Electric energy small-signal measuring and calibrating method and device
A technology of electric energy measurement and small signal, which is applied in the direction of measuring devices, measuring electric variables, instruments, etc., can solve the problems of large dispersion of small signal characteristics, and can not guarantee the qualified rate of electric energy measurement results, so as to reduce production costs and simplify the calibration method Ease of operation and the effect of reducing the failure rate
Active Publication Date: 2013-09-18
BEIJIG YUPONT ELECTRIC POWER TECH
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However, when the number of electric energy metering products is large, the setting of fixed values cannot guarantee the qualified rate of electric energy metering results of all electric energy metering products at small signals due to the large dispersion of small signal characteristics among electric energy metering products.
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[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0032] In order to perform small-signal compensation in a targeted manner according to the circuit characteristics of different electric energy metering products, and improve the metering accuracy of electric energy metering products during small-signal metering, the embodiment of the present invention provides a small-signal metering and calibration method for electric energy, such as image 3 As shown, its processing flow may include:
[0033] Step 301, after the electric energy metering product is powered on, read the value of the power gain register (Active Power ...
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The invention discloses an electric energy small-signal measuring and calibrating method and device. The method comprises the following steps of: reading the value of a power gain register and the measuring value of an active power register in an electric energy measuring product after the electric energy measuring product is energized; reading the error value of the electric energy measuring product, which is measured by a standard meter; calculating the offset register data of an active offset correction register in the electric energy measuring product according to the read value of the power gain register, the read measuring value of the active power register and the read error value of the electric energy measuring product; and writing negative offset register data acquired through calculation into the active offset correction register after the active offset correction register is reset. The invention can greatly improve the calculation accuracy of the electric energy measuring product in small-signal measurement.
Description
technical field [0001] The invention relates to the technical field of measuring instruments and electric energy measurement, in particular to a method and device for measuring and calibrating small electric energy signals. Background technique [0002] Electric energy metering products that use dedicated multifunctional electric energy metering chips as the core device for electric energy metering generally encounter the problem of out-of-tolerance electric energy metering results caused by increased signal-to-noise ratios when measuring small signals. figure 1 Recommended circuit diagram for RN8209 energy metering chip. Taking the RN8209 electric energy metering chip as an example, under the condition of good wiring, the active and reactive power error accuracy of <0.1% can be achieved at dynamic 1500:1. However, there are many situations that will affect the accuracy of small signals, make it worse, and even exceed the error limit threshold, which is the so-called ove...
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IPC IPC(8): G01R35/04
Inventor 杨中河
Owner BEIJIG YUPONT ELECTRIC POWER TECH