Equipment for electrical energy industry
To protect electrical grids from the increasing short-circuit currents of large metropolitan areas and continuous cycle industries, SuperOx Company designs and manufactures current limiting devices based on high-temperature superconductivity (SFCL). The key difference between SFCL and traditional solutions (current limiting reactors) is variable resistance and instantaneous operation in the event of short circuits.
Since 2014 SuperOx Company has been engaged in SFCL development and production. The first in Russia SFCL with record capacity is installed at the substation 220/20 kV Mnevniki (Moscow) and is in continuous commercial operation since 2019 [M. Moyzykh et al., "First Russian 220 kV Superconducting Fault Current Limiter (SFCL) For Application in City Grid," in IEEE Transactions on Applied Superconductivity]. The 220 kV SFCL limits short-circuit currents according to its design characteristics.
SFCL characteristics
| Pilot | |
|---|---|
| Rated voltage | 6, 10, 35, 110, 220 kV |
| Rated mains frequency | 50 Hz |
| Type (class) | Resistive, inductive |
| Rated current | 250, 400, 630, 1000, 1200, 1600 А |
| Short time electrodynamic current |
3 - 6 kV – 8 kA 10 - 35 kV – 9 kA 110 - 220 kV – 29 kA |
| Apparent resistance under nominal conditions | Maximum 0.1 Ohm |
| Resistance | 0.4 - 6.6 Ohm |
| Thermal resistance | 3 s |
| Recovery time after short-circuit with rated current flowing | Maximum 5 minutes |
| Climatic version | У1 (U1) |
| Power supply | 3 phases, 280/220 V |
| Compliance with standards |
IEC 60076-6 POWER TRANSFORMERS – PART 6: REACTORS 56947007-29.180.04165-2014 STO Rosseti IEEE C37.302-2015 Guide for Fault Current Limiter (FCL) Testing of FCLs Rated above 1000 V AC |