{"id":1804,"date":"2026-09-01T11:57:35","date_gmt":"2026-09-01T03:57:35","guid":{"rendered":"http:\/\/www.sovinelec.com\/?p=1804"},"modified":"2026-09-01T11:57:36","modified_gmt":"2026-09-01T03:57:36","slug":"dry-type-vs-oil-immersed-transformer-how-to-choose","status":"publish","type":"post","link":"https:\/\/www.sovinelec.com\/pt\/2026\/09\/01\/dry-type-vs-oil-immersed-transformer-how-to-choose\/","title":{"rendered":"Transformador de tipo seco vs. transformador imerso em \u00f3leo: como escolher o mais adequado para o seu projeto"},"content":{"rendered":"

Dry-type and oil-immersed transformers can both provide reliable voltage conversion, but they use different insulation and cooling systems. A practical selection should consider installation location, fire and environmental requirements, load profile, maintenance resources, enclosure design and applicable standards.<\/p>\n

Dry-Type vs Oil-Immersed Transformer: Key Differences<\/h2>\n
\n\n\n\n\n\n\n\n\n\n
Selection point<\/th>\nDry-type transformer<\/th>\nOil-immersed transformer<\/th>\n<\/tr>\n<\/thead>\n
Insulation and cooling<\/td>\nAir-cooled windings, often cast-resin or non-encapsulated construction<\/td>\nCore and windings immersed in insulating liquid<\/td>\n<\/tr>\n
Typical location<\/td>\nBuildings, electrical rooms, commercial facilities, industry and marine applications with a suitable enclosure<\/td>\nOutdoor substations, utility distribution, industrial plants and pad-mounted systems<\/td>\n<\/tr>\n
Fire and environmental planning<\/td>\nNo insulating-oil containment system; enclosure, ventilation and fire classification still matter<\/td>\nFluid type, containment, fire separation and local environmental rules must be considered<\/td>\n<\/tr>\n
Maintenance focus<\/td>\nCleaning, ventilation, connections, insulation condition and temperature<\/td>\nOil condition, sealing, gauges, bushings, cooling surfaces and connections<\/td>\n<\/tr>\n
Specification focus<\/td>\nTemperature rise, insulation class, enclosure, climatic\/environmental\/fire class<\/td>\nFluid, tank construction, cooling method, accessories and protection<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Choose a Dry-Type Transformer When<\/h2>\n

A dry-type transformer is often preferred when equipment will be installed inside or close to occupied facilities and the project wants to avoid liquid-insulation containment. Cast-resin windings provide mechanical and environmental protection, while open-wound designs can suit controlled indoor conditions. Ventilation, ambient temperature, altitude and enclosure rating must still be checked.<\/p>\n

Available configurations include the SCBH15\/17\/19 amorphous-alloy dry-type transformer<\/a>, the SGB12 H-class non-encapsulated transformer<\/a> and the SCB three-dimensional core transformer<\/a>.<\/p>\n

Choose an Oil-Immersed Transformer When<\/h2>\n

Oil-immersed transformers are widely used in utility and industrial distribution because the insulating liquid supports heat transfer and compact high-capacity designs. They are common in outdoor substations, overhead networks and pad-mounted systems. The project should define the insulating fluid, tank protection, site containment and inspection plan.<\/p>\n

For conventional distribution duties, review the three-phase oil-immersed distribution transformer<\/a> or the ZGS Series II pad-mounted transformer<\/a>.<\/p>\n

Compare Efficiency at the Actual Load<\/h2>\n

Transformer type alone does not determine efficiency. Buyers should compare guaranteed no-load loss, load loss, impedance and temperature rise at the specified rating and expected load profile. IEC TS 60076-20 provides methods for evaluating transformer energy performance, while U.S. projects may also need to meet current Department of Energy requirements.<\/p>\n

Information to Send Your Supplier<\/h2>\n