# In which type of transformer tertiary winding is used?

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## Where are tertiary winding used on a transformer?

A “Tertiary” is a third winding added to a two winding transformer. Also called “Stabilizing” winding – stabilizes neutral point voltage. Stabilizing winding also helps in reduction of third-harmonic voltages in the line, thus reducing harmonic related issues, e.g. telephonic interference or heating.

## What is tertiary winding of transformer?

An additional winding along with the primary and secondary windings in a transformer in order to provide path for the harmonics produced in the transformer. Such transformers are called Tertiary transformers or Three winding transformers.

## Which type of winding is used in three phase transformer?

The two most commonly used three-phase winding configurations are delta and wye, named after the Greek and English letter that each resembles. In a delta configuration, the three windings are connected end-to-end to form a closed path.

## Which type of current is allowed through tertiary winding?

Explanation: Tertiary winding of the three-winding transformer is generally delta connected which is helpful in reducing the impedance offered to the zero sequence currents thus, it allows a larger earth-fault current to flow for proper operation of protective equipment.

## Why tertiary winding is grounded?

RE: Grounding of stabilizing Tertiary winding.

Without grounding one corner the voltage can go floating and exceed winding BIL causing uncontrolled flashover. The practice with tertiary winding is usually to ground one corner and the other two corners are left open with a shunt surge arrestor to ground.

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## What is the advantage of using tertiary winding in transformer?

Advantages of Using Tertiary Winding in Transformer

It reduces the unbalancing in the primary due to unbalancing in three phase load. It redistributes the flow of fault current. Sometime it is required to supply an auxiliary load in different voltage level in addition to its main secondary load.

## What is a tertiary reactor?

Four 45 MVAR reactor banks are connected from each of the bank’s tertiary buses. These reactors are switched by 12 kV vacuum breakers on the neutral side of the reactors. The tertiary reactors provide an operational benefit by allowing the system operators to fine-tune the reactive power mix to control system voltage.

## What is a buried tertiary winding?

To accommodate and mitigate the propagation of harmonics, a third winding connected in a delta configuration can be “buried” as a tertiary (stabilizing) winding. The tertiary winding provides a circulating path for the harmonics that are produced with the power frequency.