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< Page ,Total 28 >
Effect of Magnetic Fields on DC Interruption by Liquid Nitrogen in the HTS Electrical System EI SCIE
期刊论文 | 2021 , 31 (8) | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
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Abstract :

The high on-state loss of cryogenic solid-state circuit breakers makes it a heavy burden in realizing the High-Temperature Superconducting (HTS) electrical system. Due to the ability to work in cryogenic circumstances and extremely low on-state loss, the LN2 switch shows excellent application potential in the HTS electrical system. However, the effect of the magnetic fields on the arcing process in the LN2 is still unclear. This paper aims to obtain the effect of the magnetic fields on the arcing process in the LN2. Neodymium (NdFeB) magnets are used to provide the changeable magnetic fields. DC interruptions ranging from 200 A to 1800 A are conducted under 0 mT, 20 mT, and 50 mT respectively. A high-speed camera is also employed to capture the arcing process. Arcing in the LN2 under magnetic fields is characterized as the arc dwell period and arc voltage rapidly increasing period, which is quite similar to that in the air, but more frequent arc restrikes are observed. The magnetic fields strengthen the convective arc cooling by mixing the arc with LN2 and the vaporized N-2, contributing to the sharp increase in arc voltage. Thus, the magnetic fields significantly increase the arc voltage and its raising rate. 630 V/1038 A is successfully interrupted under the magnetic field of 50 mT in the LN2. The successfully interrupted current increases by 8 times when magnetic fields are applied.

Keyword :

Aircraft power systems High temperature superconducting DC power systems Liquid nitrogen DC circuit breakers Magnetic field effects

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GB/T 7714 Li, Hongxu , Xiang, Bin , Wang, Dongyu et al. Effect of Magnetic Fields on DC Interruption by Liquid Nitrogen in the HTS Electrical System [J]. | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) .
MLA Li, Hongxu et al. "Effect of Magnetic Fields on DC Interruption by Liquid Nitrogen in the HTS Electrical System" . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 31 . 8 (2021) .
APA Li, Hongxu , Xiang, Bin , Wang, Dongyu , Junaid, Muhammad , Geng, Yingsan , Liu, Zhiyuan et al. Effect of Magnetic Fields on DC Interruption by Liquid Nitrogen in the HTS Electrical System . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) .
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A Novel Superconducting Current Limiting Type SF6 Gas DC Circuit Breaker Assisted by Quenching Voltage EI SCIE
期刊论文 | 2021 , 36 (2) , 987-996 | IEEE TRANSACTIONS ON POWER DELIVERY
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Abstract :

This paper proposes a novel superconducting current limiting type SF6 DC circuit breaker (DCCB) which has bi-directional breaking function, and the commutation capacitor of the DCCB is charged by quenching voltage of superconducting coils. The new DCCB combines a mechanical type DCCB and superconducting coils. When a short-circuit fault occurs, the superconducting coils quench automatically and become a large quenching resistance. The commutation capacitor in the mechanical type DCCB is charged by quenching voltage of the superconducting coils, and no extra charging circuit is required. Thus, the charging difficulty in high voltage is avoided. Compared with the self-excited oscillation interruption method, a much higher charging voltage and discharge current can be obtained by the quenching voltage of the superconducting coils charging method. Besides, the high discharge current can help the fault current to obtain an artificial current zero immediately. The working and interrupting principles of the novel DCCB are investigated by simulations and experiments. Results show that the DCCB can interrupt the normal, overload and short-circuit currents effectively. Arcing time of the short-circuit interruption can be reduced from several milliseconds or longer to only 0.15 ms and the interruption ability is greatly improved by the proposed interrupting principle.

Keyword :

SF6 quenching voltage of superconducting coils superconducting fault current limiters DC circuit breakers

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GB/T 7714 Xiang, Bin , Yu, Ting , Li, Kun et al. A Novel Superconducting Current Limiting Type SF6 Gas DC Circuit Breaker Assisted by Quenching Voltage [J]. | IEEE TRANSACTIONS ON POWER DELIVERY , 2021 , 36 (2) : 987-996 .
MLA Xiang, Bin et al. "A Novel Superconducting Current Limiting Type SF6 Gas DC Circuit Breaker Assisted by Quenching Voltage" . | IEEE TRANSACTIONS ON POWER DELIVERY 36 . 2 (2021) : 987-996 .
APA Xiang, Bin , Yu, Ting , Li, Kun , Liu, Zhiyuan , Geng, Yingsan , Wang, Jianhua . A Novel Superconducting Current Limiting Type SF6 Gas DC Circuit Breaker Assisted by Quenching Voltage . | IEEE TRANSACTIONS ON POWER DELIVERY , 2021 , 36 (2) , 987-996 .
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Polarity Effect on Standard Lightning Impulse in LN2/Insulation Barrier Composite Systems EI SCIE
期刊论文 | 2021 , 31 (8) | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
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Abstract :

Impulse breakdown voltage is one of the most important factors for the designation of the R-SFCLs. However, no research about the polarity effect on standard lightning impulse in LN2/insulation barrier composite systems has been reported. The objective of this paper is to study the polarity effect on the standard lightning impulse in the LN2/insulation barrier composite systems. The 50% impulse breakdown voltage was measured with a pair of the needle to plane electrodes with the 0.05 mm thick PTFE film. The gap length of the two electrodes was 10 mm. The distance between the needle electrode and the insulation barrier was varied. The time delays during the breakdown progress were recorded by the oscilloscope. The breakdown path was determined by the arc traces on the PTFE films. The results showed that the 50% impulse breakdown voltage of the LN2/insulation barrier composite increased with the insulation barrier get closer to the needle electrode. The results of the time delays reflect that in negative polarity, all the breakdowns occurred in the tail of the waveform. In positive polarity, most of the breakdowns occurred in the head of the waveform. With the barrier get closer to the insulation barrier, the longer time delay Tdelay was in both polarities. And the probability of wave tail breakdown increased in positive polarities. The arc traces on the PTFE showed that all the breakdowns were occurred through the PTFE film.

Keyword :

Barrier effect polarity effect LN2 impulse breakdown breakdown time delays

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GB/T 7714 Gao, Lei , Xiang, Bin , Zhang, Jiahui et al. Polarity Effect on Standard Lightning Impulse in LN2/Insulation Barrier Composite Systems [J]. | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) .
MLA Gao, Lei et al. "Polarity Effect on Standard Lightning Impulse in LN2/Insulation Barrier Composite Systems" . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 31 . 8 (2021) .
APA Gao, Lei , Xiang, Bin , Zhang, Jiahui , Tu, Youping , Li Hongxu , Liu, Zhiyuan et al. Polarity Effect on Standard Lightning Impulse in LN2/Insulation Barrier Composite Systems . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) .
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Decomposition Characteristics of SF6 under Arc Discharge and the Effects of Trace H2O, O-2, and PTFE Vapour on Its By-Products EI SCIE
期刊论文 | 2021 , 14 (2) | ENERGIES
WoS CC Cited Count: 1
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Abstract :

The research on decomposition characteristics of SF6 and its by-products have great significance to the operation, maintenance, condition assessment and fault diagnosis of power equipment. In this paper, the particle composition models of SF6, SF6/polytetrafluoroethylene (PTFE), SF6/PTFE/O-2, SF6/PTFE/H2O, and SF6/PTFE/O-2/H2O were established by using Gibbs free energy minimization method, and the effects of trace H2O and O-2 impurities and PTFE vapour on SF6 by-products were studied by the models. In order to verify the correctness of the simulation results, a series of breaking experiments were carried out on a 40.5 kV SF6 circuit breaker, and a gas chromatograph was used to detect and analyse the SF6 by-products. It was found that when PTFE vapour is involved in the arc plasma, the main by-product after arc quenching is CF4, and the molar fractions of C2F6 and C3F8 are very low. When O-2 is involved, the main by-products are SOF2, SO2 and SO2F2, and a small amount of CO and CO2 was also produced. When H2O is involved, the main by-products in simulation are SOF2, SO2 and HF, and a small amount of SO2, CO2, CO, SO2F2 and H-2 was also produced. The experimental results are in good agreement with the above results.

Keyword :

Gibbs free energy minimization method PTFE vapour H2O and O-2 impurities SF6 by-products breaking experiment

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GB/T 7714 Yang, Ren , Xu, Mengyuan , Yan, Jing et al. Decomposition Characteristics of SF6 under Arc Discharge and the Effects of Trace H2O, O-2, and PTFE Vapour on Its By-Products [J]. | ENERGIES , 2021 , 14 (2) .
MLA Yang, Ren et al. "Decomposition Characteristics of SF6 under Arc Discharge and the Effects of Trace H2O, O-2, and PTFE Vapour on Its By-Products" . | ENERGIES 14 . 2 (2021) .
APA Yang, Ren , Xu, Mengyuan , Yan, Jing , Yang, Minghao , Geng, Yingsan , Liu, Zhiyuan et al. Decomposition Characteristics of SF6 under Arc Discharge and the Effects of Trace H2O, O-2, and PTFE Vapour on Its By-Products . | ENERGIES , 2021 , 14 (2) .
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Controlled Fast Vacuum Breaking of an AC Short-Circuit Current in a Short-arcing Time EI SCIE
期刊论文 | 2021 , 31 (8) | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
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Abstract :

A quick elimination of short-circuit faults in a short time can significantly promote the transient stability of an AC power grid. This paper proposes controlled fast vacuum breaking (CFVB) of a short-circuit current within a short-arcing time. The CFVB technology performs the following: determining a lower-limit opening speed of 3.5 m/s for a 40.5 kV fast vacuum circuit breaker (FVCB), quickly predicting the fault current-zero within 4.0 +/- 0.4 ms to command the FVCB to open at a selected current phase-angle, and optimizing an electromagnetic repulsion actuator with an opening time of 2.5 +/- 0.05 ms to achieve an accurate opening operation. The CFVB technology was deployed in a prototype of single-phase multiple-break 363 kV FVCB to validate its feasibility. The validation involved test duties of T100s(b) and T100a following standards IEC 62271-100 2017 and GB/T 1984-2014. Test results demonstrated that by adopting the CFVB technology, the 363 kV FVCB can successfully interrupt a fault current of 80 kA rms within the first half-wave fault current with a short-arcing time of 2.5 ms. Further application of the CFVB technology could help promote the transient stability of power distribution and transmission systems.

Keyword :

Arcing time electromagnetic repulsion actuator fast vacuum circuit breaker controlled fast vacuum breaking

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GB/T 7714 Yao, Xiaofei , Guan, Chen , Ding, Jian'gang et al. Controlled Fast Vacuum Breaking of an AC Short-Circuit Current in a Short-arcing Time [J]. | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) .
MLA Yao, Xiaofei et al. "Controlled Fast Vacuum Breaking of an AC Short-Circuit Current in a Short-arcing Time" . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 31 . 8 (2021) .
APA Yao, Xiaofei , Guan, Chen , Ding, Jian'gang , Ai, Shaogui , Ma, Kui , Wang, Jianhua et al. Controlled Fast Vacuum Breaking of an AC Short-Circuit Current in a Short-arcing Time . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) .
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Development and Testing of a 252 kV/2500 A-40 kA Multi-Break Bus-Coupler Fast Vacuum Circuit Breaker SCIE
期刊论文 | 2021 , 14 (14) | ENERGIES
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Abstract :

It is effective to open the bus-coupler circuit breaker in case of a short-circuit fault. A fast vacuum circuit breaker (FVCB) is an ideal bus-coupler circuit breaker due to its high velocity. The objective of this study was to develop and test a 252 kV/2500 A-40 kA multi-break bus-coupler FVCB. The 252 kV FVCB contained 12 FVCB units. Each phase consisted of four FVCB units connected in series. Each FVCB unit had an electromagnetic repulsion mechanism with an average opening velocity reaching 6.5 m/s. Test results showed the opening time was 1.11 +/- 0.08 ms. The capacitance of the voltage grading capacitor of each break was determined to be 10 nF. The prototype 252 kV bus-coupler FVCB passed all partial test duties according to the IEC 62271-100: 2008 and IEC 62271-1: 2007 standards, which include an insulation test and a terminal fault test among others. A 252 kV/2500 A-40 kA multi-break bus-coupler FVCB can be used to quickly cut off a short-circuit fault and effectively limit a short-circuit current.

Keyword :

field test fast vacuum circuit breaker bus-coupler circuit breaker type test

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GB/T 7714 Ma, Kui , Yao, Xiaofei , Zhang, Luyang et al. Development and Testing of a 252 kV/2500 A-40 kA Multi-Break Bus-Coupler Fast Vacuum Circuit Breaker [J]. | ENERGIES , 2021 , 14 (14) .
MLA Ma, Kui et al. "Development and Testing of a 252 kV/2500 A-40 kA Multi-Break Bus-Coupler Fast Vacuum Circuit Breaker" . | ENERGIES 14 . 14 (2021) .
APA Ma, Kui , Yao, Xiaofei , Zhang, Luyang , Ai, Shaogui , Wang, Shuhong , Wang, Jianhua et al. Development and Testing of a 252 kV/2500 A-40 kA Multi-Break Bus-Coupler Fast Vacuum Circuit Breaker . | ENERGIES , 2021 , 14 (14) .
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AC Current Interruption Characteristics of Liquid Nitrogen EI SCIE
期刊论文 | 2021 , 31 (8) | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
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Abstract :

There is an increasing tendency to integrate several High-temperature superconducting equipment into a network. Along with it is the increasing demand for cryogenic power switches that could work in the liquid nitrogen (LN2) to reduce temperature transfer areas. However, none of the current AC arc extinguishing mediums could work reliably in the LN2. As the insulation and cooling medium of the HTS equipment, LN2 can be a potential arc extinguishing medium due to its strong cooling effect. However, the AC interruption performance of LN2 is unknown up to now. The objective of this paper is to obtain the AC interruption performance of the LN2. A free-burning type and a magnetic blowout type LN2 switch are tested, respectively. Current ranging from 1 kA to 6.3 kA is conducted. Heat loss of the arcing process is also calculated. Experimental results show that a 2700A AC is successfully interrupted by the free burning type switch at a 10 mm gap. The increase of the contact gap leads to slight growth in current interruption ability. Meanwhile, the magnetic blowout type can interrupt an AC higher than 6300 A. Based on the high interrupting properties of LN2, a potential application in novel environmentally friendly switchgear is proposed. The LN2 switch in the switchgear can switch the closed-loop current that could be typically more than 50% of the continuous current. Meanwhile, the heat loss generated during the arcing process will not add an extra burden to the cooling system of the switchgear.

Keyword :

AC circuit breakers applied superconductivity cryogenic system AC interruption magnetic field effects

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GB/T 7714 Xiang, Bin , Li, Hongxu , Junaid, Muhammad et al. AC Current Interruption Characteristics of Liquid Nitrogen [J]. | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) .
MLA Xiang, Bin et al. "AC Current Interruption Characteristics of Liquid Nitrogen" . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 31 . 8 (2021) .
APA Xiang, Bin , Li, Hongxu , Junaid, Muhammad , Wang, Dongyu , Geng, Yingsan , Liu, Zhiyuan et al. AC Current Interruption Characteristics of Liquid Nitrogen . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) .
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Dynamic Harmonic Phasor Estimator Considering Frequency Deviation SCIE
期刊论文 | 2021 , 21 (21) , 24453-24461 | IEEE SENSORS JOURNAL
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Abstract :

The fundamental frequency of power system may deviate from the nominal value due to various reasons, such as load variation, subsynchronous resonance and fault occurrence. The maximum frequency deviation considered by the latest IEEE standard is 5 Hz. This paper proposes a dynamic harmonic synchrophasor estimator, which can accurately estimate the dynamic harmonic parameters even if the frequency deviation reaches 5 Hz. Multiple discrete frequencies are generated at a fixed frequency interval on both sides of the nominal frequency, and multiple dynamic harmonic filters are generated offline based on those frequencies. The windowed interpolation discrete Fourier transform is adopted for online monitoring of the fundamental frequency. According to the detected frequency, a harmonic filter, which is generated with the discrete frequency that is closest to the detected frequency, can be selected to analyze the dynamic harmonic synchrophasor, frequency and rate of change of frequency. The performances of the proposed estimator are verified through tests under various frequency deviation conditions, and the test results show that the proposed estimator can accurately estimate the dynamic harmonic parameters when the frequency deviation is within 5 Hz.

Keyword :

Phasor measurement units Frequency estimation Resonant frequency harmonic phasor frequency deviation Taylor-Fourier model Thin film transistors Power harmonic filters Dynamic model Harmonic analysis harmonic analysis Power system dynamics

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GB/T 7714 Li, Wenfan , Zhang, Guogang , Chen, Muli et al. Dynamic Harmonic Phasor Estimator Considering Frequency Deviation [J]. | IEEE SENSORS JOURNAL , 2021 , 21 (21) : 24453-24461 .
MLA Li, Wenfan et al. "Dynamic Harmonic Phasor Estimator Considering Frequency Deviation" . | IEEE SENSORS JOURNAL 21 . 21 (2021) : 24453-24461 .
APA Li, Wenfan , Zhang, Guogang , Chen, Muli , Zhong, Haojie , Geng, Yingsan . Dynamic Harmonic Phasor Estimator Considering Frequency Deviation . | IEEE SENSORS JOURNAL , 2021 , 21 (21) , 24453-24461 .
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Applications of A LN2 Switch Combining With the SFCL in the HTS Electrical Propulsion System EI SCIE
期刊论文 | 2021 , 31 (8) | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
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Abstract :

The high conduction loss of solid-state circuit breakers blocks the HTS electrical system implementation for future aircraft. An LN2 switch marries the low conduction loss with good DC interruption performance in the cryogenic circumstance. It shows a fascinating prospect in the HTS electrical system. However, the possible applications of such a novel switch have never been discussed. This paper proposed two potential strategies for applying the LN2 switch into the HTS electrical system. A low voltage experiment is conducted to validate the combination of the SFCL with an LN2 switch. Heat loss is also calculated based on the experimental results. Same level solid-state circuit breakers with cryogenic parameters are set as a fair comparison. A 10 kA prospective short circuit current is limited to 1.4 kA by SFCL within 580 mu s and then interrupted by the LN2 switch within 12 ms. The fast response of SFCL compensates for the long clear time of the LN2 switch. Heat loss of this combination is 1/120 of the heat generated by the same level SSCB in an assumed 2-hour flight. With proper design, such a combination could meet the protection requirements of any specific HTS electrical system. Refrigeration system size and weight can be significantly reduced.

Keyword :

Aircraft power systems liquid nitrogen high-temperature superconductors (HTS) DC circuit breakers superconductive fault current limiter cryogenic electronics

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GB/T 7714 Li, Hongxu , Xiang, Bin , Wang, Dongyu et al. Applications of A LN2 Switch Combining With the SFCL in the HTS Electrical Propulsion System [J]. | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) .
MLA Li, Hongxu et al. "Applications of A LN2 Switch Combining With the SFCL in the HTS Electrical Propulsion System" . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 31 . 8 (2021) .
APA Li, Hongxu , Xiang, Bin , Wang, Dongyu , Gao, Lei , Geng, Yingsan , Liu, Zhiyuan et al. Applications of A LN2 Switch Combining With the SFCL in the HTS Electrical Propulsion System . | IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY , 2021 , 31 (8) .
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DC Surface Flashover Characteristics of Insulation Film in LN2 and Bubbles Composite EI Scopus
会议论文 | 2020 | 2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2020
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Abstract :

A combination of resistive type superconducting fault current limiters (R-SFCLs) and mechanical-type DC circuit breaker is a reliable way to protect the medium voltage and high voltage DC systems. Using the insulation barrier plays an important role in enhancing the insulation strength of R-SFCL. It promotes the development of R-SFCLs to a higher voltage level. However, the bubbles effect on the DC flashover characteristics of the insulation barrier is unknown. The objective of this paper is to obtain the DC flashover characteristics of insulation film with and without bubbles in liquid nitrogen (LN2). In the experiments, a triangle-plane electrode was put horizontal and immersed in LN2. A 14 W heater was placed right below the gap of two electrodes. Negative flashover characteristics of PTFE and Kapton were studied with different gap distances. The results show that the negative flashover voltage of PTFE film increases with the increase of gap distance both in conditions with and without bubbles. The shorter the gap distance between the triangle and plane electrodes is, the stronger the influence of bubbles on the negative flashover voltage is. The flashover voltage of PTFE is 1.15 times of Kapton both in the conditions with and without bubbles. The results could be used to design the insulation structure of high voltage R-SFCLs. © 2020 IEEE.

Keyword :

Electrodes Flashover Superconducting fault current limiters Electric circuit breakers Insulation Electromagnets HVDC power transmission Polyimides Liquefied gases Fault current limiters Insulating materials

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GB/T 7714 Gao, Lei , Xiang, Bin , Junaid, Muhammad et al. DC Surface Flashover Characteristics of Insulation Film in LN2 and Bubbles Composite [C] . 2020 .
MLA Gao, Lei et al. "DC Surface Flashover Characteristics of Insulation Film in LN2 and Bubbles Composite" . (2020) .
APA Gao, Lei , Xiang, Bin , Junaid, Muhammad , Li, Hongxu , Liu, Zhiyuan , Geng, Yingsan et al. DC Surface Flashover Characteristics of Insulation Film in LN2 and Bubbles Composite . (2020) .
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