Fluke 1735 User Manual - Page 65
Measurement Theory, Waveform, Power Measurements
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Power Logger Measurement Theory Measurement Theory The following formulas are the basics of the measuring values: Voltage and current measurement ∫ VRMS = 1 T v 2 dt ∫ IRMS = 1 T 2 i dt I N = I1 + I2 + I3 RMS value of voltages RMS value of currents RMS value of neutral-conductor current Neutral is calculated when not measured, i.e., no 4phase Flexi set is connected. Waveform The angle given in the waveform function is based on the following formula. ⎡ ϕ = arctan⎢ P1 ⎤ ⎥ ⎢⎣ P12 + Q12 ⎥⎦ Angle between Q1 reactive power of first harmonic P1 active power of first harmonic Power Measurements 50 ∑ P = Vk × Ik × cos(ϕk ) active power (200 ms average values) k =1 Vk, Ik, ϕk values of harmonics ∑ PM =1 M M→ Pi i =1 active power over average interval 55
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