Selection of dry-type transformer products

Distribution transformers are one of the important pieces of equipment in the power supply and distribution systems of industrial and mining enterprises and civil buildings. They reduce the 10-6kV or 35kV network voltage to the 230/400V bus voltage used by users. These products are suitable for AC 50 (60) Hz, with a maximum three-phase rated capacity of 2500kVA (maximum single-phase rated capacity of 833kVA; single-phase transformers are generally not recommended).

When there are a large number of primary or secondary loads, it is advisable to install two or more transformers. When any one transformer is disconnected, the capacity of the remaining transformers can meet the power consumption of the primary and secondary loads. Primary and secondary loads should be concentrated as much as possible and not too dispersed.

When the seasonal load capacity is large, it is advisable to install a dedicated transformer. For example, air conditioning chiller loads and heating electric heat loads in large civil buildings.

When the concentrated load is large, it is advisable to install a dedicated transformer. Examples include large heating equipment, large X-ray machines, and electric arc furnaces.

When the lighting load is large or the use of a shared transformer for power and lighting severely affects lighting quality and bulb life, a dedicated lighting transformer may be installed. Under normal circumstances, a shared transformer is used for power and lighting.