Measuring Power Factor (Cos φ) and Load Reactance in 220V 50Hz AC Circuits

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#1 21682115 05 Mar 2019 23:59

Erdem X Erdem X

Anonymous

Post #1
21682115 05 Mar 2019 23:59

hi guys, ı am stundent ,and ı has a project about ac current finding phase diffrence.actually, ı want to find load's reactive value on the system. which circuit should ı use for calculating cos angle???My country has 220 volt -50hz energy system .thank you so much
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#2 21682116 06 Mar 2019 14:05

David Ashton David Ashton

Anonymous

Post #2
21682116 06 Mar 2019 14:05

Erdem, questions like this usually involve being given some information and calculating something else from it.For example you might be given the voltage, current and phase angle and have to calculate the load impedance.In your case it seems you have to find the angle AND the load impedance. If you get the voltage, the current and the actual power in Watts you could calculate both of these (from the difference between W and KVA you can calculate the angle and then the impedance).Let us know what information you DO have and what you have done so far and we may be able to help you. And if you are actually working with 230V be very careful.
#3 21682117 06 Mar 2019 14:26

Erdem X Erdem X

Anonymous

Post #3
21682117 06 Mar 2019 14:26

I am sorry. I need a circuit for calculating load.I desing a basic compensation relay to my homework,so ı ask you
#4 21682118 09 Mar 2019 13:54

David Ashton David Ashton

Anonymous

Post #4
21682118 09 Mar 2019 13:54

OK, I'm still not sure exactly what you're trying to do but I assume it is to calculate and apply power factor compensation to non-resistive loads?In that case you need to look at your voltage and the current in your load. In a reactive load they will be out of phase, and by looking at the timings (maybe of the sero crossing points on the waveform) you will be able to calculate the phase angle.Once you know that and the current, you would be able to calculate the compensation that would be required. In the case of inductive loads, eg fluorescent lamps or motors, you could then switch in capacitors to bring the phase angle back to a decent value.
#5 21682119 09 Apr 2019 12:43

Beverly Scott Beverly Scott

Anonymous

Post #5
21682119 09 Apr 2019 12:43

Locate the circuit for which you want to calculate the circuit load. Take the breaker size and multiply it by the rated voltage. For example, a 20 amp breaker that operates at 120 volts has a maximum load of 2400 watts.
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#6 21682120 09 Apr 2019 23:19

Erdem X Erdem X

Anonymous

Post #6
21682120 09 Apr 2019 23:19

Thanks ı knew it. I will try it with voltage and current transformer
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#7 21682121 10 Apr 2019 10:34

Beverly Scott Beverly Scott

Anonymous

Post #7
21682121 10 Apr 2019 10:34

Locate the circuit for which you want to calculate the circuit load. Take the breaker size and multiply it by the rated voltage. For example, a 20 amp breaker that operates at 120 volts has a maximum load of 2400 watts.
Any update ???
#8 21682122 17 Aug 2019 21:06

zainab khan zainab khan

Anonymous

Post #8
21682122 17 Aug 2019 21:06

In that case you need to look at your voltage and the current in your load. In a reactive load they will be out of phase, and by looking at the timings (maybe of the sero crossing points on the waveform) you will be able to calculate the phase angle.tellthebell
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Anonymous

Post #9
21682123 17 Aug 2019 21:07

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#11 21682125 31 Mar 2020 11:38

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Post #11
21682125 31 Mar 2020 11:38

by any chance can you share the circuit because it is essential for calculating the load Kroger Feedback
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Topic summary

The discussion focuses on measuring power factor (cos φ) and load reactance in 220V, 50Hz AC circuits, particularly for a student project involving phase difference and reactive load calculation. Key advice includes measuring voltage, current, and real power (Watts) to determine the phase angle and load impedance. Phase angle can be derived from the difference between active power (W) and apparent power (kVA). Observing zero-crossing points of voltage and current waveforms helps calculate the phase shift in reactive loads. For power factor compensation, capacitors can be switched in to correct inductive loads such as motors or fluorescent lamps. Practical suggestions include using voltage and current transformers for measurement and considering breaker ratings to estimate maximum load power. The discussion emphasizes careful measurement and calculation methods to accurately determine load reactance and power factor in typical residential or industrial AC systems operating at 220V and 50Hz.
Summary generated by the language model.