• Main bus, disconnector and earthing switch are three-phase encapsulated
• Aluminum alloy enclosure, No influence of pollution & salt fog
• High insulation level the partial discharge is less than 5pC under the 80% rated power frequency withstand voltage (368kV) and better than IEC (1.2x252/ kV=174.6 kV)  for the 252 series
• The partial discharge is less than 5pC under the 80% rated power frequency withstand voltage (220kV) and better than IEC (1.2x145/ kV=100.5 kV) for the 145 series
  
• Auto-puffer chamber with a two-stage blast volume including dual moving contact, and breaking reliably
  Equipped with spring mechanism, lower drive energy, more safe and reliable.
  Mechanical endurance: 10000 times;
  Electrical endurance: 20 times.
• Equipped with spring mechanism, lower drive energy, more safe and reliable.
  Mechanical endurance: 10000 times;
  Electrical endurance: 20 times.
• Three-position disconnector and earthing switch, achieve mechanical interlock against the mal-operation of closing of both disconnector and earthing switch, more reliable.
  mechanical endurance: 5000 times.
• Two O-rings sealing, annual gas leakage rate is lower than 0.3%.
• The insulator has aluminum flange, no influence of environment, more reliable
• LCC has two-layer doors against maloperation of body.
• Equipped with bursting disk for each gas compartment.
• Shipment of complete and factory tested bays; significantly reduce transportation and on-site installation time, significantly decrease accident.
• Holding all routine test according to IEC, IEEE and ANSI etc. with the advanced test equipment in the fully shielded  laboratory.

• Modular
• Fully interchangeable for the same modules.
• Create various substation requirements by the combination of the standardized function modules such as circuit breaker, disonnector and earthing switch, fast earthing switch, instrument transformer, bushing and cable termination etc.
• The flange dimension of all modules are same.
• Convenient extension and retrofit in the future, minimize the cost of interruption duration.

• Maintenance-free design, low maintenance cost
• Minimum space requirement, save civil work cost
  Compact, compound design
  Minimum bay width: 800mm
• Shipment of complete bays; significantly reduce installation time , Lower the cost of the foundation and installation

• KEMA type test
  XIHARI type test
  Transportation test
• Seismic imitation and analysis (Horizontal acceleration: 0.5g, Vertical acceleration: 0.3g)
• Holding the analysis of electric field, mechanical strength, dynamic simulation, thermal field, gas flow field, ensure the product reasonable and reliable.
  Apply FMEA
• Experienced and professional supplier, best process for managing supplier.
• Standardized operation, batching system, Self-check, mutual-check, layered audit, quality tracking card
• Certificates-holding , product audit and process audit.
• Standardized installation and commissioning, certificates-holding, life cycle spares Management, Establishing green channel.

Download the SYEC's 145 GIS brochure                     Download the SYEC's 252 GIS brochure