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Phasor graphical representation method of electrical load impedance

A technology of electric load and phasor, which is applied in the direction of measuring resistance/reactance/impedance, the phase angle between voltage and current, measuring electric variables, etc.

Inactive Publication Date: 2008-08-20
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a phasor diagram method of electric load impedance, which uses logarithmic graduation circle to solve the problem of electric load measurement

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  • Phasor graphical representation method of electrical load impedance

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Embodiment Construction

[0011] Such as figure 1 As shown, the present invention includes the use of logarithmic scale coordinates to display the impedance mode, realizes the nonlinear compression of the impedance mode, and is convenient to reflect the variation of the impedance mode in a large range, and uses the phasor diagram to include both the impedance mode and the impedance mode. In addition to the impedance angle, the three-phase symmetry is also taken into account. The method is to linearly divide the impedance angle from 0 to 360° (the circle represents 0 to 360°), and to express the logarithmic scale of the impedance modulus (logarithmic graduation circle) in polar coordinates, so in the logarithmic graduation circle 4 The polar axis 1 of phase A impedance, the polar axis 2 of phase B impedance, and the polar axis 3 of phase C impedance are drawn on the above. Through the method of drawing points, the three-phase impedance leads or lags behind the relevant polar axis by a certain angle and ...

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Abstract

The invention provides a phasor graphical representation method of power load impedance, which includes the following steps: dividing angle of impedance 0-360 degree into linear indexing, representing the impedance module logarithm indexing with polar coordinates, drawing A phase impedance polar axis, B phase impedance polar axis, C phase impedance polar axis on the logarithm reference circle graph, with dot drawing method, drawing dots on the places that are ahead or behind a certain angle of the relative polar axis and at a certain logarithm distance far from inner reference circle. The invention has the advantages that:(1) indirect measuring impedance of electrical load is realized by sampling three-phase voltage and three-phase current waveform in real time and calculating three-phase impedance; (2) displaying the measure result on logarithm reference circle graph in phasor type; (3) displaying impedance module with logarithm indexing coordinate in real time; (4) using phasor graph.

Description

technical field [0001] The invention relates to a method for real-time measurement of electric load impedance, in particular to a method for phasor diagramming of electric load impedance Background technique [0002] The measurement of electrical load impedance parameters plays a very important role in the fault diagnosis, load monitoring, and relay protection of power systems. At present, there is no in-depth research on the technology of real-time measurement of electrical load impedance at home and abroad, so it is necessary to invent New measurement methods are widely used in power systems. By summing the three-phase voltage waveform and the three-phase current waveform, the three-phase voltage phasor and the three-phase current phasor can be obtained, and the three-phase impedance can be calculated by using the impedance definition. The key is how to effectively display the three-phase impedance, It is required to be intuitive and convenient, and the range of the imped...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/08G01R25/00
Inventor 赵文龙任明珠
Owner NANCHANG HANGKONG UNIVERSITY