Feasibility study of optical fiber sensor applied on HTS conductors

Zhou, Kang; Ren, Li; Pu, Dongshen; Chen, Guilun; Yu, Tang

doi:10.1016/j.physc.2020.1353693

Cited by 10 publications

(6 citation statements)

References 14 publications

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“…Since the impedance characteristics of superconducting cables are quite different from those of conventional cables, the power flow and relay protection will undergo some significant changes with the application of HTS cables. In addition to optical fiber detection [31,32], parallel-connected cable protection [33], and other research on quenching, the focus can be extended from the cable body to the distribution network. Therefore, the study of protection schemes for DNSC systems is an interesting topic, which can also provide guidance for other superconducting devices' applications.…”

Section: Introductionmentioning

confidence: 99%

Transient research on distribution networks incorporating superconducting cables utilizing field–circuit coupling method

Li,

Tang,

Ren

et al. 2023

Supercond. Sci. Technol.

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High temperature superconducting (HTS) cable represents a promising solution for fulfilling the power demands of cities with large loads and high density. However, due to their connection to the distribution network, HTS cables are vulnerable to fault currents exceeding ten times their rated current, which poses a serious threat to both the safety of the cable and the operation of the grid. Considering the highly nonlinear nature of superconducting conductivity, this study develops a field–circuit coupling model to investigate the transient characteristics of distribution networks incorporating superconducting cables (DNSC). Firstly, a finite element model based on the two-dimensional H formulation was built to calculate the electrical and thermal parameters of the HTS cable. Subsequently, an equivalent circuit model of the distribution network was employed to estimate the short-circuit currents. Communicating via a co-simulation server, the superconducting cable current and distribution network impedance were updated in each step. Further, based on an actual DNSC system in Shenzhen, China, the highest quenching temperature of the cable and the maximum fault current of busbars were assessed. Finally, by integrating current limiters into the system, the withstand capability of the cable and busbars was determined, which indicates that the improved protection configuration can effectively suppress fault currents and ensure safe operation. Successfully applied to an actual distribution network, the co-simulation model utilizing the field–circuit coupling method addresses the challenges of solving highly nonlinear and time-varying systems, enabling transient analysis and protection research for the integration of superconducting devices into the conventional grid.

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Section: Introductionmentioning

confidence: 99%

Transient research on distribution networks incorporating superconducting cables utilizing field–circuit coupling method

Li,

Tang,

Ren

et al. 2023

Supercond. Sci. Technol.

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“…There are several typical design schemes of the CPW resonator capacitive coupled to the transmission lines, such as half-wavelength resonator, which is coupled by capacitors at each end to input and output ports [8][9][10][11], or 1/4-wavelength resonator, which could be coupled to the transmission line by capacitors or inductors using one port and the other end is shorted to ground planes. The cavity quantum electrodynamic experiments include microwave photons and superconducting qubits, have been successfully demonstrated in a superconducting microwave resonator.…”

Section: Introductionmentioning

confidence: 99%

Temperature and power characteristics of quarter-wavelength superconducting coplanar waveguide resonator

Jing

Hua

et al. 2022

SN Appl. Sci.

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A quarter wavelength superconducting aluminum film coplanar waveguide resonator with a high-quality factor was designed and fabricated. Furthermore, its resonant frequency and quality as a function of temperatures and exciting powers were investigated. The experimental results showed that the resonance frequency decreases about 1% with the increase of temperature from 50 mk to 1 K, and the load quality factor of the resonator also decreases. The resonant frequency decreases with power from − 120 to − 70 dBm. The quality factor increases with increased excitation power due to the loss decreases and nonlinearity. The results are consistent with the theoretical analysis of the surface impedance model.

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“…Non-conventional quench detection techniques are based on either direct or indirect effects of quench. The direct effects are the voltage drop [11][12][13] and temperature changes [14]. Indirect effects include the changes in the cable structure [7], cryogenic fluid [15,16] and the acoustic [17][18][19] electric [20] and magnetic environments [21].…”

Section: Introductionmentioning

confidence: 99%

Feasibility study of capacitance based quench detection technique for HTS power transmission cables

Hassan

Sagar

Gour

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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2nd Generation High Temperature Superconducting (2G HTS) tapes are replacing the conventional Low Temperature Superconducting (LTS) wires in various felds of applied superconductivity, especially in the power transmission applications. Transients in the electrical grid can result in the loss of superconductivity leading to thermal runaway. This phenomenon is known as quench. To avoid catastrophic consequences, timely detection of quench is imperative. However, the HTS materials possess a low Normal Zone Propagation Velocity (NZPV) compared to LTS materials during quench. This property combined with a low electromagnetic shielding makes the conventional voltage tap detection technique unreliable for HTS power transmission cables. A capacitance based quench detection technique is proposed and its feasibility is studied. A variation in the permittivity of the cryogenic fuid and the dielectric can be observed in association with the heat generation during faults. This can be refected as the variation in the measured capacitance between cryostat and cable former. In this study, this capacitance is computed using the FEM model of HTS cable operating at various temperatures along with diferent vapour liquid ratios of cryogen. The results of this work can be extended into experiments for quench detection in HTS power transmission cables.

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Feasibility study of optical fiber sensor applied on HTS conductors

Cited by 10 publications

References 14 publications

Transient research on distribution networks incorporating superconducting cables utilizing field–circuit coupling method

Transient research on distribution networks incorporating superconducting cables utilizing field–circuit coupling method

Temperature and power characteristics of quarter-wavelength superconducting coplanar waveguide resonator

Feasibility study of capacitance based quench detection technique for HTS power transmission cables

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