Question 1. parameters: A single-phase, 10 kVA, 4400/1100 V, 50 Hz transformer has the following High voltage (HV) side winding parameters: RƒV = R₁ = 5N, Low voltage (LV) side winding parameters: RLV = R2 = 0.35 2, Core loss resistance and magnetizing inductance: Rc(HV) = LHV = L₁₁ = 0.09 H LLV = L12 = 0.0032 H 150 kN, Lm(HV) = 180 H (a) Obtain an equivalent circuit of the transformer referred to the HV side. (b) Determine the voltage regulation at full load with 0.8 power factor (PF) leading. (c) Determine the no-load power loss (core loss) based on the circuit model in (a).

The direct electrical connection of the windings allows transient over voltages to pass through the auto transfonner more easily, and that is an important disadvantage of the autotransformer. (a) True (b) False

The symbol shown is a(n) a. iron core transformer. b. auto transformer. c. current transformer. d. air core transformer.

A single-phase step-down transformer is rated 13MVA,66kV/11.5kV. With the 11.5 kV winding short-circuited, rated current flows when the voltage applied to the primary is 5.5 kV. The power input is read as 100 kW. Determine Req1andXeq1 in ohms referred to the high-voltage winding.

Consider an ideal transformer with N1=3000andN2=1000 turns. Let winding 1 be connected to a source whose voltage is e1(t)=100(1| t |)volts for 1t1ande1(t)=0 for | t |1 second. A2- farad capacitor is connected across winding 2. Sketch e1(t),e2(t),i1(t),andi2(t) versus time t.

The ratings of a three-phase three-winding transformer are Primary(1): Y connected 66kV,15MVA Secondary (2): Y connected, 13.2kV,10MVA Tertiary (3): A connected, 2.3kV,5MVA Neglecting winding resistances and exciting current, the per-unit leakage reactances are X12=0.08 on a 15-MVA,66-kV base X13=0.10 on a 15-MVA,66-kV base X23=0.09 on a 10-MVA,13.2-kV base (a) Determine the per-unit reactances X1,X2,X3 of the equivalent circuit on a 15-MVA,66-kV base at the primary terminals. (b) Purely resistive loads of 7.5 MW at 13.2 kV and 5 MW at 2.3kV are connected to the secondary and tertiary sides of the transformer, respectively. Draw the per- unit impedance diagram, showing the per-unit impedances on a 15-MVA,66-kV base at the primary terminals.

Given a center tapped transformer, plot the output wave form. (Assuming practical model)

What is the relationship between primary induced emf( E1) and applied voltage (V1) of a Transformer? O a. Both are unequal and in phase O b. Both are unequal and 180 degree out of phase O c. Both are equal and 180 degree out of phase O d. Both are equal and inphase

In part c determine the voltage across Rp and Xp  .

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