3 Steps for Solving any Two Wattmeter Method Problem Part 2 (Electrical Power PE Exam)

How to solve every two method wattmeter problem on the Electrical Power PE Exam in three quick steps!

In Part 2 of this series, we are going to show you:

1. How to draw the phasor diagram for both wattmeter 1 (W1) and wattmeter 2 (W2) depending on how each wattmeter is connected according to the three "RULES" from Part 1.

The phasor diagrams will depend on which phases the positive (+) and negative (-) voltage polarity are connected to for wattmeter 1 (W1) and wattmeter 2 (W2).

2. How to easily derive the correct power angle (θ) for both wattmeter 1 (W1) and wattmeter 2 (W2) graphically using both of the phasor diagrams we set up.

*Here's the trick! One of the line voltages being measured by either wattmeter 1 (W1) or wattmeter 2 (W2) depending on how they are connected will be NEGATIVE (CBA) SEQUENCE, and one will be positive (ABC) sequence.

*Inside the cosine function in the power formula, one of the wattmeters will have θ MINUS thirty degrees while the other will have θ PLUS thirty degrees depending on how both wattmeters are connected:

cos(θ-30º)
cos(θ+30º)


Click here to watch the next video (Part 3) in this series:
   • 3 Steps for Solving any Two Wattmeter...  

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