What is OFAF in transformer?

What is OFAF in transformer?

OFAF stands for oil forced/air forced. It describes how an oil type transformer is cooled by forced movement of both air and oil to aid in heat dissipation. It’s a compact, highly effective cooling method for a range of equipment.

What is Onan and ONAF?

Oil Natural Air Natural (ONAN) Oil Natural Air Forced (ONAF) Oil Forced Air Forced (OFAF)

What are the types of transformer cooling?

Cooling Methods of a Transformer

  • Oil Natural Air Natural (ONAN)
  • Oil Natural Air Forced (ONAF)
  • Oil Forced Air Forced (OFAF)
  • Oil Forced Water Forced (OFWF)

What does KNAN mean?

KNAN is a transformer that uses less flammable non-mineral oil such as silicone oil, synthetic ester or natural ester (FR3) as the insulating fluid with natural air convection cooling. KNAF has same transformer oil as KNAN but with external forced air cooling.

How is a transformer cooled?

There are two ways of cooling the transformer: First, the coolant circulating inside the transformer transfers the heat from the windings and the core entirely to the tank walls and then it is dissipated to the surrounding medium.

What is Dyn11?

Dyn11 is vector group notation of tansformer.It means LV winding,which is star connected (written in small letters means LV side and vice versa)is 30 degrees lagging by HV winding which is delta connected.In India we go for +-30 deg connection of transformer.

What are the ideal transformers?

Definition: A transformer that doesn’t have any losses like copper and core is known as an ideal transformer. In this transformer, the output power is equivalent to the input power. The efficiency of this transformer is 100%, which means there is no loss of power within the transformer.

How does oil cool a transformer?

Oil in contact with the surface of windings and core gets heated up and moves towards the top and is replaced by the cool oil from the bottom. The heated oil transfers its heat to the transformer tank through convection and which in turn transfers the heat to the surrounding air by convection and radiation.

What is FR3 transformer oil?

Envirotemp® FR3 fluid is a Fire Resistant Natural Ester dielectric coolant specifically formulated for use in distribution and power transformers where its unique environmental, fire safety, chemical, and electrical properties are advantageous.

What is ODAF cooling?

Product Description. ODAF Cooling of Transformer ODAF or oil directed air forced cooling of transformer can be considered as the improved version of OFAF. Here forced circulation of oil directed to flow through predetermined paths in transformer winding.

What does OFAF stand for in transformer category?

OFAF stand for Oil Forced Air Forced cooling.For transformer above 60 MVA rating, ONAF cooling system is not adequate and OFAF cooling system is used. In large rating transformer, more heat is generated, and convection circulation of transformer oil is replaced with forced circulation.

How does the OFAF cooling system work on a transformer?

OFAF Cooling of Transformer. The heat dissipation rate can be still increased further if this oil circulation is accelerated by applying some force. In OFAF cooling system the oil is forced to circulate within the closed loop of transformer tank by means of oil pumps. OFAF means “Oil Forced Air Forced” cooling methods of transformer.

What’s the difference between OFAF and Onan transformer?

OFAF means Oil Forced Air Forced (The oil and air will both be circulated through fans). This will increase the capacity of power transformer by 66% of the base capacity. ONAN means Oil Natural Air Natural Capacity. ONAF means Oil Natural Air Forced Capacity. OFAF means Oil Forced Air Forced Capacity.

What are the temperature limits for OFAF Transformers?

Our OFAF transformer coolers operate in ambient temperatures from -40 o C to +50 o C, with optional -45 o C and +60 o C limits available to order. The cooling element is made from materials suitable for the local environment and designed to ensure high levels of heat transfer.

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