Outdoor Boundary Vacuum Circuit Breaker

SanGao durable outdoor boundary vacuum circuit breaker (hereinafter referred to as "boundary circuit breaker") is suitable for outdoor high-voltage switchgear with three-phase AC 50Hz and rated voltage of 33kV and below. The circuit breaker body is equipped with vacuum arc extinguishing chamber, current transformer, zero sequence current transformer, etc. The circuit breaker has remote management mode, protection control function, and communication function. It can reliably judge and detect substations, industrial and mining enterprises, and urban and rural power grids for the purpose of control and protection. Specially suitable for frequent operation of ground and city level milliampere level zero sequence current and phase to phase fault short-circuit current, achieving automatic elimination of single-phase grounding faults and phase to phase short-circuit faults.

The outdoor boundary vacuum circuit breaker interrupts the arc in vacuum mode and uses SF6 gas insulation. The box adopts advanced imported gas seal, explosion-proof and insulation structure technology, with excellent overall sealing performance. The sealing performance of import and export conduits has also been improved, and the overall sealing performance is good. The SF6 gas filled inside must not leak or be affected by the external environment. The spring operating mechanism has been miniaturized and its performance has been optimized. Adopting main chain transmission and multi-stage trip system, with low resistance and low temperature rise. Its reliability and stability are superior to traditional spring mechanisms.

This product is installed at the responsibility boundary of overhead distribution lines. The front end of the user's incoming line will automatically eliminate single-phase grounding faults and phase to phase short circuit faults within the user's system, avoiding the spread of faults in the user's world to the main transmission line, ensuring the electrical safety of non faulty users, and improving electrical reliability. If the fault is permanent and the substation reclosing fails, the accident at the medium voltage user's site will result in the entire distribution main line being cut off. This common transmission accident in the power grid will cause significant losses to society.

environmental condition

(1) Environmental air temperature: -40 ℃~+40 ℃; The daily temperature change does not exceed 25 ℃; According to the properties of SF6 gas, when the ambient temperature is -40 ℃ and the pressure inside the tank is 0.05Mpa, SF6 is still in a gaseous state to ensure the normal operation of the product. When the ambient temperature is -40 ℃ and the gauge pressure is 0.05Mpa, the liquefaction point of SF6 is -55 ℃; When the gauge pressure is zero, the SF6 liquefaction point will not exceed -60 ℃.

(2) Wind speed not exceeding 35m/s;

(3) A place without flammability, explosion hazard, strong chemical corrosiveness (such as various acids, alkalis, or smoke), and strong vibration.

(4) Altitude: ≤ 1000m;

(5) Coverage thickness: 10mm;

(6) Air pollution level: Level 4;

(7) Seismic intensity: ≤ 7 degrees;

(8) Neutral point grounding method in the power grid: The neutral point is not grounded, it is grounded through an arc suppression coil, and the zero point is grounded through low resistance.