Without　any　field　concentrate　equipment,　a　novel　current　transducer　based　only　on　solid-state　magnetic　sensor　array　has　been　explored　recently　in　the　field　of　power　system　high　current　measurement.　Aiming　at　reconstructing　the　transient　current　faster　without　sacrificing　the　measurement　accuracy,　an　advanced　measurement　model　in　time　domain,　based　on　the　trans-impedance　at　50　Hz　is　proposed.　In　this　model,　the　dynamic　behavior　of　the　magnetic　field　in　the　measurement　range　is　investigated.　The　optimal　region　for　locating　the　sensors　in　a　three-phase　rectangular　bus-bar　testing　system　is　calculated,　where　the　measurement　model　complies　with　the　measurement　specification.　Theoretical　error　analysis　is　carried　out　with　the　help　of　numerical　and　experimental　results　and　the　final　results　validate　the　effectiveness　of　the　theory　proposed.　©　2011　State　Grid　Electric　Power　Research　Institute　Press.