Electromagnetic-thermal coupled analysis of optical current transducer with magnetic concentrator

Magnetic field distribution of optical current transducer (OCT) is affected by temperature, so it's necessary to establish the electromagnetic-thermal coupled simulation model. Based on the analysis of thermal effects on hysteresis loop and air gap length, a three dimensional finite element method model of OCT with magnetic concentrator was built. After several iterative solution process such as electromagnetic field-thermal field-hysteresis loop-air gap length, the electromagnetic-thermal coupled simulation when measuring direct current was achieved. The relationship between temperature rise, magnetic field intensity, environment temperature and current was determined. A new design of air gapped amorphous core with stable temperature characteristics was proposed based on simulation results. Experimental results show that the electromagnetic-thermal coupled simulation method and the design with stable temperature characteristics are useful.