H.D. Li

Chinese Academy of Sciences, Peping, Beijing, China

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Publications (4)3.71 Total impact

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    ABSTRACT: A single winding model, same size and structure with the high voltage winding of a three phase 630 kVA/10.5 kV high temperature superconducting (HTS) transformer, was developed and tested at liquid temperature 77 K in order to study high voltage insulation in the case of lightning impulse. CuNi tape was adopted for the model winding and had same dimension with the multifilamentary Ag-alloy sheath Bi2223 HTS tape which was used in windings of practical HTS transformer. Insulation of CuNi tape was realized by technique of half-double wrapping up Kapton film, the type of high voltage winding was solenoid with multi-layers among which there were layer insulation and cooling paths. The wave process and full wave lightning impulse tests were performed in liquid nitrogen temperature of 77 K in high voltage Lab., TBEA Shenyang Transformer Group. The results show that the full wave lightning impulse withstand voltage is 155 kV which is much higher than the National Standard of 75 kV. The wave process of the winding is theoretically simulated and the calculated results are well in agreement with those of test, the impulse voltage distribution is approximately linearity and no vibration appears. The results provide reliable bases for the development of the 630 kVA/10.5 kV HTS transformer.
    No preview · Article · Sep 2007
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    ABSTRACT: Superconducting Fault Current Limiter (SFCL) is an attractive appliance for modern electrical power system. A 10.5kV/1.5 kA three-phase HTS fault current limiter was developed by IEE, CAS. This improved rectifier-type SFCL with HTS coil of 6.25 mH is going on a demonstrated long-term reliable operation in a real 10.5 kV substation located in Hunan, China. In a three-phase-to-ground short circuit test of grid, the prospective fault current of 3.5 kA was limited to 635 A at the pre-setup short-circuit point successfully
    No preview · Article · Jul 2006 · IEEE Transactions on Applied Superconductivity
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    ABSTRACT: The design and test of High Temperature Superconducting (HTS) coils for a three-phase 10.5 kV/1.5 kA HTS fault current limiter (FCL) are described. It is well known that the critical current (I<sub>c</sub>) of HTS materials is very sensitive to the orientation of fields. In the design of HTS coils, the value of the perpendicular component of magnetic field (B<sub>perp</sub>) should be reduced, and the coils should be wound and jointed easily. In order to enlarge the current carrying capacity of the coil, the double pancakes in the coils were connected in parallel. Based on the field distribution in the coil and the current distribution in each double pancake, the design of the coil was optimized. Three coils wound with Bi-2223/Ag tape have been developed and tested in liquid nitrogen
    No preview · Article · Jul 2006 · IEEE Transactions on Applied Superconductivity
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    ABSTRACT: We prepared 6 coils from the stainless steel-enforced multifilamentary Bi2223/Ag tapes and studied their electromagnetic behavior for a three-phase 26 kVA (400 V/16 V, 37.5 A/937.5 A) transformer. The primary windings were solenoid coils consisted of 4 helically wound layers, and the secondary windings were consisted of 24 double pancakes connected in parallel with 3 layers, the strand of 6 windings was consisted of two parallel transposed multifilamentary tapes. A numerical analysis has been developed to predict the DC and AC behavior of the coils based on measurements of short samples and tested coils at 77 K. A comparison is made between the experiment and model calculation.
    No preview · Article · Jul 2004 · IEEE Transactions on Applied Superconductivity