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Three-phase electric quantity calculation method and apparatus thereof

A technology of three-phase current and three-phase voltage, which is applied in the field of electric power, can solve the problems of low degree of intelligence of the power grid, wiring errors, and failure to correct in real time, and achieve the effect of high degree of intelligence

Active Publication Date: 2012-09-26
SHENZHEN RENERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] The purpose of the embodiments of the present invention is to provide a three-phase electricity calculation method, which aims to solve the problem of low intelligence in the power grid due to the fact that wiring errors cannot be corrected in real time in the electricity calculation in the prior art

Method used

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  • Three-phase electric quantity calculation method and apparatus thereof
  • Three-phase electric quantity calculation method and apparatus thereof
  • Three-phase electric quantity calculation method and apparatus thereof

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Embodiment 1

[0054] This embodiment provides a three-phase electricity calculation method, which is completed by a three-element electric energy meter. The structure of the electric energy metering chip in the three-phase electric energy meter is as follows: Figure 5 (where, if Figure 5 The power metering sub-module and the electric energy metering sub-module in can be collectively referred to as the electric energy metering module) as shown, the hardware structure diagram of the wrong-phase correction sub-module is shown in image 3 As shown, the specific structure of the reverse correction sub-module is as follows Figure 4 as shown in image 3 As shown, voltage misphase correction is composed of three multiplexers 301, 302, 303 and U channel selection module 304; current misphase correction is composed of three multiplexers 305, 306, 307 and I channel selection module 308 composition. The voltage multiplexer 301, 302, 303 selects the voltage channel for metering, such as the voltag...

Embodiment 2

[0056] This embodiment provides a three-phase electricity calculation device, the device is as Image 6 shown, including:

[0057] The wrong connection detection module 61 is used to detect the angle and amplitude of the three-phase voltage and three-phase current, form a vector diagram according to the angle and amplitude of the three-phase voltage and three-phase current, and judge the three-phase electricity meter according to the vector diagram. wiring;

[0058] The error correction module 62 is used to adjust the wiring of the three-phase electric energy meter to the correct wiring according to the wiring when judging that the wiring is wrong,

[0059] The electric energy metering module 63 is used for measuring the electric energy of the three-phase electric energy meter;

[0060] Wrong connection detection module 61 specifically comprises:

[0061] Angle measurement sub-module 611, used to detect the angle of three-phase current and voltage;

[0062] The amplitude m...

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Abstract

The invention is suitable for the electric power field and provides a three-phase electric quantity calculation method and an apparatus thereof. The method comprises the following steps: detecting angles and amplitudes of a three-phase voltage and a three-phase current; forming a vector diagram according to the angles and the amplitudes of the three-phase voltage and the three-phase current and determining wiring of a three-phase electric energy meter according to the vector diagram; if false wiring is determined, calculating electric energy of the three-phase electric energy meter after the wiring of the three-phase electric energy meter is corrected to be the right wiring according to the wiring. By using the technical scheme provided in the invention, on-site measurement is not needed. According to the vector diagram provided by a metering chip, a grid company can discover the false wiring in real time and correct in real time. An intelligent degree is high.

Description

technical field [0001] The invention belongs to the field of electric power, and in particular relates to a method and device for calculating three-phase electric quantity. Background technique [0002] Three-phase four-wire electric energy meters (also known as three-element electric energy meters) need to calculate active power, reactive power and apparent power, and integrate them to realize active energy metering, reactive energy metering and apparent energy metering. Such as figure 1 Shown is a schematic diagram of correct wiring of a three-phase four-wire electric energy meter (hereinafter referred to as electric energy meter) in the prior art. TA1, TA2, and TA3 are the primary side current transformers, and the primary side passes the A-phase current B-phase current and phase C current The secondary side passes the A-phase current B-phase current and phase C current The measured current is input to the input terminal of the current channel of the electric...

Claims

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Application Information

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IPC IPC(8): G01R21/06G01R11/48
Inventor 刘凯苗书立邱红霞
Owner SHENZHEN RENERGY TECH
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