The main features of the apparatus are focus on small volume , light weight , no iron core , no magnetic saturation and no ferreous resonance , moreover , related advantages such as the large range of transient and frequency response , excellent electrical magnetic compatibility , oil - free configuration , reliable insulation structure , are all the trends of current transformer in the future . meanwhile , it should agree with the future power gauge and digital , computer , automatic relay protection . it will meet the demand of digital power network 它具有体积小、重量轻；无铁芯、不存在磁饱和与铁磁谐振问题；动态响应范围大，频率响应宽；抗电磁干扰性能强；无油化结构、绝缘可靠、价格低等优点；是未来电流互感器发展的方向，是新一代电力数字网发展的需要，适应电力计量和保护数字化、微机化和自动化发展的潮流。
2.
For obtaining the numeral solutions of round elastic plates in axisymmetrical deformation with varying - thickness in nonlinear deformation in the unsteady electromagnetic field and mechanical field , by establishing the equations of motion , the equations of distortion , the equations of lorentz force , the equations of electronic dynamic mechenical , and adopting iterative method , we gained the nonlinear magneto - elastic calculation method and outcome of current - carrying shell , and gained the influencing degree toward mechanical parameter of varying thickness round ferreous plates in the electromagnetic field and mechanical field 摘要为了获得内边界固定的环形导电薄板在均布力与横向磁场作用下的变形问题的数值解，通过建立运动方程、变形方程、电动力学方程和洛仑兹力方程，运用迭代法得出了载流板壳的非线性磁弹性的计算方法和结果，以及机械场、电磁场对铁质变厚度圆板各力学参量的影响程度。
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