Reasons affecting the operation of three-phase transformers

The three-phase transformer has the unique function of changing the AC voltage. Therefore, the three-phase transformer can convert one level of AC voltage into another level of AC voltage according to the principle of electromagnetic induction to meet the requirements of different loads in the production process. So, what are the main factors affecting the operation of a three-phase transformer?

First: the influence of variable pressure oil aging

The three-phase transformer will gradually age under the action of electricity, heat and oxygen during operation. However, after the transformer oil ages, the air absorption and polymerization degree of the oil will increase, resulting in an increase in gas and kinematic viscosity in the oil. In addition, the increase of the gas inside the three-phase transformer will cause the insulation breakdown voltage of the oil to drop, which cannot adapt to the operating conditions of the three-phase transformer, seriously affecting the operating life of the transformer, and even cause equipment accidents.

Second: the influence of moisture

After kerosene steam drying, vacuum refueling, hot oil circulation and other water removal processes, a certain amount of water will still remain in the three-phase transformer. However, the water in the transformer mainly accumulates in the insulating paperboard and insulating oil, which will deteriorate the electrical performance of the three-phase transformer oil and insulating paperboard, and reduce their resistance and breakdown strength as the water content increases.

Third: the impact of electrical aging

Three-phase transformer oil contains trace moisture and impurities, so the equipment is prone to partial discharge under the action of electric field. In addition, due to the unreasonable design of some three-phase transformers, and the field strength of some parts is higher than other parts, poor internal connection of the three-phase transformer will cause partial discharge, and the continuous development of partial discharge of the equipment will cause insulation breakdown, thereby affecting the transformer's performance. Service life.

Not only that, the good sales of three-phase transformers in the industry will be affected by the aging of transformer oil, moisture, and electricity. In addition, three-phase transformers are also affected by thermal aging. The higher the operating temperature of the equipment, the faster the chemical reaction of the transformer insulation material, the faster the loss of mechanical strength and electrical strength, the greater the relative aging rate, and the shorter the operating life of the transformer.