Cast Resin Transformer VS Oil Transformer
Transformer Type | Cast Resin Transformer | Oil Immersed (Liquid Filled) Transformer |
Insulating Material | Epoxy resin | Oil |
Temperature Rise | Lower compared to oil immersed transformer | Higher compared to cast resin transformer |
Fire Safety | Self-extinguishing and non-flammable | Fire hazard due to oil |
Environmental Friendliness | Environmentally friendly, no oil spillage risk | Risk of oil leakage and contamination to soil and water bodies |
Maintenance | Maintenance-free, no topping up of oil or replacement of gaskets | Regular maintenance required, topping up of oil and replacement of gaskets |
Installation | Lightweight and compact, can be installed indoor and outdoor | Heavy and bulky, usually installed outdoor with safety measures |
Cost | Higher initial cost compared to oil transformer | Lower initial cost compared to cast resin transformer |
Cast resin transformers and oil-immersed transformers have been used in low and high voltage power distribution systems for many years. Both technologies have their advantages and limitations.
The use of cast resin transformers has grown in popularity due to its thermal and mechanical stability, reliability, and fire resistance properties. The epoxy resin has excellent insulation properties and does not degrade or age over time, making it a maintenance-free option. They are particularly suitable for indoor installation, as they generate less heat resulting in lower temperature rise, and are more environmentally friendly as there is no risk of oil leakage.
Oil-immersed transformers, on the other hand, have been the most commonly used transformers since the early 20th century. The oil acts as an insulating and cooling medium, but it is also a fire hazard and can cause environmental pollution if they leak or spill. Regular maintenance is required to ensure the oil level is maintained, and the gaskets are replaced every few years. They are generally installed outdoors, in a fireproof enclosure, as they have a higher temperature rise and produce more heat.
In summary, cast resin transformers are more suitable for indoor installation, are maintenance-free, and have better fire and environmental safety features. However, they have a higher initial cost compared to oil transformers. Oil transformers, on the other hand, are less expensive but require regular maintenance, have higher temperature rise and risk of environmental pollution due to oil leakage. The choice of transformer will ultimately depend on the specific needs of the application and the available budget.
