Transformers

Audio Frequency Transformer

Audio Frequency Transformer

Audio Frequency Transformer: Audio Frequency Transformer is used at the output stage of Audio Frequency electronic amplifier for matching the load to the output impedance of the power amplifier stage. Here the load is fixed but the frequency is variable over a band (audio, 20 Hz to 20 kHz), the response being the ratio V2/V1. […]

Audio Frequency Transformer Read More »

Tap Changing Transformer

Tap Changing Transformers

Tap Changing Transformer | Off Load Tap Changer |On Load Tap Changing: Tap Changing Transformer -Voltage variation in power systems is a normal phenomenon owing to the rapid growth of industries and distribution network. System voltage control is therefore essential for: Adjustment of consumers’ terminal voltage within prescribed limits. Control of real and reactive power

Tap Changing Transformer Read More »

Phase Conversion in Transformer

Phase Conversion

Phase Conversion in Transformer: Three Phase to Two Phase Conversion Transformer (Scott-T transformer or Scott Connection): Phase conversion from three to two phase is needed in special cases, such as in supplying 2-phase electric arc furnaces. The concept of 3/2-phase conversion follows from the voltage phasor diagram of balanced 3-phase supply shown in Fig. 3.61(b).

Phase Conversion in Transformer Read More »

Three Winding Transformer

Three Winding Transformers

Three Winding Transformer: Three Winding Transformer may be built with a third winding, called the tertiary, in addition to the primary and secondary. Various purposes which dictate the use of a tertiary winding are enumerated below: To supply the substation auxiliaries at a voltage different from those of the primary and secondary windings. Static capacitors

Three Winding Transformer Read More »

Parallel Operation of Transformer

Parallel Operation of Transformer

Parallel Operation of Transformer: When the load outgrows the capacity of an existing transformer, it may be economical to install another one in parallel with it rather than replacing it with a single larger unit. Also, sometimes in a new installation, two units in parallel, though more expensive, may be preferred over a single unit

Parallel Operation of Transformer Read More »

Back to Back Test of Transformer

Back-to-Back Test on Three-phase Transformers

Back to Back Test of Transformer: The Back to Back Test of Transformer which consists of two parts namely, Back to Back Test on Three Phase Transformer Back to Back Test on Delta/Delta Transformers 1. Back to Back Test on Three Phase Transformers: Fig. 3.52(a) shows the connection arrangement for the Back to Back Test

Back to Back Test of Transformer Read More »

Three phase Transformer Bank of Single phase Transformers

Three-phase Bank of Single-phase Transformers

Three phase Transformer Bank of Single phase Transformers: The different Three phase Transformer Bank of Single phase Transformers are namely, Delta/delta connection: The supply voltage provides only sinusoidal magnetizing current so that core flux is flat-topped; but the third-harmonic emfs induced (cophasal) cause circulating currents in deltas restoring the flux to almost sinusoidal. The third-harmonic

Three phase Transformer Bank of Single phase Transformers Read More »

Choice of Transformer Connection Diagram

Choice of Transformer Connection Diagram: The different choice of Transformer Connection Diagram are namely, Star/star: This is economical for small HV transformers as it minimizes the turns/phase and winding insulation. A neutral connection is possible. However, the Y/Y connection is rarely used because of difficulties associated with the exciting current. Delta/delta: This Choice of Transformer

Choice of Transformer Connection Diagram Read More »

Three Phase Transformer Connections

Three Phase Transformers

Three Phase Transformer Connections: In generation, transformation, transmission and utilization of electric energy it can be shown that it is economical to use the three-phase system rather than the single-phase. For Three Phase Transformer Connections, three single-phase transformers are needed. Two arrangements are possible: a bank of three single-phase transformers or a single three-phase transformer

Three Phase Transformer Connections Read More »

Scroll to Top