What Are Typical Impedance Values for Power Plant Transformers?

In summary, when it comes to power plant transformers, the typical inductance and impedance on the primary winding is given in Per Unit as a percentage of the nominal nameplate ratings. For internal distribution, transformers are usually a few percent, around 2 to 5 percent. The main transformer connecting the generator to the grid has an impedance of 17%, mostly inductive to minimize energy loss. Electrical system designers aim to keep voltage drops within 10% over the operating range of the plant. The main transformer for connecting the generator to the grid has a capacity of 894MVA, making even a 0.1% loss significant. The exact numbers may vary, but the guidelines provided in the reference should give a general understanding.
  • #1
Idea04
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When it comes to power plant transformers, What is the typical inductance and impedance on the primary winding?
 
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  • #2
http://www.scribd.com/doc/27073343/Transformer-Engineering
 
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  • #3
that's an excellent reference, j-rfu.

Impedance is indeed given in Per Unit, % of nominal nameplate ratings.
Transformers for our internal distribution were a few percent, 2 to 5 -ish.

Our main transformer (the one connecting generator to grid) was 17% .
The impedance will be mostly inductive so as to not waste kilowatts as heat.
Electrical system designers spend a lot of time optimizing voltage drops so everything stays within ~10% over operating range of plant.

The main transformer connecting generator to grid was 894MVA so you can see what 0.1% loss would be in kw - almost a megawatt . It's worth making the big ones highly efficient.

Sorry i just don't remember the exact numbers but the guidelines in that reference should give you a feel.

old jim
 

What is the purpose of a power plant transformer?

A power plant transformer is used to step up or step down the voltage of electricity produced by a power plant. This allows for efficient transmission and distribution of electricity to homes and businesses.

How does a power plant transformer work?

A power plant transformer works by using electromagnetic induction to transfer electrical energy from one circuit to another. It has two or more coils of wire, called windings, that are wound around a core. These windings are connected to different circuits, and when electricity flows through one winding, it creates a magnetic field that induces a current in the other winding.

What are the different types of power plant transformers?

The two main types of power plant transformers are step-up transformers and step-down transformers. Step-up transformers increase the voltage of electricity, while step-down transformers decrease the voltage. Other types include autotransformers, instrument transformers, and distribution transformers.

What are the key components of a power plant transformer?

The main components of a power plant transformer include a core, windings, insulating materials, and a tank. The core is typically made of laminated steel to reduce energy losses, while the windings are made of copper or aluminum to conduct electricity. Insulating materials, such as oil or gas, are used to insulate the windings and the core. The tank is a protective enclosure that houses all the components.

How do power plant transformers impact the environment?

Power plant transformers can have both positive and negative impacts on the environment. On one hand, they enable the efficient transmission and distribution of electricity, reducing the need for additional power plants. On the other hand, the production and disposal of transformers can contribute to air and water pollution. Steps are being taken to make transformers more energy efficient and environmentally friendly.

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