Research of HVAC Novel Fault Current Limiter Electromagnetic Field Coupling Considering the DC Component of Short Circuit Current

In high voltage AC transmission system, the DC component of fault current (CDCC) in short circuit will cause great harm to power equipment. To solve this problem, a CDCC energy drain type fault current limiter (CEDFCL) is proposed, which can limit the short circuit current with CDCC. Firstly, the generation mechanism of CDCC in HVAC system and the electromagnetic circuit working mechanism of CEDFCL are analyzed. The field-circuit coupling model of CEDFCL in HVAC system is established. A 500kV current limiting model is built by finite element analysis (FEA) to explore the validity and rationality of CEDFCL structure. Finally, a lab-size prototype is built, a test platform is established and the prototype test is carried out. The simulation and experiment confirmed the validity of the CEDFCL.