Requirements and development history of Oil sealed transformer

Oil sealed transformers can be used indoors and outdoors and can be installed on poles when the capacity is 315kVA and below. The ambient temperature is not higher than 40℃, not lower than -25℃, the highest daily average temperature is 30℃, the highest annual average temperature is 20℃, the relative humidity does not exceed 90%, and the altitude does not exceed 1000m. What are the requirements and development history of Oil sealed transformers?

Here is the content list:

l What are the requirements for Oil sealed transformer?

l The development history of Oil sealed transformer.

What are the requirements for Oil sealed transformer?

Oil sealed transformer will be subject to greater vibration after long-distance transportation, and body inspection is required. The body inspection of an Oil sealed transformer is divided into a hanging core and hanging cover. Regardless of the hanging core or the hanging cover, the inspection content is the same. The hanging core inspection should be completed within one working day to speed up the inspection process.

Take the hanging core inspection as an example. Oil sealed transformer core lifting should be carried out indoors. If there should be a tent outdoors, it is forbidden to lift the core in severe weather such as rain, snow, fog, wind, and sand. In winter, the temperature of the hanging core shall not be lower than zero degrees, otherwise, the temperature of the Oil sealed transformer is increased to make the temperature of the core 10 ℃ higher than the surrounding temperature. The iron core is exposed to the air as short as possible. It should not exceed 16 hours when the relative humidity is 65%, and it should not exceed 12 hours when the relative humidity is 25%. The calculation time is from the beginning of the oil drain to the oil filling. When the relative humidity of the weather exceeds 75%, the hanging core inspection is not allowed. In the process of lifting core inspection, special attention should be paid to preventing parts and tools from falling into the oil tank.

The development history of Oil sealed transformer.

Transformer oil is a petroleum-based liquid, which has the possibility of burning and has disadvantages in environmental protection. However, due to the excellent performance and low price of transformer oil, most oil-sealed transformers still use transformer oil as insulation and cooling medium. At the end of the 19th century, transformers began to use transformer oil as insulation and cooling medium, and Oil sealed transformers appeared. Transformer oil has the following characteristics because of its abundant natural storage capacity and low price, so it has been widely used.

The combination of transformer oil and fiber material has good insulation performance, which can reduce the insulation distance and reduce the cost. Transformer oil has low viscosity and good heat transfer performance. Transformer oil can well protect the core and windings from the influence of moisture in the air. Transformer oil protects the insulating paper and insulating cardboard from oxygen reduces the aging of insulating materials and prolongs the life of the transformer. Except for some special purpose small and medium capacity transformers and gas transformers, most large and medium Oil sealed transformers still use transformer oil as the cooling and insulating medium. The Oil sealed transformer impregnated with transformer oil has a heat-resistant insulation class A, and its long-term working temperature is 105°C.

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