2.23 Cooling Methods of a Transformer

Cooling Methods of a Transformer

Increasing the cooling rate of a transformer increases its capacity. Cooling methods must not only maintain a sufficiently low average temperature but must prevent an excessive temperature rise in any portion of the transformer (i.e., it must prevent hot spots). For this reason, working parts of large transformers are usually submerged in high-grade insulating oil. This oil must be kept as free as possible from moisture and oxygen, dissolved combustible gases, and particulates.

Ducts are arranged to provide free circulation of oil through the core and coils; warmer and lighter oil rises to the top of the tank, cooler and heavier oil settles to the bottom. Several methods
have been developed for removing heat that is transmitted to the transformer oil from the core and windings (figure 21).

Figure 21 – Cooling Methods of a Transformer

Figure 21 – Cooling Methods of a Transformer

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обновлено: September 29, 2016 автором: dannik