Abstract
The superconducting fault current limiter (SFCL) for a nominal voltage of 220 kV and a rated current of 1200 A was developed by SuperOx company to be applied in high voltage substation in Moscow, Russia. The device is a three-phase dead-tank apparatus and is equipped with a closed-cycle cryocooling system. Liquid nitrogen serves simultaneously as a cooling and an insulating media. The device makes use of about 25 km of 12 mm wide high-performance 2G HTS wire with uniform properties along the length. High-voltage tests of the device were performed at Korea Electrotechnology Research Institute (KERI) in accordance with the IEEE C37.302-2015 test guide and Russian national standards for high voltage electrical equipment. The installation of the SFCL at substation in parallel with the existing air core reactors was completed in 2019. Since then, the device is in a daily operation. Over this period, SFCL has fully confirmed its design specifications including transmitting over 80 million kWh to customers and experiencing three fault current events.
Highlights
HIGH level of fault currents is one of the most challenging issues for large power grids [1], which is especially difficult to deal with in large cities
This paper presents the details of superconducting fault current limiter (SFCL) construction, results of SFCL operation throughout the 2019-2020 period and outlines several future prospects of SFCL technology based on authors’ view
SFCL was installed at the 220/20 kV “Mnevniki” substation in Moscow in parallel with the existing air core reactor and went live in 2019
Summary
HIGH level of fault currents is one of the most challenging issues for large power grids [1], which is especially difficult to deal with in large cities. To provide a comprehensive test of technology in city grid, Moscow-owned electric utility company UNECO decided to install one SFCL at its 220 kV-class substation with high fault current level of above 50 kA. For resistive-type high voltage SFCLs, we would like to mention here two significant engineering milestones of the time: the cooperation of American Superconductor and Siemens one phase of 115 kV device [16,17,18] and Korean Electric Power Corporation one phase of 154 kV device [19,20,21] The task of this project was to design, manufacture, test and install for permanent operation at substation three phases of 220. These instruments enabled Moscow grid operator to predict SFCL behavior and calculate grid regimes and fault current levels within its routine set of operations
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