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Measurement of magnetization loss according to the winding pitch of CORC®
Jinwoo Han,Kyeongdal Choi,Woo-Seok Kim,Ji-Kwang Lee 한국초전도저온학회 2021 한국초전도저온공학회논문지 Vol.23 No.4
For the application of HTS wire to AC power equipment, a conductor with high current capacity and low loss is required. CORC®,one of the high-current conductors manufactured using several HTS wires, is made by winding the wires in a spiral on a cylindricalformer. Because the magnetization loss of a CORC®conductor depends on the degree of magnetic coupling between the wiresconstituting the CORC®, it is necessary to know the value of the magnetization loss of the CORC®itself. In order to obtain anaccurate loss value, it is necessary to know the effect of the ratio of the winding pitch of the CORC®conductor in the pickup coilregion sampling the magnetization loss signal. To confirm this effect, we prepare CORC®samples having various winding pitches,and measure and compare the magnetization losses. In addition, the magnetization loss was measured while rotating the CORC®samples and it was examined whether there was a difference in the magnetization loss according to the rotation.
Measurement of magnetization loss according to the winding pitch of CORC®
Jinwoo Han,Kyeongdal Choi,Woo-Seok Kim,Ji-Kwang Lee 한국초전도저온공학회 2021 초전도와 저온공학 Vol.23 No.4
For the application of HTS wire to AC power equipment, a conductor with high current capacity and low loss is required. CORC® , one of the high-current conductors manufactured using several HTS wires, is made by winding the wires in a spiral on a cylindrical former. Because the magnetization loss of a CORC® conductor depends on the degree of magnetic coupling between the wires constituting the CORC® , it is necessary to know the value of the magnetization loss of the CORC® itself. In order to obtain an accurate loss value, it is necessary to know the effect of the ratio of the winding pitch of the CORC® conductor in the pickup coil region sampling the magnetization loss signal. To confirm this effect, we prepare CORC® samples having various winding pitches, and measure and compare the magnetization losses. In addition, the magnetization loss was measured while rotating the CORC® samples and it was examined whether there was a difference in the magnetization loss according to the rotation.
Comparison of HTS conductors for a DC resistive type fault current limiting module
Jooyeong So,Seyeon Lee,Kyeongdal Choi,Ji-kwang Lee,Woo-Seok Kim 한국초전도.저온공학회 2019 한국초전도저온공학회논문지 Vol.21 No.4
The breaking of a circuit in DC grid could pose a challenge because of the absence of zero-crossing instant for both current and voltage when a fault occurs. An additional fault current limiting function will be very helpful for reducing the burden of the DC circuit breaker by limiting the fault current to a reasonable value. In this paper, we studied the overcurrent characteristics of several HTS conductors so that we could use the selected conductors for the basic design work of a resistive type fault current limiting module as a part of the circuit breaking system. According to the short-circuit test results, we suggested and compared two different basic design parameters of the HTS fault current limiting module, which will be connected in series to the DC circuit breaker.