Equivalent circuit parameter identification and aging assessment for oil-paper insulation
LI An-n · Dianli kexue yu jishu xuebao · 2014
The time domain dielectric response based recovery voltage method(RVM)is an approach of non-destructive measurement for power transformer diagnosing insulation with applied voltage.Complex polarization process of oil-paper insulation system was analyzed by dielectric response equivalent circuit based on extended Debye model in this paper,and then the mathematical description of the equation of RVM spectrum was derived.The model parameters were calculated by the easy getting RVM spectrum.With the flexible local and global search ability of Interval Adaptive Swarm Optimization Algorithm,the optimal solution was quickly found.Simulation results verified this algorithm superiority and the effectiveness in parameter calculation.Finally, the influences of parameter on the recovery voltage in different states of insulation were analyzed and an effective way to diagnose transformer's insulation was proposed.