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Choose oil filled transformer or dry type transformer?
Different cooling methods and constructions result to different usage, maintenance, and application environments. Here's a comparison of the two:
1. Oil-Type Transformer:
1) Cooling: Use insulating oil as a coolant and insulation medium. The oil circulates either naturally (through thermal convection) or with the help of pumps and heat exchangers (forced circulation) to dissipate heat generated by the transformer.
2) Construction: Have a steel sealed tank filled with oil that surrounds the windings and core.
3) Fire Safety: Oil type need special safety measures like firewalls, oil containment systems, and gas detection systems.
4) Noise: Low noise that operate quietly.
5) Maintenance: Require periodic testing of the oil quality, topping up or changing the oil when necessary, and checking for leaks.
6) Application: Suitable for outdoor installations, substations, and applications where higher power ratings and better cooling efficiency are needed.
2. Dry-Type Transformer:
1) Cooling: Rely on air for cooling of 2 types.
Natural Air-Cooled (NA): where heat is dissipated through natural convection.
Forced Air-Cooled (FA): where fans are used to enhance the airflow over the transformer's cooling surfaces.
2) Construction: The windings are exposed to the air directly or enclosed in a sealed, ventilated enclosure.
3) Fire Safety: Considered safer than oil-type transformers as they don't use flammable liquids, making them suitable for indoor installations.
4) Noise: Forced air-cooled dry-type transformers can be noisier due to the operation of cooling fans.
5) Maintenance: Require less maintenance, only need to clean or replace filters and cooling fans when needed.
6) Application: Preferred for indoor installations, low power distribution, environments with strict safety regulations, or where environmental concerns about oil spills are high.
In summary, oil filled transformer is outdoor type with high power capacity, greater efficiency and cost-effectiveness for larger installations, while dry type transformer is indoor type with less maintenance and environmental friendly.
