Oil Immersed Transformer 10 kV

10 kV Oil Immersed Transformer: The oil immersed power transformer is used for regulating voltage and AC power transmission. It consists of the core, voltage regulating switch, oil tank and other components, with dielectric oil as the insulating medium.

Features:

Core

The core is made of high-quality grain-oriented cold-rolled silicon steel sheet, with fully mitred joints and a hole-free banded structure. It has a multi-step profile with three or five joints, giving low no-load loss and low noise. Rolled cores are wound directly on special equipment, so they have no seams, no corner weight, lower reluctance and low no-load loss. Amorphous alloy is an advanced core material that reduces no-load loss by 72% and no-load current by 50% on average.

Coil

The coils are made of high-quality QQ acetal enameled round copper wire and oxygen-free copper rod. The coil type includes cylinder type, continuous type, new type spiral type, split type, etc. It has sufficient electrical strength, mechanical strength and cooling capacity. To improve the short-circuit withstand capability of the transformer, self-adhesive transposed wire is used in windings of 35 kV and above. The wire is self-adhesive acetal enameled flat wire; after the coil is wound, it is heated so that the strands bond into a rigid coil that withstands greater bending stress. Self-adhesive transposed wire also reduces transformer losses: because the conductor is multi-stranded and transposed, eddy current and circulating current losses are greatly reduced, hot-spot temperature rise in the winding is lower, and the winding temperature is more uniform.

Oil tank

The oil tank is made of high-quality steel plate in elliptical, rectangular and other shapes. Radiator types include corrugated sheet radiators, expansion radiators and corrugated tanks. Oil tanks are tested for sealing performance. The inside and outside surfaces are pickled and phosphated, then sprayed with three coats of primer and one top coat for corrosion resistance.

Normal service condition

Ambient air temperature

Maximum temperature: +40°C

Minimum temperature: -45°C

Average temperature of the warmest month: +30°C

Highest annual average temperature: +20°C

Altitude: ≤1000m

Contamination class: Ill

Seismic intensity: VIII

Power supply voltage waveform: approximately sinusoidal