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Liquid Dielectric Transformer
a liquid dielectric transformer converts high voltages to a more usable source of energy, these transformers non-conductive dielectric liquids ( often use oil or mineral oil) as well as fans, to cool The use of fluid is a fast solution in reducing high-temperature hot spots in the unit’s coils, helping them last longer.
Liquid transformers are ideal for medium voltage and high-voltage applications .Not all kinds of liquid-filled transformers operate with the same cooling system. The cooling method can also vary depending on the mechanism’s power capacity. Here are the standard cooling methods in liquid transformers.
- Oil Natural Air Natural (ONAN) – For oil-filled transformers that operate at up to 30mVa.
- Oil Natural Air Forced (ONAF) – Medium voltage oil filled transformers that operate up to 60mVa uses.
- Oil Forced Air Forced (OFAF) – High-rated transformers use this mechanism of forced fluid circulation using a pump and forced air through a fan.
- Oil Forced Water Forced (OFWF) – For transformers with significantly higher capacities, this involves adding water to further aid in heat dissipation.

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The liquid filled transformers are robust and are suitable for installation indoors or outdoors in harsh environments. LV , MV, HV transformers require very little maintenance and have a long life span of up to 35 years. Liquid Filled Transformers advantages:
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