What is the principle of operation of resonant transformer?
Resonant transformer work on the principle that the load capacitance is variable and for certain loading when the capacitance is equal to inductance of the circuit resonance may occur. Under this condition then, the current will be very large and limited only by the resistance of the circuit.
What are the advantages of resonant transformers?
no high-power arcing and heavy current surges occur if the test object fails, as Resonant Transformers ceases at the failure of the test object, cascading is also possible for very high voltages, simple and compact test arrangement, and.
How is a resonant transformer advantageous over the Cascade connected transformers?
Advantages of Resonant transformer: (1) Application: Resonant transformer is able to produce high voltage and high current and for extremely high voltage requirement, the cascading of resonant transformer is also possible. (4) Design: Simple and compact test arrangement.
Is resonant a transformer?
A resonant transformer is a transformer in which one or both windings has a capacitor across it and functions as a tuned circuit. The transformer windings have either air or ferrite cores and the bandwidth can be adjusted by varying the coupling (mutual inductance).
How the harmonics are reduced?
Delta-wye transformers have a higher impedance to the flow of harmonic currents than to the fundamental current. This reduces the current harmonics, but higher impedance in the transformer causes a relatively higher voltage drop from the harmonic currents.
What are the disadvantages of resonant transformer?
The disadvantages of resonant transformers is
- A. Pure sine wave output.
- No high power arcing.
- No repeated flashovers.
- Additional variable chokes.
What are the disadvantages of using cascaded transformers?
The main disadvantage of cascading the transformers is that the lower stages of the primaries of the transformers are loaded more as compared with the upper stages. The loading of various windings is indicated by P in Figure.
What is EMF equation of a transformer?
Therefore, RMS value of emf per turn = Form factor X average emf per turn. Therefore, RMS value of emf per turn = 1.11 x 4f Φm = 4.44f Φm. This is called the emf equation of transformer, which shows, emf / number of turns is same for both primary and secondary winding.
What are the 2 types of transformers?
There are two types of potential transformers; the conventional wound type (or electromagnetic type) and the capacitor voltage (potential) transformer. For voltages exceeding 100 kV (phase) the conventional type of potential transformer becomes extremely expensive owing to the insulation requirements.
How can we reduce harmonics in transformer?
Five Ways to Reduce Harmonics in Circuits and Power Distribution Systems
- K-Rated Transformers. ANSI Standard C57.
- Measuring K-Factor. In any system containing harmonics, the K-factor can be measured with a power quality analyzer (see Figure 1).
- Circuit Load.
- Harmonic Mitigating Transformers.
- Delta-Wye Wiring.
- Zigzag Windings.