Conductor Requirements for Superconducting Fault Current Limiters
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1 superior performance. powerful technology. Conductor Requirements for Superconducting Current Limiters Chuck Weber, Director HTS Applications Coated Conductors in Applications 2008 Houston, Texas - December 4, 2008 SuperPower, Inc. is a subsidiary of Royal Philips Electronics N.V.
2 Current Limiter Functionality Current Normal operation 1 inception condition First cycle Follow current b 3 2 a without FCL First cycle after fault 5 with FCL clearing Recovery a: without FC-interruption b: with FC-interruption t = 0 t a 5 5 time t d t d tr t r U n rated system voltage t a action time (from t = 0 until î max ) t d fault duration time t r recovery time 1: rated current (I n ), peak (î n ) 2: minimum initiating current (î min ) 3: maximum limited current (î max ) 4: peak (prospective) short circuit current (î p ) 5: peak value of the follow current (î fol ) * Courtesy of Johann Jäger, Univ. of Erlangen-Nürnberg Interaction Between Current Limiters and Protection Final Report CIGRE A3.16 Sept 3, 2008 Chair of Electrical Power Systems - University of Erlangen-Nürnberg J. Jäger 2
3 FCLs must work in conjunction with protection systems Key coordination aspects: 1. First cycle response initiation current, action time, limitation ratio 2. Rest of response FC interruption, duration, waveform distortion 3. Recovery response max. fault duration, recovery time, let-thru current current limiter Protection system Coordination is essential AEP transmission line re-closure sequence Breaker opens and locks-out 18 Cycles Load Current 15 sec Load Current 135 sec Load Current 160 sec Load Current Recovery under NO Load Current 2009 International Workshop on Coated Conductors for Applications December 4, 2008
4 Types of Superconducting FCLs Resistive Type SuperPower, AMSC/Siemens, Nexans Utilizes fast quenching of HTS material Internal or external shunting Fail-safe design With or without Recovery Under Load (RUL) Saturated Core Type Zenergy HTS material does not see fault (i.e. doesn t quench) Essentially building a DC coil where amp-turns are key criteria Hybrid Type Korea, China HTS material is removed from circuit after fault is detected Typically doesn t limit prospective current during first peak Many variations of each type are possible 2009 International Workshop on Coated Conductors for Applications December 4, 2008
5 7.362" " 7.362" " SuperPower SFCL program overview Partners 138 kv, 650 kv BIL Bushings Pressure Vessel Vacuum Vessel HTS Tapes Specifications YBCO based, resistive type FCL 138 kv class device Current 13.8 ka Load Current 1,200 A rms Design fault current 37 ka Design device response Recover to superconducting state after a fault carrying full load current Shunt Coil Matrix Assembly Assembly diameter Inner diameter HTS Assembly Height Inner Height 2009 International Workshop on Coated Conductors for Applications December 4, 2008
6 AMSC SuperLimiter TM Basic Specifications Reactor Sized to Limiting Requirements Requirement Prototype System Production Units Nominal Voltage 115kV rms kV Opening Switch Load Insulation Class 138kV 138kV Nominal Current 1,200A >2,000A Source Switch Control Maximum Site Unlimited Current 63kA >80kA FCL Vessel Assembly Site Limited Current 40kA As required by customer Protection and DAQ System Refrigeration System Trip Current 1.6pu As required by customer * Courtesy of Bruce Gamble, AMSC Power Heat AMSC 1 cm wide wire Siemens bifilar coil technology Nexans high voltage terminations
7 * Courtesy of Larry Masur, Zenergy Power 7
8 KEPRI, Plug-in Future Hybrid SFCL Co-developed by KEPCO and LSIS HTS VI HTS VI DC Power fuse DC SB Reactor/Limiter (1) 1 st peak limiting type SB Reactor/Limiter (2) 1 st peak NON- limiting type 1 st peak limiting (Left) and 1 st peak non-limiting (Right) types * Courtesy of Ok-Bae Hyun, KEPRI
9 Wire Requirements for SFCLs Relative Importance of HTS Wire Characteristics Resistive Type w/ RUL Resistive Type w/o RUL Saturated Core Type Hybrid Type Cost Uniformity (I c & Quench) Long Length Normal State Resistance AC losses Robustness Mechanical & Electrical Integrity Current Density International Workshop on Coated Conductors for Applications December 4, 2008
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