Design And Modeling Of Superconducting Fault Current Limiter For A High Voltage Substation A Case Study Akaki Substation Ii (400kv To 230kv)

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Modern electric power systems are becoming more complex in order to meet high loadrndemand with good quality. So, the increasing amount of on-site generation should bernintegrated into the power grid. This translates to more sophisticated electric network withrnintrinsically high short circuit current capacity. rnA superconducting fault current limiter (SFCL) is proposed as a solution in order to increasernsafety margin of circuit breakers (CBs) by reducing the maximum short-circuit current belowrnthe breaking capacity of the substation. SFCL is a device with negligible impedance underrnnormal operating conditions that immediately switches to a high impedance state in case ofrnover-current. This advantage makes SFCL a key component in this regard. rnAt AkAki II substation, 230 kV bus-bar, a hybrid-resistive SFCL is designed. The designrnprocedure encompasses collection of the substation data, short-circuit analysis of thernsubstation and designing of all parts of the SFCL. The short-circuit analysis is done using ETAPrnsimulation software. Then, a hybrid-resistive SFCL is designed to have a current-limitingresistorrnwithrn143.2rnMWrnratingrnatrn4.111rnkArnandrn8.476rnΩ,rn5.832rncmrnwidthrnandrn721.76rnmrnlengthrnrnofrnselectedrnrn(Yttrium, bismuth, strontium, copper and oxygen)YBCO coated-conductor, fastswitchrninterruptingrn9.35rnkArnwithinrn48rnms,rnandrnarncoolingrnrequiringrn80rnlitersrnofrnliquidrnnitrogenrnrnandrn256rnkWrncondenser.rnThis designed SFCL is modeled using Matlab/Simulink and the result showed that the SFCL canrnminimize the maximum short-circuit current from 44 kA to 35 kA and enables the substationrnto clear the fault without problem. This means that the substation can be integrated tornadditional power coming from a generation having short-circuit rating of 3585 MVA with thernprevious safety margin still. rnTo implement the SFCL system, the whole system components cost $320,000/phase andrnrequire 10m × 20m area by 1.8m height space of the substation.

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Design And Modeling Of Superconducting Fault Current Limiter For A High Voltage Substation  A Case Study Akaki Substation Ii (400kv To 230kv)

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