Speaker
Ms
Kim Heesun
(Korea electric power corporation)
Description
The superconducting fault current limiter (SFCL) is an electric power device which limits the fault current immediately in a power grid. Korea Electric Power Corporation (KEPCO) has been developing a 154 kV, 2 kA SFCL since 2011 to protect power grids from increasing fault current and improve stability and quality of electric power. This SFCL adopts 2G YBCO wires and operates at 71 K and 5 bars. In this paper, a cooling system for the 154 kV SFCL and its test results are reported. This cooling system uses a Stirling-type cooler to make subcooled liquid nitrogen (LN2), which cools superconductor modules of the SFCL. LN2 is circulated between the cooler and the cryostat that contains modules by a cryo-circulating pump. LN2 also plays a role of a high voltage insulator between the modules and the cryostat, so it was determined to be kept at 5 bars for high insulation performance. This cooling system had been made, installed on a test site, and tested without superconductor modules. In this operation test, some important data were measured such as temperature distribution in LN2, pressure change, performance of a heat exchanger and cooling capacity of the total system. The results showed this cooling system operates well as originally designed.
Author
Ms
Kim Heesun
(Korea electric power corporation)
Co-authors
Dr
Han Young Hee
(Korea electric power corporation)
Dr
Hong Yong Joo
(Korea Institute of Machinery and Materials)
Dr
In Sehwan
(Korea Institute of Machinery and Materials)
Dr
Kim Hye-Rim
(Korea electric power corporation)
Mr
Park Byung Jun
(Korea electric power corporation)
Dr
Park Kijun
(Korea electric power corporation)
Dr
Yang Seong Eun
(Korea electric power corporation)
Dr
Yeom Hankil
(Korea Institute of Machinery and Materials)
Mr
Yu Seung-Duck
(Korea electric power corporation)
