SF6 of ZF28-550 style gas insulated switchgear

///SF6 of ZF28-550 style gas insulated switchgear

SF6 of ZF28-550 style gas insulated switchgear



  1. Product introduction:

ZF28-550 type GIS/ ZH28-550 type HGIS 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.


  • The domestic first high power spring operation mechanism of circuit breaker has the small volume and is safe and stable, free of maintenance. high reliable and conform to oil free and gas free requirements for operation mechanism;
  • Interrupter unit adopts shunt capacitor to balance the voltage between open contacts It improves short line fault breaking capability;
  • Excellent insulation level and low partial discharge. The only company in the industry that can achieve: under the 80% power-frequency withstand voltage (80%×740kV = 592kV), the partial discharge of intervals is lower than 5pC, the partial discharge of the insulator is lower than 3pC. It’s better than the IEC standard that the partial discharge should be lower than 5pC under 1.2 times phase voltage (1.2×550/√3 = 381kV);
  • Partial discharge and lightning impulse voltage withstand test before delivery; The hidden trouble of discharge must be eliminated and ensure the reliability of  products;
  • The insulator quality is stable and reliable. The basin-type insulator pouring process reaches the international advanced level;
  • High parametric: All product technical parameters are the highest standard in the industry;
  • Arrangement of circuit breaker is horizontal, it’s convenient for overhauling and emergency maintenance; it also will make lighter impact to the ground;
  • Compact products with a standardized intervals width 4500mm;
  • 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;
  • Independent control cabinet adopts door in the front and in the behind with high space utilization, which is convenient to installation, commissioning and maintenance and the flexible layout can meet to the customers’ demands and conditions of the field;

  1. Application environment
  2. Installation site: indoor/outdoor;
    2. Ambient temperature:
    Maximum temperature: +55
    Minimum temperature: -40
    Maximum daily temperature difference: 32 K

    3. Altitude: 
    4. Sunshine intensity: 1000 W/m2;
    5. Pollution class: Class III/IV;
    6. Ice thickness: 10 mm/20 mm;
    7. Wind speed/ wind pressure: 34m/s ( equals cylinder surface 700 Pa);
    8. Humidity:
    Average of daily relative humidity: 
    Average of monthly relative humidity: 
    9. Seismic resisting ability: 9 degree;

III. Product usage

In populated regions, it can be compatible with the existing buildings. We can provide you with our products in important and critical substations, in the extension of limited substations, in flexible reform and change, in the heavy-loaded places where we can get economical and reliable energy management. Please tell us your needs.

ZF28-550 type GIS is one of the latest generation of switch equipments developed by Shanghai Siyuan high-voltage switch limited company. It obtains users’ trust because of its miniaturization design and reliable property. At present, this whole set of equipment have passed the KEMA, Netherland  type test.


  1. Product feature
  • Fully spring mechanism, high reliability;
  • Excellent breaking ability;
  • The arc extinguish of CB adopts dual break structure, and shunt capacitor to balance the voltage between open contacts, which improves the breaking ability of short-line fault and the breaking current of short circuit is 63kA;
  • E2-M2-C2 circuit breaker; E2 electrical endurance; M2 mechanical endurance;
  • Strong rated current flow capacity;
  • Excellent insulation level, low partial discharge;
  • Excellent corrosion resistance;
  • Advanced Designing tool;
  • Basin-type insolator with aluminium flange; double sealing structure;
  • Strict assembly technology;