Which is the cause for deterioration of transformer?

The most predominant factors responsible for causing deterioration of transformer oil and subsequently failure of transformers are: 1) Development of internal pressure in the oil. 2) The rise in temperature during operating conditions. 3) Frequent change in operating voltage levels.

What is the main cause of transformer winding insulation failure?

The main reasons that cause this fault are the improper repair, poor maintenance, corrosion, manufacturing deficiencies, vibration and mechanical movement within the transformer.

What is interleaved winding in transformer?

[¦in·tər¦lēvd ′wīn·diŋz] (electricity) An arrangement of winding coils around a transformer core in which the coils are wound in the form of a disk, with a group of disks for the low-voltage windings stacked alternately with a group of disks for the high-voltage windings.

What is the function of breather in a transformer?

The breather is used in the transformer to filter out the moisture from the air. Breather consists of silica gel which absorbs moisture from the air. Conservator tank present at the top of the transformer which allows adequate space for expansion of oil.

What is sludge in transformer oil?

Sludge is a precipitate or mixture of impurities and acid in transformer oil. The impurities are in the form of semi-solid in a transformer oil. Increasing of moisture in transformer oil can form sludge due to the reason of reducing the dielectric strength and corrosion. Acid can damage the windings of the transformer.

What are the causes of low value of insulation resistance in power transformer?

Factors affecting on IR value of Transformer

• surface condition of the terminal bushing.
• quality of oil.
• quality of winding insulation.
• temperature of oil.
• duration of application and value of test voltage.

What is purpose of winding resistance test in transformer?

The main purpose of this test is to check for gross differences between windings and for opens in the connections. Measuring the resistance of transformer windings assures that each circuit is wired properly and that all connections are tight.

What is helical winding in transformer?

Helical winding is otherwise known as spiral winding. It is a variant of multilayer winding and consists of several conductors in parallel to form a single turn. The parallel conductors are wound along the axial direction with spacers inserted between the adjacent turns. This type of construction resembles a corkscrew.

Which of the following is the main advantage of auto transformer over a two winding transformer?

An autotransformer compared to its two-winding counterpart has a higher operating efficiency. Explanation: The losses are less in autotransformer compare to two-winding transformer. Thus, for the given same input to autotransformer as that of two-winding transformer more output will be available to secondary side.

What is breather and why it is required?

Transformer Breather Helps to Prevent Atmospheric Moisture and Reduce Maintenance Costs. During the breathing cycle of a transformer, it is crucial to prevent atmospheric moisture from entering the transformer, which can contaminate the oil and cause damage over time to internal parts.