A method for calibrating measurement accuracy of smart electric energy meters with self-adaptive dynamic adjustment
A smart electric energy meter and dynamic adjustment technology, applied in the measurement of electrical variables, measuring devices, instruments, etc., can solve problems such as large deviation, and achieve the effect of improving measurement accuracy
Active Publication Date: 2020-12-01
NARI TECH CO LTD +1
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[0004] Most existing calibration methods usually adjust the standard source to I b point (that is, the voltage is equal to the rated voltage U n , the current is equal to the rated current I n , power factor is equal to 0.5L), and perform one-time calculation and writing to all calibration-related registers. This method is simple and efficient, and can also ensure that the I b point of metering accuracy, however, in most of the time in practical applications, the voltage, current and power factor cannot be maintained at I b point, especially in the case of small currents, the deviation is large
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[0027] This specific embodiment discloses a method for calibrating the measurement accuracy of an intelligent electric energy meter with adaptive dynamic adjustment, such as figure 2 shown, including the following steps:
[0028] S1: In the current measurement range of the electric energy meter, the rated current I n As a benchmark, the current is divided into several segments with equal numbers in the direction of current increase and current decrease; specifically, as figure 1 As shown, in the direction of current increase, set 2 thresholds I H1 , I H2 ;In the direction of current decrease, set 2 thresholds I L1 , I L2 ; where, I L1 H1 n L2 H2 . Divide the current into three segments: small, medium and large. Generally, the I n Set to the middle value in the middle current range.
[0029] S2: In the working voltage range of the electric energy meter, the rated voltage U n As a benchmark, select several voltage test points. Specifically, the voltage working range o...
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The invention discloses an intelligent electric energy meter measuring accuracy calibration method with self-adaption dynamic regulation. The method of current segmenting and voltage selecting is used, a plurality of calibration points are arranged, and all the voltage and current conditions in the working range of the electric energy meter are basically covered. Each calibration method is independently calculated, and the calibration value is refreshed in real time according to the actual operation of the electric energy meter. Compared with the traditional method of one calibration point, measuring accuracy in actual electricity environment of the electric energy meter is greatly improved.
Description
technical field [0001] The invention relates to the field of calibration of smart electric energy meters, in particular to a method for calibrating measurement accuracy of intelligent electric energy meters. Background technique [0002] In recent years, with the large-scale popularization of smart energy meters, the residents' experience of using electricity has undergone earth-shaking changes, providing strong support for the development of smart grids. Electric energy measurement is the core function of smart electric energy meters, and efforts to improve measurement accuracy are the key links to make smart electric energy meters well. The new generation of smart energy meters uses the pulse method to measure electric energy. The mains power is converted into a sampling signal by the sampling circuit and input to the metering chip. When the input electric energy of the metering chip reaches the preset metering constant, the metering chip outputs a pulse to the MCU, MCU C...
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IPC IPC(8): G01R35/04
CPCG01R35/04
Inventor 王冠男熊剑许金宇曹子涛舒畅菅利彬全巧艳魏巍吴戈左勇王太平
Owner NARI TECH CO LTD