Transformer magnetizing inrush current can lead
false-actions of differential protection and, reduce transformer
lifetime, and send higher harmonics to power grid. The paper
deals with the harmful problem of magnetizing inrush current
for switch-on unloaded transformer. We derive the
mathematical model of magnetizing inrush current. Based the
analysis of relation among magnetizing inrush current,
residual magnetism, switch angle, magnetizing impedance, the
current interrupting angle and its magnitude, we presents the
approach of reduction the magnetizing inrush current. By
properly control the voltage initial angle for switch-on break,
the primary winding current go into steady without transition.
Simulation results indicate the validity and feasibility of the
proposed algorithm. It is necessary to popularize the proposed
approach in switch-on unload transformer.
Transformer magnetizing inrush current can leadfalse-actions of differential protection and, reduce transformerlifetime, and send higher harmonics to power grid. The paperdeals with the harmful problem of magnetizing inrush currentfor switch-on unloaded transformer. We derive themathematical model of magnetizing inrush current. Based theanalysis of relation among magnetizing inrush current,residual magnetism, switch angle, magnetizing impedance, thecurrent interrupting angle and its magnitude, we presents theapproach of reduction the magnetizing inrush current. Byproperly control the voltage initial angle for switch-on break,the primary winding current go into steady without transition.Simulation results indicate the validity and feasibility of theproposed algorithm. It is necessary to popularize the proposedapproach in switch-on unload transformer.
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