With the development of REBCO coated conductor (CC), the high temperature superconducting (HTS) strand with high current capacity and quasi-isotropic performance is expected to have a wide application. However, the alternating current (AC) loss is one of the major obstacles. This paper aims to study the AC loss of the quasi-isotropic strand stacked by the second generation (2G) HTS tapes and copper tapes at 77 K. In order to fully understand AC loss characteristics of the stackedtape conductor, an efficient 3D finite element method (FEM) model based on T-A formulation was adopted in this simulation. The transport AC loss was measured by four-probe method using SR-830 lock-in amplifier at liquid nitrogen (LN2) bath. Moreover, the amplitude and frequency of transport current were also varied in this experiment. The simulation results are consistent with the experiment which is helpful for studying the AC loss of the quasi-isotropic strand.

In this paper, a 120 kVA single-phase HTS transformer operating in liquid nitrogen at 77 K with high/low voltages of 6000 V/400 V was designed and simulated in a 2-D axisymmetric model. HTS double pancakes were connected in parallel as the low-voltage (LV) windings and a HTS solenoid winding was used as the high-voltage (HV) windings. Based on finite element method (FEM), the field distribution and AC loss of the HTS transformer, also the current distribution in the double pancakes were simulated under the rated operation. According to simulation results, the winding current and AC loss in the two upper and lower double pancakes are much larger than those in other double pancakes. Then the characteristics of current distribution and AC loss of windings were discussed. The developed simulation method in this paper can provide a reference for the design and manufacture of HTS transformers.

Compared with conventional cables, the high-temperature superconducting cables have advantages in a small volume, large capacity, high current density, low losses, and environmental friendship, which brings a new power electricity transmission method for the future power grid. With the development of the important researches in high-temperature superconducting materials, many projects with superconducting cables have been applied in the power system. This paper introduced a main insulation design for three-phase concentric high-temperature superconducting cable under 10-kV power system. AC puncturing test under power frequency and lighting puncture test have been achieved.

In order to improve the ability of superconducting transformer on limiting fault current, the parallel stainless steel & REBCO tapes are used as the winding materials. Firstly, the critical current of an individual REBCO tape and the parallel stainless steel & REBCO tapes under fault current are measured experimentally to compare their ability of limiting fault current. Then the current distribution in the parallel stainless steel & REBCO tapes under different fault currents are simulated. Lastly, a 6 kV/400 V (120kVA) HTS transformer is designed, and the fault current characteristics of wingdings are simulated based on finite element method (FEM). Experimental and simulation results show that the parallel stainless steel tape can improve the current limiting performance of the windings, which is of important referential value for the design of HTS transformer.

In this paper, an NbTi/BSCCO composite conductor made of NbTi/Cu wire and BSCCO/Ag wire cooled by cryocooler were investigated, extending the basic research on current distribution characteristics of low temperature superconductor and high temperature superconductor composite conductor and exploring its potential application. Current distribution characteristics with operating current, temperature, magnetic field, and current frequency were simulated and measured. Current-transfer characteristics between the two superconductors were also obtained.

Nowadays, a large number of new terminal devices are connected to the power system, which greatly increases the risk of network attacks on the terminal and network channels. In order to ensure the safe connection of the power system, it needs to establish the correct identification of the new terminal. For the security threat scenario of traditional terminal identification, this paper studies the fingerprint extraction and recognition technology of devices in the security field of physical layer and transport layer. Device fingerprint is a hardware feature formed by the difference between the electronic components of the device itself. Like biological fingerprint, it has the characteristics of difficult to forge, and can be applied to device authentication to obtain higher security. In this paper, the periodicity of the consistent scrambling of idle data is used to calculate the amplitude spectrum and autocorrelation power spectrum of the signal to extract the fingerprint of NIC. Furthermore, an interactive behavioral feature extraction based on UDP protocol is proposed, which ICMP-ECHO round trip time distribution as a device fingerprint.