[PDF] EE320 LAB EXERCISE  “Power Factor Correction” Name: Partner(s):

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EE320 LAB EXERCISE  “Power Factor Correction” Name: Partner(s):

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EE320 LAB EXERCISE #3

"Power Factor Correction" Name: _______________ ______ Partner(s): _________________ _____ Problem: In this exercise, we will further investigate performing power factor correction on a single-phase induction motor load. Emphasis is on making correct calculations and taking measurements to confirm the theory. Step 1: Build the circuit shown in EITHER Figure 1a (if you have the AEMC 3945-B power analyzer) or Figure 1c (if you have the PM300 power analyzer) using the EMS8821 power supply, the EMS8251 capacitor-start motor module, the power analyzer, and connection cabling. THE POWER SUPPLY SHOULD REMAIN OFF. Figure 1a: Main Circuit Connections (with AEMC 3945-B power analyzer) Recall that the menu settings for the AEMC power analyzer are controlled as follows Figure 1b: Front Panel Control Buttons for AEMC 3945-B 2 Figure 1c: Main Circuit Connections (with PM300 power analyzer) Step 2: Confirm that the dynamometer is coupled to the motor with a timing belt and that the dynamometer is connected to the 24V AC power supply. Ensure that the dynamometer is set as follows:

Dynamometer mode (versus prime mover)

Manual

Manual knob full CCW (zero torque)

Toggle switch set to display torque

HAVE THE INSTRUCTOR VERIFY YOUR SETUP: ____________________

Step 3: Energize the 24V

AC power supply and the main power supply switch. The motor should be running. Toggle the switch on the dynamometer so you can read the motor speed and the applied load torque (confirm that it is zero). rpm

N______________

Nm

T______________

Record the voltage, current, and power displayed by the power analyzer.

V______________ I______________ P______________

TURN OFF THE AC POWER SUPPLY

3 Step 4: Calculate the apparent power, reactive power, and power factor (show the equation you used in the first blank) S________________________________ = ______________ Q________________________________ = ______________ pf________________________________ = ______________ Step 5: Our initial goal is to power factor correct the system to unity. For 1pf, what is the required new power factor angle ,pf des

What is the required plant reactive power

Plant

Q (where the plant consists of both

the induction motor load and the capacitor bank)? Knowing the reactive power of the induction motor, determine the required reactive power of the capacitor bank C Q What is the electrical angular frequency of the system?

What is the required capacitance?

Compute the anticipated magnitude of power supply current (use S) 4 Step 6: Using the two EMS8331 variable capacitance modules at your workstation (shown in Figure 2) and only parallel connections, implement the value closest to the required capacitance found in the previous step. Recall, a switch UP means the capacitor is in the circuit. Indicate the capacitor value you are implementing: ____________

Figure 2: Variable Capacitance Module

HAVE THE INSTRUCTOR VERIFY YOUR VALUE: ____________________

Step 7: Run the experiment

Connect the top of the capacitor bank to terminal 2 of the induction motor. Connect the bottom of the capacitor bank to terminal 1 of the induction motor.

Energize the 24V

AC supply and the main power supply. The motor should be spinning. Collect the following data (ensure you scale the values for the AEMC analyzer)

V______________ I______________ P______________

De-energize the power supply

Compute the following

S________________________________ = ______________ Q________________________________ = ______________ pf________________________________ = ______________

Are Q and I close to their anticipated values?

5 Step 8: We next wish to modify the capacitance to achieve 0.7pf lagging.

What is the required new power factor angle

,pf des

What is the required plant reactive power

Plant

Q (where the plant consists of both

the induction motor load and the capacitor bank)? Knowing the reactive power of the induction motor, determine the required reactive power of the capacitor bank C Q

What is the required capacitance?

Compute the anticipated magnitude of power supply current Step 9: Modify the settings of the two EMS8331 variable capacitance modules at your workstation to implement the value closest to the required capacitance found in the previous step. Indicate the capacitor value you are implementing: ____________ HAVE THE INSTRUCTOR VERIFY YOUR VALUE: ____________________ 6

Step 10: Run the experiment

Energize the 24V

AC supply and the main power supply. The motor should be spinning.

Collect the following data

V______________ I______________ P______________

De-energize the power supply

Compute the following

S________________________________ = ______________ Q________________________________ = ______________ pf________________________________ = ______________

Are Q and I close to their anticipated values?

Follow-Up Calculations:

1. If you wish to achieve a power supply current of 3A

RMS , what would be the required capacitor value? 7 2. What would be the capacitance required to achieve a 0.85 LEADING power factor and what would be the resultant current magnitude?quotesdbs_dbs6.pdfusesText_12