The fully sealed transformer adopts the fully oil-filled sealed type. The corrugated oil tank shell is a permanently sealed oil tank that adapts to the expansion of oil with its own elasticity, and has been widely used in various power distribution equipment.
Common use conditions:
The altitude does not exceed 1000m indoor or outdoor
Maximum ambient temperature+40 ℃, maximum daily average temperature+30 ℃
Maximum annual average temperature+20 ℃, minimum temperature - 25 ℃
According to user requirements, transformers operating under special conditions can be provided
a) The iron core is made of high-conductivity cold-rolled grain-oriented silicon steel sheet with a thickness of ≤ 0.3mm and 45 ° C fully oblique step stacking. The iron core surface is coated with anti-rust paint to prevent moisture and rust.
b) In addition to copper conductors for small capacity, low-voltage winding generally adopts cylindrical structure of copper foil winding; High-voltage winding adopts multi-layer cylindrical structure, which makes the distribution of ampere-turn of winding balanced, with small magnetic leakage, high mechanical strength and strong short-circuit resistance.
c) The iron core and winding adopt fastening measures respectively. The fastening parts such as the height of the device and the low-voltage lead are equipped with locking nuts respectively. The structure without lifting the core is adopted, which can withstand the bumping during transportation.
d) The coil and iron core are vacuum dried, and the transformer oil is vacuum filtered and filled to minimize the moisture inside the transformer.
e) The oil tank adopts corrugated sheet, which has breathing function to compensate the volume change of oil caused by temperature change, so this product has no oil conservator, which reduces the height of transformer.
f) Because the corrugated plate replaces the oil conservator, the transformer is isolated from the outside, which effectively prevents the entry of oxygen and water and leads to the decline of insulation performance.
g) According to the above six performances, it ensures that the transformer does not need to change oil during the normal operation cycle, greatly reduces the maintenance cost of the transformer, and extends the service life of the transformer.
h) Protective device:
Pressure relief valve - when the internal pressure of the transformer caused by the fault reaches 35kPa, the pressure relief valve acts, releases the pressure or gives an alarm, and when the pressure decreases to the normal value, it returns to the original state, ensuring the continuous operation of the transformer.
Temperature measuring device - 1000kVA and above transformers are equipped with signal thermometers.