What is a transformer and how does it work?
A transformer is an electrical apparatus designed to convert alternating current from one voltage to another. It can be designed to “step up” or “step down” voltages and works on the magnetic induction principle. A transformer has no moving parts and is a completely static solid state device, which insures, under normal operating conditions, a long and trouble-free life. It consists, in its simplest form, of two or more coils of insulated wire wound on a laminated steel core. When voltage is introduced to one coil, called the primary, it magnetizes the iron core. A voltage is then induced in the other coil, called the secondary or output coil. The change of voltage (or voltage ratio) between the primary and secondary depends on the turns ratio of the two coils.
What is the difference between Power Transformers and Distribution Transformers?
Power transformers are used in transmission network of higher voltages for step-up and step down application (400 kV, 200 kV, 110 kV, 66 kV, 33kV) and are generally rated above 200MVA.
Distribution transformers are used for lower voltage distribution networks as a means to end user connectivity. (11kV, 6.6 kV, 3.3 kV, 440V, 230V) and are generally rated less than 200 MVA.
Why are transformers rated in kVA not kW?
Generally, there are 2 kind of losses in a transformer; Iron losses and copper losses. Since iron losses depend on voltage and copper losses on current, the total losses depend on voltage and current, and no power factor is involved. Transformers are rated in kVA as kW would include power factor.
Can a transformer rated at 60Hz operate on a 50Hz service?
A transformer designed for 60Hz cannot operate on a 50Hz service as more losses will occur and lead to higher temperature rise and shorter life span. On the contrary, a transformer rated 50Hz can operate on a 60Hz service.
What does the term Hertz (Hz) mean?
It is a term for AC frequency in cycles per second.
What is the "Efficiency" of a transformer?
The percentage of power transferred from the input of equipment to the output of equipment in Watts. (power out/power in x 100)
What is Core Loss?
Losses in watts caused by magnetization of the core and its resistance to magnetic flux when excited or energized at rated voltage and frequency, Also referred to as excitation loss or no-load loss
What Makes Kryfs 24x7 Transformers more efficient?
To lower the NLL we use prime Core material, thinner laminates to lower eddy currents, and use copper for higher conductivity.
Can Transformers develop Three Phase power from a Single Phase source?
No. Phase converters or phase shifting devices such as reactors and capacitors are required to convert single phase power to three phase.
Can a Single Phase Transformer be used on a Three Phase source?
Yes. Any single phase transformer can be used on a three phase source by connecting the primary leads to any two wires of a three phase system, regardless of whether the source is three phase 3-wire or Three phase 4-wire. The transformer output will be single phase
What is temperature rise in a transformer?
Can Single Phase Transformers be used for Three Phase applications?
Yes. Three phase transformers are sometimes not readily available whereas single phase transformers can generally be found in stock. Three single phase transformers can be used in delta connected primary and wye or delta connected secondary. They should never be connected wye primary to wye secondary, since this will result in unstable secondary voltage. The equivalent three phase capacity when properly connected of three single phase transformers is three times the nameplate rating of each single phase transformer. For example: Three 10 kVA single phase transformers will accommodate a 30 kVA three phase load