How to judge the quality of dry-type transformers

How about the quality of dry-type transformers is in the following points.
Low noise, environmental protection, energy saving. Low loss core, stacked transformer core joint, foil coil structure, scientific noise research, environmental protection regulations, new materials, new technology, new technology application, electronic computer reliability design, its development trend is the future dry-type transformer environmental protection, energy saving and steady development can be promoted.
Sales price electrical products, especially dry-type transformers, operational reliability is important. That reliability is related to the safety of electricity, and cannot be ignored.
Verification of environmental protection characteristics. Great importance is attached to energy conservation and environmental protection. In the case of dry-type transformers, according to HD 464 of the European standard, scientific research on gas-phase dry-type transformers (C 0, C 1, C 2), environmentally friendly type (E 0, E 1, E 2), characteristics of fireproof materials and resistance to corrective nuclei (F 0, F 1, F 2) is carried out.
Dry-type transformers are mainly used in large, medium and small load management centers. It is a residential area of a large city, a mine of factories, etc. As the charge in large cities increases, so does the capacity of dry-type transformers. Therefore, when selecting a dry-type transformer, the size of the volume must be fully considered.