非均绕等安匝法试验下电流互感器铁心磁场的研究

为更好揭示以非均绕等安匝法测试电流互感器误差的原理,用有限元法计算分析了电流互感器的三维非工作磁场、铁心中合成磁场的分布及其随一次绕组在铁心上缠绕角度改变的变化特征.研究表明,电流互感器铁心中因外部电流、短路故障等环境影响产生的杂散磁场,完全可能通过改变一次绕组在铁心圆周上缠绕角度得到的相应磁场加以模拟.

Research on magnetic field of current transformer under non uniformly-distributed equal Ampere-turns test

The non uniformly-distributed equal ampere-turns test,which concentrates the primary turns on one part of the current transformer's core,was presented to measure the error of current transformer in actual working environment.However,there's few or no special research on this method of test at home and abroad up to now.In this paper,3D non-working magnetic field and resultant magnetic field of current transformer's core under non uniformly-distributed equal ampere-turns test are solved with 3D finite element method to reveal the principle of this method of test.The trends of these magnetic fields about primary turns' concentrated angle on current transformer's core are also analyzed.It has indicated that the magnetic field of current transformer's core caused from the change of primary turns' concentrated angle on the core could simulate the stray magnetic field of the core caused from the external currents and short circuit fault.