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Calibration method of three-phase electric energy meter

A three-phase electric energy meter, electric energy meter technology, applied in the direction of measuring electrical variables, measuring devices, instruments, etc., can solve the problems of taking up a lot of time, difficult to operate, and the reliability of the pulse acceleration method is not very good, so as to reduce the production difficulty, The effect of improving production efficiency

Active Publication Date: 2012-06-27
宁夏隆基宁光仪表股份有限公司
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  • Application Information

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Problems solved by technology

[0002] In recent years, in the context of smart grid transformation, smart energy meters are in great demand as an indispensable device for smart grids. In the production of traditional three-phase smart energy meters, the pulse adjustment method is generally used for the adjustment of smart energy meters. , the pulse adjustment method has the advantages of stability and accuracy, but the pulse adjustment method takes a lot of time, especially when adjusting the light load point of a high-precision electric energy meter, although it can be reduced by means of pulse acceleration However, the reliability of the pulse acceleration method is not very good, and it is not easy to operate, which makes the production of three-phase smart energy meters difficult and inefficient.

Method used

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  • Calibration method of three-phase electric energy meter

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Embodiment Construction

[0013] The principle of the inventive method is as follows:

[0014] 1. Calculation of standard voltage, current and active power values:

[0015] (1), calculate and select the standard voltage RMS register value

[0016] When the voltage is rated input, the standard voltage RMS register value should be convenient for MCU to convert to LCD display value, and should be within the reasonable range of channel phase 1.0Ib.

[0017] Assume that when the rated voltage is input Un, the effective value of the voltage at the input terminal of the chip voltage channel is Vu, and the theoretically calculated value is U 理论 , the MCU converts the LCD display value to U 示值 , the standard voltage RMS register value is U 标准 , then U 标准 The selection should meet the following conditions:

[0018] 0.8标准 / U 理论 <1.2

[0019] K=U 标准 / U 理论 , K should be an integer and convenient for MCU conversion

[0020] The above-mentioned first condition ensures that the U channel phase 1.0Ib is withi...

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Abstract

The invention relates to a calibration method of a three-phase electric energy meter. The calibration method comprises the following steps that: (1) first taking a voltage current source of which the accuracy class is higher than the class requested by a tested electric energy meter, a PC (Personal Computer) machine used for issuing synchronous orders for the voltage current source and the electric energy meter, a mother meter as a reference and a three-phase electric energy meter needing to be calibrated; (2) the PC machine reads a measurement parameter data of the mother meter through an RS 485 communicating interface to be synchronous with the calibrated three-phase electric energy meter, and the parameter setting of the calibrated three-phase electric energy meter is realized; and (3) the voltage current source PF is equal to 0.5L, wherein when the voltage current source outputs rated voltage and current, the PC machine broadcasts calibrating voltage, calibrating current, a channel gaining order of an A phase, a B phase and C phase and a phase correction order for the calibrated three-phase electric energy meter. The invention discloses an automatic calibration method of a three-phase intelligent electric energy meter, which combines a meter calibrating method with power and a traditional meter calibrating method with pulses. Therefore, the production difficulty of the three-phase intelligent electric energy meter is greatly reduced, and the production efficiency is increased.

Description

technical field [0001] The invention relates to a method for adjusting a three-phase electric energy meter. Background technique [0002] In recent years, in the context of smart grid transformation, smart energy meters are in great demand as an indispensable device for smart grids. In the production of traditional three-phase smart energy meters, the pulse adjustment method is generally used for the adjustment of smart energy meters. , the pulse adjustment method has the advantages of stability and accuracy, but the pulse adjustment method takes a lot of time, especially when adjusting the light load point of a high-precision electric energy meter, although it can be reduced by means of pulse acceleration However, the reliability of the pulse acceleration method is not very good, and it is not easy to operate, which makes the production of three-phase smart energy meters difficult and inefficient. Contents of the invention [0003] The purpose of the present invention is...

Claims

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Application Information

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IPC IPC(8): G01R35/04
Inventor 杨杰
Owner 宁夏隆基宁光仪表股份有限公司
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