Auto-calibration method for single-phase electric energy meter on-site calibrator split-core type current mutual inductor
A current transformer and automatic calibration technology, which is applied in the field of calibration, can solve the problems of cumbersome calibration of clamp current transformers and increase the pressure of after-sales service of manufacturers, and achieve the effect of reducing complexity and improving convenience
Inactive Publication Date: 2009-10-14
SHENZHEN CLOU ELECTRONICS
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Problems solved by technology
Because the calibration of the clamp current transformer is cumbersome, the general user is through the manufacturer, which increases the pressure of the manufacturer's after-sales service
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[0011] Such as figure 1 As shown, the present invention provides a method for automatic calibration of a current clamp transformer of a single-phase electric energy meter field calibrator, which introduces a signal switch into the original circuit, and selects different input signals to the AD through the microprocessor control signal switch Converter, where the current channel has a direct measurement channel and multiple clamp-on current transformer measurement channels.
[0012] The automatic calibration method of the current clamp transformer of the single-phase electric energy meter field calibrator comprises the following steps:
[0013] 1. signal switch is set, this signal switch is connected with microprocessor, AD converter, current transformer and current transformer signal conditioning circuit and current clamp transformer and current clamp transformer signal conditioning circuit respectively, described The input current of the current transformer and the current c...
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The invention provides an auto-calibration method for a single-phase electric energy meter on-site calibrator split-core type current mutual inductor, which comprises the following steps of: A. setting a signal switch and connecting the signal switch with a microprocessor, an AD converter, the signal conditioning circuit of a current mutual inductor and the signal conditioning circuit of a split-core type current mutual inductor respectively; B. providing test current for the current mutual inductor and the split-core type current mutual inductor; C. leading the microprocessor to control the signal switch for achieving the collection for the current signals of different channels, and calculating the amplitude and the phase; and D. taking the directly measured current data, namely the alternative current signal of the current mutual inductor, as the standard, and calculating the amplitude and the phase parameter which are required to be amended by the split-core type current mutual inductor. The auto-calibration method for the single-phase electric energy meter on-site calibrator split-core type current mutual inductor improves the calibration convenience of the split-core type current mutual inductor, reduces the calibration complexity for the users and manufacturers, and leads the calibration of the split-core type current mutual inductor to be capable of being implemented in the user site.
Description
technical field [0001] The invention relates to a calibration method, in particular to an automatic calibration method for single-phase electric energy meter field. Background technique [0002] Single-phase electric energy meter field calibrator often uses clamp current transformer to measure the current signal of electric energy meter. At present, clamp current transformer has low precision, poor repeatability and poor stability, so it needs to be calibrated frequently. Single-phase electric energy meter field calibrator generally has the method of direct current measurement, and single-phase electric energy meter field calibrator usually uses clamp current transformer. At present, the precision of clamp current transformer is low, the repeatability is poor, and the stability is not stable. Well, calibration is often required. The current direct measurement method adopts high-precision transformer, which has high measurement accuracy and good stability, and can guarantee ...
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IPC IPC(8): G01R35/02G01R35/04
Inventor 曹锋
Owner SHENZHEN CLOU ELECTRONICS