Lab 3

Department of Electrical Engineering

POWER SYSTEM ANALYSIS LAB # 3 Real and Reactive Power

Group Members: Muhammad Sohaib (150336) Ahsan Rathore

(150369)

Hafiz Usman

(150426)

Ali Arif

(150167)

Sheikh Mohsin

(150235)

Usama faraz

(150239)

Department of Electrical Engineering

Objectives:  

To interpret the meaning of positive, negative, real and reactive power. To observe the flow of real and reactive power in three-phase circuits.

Conceptual Ideal:    

E2 = E1 => in phase (P=0) , (Q=Qo) E2 != E1 => in phase (P=0) , (Q=Qo) E2 = E1 => out of phase (P=P’) , (Q=0) E2 != E1 => out of phase (P=P’) , (Q=Q’)

Above relation show flow of power flows

Procedure:    

 

 

Using a load of three 300ohms resistances connected in wye shown in figure Replace the resistive load by three inductances having a reactance of 300 ohms, connected in wye. Repeat experiment 3-2, using three capacitances having a reactance of 300 ohms, connected in wye. Record your results in table. Repeat experiment 3-3, but add three resistances of 300 ohms (wye connected) in parallel with the capacitive load. Record your results in table. Is the real power affected when the capacitive load is switched in and out. Repeat the experiment 3-1, but place the inductive load of experiment 3-2 in parallel with the resistive load and record your table. Repeat experiment 3-1 but use an inductive load of 300 ohms in parallel with the capacitive load of 300 ohms, all connected in wye, records the value and place in table. Repeat experiment 3-1, but use a three-phase induction motor at no load in place of the resistive load. Record your results in table Knowing that the apparent power of a balanced three-phase circuit is given by the equation VA=E1*Square root 3

Circuit Diagram/Hardware:

Department of Electrical Engineering

Calculations and Results:

Department of Electrical Engineering

Department of Electrical Engineering

Conclusion: In this lab we learn about real and reactive powers flow in circuits by placing different load like inductive capacitive and inductive loads.