Compact Hybrid-biased Three-phase Saturated Core Fault Current Limiter
Installing a saturated core fault current limiter is an effective method to limit short-circuit current in high-voltage alternating current transmission(HVAC)systems;however,it requires the combination of an external air-core reactor,resulting in a large occupied area and volume for the entire current-limiting system.Therefore,this paper proposes a compact hybrid-biased three-phase saturated core fault current limiter(CTFCL)based on the principle of non-orthogonal decoupling,which has the advantages of small occupied area and volume.Firstly,the topology of CTFCL with non-orthogonal decoupling windings is proposed.Secondly,the equivalent electromagnetic circuit model of CTFCL is established,and its working principle is analyzed.Then,the parameter design guidelines for CTFCL are provided,and a finite element model at 220 kV level is built to verify the current-limiting effect and electromagnetic characteristics of CTFCL.Finally,a small-capacity prototype is designed and developed to conduct the experiments.The simulation and experiment results both demonstrate the effectiveness of the proposed CTFCL.The CTFCL exhibits excellent cur-rent-limiting effects for various short-circuits,and compared to traditional three-phase SCFCL current-limiting system,the occupied area and volume of the CTFCL current-limiting system are,respectively,decreased by 44% and 26%,which makes it suitable for installation and application in practical HVAC systems.
saturated core fault current limiterthree-phase topologycompactnessnon-orthogonal decoupling principleparameter designfinite element analysis
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