SF-6 Circuit Breakers

Electroshield Samara started production of column-type SF-6 circuit breakers of rated voltage 110 kV. Circuit breakers are designed for switching electrical circuits under normal and emergency conditions in three-phase AC networks.

Advantages of SF-6 circuit breaker VGT-SESH-110:

  • A convenient SF6 density indicator with automatic temperature compensation, equipped with two-level annunciator and three-colour round scale;
  • Circuit breaker position indicator is clearly visible;
  • Reliable spring drive;
  • Pressure relief system for substation and personnel protection;
  • Arc extinguishing chamber with integrated double contact motion technology and automatic blow system;
  • Retaining dielectric strength of circuit breaker insulation in case of SF-6 overpressure loss;
  • Capacitive current switching with restrikes;
  • Low noise level during closing, opening;
  • Availability of two-stage heating and its function control;
  • Low level of overvoltage upon commutation;
  • Durable anti-corrosion coating, steel elements are hot galvanized.
  • Wide range of rated currents, short-time thermal and electrodynamic currents;
  • Long life cycle.

Scope of Application

SF-6 circuit-breaker VGT-SESH-110 is used both for new construction in 110 kV complete transformer substations, and for replacing circuit breakers that have exhausted their life cycle, isolators, short-circuiting switches.

Description VGT-SESH 110 kV
Rated voltage, kV 110
Maximum operating voltage, kV 126
Rated frequency, Hz 50
Power frequency test voltage (1 min), kV 230
Full lightning impulse test voltage, kV 650
Rated current, A 1250, 1600, 2000, 2500, 3150
Rated breaking current, kA 25; 31,5;40
Short-circuit current flow time, s 5
Short-time electrodynamic current (maximum peak), kA 63;80;102
Standard dead time upon automatic reclosing, s 0,3
Weight, no less than, kg 1500