Research on excitation scheme for high temperature superconducting coil for power applications
Due to inductance and characteristic resistance,theno-insulated high-temperature superconducting magnet coils will experience excitation delay and inter turn loss during current excitation.On the basis of the traditional NI HTS coil e-quivalent circuit model,this paper considered the influence of joint resistance on large magnet coils and proposed an improved lumped parameter equivalent circuit model.Taking the large NI HTS magnet coil as the research object,the distribution of cir-cumferential and radial currents in the magnet coils under different power supply flow rates was simulated and analyzed.It was concluded that reducing excitation speed can effectively suppress excitation delay and reduce inter turn losses.On this basis,an innovative stepped excitation scheme was proposed.It is found a linear positive correlation between step height and inter turn loss.When the current step height is one tenth of the target current,the inter turn loss can be reduced by about 90％compared to direct excitation at the same current flow rate.
NI HTSEquivalent circuit modelJoint resistanceExcitation scheme
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