There are different varieties of transformers in the market right now that serve different purposes. From dry-type to oil-type, the options for what kind of transformer you use in your facility are aplenty.
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But when it comes to oil-type transformers, there are some key things you need to know before deciding whether or not they're the right choice for you. Oil-type transformers differ from other variants as they rely on oil to fulfill an important role in their overall functioning and longevity.
At Daelim, we're transformer experts and here to help you make the best decision for your facility. But, just like our drive to provide the best quality transformers, we also want to spread nothing but the most accurate information about them.
This article will discuss everything you need to know about oil-type transformers. To help you better understand oil-type transformers, we've compiled a list of answers to some of the most frequently asked questions about them.
Table of contents 1. What is an Oil Type Transformer?An oil-type transformer is a kind of transformer that uses oil as a cooling and insulating medium. The core and coils of an oil-type transformer are immersed in oil, which helps to cool the transformer and provides insulation.
Oil-type transformers circulate through ducts in the coils and around the core assembly. The movement of oil is caused by convection generated by the heat produced by the transformer.
Oil-type transformers are widely used in power distribution and electrical substations because they cool the transformer efficiently. Additionally, oil-type transformers have a longer lifespan than other transformers and require less maintenance.
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You should consider getting an oil-type transformer if you fall under one of the following categories:
An oil transformer offers a lot of advantages that make it an enticing option when it comes to selecting a transformer. But at the same time, it also has its fair share of disadvantages that outweigh the pros and cons of using an oil-cooled transformer.
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Knowing and understanding the advantages and disadvantages is important before deciding whether to use an oil-cooled transformer. That way, you can make an informed decision that is best for your needs and requirements. With that said, here are the advantages and disadvantages of using an oil-cooled transformer:
As the name implies, oil-cooled transformers use insulating oil to cool the transformer. The oil in oil-cooled transformers effectively cools the transformer because it has a high heat capacity. This means that the oil can absorb a large amount of heat before it gets hotter.
The oil used in oil-cooled transformers also has a high thermal conductivity. As a result, the oil can efficiently transfer heat from the transformer to the surrounding air. These two properties make oil an effective and efficient cooling agent for transformers.
Reading more: Transformer Efficiency: The Ultimate FAQs Guide
Oil-cooled transformers are also safe and reliable to use. This is because the oil used in these transformers is non-flammable and has a high flash point. This means that the oil will not catch fire easily and is less likely to cause an explosion.
In addition, oil-cooled transformers are also less likely to fail than other types of transformers. This is because the oil used in these transformers acts as a shock absorber that cushions the components of the transformer in case of an electrical fault.
Another advantage of using an oil-cooled transformer is its long lifespan. This is because the oil used in these transformers acts as a lubricant that reduces friction between the moving parts of the transformer.
The oil also protects the transformer from corrosion and rust. This means oil-cooled transformers are less likely to experience premature failure due to corrosion or rust.
Oil-cooled transformers, especially the ones manufactured by Daelim, are also durable and can withstand a lot of wear and tear. This is because the oil used in these transformers acts as a sealant that prevents water and other contaminants from entering the transformer.
The oil used in oil-cooled transformers also has a high viscosity. This means that the oil will not leak easily from the transformer. That way, you can be sure that your transformer will not develop any leaks even after years of use.
Oil-cooled transformers are also the best option for high-voltage applications. This is because the oil used in these transformers can withstand high voltages without breaking down.
Oil-cooled transformers are also less likely to experience a dielectric breakdown. This means that these transformers can safely handle high voltage without the risk of failure. As a result, oil-cooled transformers are the preferred choice for high-voltage applications.
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One of the main disadvantages of using an oil-filled transformer is its high initial cost. This is because oil-cooled transformers are more complex and require more materials than other transformers.
Oil Type Transformer needs to have oil-removing pits and accident oil pools when installing. When a fuel injection or explosion occurs, the oil of the transformer will be unloaded to the oil-removing pit and then flows to the accident oil pool. Avoid greater losses due to the spread of transformer explosion fires.
As a result, oil-cooled transformers are more expensive to manufacture. However, their long lifespan and durability offset the high initial cost of oil-cooled transformers.
Another disadvantage of using an oil-cooled transformer is that it requires regular maintenance. This is because the oil used in these transformers needs to be replaced regularly.
Oil-cooled transformers also need to be cleaned regularly to prevent the build-up of dirt and debris. As a result, oil-cooled transformers require more maintenance than other transformers.
Since oil is the main cooling agent used in oil-cooled transformers, these transformers are highly flammable. If an oil-filled power transformer catches fire, it can cause much damage. That's why oil-cooled transformers need to be installed in areas where there is no risk of fire.
That said, oil-cooled transformers are equipped with safety features that prevent them from catching fire easily. So, you don't need to worry about the safety of oil-cooled transformers as long as they are installed and used correctly.
Another disadvantage of using an oil-cooled transformer is that it creates a dirty environment. This is because the oil used in these transformers can leak and cause contamination. That's why this type of transformer requires high maintenance.
Oil-cooled transformers also produce a lot of heat when they are in use. As a result, oil-cooled transformers can make the environment around them very hot and uncomfortable.
Daelim Transformer can provide environmentally friendly vegetable oil as transformer oil. Plant oil has environmental protection, fire prevention, and high characteristics. Therefore, you don't have to worry about the environmental pollution problem caused by the transformer.
Read my article on: What is the difference between mineral oil and vegetable oil？
Because they can easily catch fire and produce a lot of heat, oil-cooled transformers are unsuitable for indoor use. That's why these transformers are mostly used in industrial applications.
If you need to use an oil-cooled transformer indoors, ensure the area is well-ventilated and there is no fire risk. That way, you can use an oil-cooled transformer safely indoors.
Oil-cooled transformers are mostly used in industrial applications. This is because these transformers can handle high voltages and don't require much maintenance.
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That said, oil-cooled transformers are also used in commercial applications. This is because oil-cooled transformers are more durable than other types of transformers and can last for a long time.
Oil-cooled transformers are mostly used in power plants(Including renewable energy). This is because oil-cooled transformers can handle high voltages and don't require much maintenance.
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Examples of industrial sectors that benefit from using oil-cooled transformers are the following:
An oil-type transformer consists of the following parts:
The core of an oil-type transformer is made of high-quality steel. The steel used in the core of an oil-type transformer is different from the steel used in other types of transformers.
The steel used in an oil-type transformer's core is designed to resist magnetic fields. That's why the core of an oil-type transformer is made of high-quality steel.
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The coils of an oil-type transformer are made of copper or aluminum. The coils are responsible for generating the magnetic field used to transform the voltage.
An oil-type transformer's coils and core are covered with insulating materials. The insulating materials used in oil-type transformers differ from those used in other types of transformers.
The insulating materials used in oil-type transformers are designed to resist heat. That's why these materials are used in oil-type transformers.
The oil used in oil-type transformers differs from the oil used in other transformers. In addition, the oil used in oil-type transformers is designed to be resistant to heat.
The oil used in oil-type transformers is also designed to be a good insulator. That's why oil used in oil-type transformers differs from the oil used in other transformers.
The tank of an oil-type transformer is made of high-quality steel. The tank is responsible for holding the transformer oil.
The tank of an oil-type transformer also has a cooling system. The cooling system is used to cool the transformer oil.
The tap changer is used to change the voltage of an oil-type transformer. The tap changer is located on the side of the tank.
The tap changer is used to change the voltage of an oil-type transformer. The tap changer is located on the side of the tank.
Daelim can provide on-load tap and no-load tap Changer. According to customer needs, Chinese brands with price advantages can also be provided, and brands such as MR, and Qualitrol with international visibility can be provided.
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The bushings are used to connect the transformer to the power supply. Generally, the bushings are located on the top of the tank.
However, for the Oil Type Transformer designed and produced by Daelim, bushings can be top or side, specifically according to your use scenario and project. Bushings' sealing is very good to prevent oil leakage.
The ventilation system is used to cool the transformer oil. The ventilation system is located on the side of the transformer.
The ventilation system is used to cool the transformer oil. The ventilation system is located on the side of the transformer.
If you notice oil on the ground near your transformer, it could be a sign that your transformer is leaking oil. You should consider checking the level of oil in your transformer's tank.
If the oil level in your transformer's tank is low, it could be another sign that your transformer is leaking oil. Consider checking the condition of the oil in your transformer's tank.
If the oil in your transformer's tank is dark or cloudy, it could be another indication of a potential oil leak.
Dry-type transformers use air to cool the transformer. Oil-type transformers use oil to cool the transformer.
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Oxidation is a common problem with transformer oil. That's why it's important to regularly change the oil in your transformer. The frequency of oil changes will depend on your transformer type.
For instance, a 132kV oil-cooled transformer will require an oil change yearly. On the other hand, oil-cooled transformers that are lower than 132kV require an oil change once every two years. For transformers above 132kV, the oil should be changed in a 2-year interval.
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It's also important to note that the frequency of oil changes will depend on the operating conditions of the transformer. For example, if the transformer is operated at higher temperatures, the oil will degrade faster and must be changed more often.
Now that you know everything there is to know about oil-type transformers, you can make an informed decision about whether or not this type of transformer is right for your needs. If you have any further questions about oil-type transformers, contact Daelim right away.
Oil transformers use mineral oil as the heat dissipation and insulation medium. This is a widely used electrical equipment in the world. Most of the transformers in today's power transmission systems are oil-cooled. There are two main types of oil transformers: Open-type transformers (Conservator type transformers) and Sealed-type transformers (Hermetically sealed type transformers).
Cooling oil according to the principle of heat generated by the coil and magnetic core during operation will transfer to the oil. The temperature of the oil will spread out to the outside through the transformer's metal shell.
Oil-immersed transformers consist of the magnetic core, windings and bushings. The magnetic core provides a path for magnetic flow. Windings create a magnetic field and consist of a conductor coil, wrapped around the core and insulated with press board barriers and screens. The thickness of the winding insulation increases with voltage. Bushings connect transformer windings to a substation. A characteristic feature of an oil-immersed transformer is the oil conservator. It simplifies operation by monitoring the oil level in a tank and providing space for thermal expansion of the oil.
Moreover, the minimum net distance between the outer profile of the fuel oil-immersed transformer and the wall and door of the transformer room also has strict distance requirements. The various civil structures, fire barriers and storage tanks of oil-immersed power transformer substations are designed because of the flammability and liquidity of oil. In addition, "when the transformer room is located in the building, the door shall be a Class A fire door." In this way, the construction investment designed to prevent fire in each substation is naturally much larger.
1. The cost of procuring an oil transformer is usually 1.5 to 2 times lower than a dry transformer for the same capacity.
2. Dry transformer' epoxy resin has poor heat dissipation performance than mineral oil.
In general, the dry transformer's heat dissipation is inferior to that of the oil transformer, so the capacity of the dry transformer usually only meets the need for power distribution from the intermediate station to the end-consumption site. Also, on the grid system, oil transformers are more versatile (including transmission and distribution transformers).
3. The dry-type transformer is usually suitable for voltages below 35kV, while oil-immersed are unlimited.
The temperature monitoring of the dry transformer depends on the temperature sensor mounted inside the machine's body, so the obtained temperature is the temperature of a particular location, the temperature reflected by the screen is not the exact mean temperature. The transformer insulation oil conducts heat relatively evenly. The temperature reflected by the monitor can be considered the average temperature.
Because of the monolithic casting structure of the dry transformer, compared with the ability to repair, recover, utilize, the oil transformer is more dominant. The insulating material of the machine dries out over time will age, and defects will accumulate. In the event of a failure, the dry transformer will be rejected entirely. The dry machine components, including copper (or aluminum) and the magnetic core, are nearly non-recyclable.
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