Product Details

1. The first high-power spring operating mechanism of circuit breaker in the country, with small volume, safety and stability, maintenance free and high reliability, conforming to oil-free and gas-free requirements of operating mechanism.

2. The arc extinguish chamber unit uses the unique break structure and the method of break in parallel with capacitor is used to balance the voltage between breaks and enhance the breaking capacity of close-in fault. Excellent insulation level and small partial discharge: The only one in the industry succeeded in the partial discharge energy of the total bay being less than 3pC under 80％ power frequency withstand voltage (80％ x 740kV=592kV), being higher than requirement of being less than 5pC of partial discharge energy of total bay under 1.2 times phase voltage (1.2x550/√3=381kV) as required by the standard.

3. All electric equipment leave the factory after lightning impulse test to completely eliminate insulation discharge hazard and ensure stable and reliable product quality.

4. The insulating parts are stable and reliable in quality and the casting process of basin-type insulator reaches international advanced and domestic leaving level.

5. The horizontal arrangement of the circuit breakers is more convenient for overhaul and rush repair, with small impact to the ground. The main busbar is placed on other sides of the circuit breaker to fully use tank body and nearby spatial position and the patrol and overhaul passage as well as the local control cabinet location are rationally distributed to realize centralization of patrol, with ease and safety.

6. GIS is the compact type product, with the standard bay width of 5000mm, and the standard phase spacing of 1350mm.

7. The first in the industry uses three-phases disconnector and earthing switch.

8. The flange face uses dual sealing structure and inner ring for sealing gas reaches lower lower air leak rate than IEC standard, and outer ring for preventing the entry of moisture and impurities enhances the safety and reliability of running.

9.Independent cabinet: uses front and rear double-door structure, with higher space utilization rate and easy installation, commissioning and operating maintenance; and it can be flexibly arranged according to customers’ requirement and site conditions.

Rated Voltage 550kV
Rated Frequency 50Hz/60Hz
Rated Current 4000A/5000A/6300A
Insulating Level 1 Min Power   Frequency Withstand Voltage (Ur,r.m.s) Between Open Contacts 740kV+315kV
To Earth,   Between Phases 740kV
Rated Lightning Impulse Withstand Voltage (Up,peak) Between Open Contacts 1675kV+450kV
To Earth,   Between Phases 1675kV
Rated Switching Impulse Withstand Voltage (Us,peak) Between Open Contacts 1175kV+450kV
To Earth,   Between Phases 1300kV
Partial   Discharge(at 80％ Power Frequency Withstand Voltage) (Total Bay) 3pC
Rated Short Circuit Breaking   Current 63kA
Rated Peak withstand Current 171kA
Rated Short-time Withstand   Current and Duration 63kA,3S
Moisture Content of SF6 Gas of Compartments Circuit Breaker   Compartment Commissioning 150ppm(μL/L)
Operating 300ppm(μL/L)
Other Compartments Commissioning 250ppm(μL/L)
Operating 500ppm(μL/L)
Leakage Rate of SF6 Gas Per Year ≤0.1％ per year
Times of Short-circuit Breaking   Current(Electrical Endurance) 20 times
Mechanical Endurance Circuit Breaker 10000 times
Disconnector/Earthing   switch/Fault-making Earthing Switch 10000 times
Service Life ≥30years
Maintenance Cycle ≥20years
Times of Rated Short Circuit   Making Current (FES) 2 times

Product Parameter
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