A high-accuracy current comparator and self-calibration method

Abstract

The invention provides a high-accuracy current comparator and a self-checking method and belongs to the field of alternating current precision measurement. The high-accuracy current comparator comprises an iron core, a primary winding W11, a primary compensation grounding winding W12, a secondary winding W21, a secondary compensation winding W22 and a detection winding WD, wherein the primary winding W11, the primary compensation grounding winding W12, the secondary winding W21, the secondary compensation winding W22 and the detection winding WD are wound on the iron core. The primary winding has three groups of input terminals. The number of turns of the primary winding connected with the three groups of input terminals increases tenfold. The secondary winding is divided into M sections of sub-windings, wherein each section of sub-winding is provided with two taps and the number of turns of each section of sub-winding is the same with that of the primary winding La3-Lb. Each section of sub-winding of the secondary winding is connected in series through the tap. Two taps connected in series of the adjacent two sections of sub-windings form an end. All ends of the secondary winding is numbered sequentially from the first section, the number being from 0 to M. The number of sections of the secondary winding connected in the secondary winding input terminals is changed through a band switch.

Description

technical field [0001] The invention belongs to the field of precision measurement of alternating current ratio, and in particular relates to a high-accuracy current comparator and a self-checking method. Background technique [0002] AC current ratio technology plays a very important role in modern AC measurement, especially when there is a high requirement for measurement accuracy, it is usually realized by ratio technology. Moreover, the AC current ratio technology has a wide range of applications, and the importance of the AC current ratio technology is increasing day by day as energy-saving technology is increasingly concerned. [0003] After the unit system of various physical quantities is established, the measurement process of any physical quantity is actually to find out how many times the measured physical quantity X is equal to its unit A, that is, to determine the measured quantity and the standard quantity as the unit. The ratio between the value K of the proc...

AI Technical Summary

Problems solved by technology

It can be seen that although the principle of this calibration method is correct, it is not feasible and cannot be popularized.

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