11kv 1000 Kva on Load Tap Change Power Transformer

The core of 11kv 1000 kva on load tap change power transformer all use high quality grain oriented cold-rolled silicon steel sheets. The structure is fully inclined and without holes, and the core is multi-level stepped shape, with three or five seams. The air loss and the noise are low. The rolled core is directly rolled using special equipment, without seams , reducing magnetic resistance and resulting in low air loss.

Windings use high quality copper wire. They are made by drawing oxygen free copper rods or copper coils. Its forms include cylindrical, new spiral, and split types, etc, which ensures the 11kv 1000 kva on load tap change power transformer has sufficient electrical strength, mechanical strength, and heat dissipation capacity.

Oil tank is made of high quality steel plates welded together. The heat dissipation components use chip type heat sinks, expansion heat sinks or corrugated oil tanks. The oil tank undergoes reliable sealing tests in the factory. After the inner and outer surfaces are acid washed and phosphated, 11kv 1000 kva on load tap change power transformer is painted with three base and one surface coating, which is both corrosion resistant and elegant.

Technical specification:

Q:Why are silicon steel sheets used as the core of 11kv 1000 kva on load tap change power transformers?

A:The common transformer cores are usually made of silicon steel sheets. Silicon steel is a type of steel containing silicon, with the silicon content ranging from 0.8% to 4.8%. Using silicon steel as the core of a transformer is because silicon steel itself is a highly magnetic material. In an energized coil, it can generate a large magnetic induction intensity, thereby reducing the volume of the transformer.

We know that in reality, the 11kv 1000 kva on load tap change power transformer operates under an alternating current condition. Power loss not only occurs in the coil's resistance but is also present in the iron core due to the alternating electromagnetic influence. The power loss in the iron core is usually called "iron loss", and it is caused by two reasons: one is "hysteresis loss", and the other is "eddy current loss".

Hysteresis loss is the iron loss generated by the core during magnetization due to the hysteresis phenomenon. The magnitude of this loss is proportional to the area enclosed by the magnetic hysteresis loop of the material. The magnetic hysteresis loop of silicon steel is narrow, so using it as the core of a transformer results in less hysteresis loss, which significantly reduces the heating degree.

Meanwhile, due to the presence of silicon elements, silicon steel can significantly increase the resistivity of the iron core material, effectively suppressing the induced eddy currents generated by the alternating magnetic field within the iron core, and greatly reducing eddy current losses.

The laminated and stacked structure of silicon steel sheets, combined with their own low loss characteristics, enables the 11kv 1000 kva on load tap change power transformer iron core to have a lower temperature rise under power frequency AC conditions, and operate more energy efficiently and stably.

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