Traditional　current　transformers　(CTs)　suffer　from　DC　and　AC　saturation　and　remanent　magnetization　in　many　industrial　applications.　Moreover,　the　drawbacks　of　traditional　CTs,　such　as　closed　iron　cores,　bulky　volume,　and　heavy　weight,　further　limit　the　development　of　an　intelligent　power　protection　system.　In　order　to　compensate　for　these　drawbacks,　we　proposed　a　novel　current　measurement　method　by　using　Hall　sensors,　which　is　called　the　Hall-effect　current　transformer　(HCT).　The　existing　commercial　Hall　sensors　are　electronic　components,　so　the　reliability　of　the　HCT　is　normally　worse　than　that　of　the　traditional　CT.　Therefore,　our　study　proposes　a　redundancy　mechanism　for　the　HCT　to　strengthen　its　reliability.　With　multiple　sensor　modules,　the　method　has　the　ability　to　improve　the　accuracy　of　the　HCT　as　well.　Additionally,　the　proposed　redundancy　mechanism　monitoring　system　provides　a　condition-based　maintenance　for　the　HCT.　We　verify　our　method　with　both　simulations　and　an　experimental　test.　The　results　demonstrate　that　the　proposed　HCT　with　a　redundancy　mechanism　can　almost　achieve　Class　0.2　for　measuring　CTs　according　to　IEC　Standard　60044-8.　©　2017　by　the　authors.　Licensee　MDPI.