Phase Angle Measurement from Peak Areas (PAMPAS)

2000 ◽  
Vol 146 (1) ◽  
pp. 20-32 ◽  
Author(s):  
Željko Džakula
Keyword(s):  
Phase Angle ◽  
Angle Measurement ◽  
Peak Areas

The Influence of Time Truncation on Phase Angle Measurement Principle

2014 ◽  
Vol 668-669 ◽  
pp. 957-960
Author(s):  
Na Na Chang ◽  
Hai Bao
Keyword(s):  
Fourier Transform ◽  
Steady State ◽  
Theoretical Calculation ◽  
Phase Angle ◽  
Measurement Data ◽  
Angle Measurement ◽  
Signal Phase ◽  
Measurement Principle ◽  
Dc Component ◽  
State Component

Real-time accurate voltage phase angle measurement data has a very important significance to monitor and analyze the power system, and phase angle measurement principle of Fourier transform plays an important role in the theoretical calculations and engineering applications. The dynamic sinusoidal voltage signal contains two parts of the sinusoidal steady-state component and decaying DC component, and the decaying DC component having a continuous spectrum, at the frequency corresponding to the sinusoidal steady-state component must have a non-zero value, making dynamic signal phase than steady signal phase has one extra deviation angle. Considering Fourier transform method and theory of engineering application are different, this paper only considered the application conditions of time truncation, analyzes continuous Fourier transform under a real eigenvalue and a pair of conjugate complex roots condition, then compared with the theoretical calculation, for the two case of limited time integration and theoretical calculation condition, the phase angle difference and influencing factors are given.

Role of phase angle measurement in electrical impedance spectroscopy

2013 ◽  
Vol 27 (4) ◽  
pp. 377-383 ◽  
Author(s):  
I. Cseresnyés ◽  
K. Rajkai ◽  
E. Vozáry
Keyword(s):  
Energy Dissipation ◽  
Impedance Spectroscopy ◽  
Phase Angle ◽  
Characteristic Frequency ◽  
Electrical Impedance ◽  
Angle Measurement ◽  
Electrical Impedance Spectroscopy ◽  
Impedance Method ◽  
Soil System ◽  
Current Frequency

Abstract Importance of phase angle measurement during the application of electrical impedance spectroscopy was studied by executing pot experiments with maize. Electrical impedance, phase angle (strength of capacitive character), and dissipation factor in the plant-soil system were scanned between 100 and 10 000 Hz current frequency. The frequency-dependent change in the phase angle could be described by optimum curves culminating within 920-3 650 Hz. Since the rate of energy dissipation is independent of root extent, the higher phase angle and lower energy dissipation were associated with the higher coefficient of determination achieved for the root electrical impedance - root system size (root dry mass and root surface area) regressions. The characteristic frequency selected on the basis of phase angle spectra provided a higher significance level at statistical comparison of plant groups subjected to stress conditions influencing root development. Due to the physicochemical changes observable in aging root tissue, the apex of phase angle spectra, thus the characteristic frequency, shifted continuously toward the higher frequencies over time. Consequently, the regularly repeated phase angle measurement is advisable in time-course studies for effective application of the electrical impedance method, and the systematic operation at the same frequency without determination of phase angle spectra should be avoided.

An Principle and Technology of On-Machine Measurement for Large Gear Hopping

2010 ◽  
Vol 118-120 ◽  
pp. 836-840
Author(s):  
Jia Qi Jin ◽  
Xing Yu Jiang ◽  
Feng Hui Li ◽  
Hui Li
Keyword(s):  
Phase Angle ◽  
Angle Measurement ◽  
Large Structure ◽  
Structure Quality ◽  
Pressure Angle ◽  
Profile Deviation ◽  
Large Gear ◽  
Definition Of ◽  
Edge Probe ◽  
Gear Profile

For large gear with the characteristic of large structure, quality and modulus, its profile precision is usually measured by in-site measurement. Based on large gear on-machine measuring described, involute helicoid and its characteristic are studied. The definition of medium rack in the framework of gear meshing transmission is put forward, the scheme of on-machine measurement based on rack-shaped-edge probe is formed, which can be divided into rolled angle (phase angle) and pressure angle (meshing angle) measurement according to the rotation of gear and prob. Measurement grid is determined by measuring straight generatrix deviation of gear profile, furthermore total tooth profile deviation and total helix deviation are separated.

Error Analysis of Wide Area Measurement Based Measurement Power Flow

2013 ◽  
Vol 816-817 ◽  
pp. 446-449
Author(s):  
Hai Bao ◽  
Jin Si Han ◽  
Gang Liu ◽  
Ling Wang
Keyword(s):  
Phase Angle ◽  
Power Flow ◽  
Engineering Calculation ◽  
Angle Measurement ◽  
Area Measurement ◽  
Wide Area ◽  
Initial Value ◽  
Power Flow Calculation ◽  
Flow Calculation ◽  
Dc Power

Measurement take place of calculation is an advantage of wide area measurement based measurement power flow, but its accuracy needs to be explored. This paper points out the measurement power flow’s data dose not conform to the actual power flow’s data on condition of phase angle measurement exist error. Through the analysis of example we can see that the deviation of active power will reach 15% when phase angle exist 0.1°error, its accuracy is worse than DC power flow in engineering calculation .This paper suggest using the phase angle value which was measured as initial value in power flow calculation, it will reduce the error’s impact on power flow calculation.

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