TY - GEN
T1 - Preliminary Assessment of an Ultrasonic Level Sensor for the Calorimetric Measurement of AC Losses in Superconducting Devices
AU - Walker, Ricardo
AU - Durão, Diogo
AU - Dias, Diogo
AU - Catarino, Isabel
AU - Murta-Pina, João
AU - Oliveira, Roberto
N1 - Funding Information:
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00066%2F2020/PT#
info:eu-repo/grantAgreement/FCT/9471 - RIDTI/PTDC%2FEEI-EEE%2F32508%2F2017/PT#
This work was supported by project tLOSS (Transforming Losses Calculation in High Temperature Superconducting Power Systems), funded by FEDER (Programa Operacional Regional de Lisboa) and Portuguese national funds LISBOA-01-0145-FEDER-032508;
Publisher Copyright:
© 2022 IEEE.
PY - 2022/7
Y1 - 2022/7
N2 - Superconducting materials show no resistivity under DC regimes and can generate extremely high magnetic flux densities, allowing for the development of disruptive or improved power grid applications. Yet, under AC, they experience losses that must be removed by the respective cryogenic system, which is responsible for maintaining the superconducting state. Measuring these losses is of utmost importance, e.g., for monitoring the condition of superconducting devices. In this paper, a new calorimetric method for measuring AC losses in superconducting systems is investigated. The proposed concept infers the level of the cryogenic fluid in a cryostat by measuring the echo time from sound waves reflected on it. The thermal energy (losses) that leads to fluid evaporation is then calculated. Using this method may lead to a faster and more direct approach to measuring losses when compared to other concepts, even if the sensor shows some error factors, as well as strict environmental requirements for its operation. A prototype of the sensor is tested in liquid nitrogen, and a preliminary assessment of its performance is carried out.
AB - Superconducting materials show no resistivity under DC regimes and can generate extremely high magnetic flux densities, allowing for the development of disruptive or improved power grid applications. Yet, under AC, they experience losses that must be removed by the respective cryogenic system, which is responsible for maintaining the superconducting state. Measuring these losses is of utmost importance, e.g., for monitoring the condition of superconducting devices. In this paper, a new calorimetric method for measuring AC losses in superconducting systems is investigated. The proposed concept infers the level of the cryogenic fluid in a cryostat by measuring the echo time from sound waves reflected on it. The thermal energy (losses) that leads to fluid evaporation is then calculated. Using this method may lead to a faster and more direct approach to measuring losses when compared to other concepts, even if the sensor shows some error factors, as well as strict environmental requirements for its operation. A prototype of the sensor is tested in liquid nitrogen, and a preliminary assessment of its performance is carried out.
KW - AC loss
KW - calorimetric method
KW - high-temperature superconductor (HTS)
KW - ultrasonic sensor
KW - ultrasound
UR - http://www.scopus.com/inward/record.url?scp=85137417181&partnerID=8YFLogxK
U2 - 10.1109/YEF-ECE55092.2022.9850039
DO - 10.1109/YEF-ECE55092.2022.9850039
M3 - Conference contribution
AN - SCOPUS:85137417181
SN - 978-1-6654-6732-2
T3 - Proceedings - 2022 International Young Engineers Forum in Electrical and Computer Engineering, YEF-ECE 2022
SP - 112
EP - 116
BT - Proceedings - 2022 International Young Engineers Forum in Electrical and Computer Engineering, YEF-ECE 2022
PB - Institute of Electrical and Electronics Engineers (IEEE)
T2 - 2022 International Young Engineers Forum in Electrical and Computer Engineering, YEF-ECE 2022
Y2 - 1 July 2022 through 1 July 2022
ER -