What is the factor of transformer?

Voltage Ratings, Ratio, and Method of Connection (Delta or Wye) Voltage Taps. Typical Impedance Values for Power Transformers. Insulation Temperature Ratings.

Which factors affect life of transformer?

The life of a transformer is defined as the life of the paper insulation [1]. The paper insulation deteriorates with several factors, primarily including temperature, moisture content, and oxygen content.

What are the external factors for transformer protection?

In addition to fault conditions within the transformer, abnormal conditions due to external factors result in stresses on the transformer….External factors

• Overloading,
• System faults,
• Overvoltages, and.
• Under-frequency operation.

What is the impedance in transformer?

The per-unit impedance describes that percentage of the rated voltage required to produce full load current while the transformer output is shorted. The lower the impedance, the lower the voltage required to produce full load current.

What should the K factor of a transformer be?

K-factor rating ranges from 1 to 50. Transformers having K-factor of 1 can handle linear loads only and those rated 50 can withstand harsh harmonics. For attained better K-factor ratings, transformers should be made capable of withstanding extra heats caused due to harmonics.

How is the de rating of a transformer calculated?

To estimate the de-rating of the transformer, the load’s K-factor may be used. This factor is calculated according to the harmonic spectrum of the load current and is an indication of the additional eddy current load losses. It reflects the excess losses experienced in a traditional wire wound transformer.

What are the factors that affect transformer efficiency?

Key factors to consider that are related to efficiency include transformer loading, the presence of system harmonics, K-factor, and temperature rise. Another major movement in the world of transformer efficiency centers on the U.S. Department of Energy (DOE) federal efficiency regulations.

What should be considered when selecting a transformer?

Best practices. There are many factors that should be considered when selecting a transformer, namely transformer loading, the presence of system harmonics, K-factor, and temperature rise. Federal efficiency regulations and a cost and payback analysis are also considerations that should be taken into account.