高准确度电流比较仪研制及校验方法研究

doi:10.3969/j.issn.1000-1158.2025.01.18

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Abstract The structure and working principle of a new type of high accuracy current comparator are introduced， and the circuit structure of "shielded directional drainage" is proposed. The structure can basically eliminate the secondary winding capacitive leakage error， and eliminate the additional error introduced in the combination of the secondary winding， and improve the accuracy of the current comparator. In the range of current ratio 5 A/5 A ~ 5 000 A/5 A， the technical index achieved is better than 1×10^-6. According to the characteristics of the "shielded directional drainage" circuit structure， the self-calibration method of multi-ratio current comparator is further proposed， and its calibration uncertainty is better than 2×10^-7. This method has the advantages of high accuracy， good stability， simple operation and short time operation， which can effectively solve the long distance transportation and inspection problems of transformers in the past.

Key words： electrical metrology current ratio current comparator shielded directional drainage self-calibration method

Received: 27 May 2024 Published: 14 January 2025

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TB971

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	Articles by authors
	WANG Wei
	LIU Xia
	HUANG Lu
	YANG Yan

Cite this article:

WANG Wei,LIU Xia,HUANG Lu, et al. Research on High Accuracy Current Comparator and Self-calibration Methods[J]. Acta Metrologica Sinica, 2025, 46(1): 112-118.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2025.01.18 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2025/V46/I1/112

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