ZFW28-72.5/126/145 type SF6 gas insulated switchgear

///ZFW28-72.5/126/145 type SF6 gas insulated switchgear

ZFW28-72.5/126/145 type SF6 gas insulated switchgear



  1. Product introduction

   ZF28A-72.5/126/145 type GIS is composed of standard modules through same sized 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.


  • Completely self-research and development with high starting point and large investment;
  • Inspected to be qualified by KEMA High level of parameters, advanced structural design;
  • Insulation level is higher than IEC and GB standards;
  • Self-blast combined interrupter, 3-position disconnector and earthing switch, spring operating mechanism;
  • Double sealing ring structure;
  • Minimum area;
  • Compact and standardized module design with minimum intervals width 800mm;
  • It is applied to cold, humid, salt fog, coastal, high altitude areas;
  • Autonomously process key components;
  • Spring operating mechanism base processed by  Four Axis Milling CNC Machining Center imported from DMG, German;
  • Basin-type produced by  vacuum epoxy casting Production line imported from Germany  Hubers;
  •   Advanced painting production line; the same standard as automobile; Instrument transformer produce by  Jiangsu Sieyuan Hertz Instrument Transformer Co. Ltd;
  • Advanced quality control system;
  • The whole process and whole life circle quality control;
  • Production management concept for preventing “four pests”;
  • Partial discharge and lightning impulse voltage withstand test before delivery;
  • Advanced inspection and testing equipment;
  • High safety factor;
  • Level 9 seismic resistance;


  1. Application environment
  2. Installation site: indoor/outdoor;
    2. Ambient temperature:
    Maximum temperature: +55
    Minimum temperature: -40
    Maximum daily temperature difference: 32K
    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: 34/700 (m/s)/ Pa
    8. Humidity
    Average of daily relative humidity: 
    Average of monthly relative humidity: 
    9.Seismic resisting ability: 9 degree
    Horizontal acceleration: 0.3g m/s2
    Vertical acceleration: 0.15 m/s2


III. Product features:

  • KEMA test verifies that ZF28A-72.5/126/145 type GIS applies to solidly earthed system (The first pole to clear factor is 1.3.) and neutral point ungrounded system (The first pole to clear factor is 1.5.);
  • E2-M2-C2 level circuit breaker;
  • Special arc extinguish chamber design with spring operation mechanism;
  • The structure is tight and the minimum interval width can reach 800mm;
  • Full three phase encapsulated;
  • Self-developed 3 position isolated grounding switch;
  • The insulation level is higher than GB and IEC standard; under 80% power-frequency withstand voltage, the partial discharge shall be lower than 5pC;
  • German DMG four-axis boring machining center is used to process CB mechanism; 
  • German Hubers vacuum epoxy casting equipments are used to automatically process basin-type insulator;
  • The insulator adopts the metal flange structure, and the epoxy resin will not expose to air; as a result, The service life is long. The double seal ring structure is used and the seal is reliable.;
  • Self-produced electromagnetic type current/voltage transformer;
  • The integrated type and independent type control cabinet can be chosen. There are doors in the front or in the behind. The secondary components are imported and the protection level is IP55W;
  • The advanced surface painting line is used, which can paint GIS shell automatically.


  1. 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.

 ZF28A-72.5/126/145 type GIS is one of the latest generation of switch equipment developed by Shanghai Sieyuan high-voltage switchgear Co., Ltd. It obtains users’ trust because of its miniaturization design and reliable property. At present, the operation performance exists in most parts of domestic and overseas state grid and industry users



Typical performance:


220 kV power transmission and transformation project of Future Park of STATE GRID

Tianjin Great Wall Motor Co., Ltd.

110kv West Hill Dam Metro substation new project of Tengchong County,
Baoshan City, Yunnan Province

Jiangsu Lingkou 110kV S/S (State Grid)