Transformer heating and cooling process
Transformer belt the load in its core, coil, generating losses. These losses are converted to heat, and emits heat, the temperature was gradually increased, the coil or between the core and the surrounding medium, to produce a temperature difference. Heat from the coil, core the divergence to coal. Thus, part of the heat so that the transformer temperature increases, another part of the heat is dissipated to the coal quality. The temperature was gradually increased, the accumulation of heat within the unit time is gradually reduced, while gradually increasing the heat. Final temperature no longer rises, all the heat dissipated into the surrounding coal.
Power transformers are generally long-term continuous operation. In the design of this transformer, the calculation of the stability of the temperature rise under its rated load.
Stability under thermal conditions, all the heat generated in the coil and the iron core are diverging to QUALITY go. The calories walking path is very complex, for oil-immersed power transformers, can be divided into the following sections:
1 from the middle of the coil or core flow to the outer surface thereof, it is to rely on conduction of;
2 to the oil from the outer surface of the coil or core, and then to the tank wall, which rely on convection.
3 from the tank wall into the air, this is the role of relying on convection and radiation.