Method for obtaining false-wiring back-fill electric quantity of three-phase three-wire electric energy meter
A three-phase three-wire, wrong wiring technology, applied in the direction of measuring electrical variables, measuring devices, instruments, etc., can solve the problems of power calculation errors, no power, no average power factor, etc., to achieve the removal of power factor, accurate and reasonable error power Effect
Active Publication Date: 2015-02-25
STATE GRID CORP OF CHINA +2
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Problems solved by technology
These two methods are not rigorous and will bring a lot of error to the power calculation.
Moreover, wrong wiring generally occurs on newly installed energy metering devices. In the past, there was no electricity and no average power factor to learn from.
Method used
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[0022] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.
[0023] refer to figure 1 As shown, the two horizontal and vertical rays of the four-quadrant electronic watt-hour meter of the present invention divide the power display into four areas, the first quadrant is located in the upper right section, and the three quadrants II, III, and IV are sorted counterclockwise. For ease of understanding, the following settings are used: the ray from left to right is used as the direction of positive input current. The change of power factor is regarded as the change of voltage phase angle, and the current phase is unchanged. When the watt-hour meter is running in the forward load state, the voltage phasor changes in the first quadrant, and the current is in the lagging position at this time, which is regarded as the inductive reactive power input to the user, because it is different from the positive ac...
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The invention discloses a method for obtaining the false-wiring back-fill electric quantity of a three-phase three-wire electric energy meter. The method is characterized by comprising the following steps: firstly, listing an active power calculation expression and a reactive power calculation expression according to the wiring mode of the three-phase three-wire electric energy meter, secondly, conducting simplified calculation on the active power calculation expression and the reactive power calculation expression, thirdly, obtaining the read electric quantity of the three-phase three-wire electric energy meter and an electric quantity calculation formula, and fourthly, obtaining the false-wiring back-fill electric quantity of the three-phase three-wire electric energy meter. According to the method for obtaining the false-wiring back-fill electric quantity of the three-phase three-wire electric energy meter, the correct electric quantity can be rapidly and accurately calculated, the back-fill electric quantity numerical result is given out, the influences of power factors are removed, and the more accurate and reasonable error electric quantity can be obtained.
Description
technical field [0001] The invention relates to a method for calculating the electric energy of the incorrect wiring of an electric energy meter, and in particular to a method for obtaining the electric energy of the incorrect wiring of a three-phase three-wire electric energy meter. Background technique [0002] Now my country's electric power system generally promotes the use of four-quadrant multi-functional electric energy meters. The four-quadrant multi-functional electric energy meters have two-way (current) electric energy measurement functions. The four-quadrant electric energy meters display active power and reactive power. figure 1 shown. The existing method for obtaining the electric energy of the incorrect wiring of the electric energy meter is to calculate the correction coefficient according to the expression formula of the incorrect wiring power and the expression formula of the correct wiring power, and then calculate the electrical quantity of the electrical...
Claims
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IPC IPC(8): G01R22/00
Inventor 范洁黄奇峰陈霄周玉蔡奇新陈刚易永仙金在冬李建红
Owner STATE GRID CORP OF CHINA