loader image

Frequently Asked Questions

What is a transformer and how does it work?

A transformer is an electrical static equipment 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 device, which insures under normal 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 level (or potential difference ratio) between the primary and secondary depends on the turns ratio of the two coils.

What type of conductor is used in the Transformer manufactured by GTU?

Copper or Aluminium

What Type of Transformer does GTU offer?

  • Construction Wise
    • Single Phase Transformers
      • 5 KVA
      • 10 KVA
      • 16 KVA
    • Three Phase Transformers
      • 10 KVA
      • 16 KVA
      • 25 KVA
      • 40 KVA
      • 63 KVA
      • 100 KVA
      • 160 KVA
      • 250 KVA
      • 315 KVA
      • 400 KVA
      • 500 KVA
      • 630 KVA
      • 800 KVA
      • 1000 KVA
    • Onan & Dry Type Distribution Transformers

What type of Winding does GTU Offers in Terms of Winding?

  • Helical winding
    • Round Wires
      • F Class Insulation
      • H Class Insulation
    • Rectangular Strips
      • Paper Covered
      • Fiber Glass Covered
      • Enamelled Fiber Glass Covered
  • Foil Winding
  • Toroidal winding

What type of Core Construction does GTU Offers for Transformers?

  • Single Phase EI Construction
  • Three Phase EI Construction
  • Single Phase Strip Construction
    • Single Coil Core Construction
    • Double Coil Core Construction
    • Four Coil Core Construction
    • Six Coil Core Construction
  • Three Phase Strip Construction
  • Toroidal Construction

Why do a Transformer hum?

Electric hum around transformers is caused by stray magnetic fields causing the enclosure and accessories to vibrate. Magnetostriction is a second source of vibration, in which the core iron changes shape minutely when exposed to magnetic fields. Around high-voltage power lines, hum may be produced by corona discharge.

What is the use of the Taps on a Transformer?

Transformers are normally provided with taps to adjust the turns ratio to compensate for this supply variance. This will allow the output voltage to be closer to the rated output voltage when the input voltage is off rated voltage. What is a Tap? Each turn on both the high and low voltage coils has the same voltage.

Can transformers be operated at voltages other than rated voltages?

In some cases, transformers can be operated at voltages below the nameplate rated voltage. In NO case should a transformer be operated at a voltage in excess of its nameplate rating, unless taps are provided for this purpose. When operating below the rated voltage, the kVA capacity is reduced correspondingly.

Can 60 Hz transformers be operated at 50 Hz?

  • When we try to operate the transformer at lower frequency the following will happen
    • When frequency (f) increases, Inductive reactance (XL) increases.
    • When Inductive reactance (XL) increases, Impedance (Z) increases.
    • When Impedance Increase, Current decreases.
  • So we can say that:
    • When we operate a 60Hz transformer on 60Hz supply source, the current will be as designed.
    • But when operated a 60Hz transformer on 50Hz supply source, the current were more than what was designed.
    • The extra current in this case may causes copper loss (P = I2R) and produces heat.

Can transformers be used in parallel?

  • Three conditions must be met before you can connect transformers in parallel.
    • The transformers must have the same primary and secondary voltage ratings.
    • When making the connections, you must observe the terminal polarity of the transformers
    • All the transformers must have the same percent impedance.

If You Have Any Questions You Can Call Us 24/7

Reach Us

Get Free Quote

Feel free to ask anything We are here to help you.