Three-phase switchgear ZF28-420


Electrical characteristics
SF6 gas-insulated
circuit breaker
Primary current

4,000 A


420 V


ZF28-420 type GIS is composed of standard modules through flanged joint, which can meet the demand for substation optimization design through the flexible combination between modules. It saves space and conforms to technical requests.
1) The GIS phase spacing is 670mm and the standard spacing width is 2050mm (see layout). The whole interval of three-phase integrated transportation, its technological innovation level is domestic leading, international advanced level
2) Arrangement of circuit breaker is horizontal, it’s convenient for overhauling and emergency maintenance; it also will make lighter impact to the ground;
3) Excellent insulation level and low partial discharge. The only company in the industry that can achieve: under 1.2 times phase voltage (1.2×420/√3 = 291kV), the partial discharge of intervals is lower than 5pC, the partial discharge of the insulator is lower than 3pC.
4) Flange surface adopts double sealing ring structure, inner ring sealing gas, and its gas leakage rate is lower than IEC standard. Its outer ring prevents water and impurities from getting inside thus to improve safety and reliability;

II. Application environment
1. Installation site: indoor/outdoor;
2. Ambient temperature:
Maximum temperature: +55℃;
Minimum temperature: -40℃;
Maximum daily temperature difference: 32 K;
3. Altitude: ≦3000m;
4. Sunshine intensity: 1000 W/m2;

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