**Transformer Circuit Diagram**

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Figure A1.1 Circuit diagram Figure A1.2 Phasor diagram of loaded transformers. Assumed turns ratio 1:1 N2 cos φ2 1 2 R 2 secondary resistance voltage drop 1 2 X 2 secondary reactance voltage drop 1 2 Z 2 secondary load resistance Rl Q.l Draw the circuit diagram of polarity test on transformer. Ans. : Refer section 7.3. Q.2 Draw the circuit diagram of open circuit test on transformer. Ans. : Refer section 7.4.1. Q.3 Draw the circuit diagram of short circuit test on transformer.Basic Concepts : Concept of coupled circuits, Dot convention, Writing network equilibrium equations in coupled circuits (problems on coupled circuits excluded), Principle of transformer action for voltage transformation, Constructional Distinguish between the 'efficiency'.and the 'regulation' of a transformer. Show how power factor affects both of them. Explain with circuit diagrams, the opencircuit and shortcircuit tests to be carried out in the laboratory for the determination of Magnetic coupling is the basis of operation for devices called transformers, which use magnetically coupled coils to allow 9.35 Circuitdiagram symbols for transformers Each term of the form Mdi=dtðÞ in (9.67) is a voltage induced in one coil Object: Determination of circuit parameters and losses in a singlephase transformer by open circuit and short circuit test and obtain the following : (a) Voltage regulation in percentage. (b) Equivalent circuit diagram ( using circuit parameters).In commercial.power transformers, the leakage flux is very small and is often neglected. The alternating flux A twowinding power transformer can be represented by an equivalent circuit diagram as shown in Figure 5.4. The exciting current Draw the circuit diagram. 2. Draw the phasor diagram. 3. 2.27 Voltage and Current Relationships for Different Types of Connections I. State the voltage and current relationships for various connections of three phase transformers. 2.28 Pulse Why are some transformers constructed with primary and secondary windings divided into two halves ? Distinguish between power and distribution transformers. Draw and explain the noload phasor diagram for a singlephase transformer.Draw the suitable circuit diagram..2. Explain the short circuit test and open circuit test on transformer. Why these tests are to be performed ? 3. Explain with neat circuit diagram, how Sumpner's test is performed ? What are its advantages over