What is the relationship between dry power transformer temperature and service life?

2019-05-28 15:15:07 JUKE CHINA ODM OEM Transformer factory Read

What is the relationship between dry Power Transformer temperature and service life?

Temperature is the concept of an external environment. The environment in which the dry-type transformer is operated is also affected and restricted by temperature. Without good temperature, it is impossible to make the dry-type transformer operate well. For the temperature of the dry-type transformer, It not only affects the operation of the dry-type transformer, but also affects the service life of the dry-type transformer. Therefore, it is necessary to correctly grasp the temperature of the dry-type transformer and operate the dry-type transformer at a suitable temperature, which is beneficial to lifting the dry The service life of the transformer. So what is the relationship between the two?
What is the relationship between dry Power Transformer temperature and service life?.jpg

1. Relationship between service life of dry transformer and insulation temperature:
Most of the power dry-type transformers use oil-paper insulation, ie, Class A insulation. For Class A insulated dry-type transformers, the absolute operating temperature of the dry-type transformer windings is 105 °C during normal operation when the ambient air temperature is 40 °C.
Practice and research have shown that if the winding can maintain a continuous temperature of 95 °C, the dry transformer can be guaranteed to have a service life of 20 years. According to the relationship between temperature and life, a so-called 8 ° C rule can be drawn: based on the life at the above temperature, the service life of the dry transformer is shortened by 1/2 for every 8 °C increase in winding temperature.
According to relevant information and practice:
When the dry transformer insulation temperature is 95 °C, the dry transformer has a service life of 20 years.
The dry transformer insulation temperature is 105 °C, and the dry transformer life is 7 years.
When the dry transformer insulation working temperature is 120 °C, the dry transformer has a service life of 2 years.
2. Correctly adjust the dry-type transformer load to make the dry-type transformer reach the ideal service life:
The insulation temperature inside the dry-type transformer is mainly related to the magnitude of the load current under the premise that the voltage is basically constant, that is, the load current is large, and the insulation temperature is high. On the contrary, the load current is small and the insulation temperature is low.
The temperature of the dry-type transformer is closely related to the service life of the dry-type transformer. Therefore, it is necessary to correctly grasp the temperature of the dry-type transformer, ensure that the dry-type transformer operates at a suitable temperature, and let the dry-type transformer play a larger role. Advantages to ensure safe and smooth operation of dry transformers!