Can we use water instead of oil in transformer?

Can we use water instead of oil in transformer?

Thus we see that even though the Thermal Conductivity of water is higher than that of Transformer oil but due to lower Boiling Point and low Dielectric Strength, water is not suitable for cooling of Transformer instead of Oil.

What liquid is used to cool a transformer?

In liquid filled transformers, dielectric fluid is used to cool the windings and provide optimal performance in the following manner. From the bottom of the tank where the dielectric fluid is at it’s lowest or “bottom” temperature, the fluid flows vertically up the winding ducts and is heated by the windings.

Why is oil used to cool transformers?

Transformer oil is a mineral based oil that is commonly used in transformers for its chemical properties and dielectric strength. This oil in your transformer acts as an insulator and a cooling agent. The acid will form sludge which settles on the windings of the transformer resulting in reduced heat dissipation.

Which oil is used in transformer for cooling purpose?

Naphthenic mineral oil
Naphthenic mineral oil has long been the most preferred insulating liquid for power transformer insulation because it has a good pouring point at low temperatures, good thermal cooling capacity, low cost, high efficiency and availability on the transformers market [1, 2, 3, 7].

What happens if a transformer gets wet?

The potential for serious damage to the transformer at these levels of moisture is well known and traditionally the reason for dehydration. The paper becomes scarred by electrical phenomena that occur in the presence of moisture, such as flashovers between windings, treeing, and creeping discharges.

What happens when water gets into a transformer?

Water enters into the transformer oil over time, which reduces the oil’s dielectric (insulation) properties. As the transformer becomes wetter, it decays even faster, which increases the risk of flashover (arcs/sparks), should the temperature rise to 90 c.

What is cooling method of transformer?

By Air Natural method the generated heat in the transformer is cooled by the circulation of natural air. When the temperature of the transformer becomes higher as compared to the temperature of the surrounding air, thus by the process of natural convection, heated air is replaced by the cool air.

How many cooling system does a transformer have?

The following two transformer cooling methods are adopted in dry-type transformers. Air Natural (AN) cooling – Cooled by surrounding air. Heat transfer by natural convection. Air Forced (AF) cooling – Forced sir circulation using fans and blowers.

What is leakage flux in transformer?

Leakage flux is defined as the magnetic flux which does not follow the particularly intended path in a magnetic circuit. When a current is passed through a solenoid, magnetic flux is produced by it.

Why silica gel is used in transformer?

Many companies that operate in the power generation sector attach silica gel breathers to the conservators that are used in oil-filled transformers. The main purpose of this addition is to remove moisture or water vapor content from the air used by the transformer to breathe.

How is an oil-immersed transformer cooled?

Oil-immersed type transformer is cooled by the oil-air cooling method and oil-water cooling method. Natural convection process is used for this type of cooling. The assembly of the core and windings are placed in the oil-immersed tank.

Why is it important to remove heat from a transformer?

Thus, proper removal or treatment of heat is necessary for the efficient working, longer life and higher efficiency of the transformer. The various coolants used for the cooling purpose of the transformer are air, synthetic oils, mineral oils, gas, water.

What are the different types of transformer cooling methods?

Based on the coolant used the cooling methods can be classified into: 1. Air cooling (Dry type transformers) 2. Oil cooling (Oil immersed transformers) 3. Oil and Water cooling (For capacity more than 30MVA) 1. Air Cooling (Dry Type Transformers)

Why is the pressure of oil higher than water in transformer?

The level and pressure of the oil are always kept higher than that of water so that if any leakage occurs in the system the oil mixes with the water, but water does not get mixed up with the oil. This type of method is suitable for large capacity of the transformer having rating as several hundred MVA or where banks of transformers are installed.