220kV Power Transformer

Assembly
The final assembly is carried on in depurated workshop, and injection oil is in vacuum. All components are pre-assembled in the factory, set shipment, and enclosed users service manual.

Active Part
The active part assembled whole and dried under invariable pressure to ensure symmetrically shrink of windings with less rebound, so effectively improve electrical strength and the short-circuit withstand ability. The active part assembled in the purification workshop, after that put the active part into automatic controlling Kerosene Vapor Drying Plant.

Tank
Tanks structures are bell type and barrel type. The plates are curved to corrugated wall. All the sealings are fixed. Metal parts are round horn and go hair. Welding seam and sealed place pass three leakage testing (fluorescence, positive pressure, and negative pressure). The paint is according to the electrical home appliances antirust requirements. For the large capacity transformer, the tank adopts the magnetic shielding to reduce the stray loss.

Core
The core is made of high quality cold-rolled silicon-steel sheet, without holes, frame structure , the D type yoke structure offers the large area platform, Step-lapping and laminated, cut by step-lap core lamination line from GEORG Co. of Germany in order to guarantee core burr smaller than 20??m , reduce no-load loss, no-loaded current and noise level.

Windings
HV winding adopts interleaved-continuous or inside continuous model, which improves the winding vertical capacitance distribution under the impulse voltage. Windings are oil-cycle structure so that it can reduce winding temperature rise. The products?? life is 30 years. The inside of winding has hard supporting and swallow-tail cushion, insulation of the top and the bottom ends are platform pressing plates, makes high mechanical strength and resistance to the sudden short-circuit ability. Winding internal insulation parts and active part of insulation parts are rounded to reduce partial discharge.

All products should be calculated in electric field, magnetic field, temperature rise and short-circuit electric power force by software in order to guarantee magnetic field and oil flow of winding are distributed symmetrically. It has higher electric insulation performance and short-circuit withstand ability.

Structure and construction features

No leakage: All the sealings are fixed, the rims use two sealing and all the sealing is imported. Seriously promise to be no leakage.

Good Aesthetic: Corrugated tank, shot-blast cleaning, electrostatic powder spraying, wide slice radiator and never-fading.

Strong short-circuit withstand ability: Our company independently designed and manufactured the SFP10-200000/220 transformer, which passed the short-circuit test of China National Transformer Quality Supervision Testing Center.

Low partial discharge: The full procedure of 220kV products is completed in a depurated workshop, and the metal components, insulation components of the active part are completely rounded end. The partial discharge is controlled below 70pc.

Low noise: The noise level achieved below 60dB, dropped by nearly 20dB compares to the National Standards. We can also manufacture transformers (below 55dB) to meet customer??s requirements.

1. Low loss: The no-load loss reduced by about 40%, and the load loss reduced by 15%, compares to the actual National Standards GB6451-1999.