High-overload high-temperature-resistant oil-immersed transformer

Abstract

The invention provides a high-overload high-temperature-resistant oil-immersed transformer which comprises an underframe and an oil tank. A tank cover is arranged at an upper end opening of the oil tank, a rubber strip is arranged between the upper end opening of the oil tank and the tank cover, a transformer core is arranged in the oil tank, and the oil tank is filled with 110-kv high-temperature-resistant insulation oil. Lifting plates, low-voltage sleeves, high-voltage sleeves, a tap switch, an oil level indicator and a thermometer seat are arranged on the upward face of the tank cover, the lifting plates are symmetrically distributed at the four corners of the tank cover, the low-voltage sleeves are evenly distributed on one side of the tank cover, and the high-voltage sleeves are evenly distributed on the other side of the tank cover. The transformer core comprises an iron core, a low-voltage coil is wound around the outside of the iron core, a high-voltage coil is wound around the outside of the low-voltage coil, the high-voltage coil passes through the tap switch to be connected with the high-voltage sleeves, and the low-voltage coil is connected with the low-voltage sleeves. Turn insulation of the high-voltage coil and the low-voltage coil is NOMEX insulation paper; the front side wall and the rear side wall of the lower end of the oil tank are concave inwards to form bottom grooves. The high-overload high-temperature-resistant oil-immersed transformer is small in size, compact in structure, long in service life and resistant to high temperature.

Description

technical field [0001] The invention relates to the technical field of transformers, in particular to a high overload and high temperature resistant oil-immersed transformer. Background technique [0002] Oil-immersed transformers are suitable for power systems, industrial and mining enterprises, transportation, post and telecommunications departments, scientific research units, etc., to conduct dielectric strength tests on various high-voltage electrical equipment, electrical components, and insulating materials under power frequency or DC high voltage. Oil-immersed transformers rely on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air-cooled, oil-immersed water-cooled and forced oil circulation. The role of oil is insulation, heat dissipation, and arc elimination. Generally, the main transformer of the step-up station is oil-immersed, with a transformation ratio of 20KV / 500KV, or 20KV / 220KV. Generally, the factory transformer used to drive its...

AI Technical Summary

Problems solved by technology

Although the flash point of insulating oil is generally higher than 145°C, insulating oil is easily decomposed at high temperature and burns when exposed to an open flame

If the transformer is overloaded for a long time, the coil will heat up and the insulation will gradually age, which will easily cause a short circuit between turns, short circuit between phases or short circuit to ground.

When a short circuit occurs,

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