What are the advantages and disadvantages of dry type (Oil less) transformers ?
Minimal maintenance Dry-type transformers require minimum maintenance and provide long years of trouble-free service. Fire proof vaults and toxic gas venting systems are not required. With high impulse strength insulation systems, they will coordinate with all electrical system designs. Conservatively designed, the sound level is very low, making the Spang transformer desirable for indoor applications in commercial buildings. Significant advantages over liquid filled designs The dry-type transformer offers an excellent solution wherever environmental problems are a concern. Liquid cooled transformers, whether they are cooled with oil or a fire resistant liquid dielectric, can present an ecological problem in either their use or eventual disposal of the liquid. Dry-type transformer insulation systems now give performance equal to liquid filled designs for distribution voltages of 15KV or even higher. Dry-type transformers require no venting of toxic gases, an important safety considerat