CHAPTER 3 31 Four boxes represent an AC generator reactor re

CHAPTER 3 3.1 Four boxes represent an AC generator, reactor, resistor, and capacitor and are connected to a source bus XY as shown in Figure P3.1. From the circuit and phasor diagrams, identify each box. 3.2 Two transformer banks are connected to a common bus as shown in Figure P3.2. What are the phase relations between the voltages VAN and V VBN and V VCN and V A\'NY B\'N\' CN 3.3 Reconnect transformer bank 2 of Problem 3.2 with the left windings in wye instead of delta, and the right windings in delta instead of wye so that V and V AN are in phase, Vi and Vi ase, and V BN are in ph and V are in phase. 3.4 The power transformer connections shown in Figure P3.3 are non- standard and quite unusual with today\'s standardization. However, this connection provides an excellent exercise in understanding phasors, polarity, and directional sensing relay connections. FIGURE P3.1

Solution

Ans) 3.1)

I₁ is 180^o out of phase with Vxy ,hence it is as Generator as Power here is supplied not consumed

1.Generator

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I₂ is 90^o leading the volatge Vxy,Hence it is a capacitor

2.Capacitor

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I3 is in phase with Vxy Hence it is Resistor

3.Resistor

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I₄ is 90^o lagging the volatge Vxy,Hence it is a reactor

4.Reactor

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