Grade-H Insulation Dry-Type Transformer with Fan

Grade-H Insulation Dry-Type Transformer with Fan

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Introduction: SG(B)10 series non-encapsulated dry-type transformers introduce the US Dupont Reliatran technology and adopt Dupont NOMEX ® paper based insulation system, which is safe and reliable, environmentally friendly, energy saving, fireproof and blastproof, insensitive to humidity dust and pollution, and of great surge capacity, small dimension and easy maintenance. Features: 1) Safe: a) High Level of safety, Grade-H insulation class, fire-resistant, non-combustion- supporting, self-extinguishing, free from toxic gas, good fire protecting performance. b) Free from partial discharge and fissuration in service. The insulation system of the winding is impregnated with solventless insulation varnish time and again by VPI vacuum pressure equipment and solidified through high temperature baking, therefore it is dampproof, antifouling, dustproof, has intense thermal shock bearing ability, and is free from partial discharge and fissuration. c) Small volume and light weight. The transformer adopts Dupont NOMEX ® paper as main insulating material and as insulating system of its most heated point. 2) Reliable: a) Great surge capacity and excellent short circuit bearing ability due to its new design, new material, new technics, and good heat radiation effect. It can run safely under 120% over loading for long time. b) Dupont NOMEX ® paper based insulation system enables the transformer to maintain excellent electrical performance and mechanical property in its whole service life. NOMEX ® paper is hardly aged, shrinkage resistant and compression resistant, and is of high elastic force, thus it can ensure that the windings will still keep tight structure and be able to endure short-circuit impact even after multiyear service. 3) Environmentally Friendly: a) No environmental pollution during the manufacture, transportation, storage, and the whole service life. b) The winding can be disassembled and recycled. c) No toxic gas releases under 750°C d) Low noise. The core consists of high permeability cold rolling grain-oriented silicon-steel sheet laminations. The laminations are arranged in such a way to reduce the noise level and loss factor to a minimum by using step-lap cutting and mounting and the 45°cut at which the cores are placed. Specification 1) Standard: GB/T10228; GB6450; IEC726 2) Capacity range: 30 - 2,500kVA 3) Frequency: 50Hz 4) Phase: 3-phase 5) Tap changing method: off circuit or on load 6) Tapping range: ±4 x 2.5% (9 positions) 7) Connection symbol: Yyn0 or Dyn11 8) Impedance voltage: 4% or 6% 9) Insulation level: LI75AC35/AC5 10) Protective enclosure: with or without NORMAL SERVICE CONDITIONS 1) Altitude: ≤1, 000m 2) Highest ambient temperature: +40°C 3) Highest annual average temperature: +20°C 4) Highest daily average temperature: +30°C 5) Lowest temperature: -30°C for outdoor type; -5°C for indoor type 6) Indoor and outdoor We can also provide transformers operated in special conditions according to users' requirements.