the calculation, 7 typical directions describing the SMFD of DARs were determined based on the similarity degree of magnetic induction intensity in each direction. Then, the simplified scaling model parameters corresponding to different short circuit positions and degrees were studied, and the variation rule was described by using the method of fitting function. Finally, the original model and the simplified scaling model of the DARs in the case of inter-turn short circuit were established respectively in the laboratory. The results show that the optimal structure relative height obtained by experiment is 30% and 20% respectively, which is the closest to the parameters obtained by computer simulation, i.e. ,28% and 20.3%.INDEX TERMS Dry-type air-core reactor (DAR), inter-turn short circuit fault, spatial magnetic field distribution (SMFD), five-loop simplified scaling model, optimal structure.
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