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Aim: To Calibrate LPF wattmeter by Phantom Loading. Apparatus: 1) Voltmeter - 300V Digital --> 1 2) Ammeter - 10A Digital --> 1 3) Phase shifting Transformer - 415V/15A --> 1 4) Auto Transformer - 240V/0-270V,10A --> 1 5) Power Factor meter - 230V,10A-Dynamometer --> 1 6) Wattmeter(LPF) - 230V,10A-Dynamometer --> 1 7) Connecting wires Procedure: 1) Keep connections as per circuit diagram. 2) Keep Auto Transformer in minimum position and On toggle Switch. 3) Vary the transformer at Power coil till voltmeter reads rated value. 4) Vary phase shifting transformer to set power factore at 0.2 lag. 5) Now slowly vary the auto transformer at Current coil in Steps. 6) Note the values of wattmeter at each step of current. 7) Repeat the above step till Ammeter reads rated current. 8) Calculate percentage of error. Plot the graph between current and percentage of error, keep current on X-axis and % error at Y-axis. Calculations: Wa = VxIxCosQ watts. Wm = watts. % error = [(Wa-Wm)*100]/Wm. Precautions: 1) Avoid loose connections. 2) Avoid parallax errors.
• 3) Keep wattmeter and P.F meter in parallel.
Result:
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# Is a wattmeter required to measure the active power delivered to a resistive load?

No. If the load is truly resistive, just measure the voltage across the load (in volts)and the current flowing in it (in amps) and multiply them. eg: 115 volts at 1.5 amps = 1 (MORE)

# Is there any difference in values between the two wattmeter method and three wattmeter method if you apply these two methods in same load?

Blondel's Theorem states that you can have one less wattmeter than there are conductors supplying a balanced or unbalanced load. In either case, the sum of the wattmeter readi (MORE)

# What is LPF?

LPF is Low power factor, which is used to calculate overall power in VA (voltamps) kind of like calculating overall power in watts.
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