- + O: U 11 AsiacellTew pico-ampeiesall of themWhat is the value of Vin, if (Iz = 5 mA* ? )R1.2 k2Vin7.9 VRL2 k215.5 V O12.4 V O22.2 V O30 V O18.64 V OA 120 Vp is applied to the primary coilof a center-tap transformer of turnratio (n1: n2 = 6: 2) . If the secondary

WE will use KCL and KVL to find input voltage.

Answered: What is the value of Vin, if (Iz = 5 mA…

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Electrical Engineering

What is the value of Vin, if (Iz = 5 mA * ? ) R 1.2 k2 RL 2 k2 Vin 7.9 V 15.5 V O 12.4 V O 22.2 V O 30 V

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter3: Magnetic Starters

Section: Chapter Questions

Problem 30SQ

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(a) An ideal single-phase two-winding transformer with turns ratio at=N1/N2 is connected with a series impedance Z2 across winding 2. If one wants to replace Z2, with a series impedance Z1 across winding 1 and keep the terminal behavior of the two circuits to be identical, find Z1 in terms of Z2. (b) Would the above result be true if instead of a series impedance there is a shunt impedance? (c) Can one refer a ladder network on the secondary (2) side to the primary (1) side simply by multiplying every impedance byat2 ?
An infinite bus, which is a constant voltage source, is connected to the primary of the three-winding transformer of Problem 3.53. A 7.5-MVA,13.2-kV synchronous motor with a sub transient reactance of 0.2 per unit is connected to the transformer secondary. A5-MW,2.3-kV three-phase resistive load is connected to the tertiary Choosing a base of 66 kV and 15 MVA in the primary, draw the impedance diagram of the system showing per-unit impedances. Neglect transformer exciting current, phase shifts, and all resistances except the resistive load.
The transformer of Problem 3.16 is supplying a rated load of 50 kVA at a rated secondary voltage of 240 V and at 0.8 posr factor lagging. Neglect the transformer exciting current. (a) Determine the input terminal voltage of the transformer on the high-voltage side. (b) Sketch the corresponding phasor diagram. (c) If the transformer is used as a step-down transformer at the load end of a feeder whose impedance is 0.5+j2.0, find the voltage VS and the power factor at the sending end of the feeder.
A single-phase, 50-kVA,2400/240-V,60-Hz distribution transformer has the following parameters: Resistance of the 2400-V winding: R1=0.75 Resistance of the 240-V winding: R2=0.0075 Leakage reactance of the 2400-V winding: X1=1.0 Leakage reactance of the 240-V winding: X2=0.01 Exciting admittance on the 240-V side =0.003j0.02S (a) Draw the equivalent circuit referred to the high-voltage side of the transformer. (b) Draw the equivalent circuit referred to the low-voltage side of the transformer. Show the numerical values of impedances on the equivalent circuits.
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For an ideal 2-winding transformer, an impedance Z2 connected across winding 2 (secondary) is referred to winding 1 (primary) by multiplying Z2 by (a) The turns ratio (N1/N2) (b) The square of the turns ratio (N1/N2)2 (c) The cubed turns ratio (N1/N2)3
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For an ideal transformer, the efficiency is (a) 0 (b) 100 (c) 50
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Consider a single phase transformer with primary and secondary turns of 1000and 200 respectively fed by a 5 kV supply.The equivalent circuit of the transformer has the following component valuesderived from your student number:R1 = 10.5 ohmR2 = 2.5 ohmRm = 15.55 kohmX1= 12.5 ohmX2 = 2.5 ohmXm = 10.00 kohm The transformer is connected to an inductive load of 10.5 ohm a) Calculate the total loss in the transformer b) Calculate the efficiency of the transformer. Clearly show your reasoning