Sealed dry type power transformers

Product Description

The core adopts high permeability cold rolling grain-oriented silicon-iron sheets, *5��full inclined step-by-step seam welding, and the core is of special square-tube drawplate structure, the core stem is bound up with insulation tape. The core surface is applied with special resin to prevent damp and rust, and its open-circuit loss, no-load current and core noise are all significantly lowered. It is safe, flame resisting, fireproofing, pollution free, and can be mounted on load center. It is maintenance free, installation friendly and cost effective. It is of good humidity resistance. It can work at **0 % humidity with failure free, and can be put into another service immediately upon previous operation without preliminary drying. Low loss, low partial discharge quantity, low noise but high heat-sinking capability. In the condition of forced air cooling, it may run at **0 % of rated load. Foil winding: Low voltage winding is fabricated by winding an integral segment of copper foil, together with F-class turn-to-turn insulation, on a special low-voltage foil winder. Foil winding resolved the challenges of, for the low-voltage heavy-current windings and wire wound products, great short circuit stress, unbalanced ampere turns, poor heat radiation effect, existence of helix angle, and inconstant manual welding quality. Besides, our product' winding head is solidified and formed by the way of resin-encapsulation, which features not only damp proof but also anti-fouling. The lead copper bars are automatically welded in the way of argon arc welding. Temperature control unit: BWDK series signaling thermometer is adopted by the transformer, and the temperature element is embedded in the upper part of the low-voltage coil, which may test each working temperature of three phase coils in a automatic mode and displays them in a cyclic mode. Meanwhile, it has over-temperature alarm and tripping functions. Scope of Application:airport, subway, power plant, etc.