Equipment for electrical energy industry

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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.

Short-circuit current limitation at the substation

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