PRELAB. To be submitted to your instructor at the beginning of the lab session

 

  ELET 4143

Electrical Machines and Controls

Spring 2008

Electrical Engineering Technology SUNY College of Technology, Alfred, NY ELET 4143 Electrical Machines and Controls Spring Semester 2008

Lab 4. 4. Singl e Phase Power

PRELAB. To be submitted submitted to your instructor at the beginning of the lab session session

1.  Calculate the values for I1, I2, IT, ER1, ER2, EL, EC, P1, P2, and PT. Use R 1 = 25Ω  and Ω

R 2 = 25   2.  Explain the meaning of power factor an how do you calculate it. 3.  Explain what is a Power Triangle in an electric circuit and how do you calculate it. LABORATORY EXPERIMENT 

1.  Connect the circuit above. Draw the schematic showing where the m meters eters for all measurements should go. 2.  Record the following data: I1, I2, IR , ER1, ER2, EL, EC, P1, P2, and PT. 3.  From the data obtained in step #2, determine the following: a.  b.  c.  d.  e.  f. 

The power factor in both branches and the overall power factor. Construct, to scale, a vector diagram of the three currents. Construct, to scale, a vector diagram for the voltages in branch one and  branch two. Construct, to scale, a power triangle for the overall circuit. Determine, by calculations, the actual value of the inductor in henrys and the capacitance in microfarads. Determine, by calculations, the resistance of the coil.