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

Temperature is a concept of external environment. The operating environment of ddry distribution transformer is also affected and restricted by temperature. Without good temperature, it is impossible to make dry-type transformers operate well. For the temperature of dry-type transformers, It not only affects the operation of the dry distribution 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 distribution transformer at a suitable temperature, which is conducive to improving the dry-type transformer. the service life of the transformer. So what is the relationship between the two?

1. The relationship between the service life of the dry distribution transformer and the insulation temperature:

Most of the power dry-type transformers use oil-paper insulation, that is, Class A insulation. For dry-type transformers with Class A insulation, in normal operation, when the ambient air temperature is 40°C, the limit working temperature of the dry-type transformer windings is 105°C.

Practice and research have shown that if the winding can maintain a temperature of 95 ℃ continuously, the dry-type transformer can be guaranteed to have a service life of 20 years. According to the relationship between temperature and life, a so-called 8 ℃ rule can also be derived: based on the life at the above temperature, the service life of the dry-type transformer will be shortened by 1/2 every time the winding temperature increases by 8 ℃.

According to relevant information and practice proof:

When the insulation working temperature of dry-type transformer is 95℃, the service life of dry-type transformer is 20 years.

The working temperature of dry-type transformer insulation is 105℃, and the service life of dry-type transformer is 7 years.

When the insulation working temperature of dry-type transformer is 120℃, the service life of dry-type transformer is 2 years.

2. Correctly adjust the dry-type transformer load to make the dry-type transformer reach the ideal service life:

Under the premise that the voltage is basically constant, the insulation temperature inside the dry-type transformer is mainly related to the load current, that is, the load current is large, the insulation temperature is high, and the insulation temperature is low when the load current is small.

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 to ensure that the dry-type transformer operates at a suitable temperature, so that the dry-type transformer can play a greater role. Advantages to ensure safe and smooth operation of dry-type transformers!