Development of HTS transmission power cable

Dai

IEEE Trans. Appl. Supercond.

et al. 2015

High temperature superconducting (HTS) dc power cable shows a wide application prospect in the field of power transmission for its nearly lossless and rather high capacity. IEE has installed a 360-meter long high temperature superconducting (HTS) dc power cable at the self-supply power plant of Zhongfu Industrial Company Ltd. in Gongyi, Henan and the system has operated for two years. The cable connects a 19.5 MVA/1.5 kA silicon-controlled rectifier, which connects with a 110 kV/1 kV transformer, to the bus bar of an electrolytic aluminum cell. It is designed to carry 10-kA current and the voltage is 1300 V. The HTS dc power cable core consists of five conductor layers wound with the spliced Bi-2223 wires with the length of 40 km. The cable core has five layers and 23 HTS wires in each layer with the outer diameter of 45 mm. The HTS dc power cable is fabricated with the spliced superconducting wires which will have effect on the overall superconductivity. Also, since dc output of the rectifier contains a proportion of the ac harmonic ripple, the large dc and small ac will generate the loss in the cable core. In the operation of the 10 kA HTS dc power cable, anode effect will occur in electrolytic aluminum tank, which will lead to a large fault current in the cable and even lead to the power off protection. In this paper, stability of the spliced Bi-2223 wire, stability of the cable core under the cold shrinkage force, loss under the large dc and small ac ripple are analyzed by the theoretical and experimental methods. The test results of ac ripple loss, anode effect, and stable operation are also presented.Index Terms-DC, high temperature superconducting (HTS), power cable, stability, 10 kA.

Section: Introductionmentioning

confidence: 99%

Stability Analysis of the Cable Core of a 10 kA HTS DC Power Cable Used in the Electrolytic Aluminum Industry

Dai

IEEE Trans. Appl. Supercond.

et al. 2015

“…Also, HTS devices are important components in future smart grids, and more and more attention is internationally paid to them. At present, many HTS apparatuses, such as cable, transformer, fault current limiter (FCL), superconducting magnetic storage (SMES), are demonstrated in live-grid [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], among which the HTS cable has operated for long term in power grid [16].…”

Section: Introductionmentioning

confidence: 99%

Progress in inhomogeneity of critical current and index n value measurements on HTS tapes using contact-free method

Wang

Guan

Sci. China Technol. Sci.

et al. 2010

The development of high temperature superconducting (HTS) tapes has recently made great progress, and Bi-based tapes (1 G) and YBCO coated conductor (2 G) are commercially fabricated with practical length. Application of HTS in electric power apparatuses made important achievement, various superconducting devices were demonstrated in grid, laying solid foundation for their commercialization. However, since their intrinsic microscopic defects such as weak-link, granularity, small second phase likely exist, critical current and index n value of the HTS tapes in practical length are impossible homogeneous, which have significant influences on safety, stability and efficiency of the HTS apparatuses. Therefore, critical current and index n value are two important parameters describing inhomogeneity of HTS tapes, thus two important indices for evaluating quality of practical long HTS tapes. This paper focuses on main progresses in inhomogeneity of critical current and index n value measurements on HTS tapes using contact-free methods. The statistical analytical methods evaluating the inhomogeneity of critical current and index n value are suggested. They can provide essential references for design and operation of HTS apparatuses.critical current, contact-free measurement, high temperature superconducting (HTS) tapes, index n value Citation:Wang Y S, Guan X J, Zhang H Y, et al. Progress in inhomogeneity of critical current and index n value measurements on HTS tapes using contact-free method.

Front. Electr. Electron. Eng. China

“…In recent years, practical HTS tapes have been realized commercially and made great progress in electrical power application [1]. Applications such as HTS cables [2,3], transformers [4][5][6], fault current limiters (FCL) [7,8], generators and motors [9], and superconducting magnetic energy systems (SMESs) [10], etc. were successively tested in a live grid.…”

Section: Introductionmentioning

confidence: 99%

Development and test in grid of 630 kVA three-phase high temperature superconducting transformer

Wang

Zhao

Han

et al. 2008

A 630-kVA 10.5 kV/0.4 kV three-phase high temperature superconducting (HTS) power transformer was successfully developed and tested in a live grid. The windings were wound by hermetic stainless steelreinforced multi-filamentary Bi2223/Ag tapes. The structures of primary windings are solenoid with insulation and cooling path among layers, and those of secondary windings consist of double-pancakes connected in parallel. Toroidal cryostat is made from electrical insulating glass fiber reinforced plastics (GFRP) materials with room temperature bore for commercial amorphous alloy core with five limbs. Windings are laid in the toroidal cryostat so that the amorphous core operates at room temperature. An insulation technology of double-half wrapping up the Bi2223/Ag tape with Kapton film is used by a winding machine developed by the authors. Fundamental characteristics of the transformer are obtained by standard short-circuit and no-load tests, and it is shown that the transformer meets operating requirements in a live grid.