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Sarkar, Abhik
- Effect of Moisture Content on the Performance of PPLP as a Dielectric for HTS Power Cable
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Authors
Affiliations
1 Indian Institute of Technology, Kharagpur – 721302, West Bengal, IN
2 SuperQ Technologies India Pvt. Ltd., Bengaluru – 560045, Karnataka, IN
1 Indian Institute of Technology, Kharagpur – 721302, West Bengal, IN
2 SuperQ Technologies India Pvt. Ltd., Bengaluru – 560045, Karnataka, IN
Source
Power Research, Vol 18, No 1 (2022), Pagination: 45-51Abstract
For the operation of High Temperature Superconducting (HTS) power cables at high voltage levels, the electric field distribution depends on the relative permittivity of dielectric materials. In HTS cables, PolyPropylene Laminated Paper (PPLP) is used as a cold dielectric material and is wrapped helically along the length of the conductor thereby electrically insulating it. During the installation and maintenance process of HTS cables, termination units and joint boxes, the PPLP is often exposed to moisture. The presence of moisture affects the dielectric breakdown strength and dielectric losses. The effect of moisture content in PPLP at ambient and liquid nitrogen temperature has been studied to determine the breakdown strength, relative permittivity (εr) and dissipation factor (tan δ). Effect of moisture content on the performance of PPLP via the measurement of dielectric breakdown strength and relative permittivity for various temperatures and moisture content are discussed in this paper.Keywords
Dielectric Breakdown Strength, HTS Cable, Moisture Content, Relative Permittivity, PPLPReferences
- Kwon Ik-Soo, et al. Comparison of the electrical conductivity of polypropylene laminated paper (PPLP) and kraft in LN 2 according to the number of layers. IEEE Transactions on Applied Superconductivity. 2016; 26(4):1–5. https://doi. org/10.1109/TASC.2016.2550182
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- Du H, et al. Insights on the breakdown characteristics of PPLP under different test protocols and temperatures. IEEE Transactions on Applied Superconductivity. 2020; 30(6):1– 6. https://doi.org/10.1109/TASC.2020.2986450
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- Gromoll D, Schumacher R, Humpert C. Dielectric characteristics of polypropylene laminated paper in liquid nitrogen for superconducting devices of the high-voltage grid. 2018 7th International Energy and Sustainability Conference (IESC). IEEE; 2018. https://doi.org/10.1109/ IESC.2018.8439987
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- Hayakawa N, et al. Dielectric characteristics of HTS cables based on partial discharge measurement. IEEE Transactions on Applied Superconductivity. 2005; 15(2):1802–5. https:// doi.org/10.1109/TASC.2005.849292
- Seo I-J, et al. Experimental and analytical study of the DC breakdown characteristics of polypropylene laminated paper with a butt gap condition considering the insulation design of superconducting cable. Japanese Journal of Applied Physics. 2014; 53(8S3). https://doi.org/10.7567/ JJAP.53.08NL04
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- Masood A, Zuberi MU, Husain E. Breakdown strength of solid dielectrics in liquid nitrogen. IEEE Transactions on Dielectrics and Electrical Insulation. 2008; 15(4):1051–5. https://doi.org/10.1109/TDEI.2008.4591227
- Development of Supervisory Control and Data Acquisition System for India’s First High Temperature Superconducting Cable Testing
Abstract Views :75 |
PDF Views:0
Authors
Affiliations
1 Indian Institute of Technology Kharagpur, Kharagpur - 721302, West Bengal, IN
2 SuperQ Technologies India Pvt. Ltd., Bengaluru - 560045, Karnataka, IN
1 Indian Institute of Technology Kharagpur, Kharagpur - 721302, West Bengal, IN
2 SuperQ Technologies India Pvt. Ltd., Bengaluru - 560045, Karnataka, IN
Source
Power Research, Vol 18, No 1 (2022), Pagination: 53-59Abstract
High Temperature Superconductor (HTS) based power cable is a technological marvel which can transmit bulk power over large distances without any joule heating as compared to a conventional copper cable, owing to its zero DC resistance in superconducting state. However, to maintain this superconducting state, the cable must be at a temperature below its critical temperature under self-field. Commonly used HTS material includes BSCCO (Tc = 110 K) and YBCO (Tc = 93 K) and thus, requires cryogenic liquid nitrogen (77 K) for attaining superconductivity. Further, the voltage drops across the various joints such as joint box and current leads in the termination unit must be monitored to ensure optimal operation of the cable. This demands for sophisticated instrumentation operating under extreme low cryogenic temperatures for safe operation, performance monitoring, cryogenic measurements, and control of the HTS power cable cryogenic process. This paper presents the instrumentation scheme followed for testing India’s first 6-meter HTS power cable. The instrumentation scheme involves housing of the various temperature sensors and location of voltage tapping, current measurement, cryogen flow measurements, operation of control valves, operation and measurement of high vacuum system, stray field measurement, insulation resistance measurement and dielectric measurements for cable are the important parameters for the successful operation of HTS power cable. To perform data logging NI-DAQ and LabVIEW software was used to develop in-house Supervisory Control and Data Acquisition (SCADA) system. This paper discusses intrinsic aspects of complete instrumentation and developed SCADA system for HTS power cableKeywords
Cryogenic Instrumentation, HTS Cable, LabVIEW, SCADA, Sensors.References
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- De Souza I, Sarkar, A, Anand A, Sarkar M, Kumar JS, Singh A. Calibration of a Cryogenic Turbine based Volumetric Flow Meter (CTVFM) using sub-cooled liquid nitrogen and solution for its practical issues. IEEE Sensors 21. https://doi.org/10.1109/JSEN.2021.3065309 DOI: https://doi.org/10.1109/JSEN.2021.3065309
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