Design and test of current limiting modules using YBCO-coated conductors

Within the cooperation between American Superconductor Corporation (AMSC) and Siemens Corporate Technology we have investigated the fault current limiting performance of YBCO-coated conductors (also called second-generation or 2G HTS wires) stabilized with stainless steel laminates. Design rules for the length and width of the wire depending on utility grid requirements have been established. Bifilar coils have been manufactured and tested with a typical limitation period of 50?ms under stepwise increasing voltage loads to determine the maximum temperature the wires can withstand without degradation. Coils have been assembled into limiter modules demonstrating uniform tripping of the individual coils and recovery within seconds. At present this cooperation is proceeding within a joint project funded by the US Department of Energy (DOE) that encompasses the design, construction and testing of a 115?kV FCL for power transmission within a time frame of 4?5 years, and additional partners. Besides AMSC and Siemens, Nexans contributes the high voltage terminations and Los Alamos National Lab investigates the ac losses. Installation and testing are planned for a Southern California Edison substation. The module planned for the transmission voltage application consists of 63 horizontally arranged coils connected in parallel and series to account for a rated current of 1.2? kArms and voltage of 31?kVrms plus margins. The rated voltage of the module is considerably lower than the line to ground voltage in the 115?kV grid owing to our shunted limiter concept. The shunt reactor connected in parallel to the module outside the cryostat allows for adjustment of the limited current and reduces voltage drop across the module in case of a fault. The fault current reduction ratio is 42% for our present design. A subscale module comprising six full-size coils has been assembled and tested recently to validate the coil performance and coil winding technique. The module had a critical current of 425? ADC and a nominal power of 2.52?MV?A at 77?K. A complete series of tests with applied voltage up to 8.4? kVrms, prospective short circuit current up to 26.6? kArms and variation of phase angle at initiation of the fault has been performed. After more than 40 switching tests the critical current of the module remained unchanged, indicating that no degradation of the wire occurred.

[1]  Wolfgang Schmidt,et al.  Switching behavior of YBCO thin film conductors in resistive fault current limiters , 2003 .

[2]  T. Yazawa,et al.  Design and Test Results of 66 kV High-Tc Superconducting Fault Current Limiter Magnet , 2006, IEEE Transactions on Applied Superconductivity.

[3]  Alexander Otto,et al.  Progress in high temperature superconductor coated conductors and their applications , 2008 .

[4]  Wolfgang Schmidt,et al.  Test of a 2 MVA medium voltage HTS fault current limiter module made of YBCO coated conductors , 2008 .

[5]  Bok-Yeol Seok,et al.  Development of a 13.2 kV/630 A (8.3 MVA) High Temperature Superconducting Fault Current Limiter , 2008, IEEE Transactions on Applied Superconductivity.

[6]  M. Noe,et al.  Investigation of YBCO Coated Conductor for Application in Resistive Superconducting Fault Current Limiters , 2007, IEEE Transactions on Applied Superconductivity.

[7]  M. Noe,et al.  CURL 10: development and field-test of a 10 kV/10 MVA resistive current limiter based on bulk MCP-BSCCO 2212 , 2005, IEEE Transactions on Applied Superconductivity.

[8]  Wolfgang Schmidt,et al.  Investigation of YBCO Coated Conductors for Fault Current Limiter Applications , 2007, IEEE Transactions on Applied Superconductivity.

[9]  Katsuyuki Kaiho,et al.  Study of Superconducting Fault Current Limiter Using Vacuum Interrupter Driven by Electromagnetic Repulsion Force for Commutating Switch , 2006 .

[10]  Wolfgang Schmidt,et al.  Development of Resistive Fault Current Limiters Based on YBCO Coated Conductors , 2009, IEEE Transactions on Applied Superconductivity.

[11]  Jakob Rhyner,et al.  Test of 1.2 MVA high- superconducting fault current limiter , 1997 .

[12]  K.-H. Weck,et al.  System technology and test of CURL 10, a 10 kV, 10 MVA resistive high-Tc superconducting fault current limiter , 2005, IEEE Transactions on Applied Superconductivity.

[13]  D. Park,et al.  Analytical and Experimental Studies on the Hybrid Fault Current Limiter Employing Asymmetric Non-Inductive Coil and Fast Switch , 2009, IEEE Transactions on Applied Superconductivity.

[14]  Qi Guo,et al.  Manufacturing and Test of a 35 kV/90 MVA Saturated Iron-Core Type Superconductive Fault Current Limiter for Live-Grid Operation , 2009, IEEE Transactions on Applied Superconductivity.

[15]  Mathias Noe,et al.  High-temperature superconductor fault current limiters: concepts, applications, and development status , 2007 .

[16]  Y. Shiohara,et al.  Design and Experimental Results of Three-Phase Superconducting Fault Current Limiter Using Highly-Resistive YBCO Tapes , 2009, IEEE Transactions on Applied Superconductivity.