Differential Protection of Transmission Line Based on Identity Fault Charge
This paper proposes a new differential protection criterion based on identity fault charge.Firstly,based on the concept of differential fault charge and restraining fault charge,the fault charge differential protection criterion is formulated.Secondly,the criterion's shortcomings are analyzed and the corresponding optimization strategies and relay setting rules are proposed,which further improves the protection performance.The paper also discusses the idea of avoiding the influence of anti-TA saturation,capacitive current,unloaded switching.Finally,the results of 500kV simulation system by PSCAD show that the protection criterion can identify the internal faults quickly(3-9ms) and accurately,and lockout protection reliably in the external faults.
fault chargeidentity principledifferential protectionfault component current
NETL
NSTL
万方数据
维普
