Analysis of failure causes and research on improvement measures for external constant magnetic field testing of electric energy meters

Le résumé fourni par la source

The external constant magnetic field test is a pivotal method for evaluating the magnetic interference immunity of electricity meters, with its test results critically determining the metrological accuracy and operational reliability in real-world applications. This study conducts a systematic analysis of failure mechanisms in electricity meters during external constant magnetic field testing, identifying three primary failure causes: (1) structural design deficiencies, including inadequate magnetic shielding design and improper magnetic material selection; (2) magnetic susceptibility of critical components, evidenced by magnetic saturation effects in current sensors and parasitic interference from magnetic elements; and (3) circuit design flaws, characterized by insufficient anti-interference circuitry and defective grounding/shielding systems. Based on the failure mechanism analysis, this study proposes improvement strategies encompassing optimized magnetic shielding design, adoption of high magnetic-resistance materials, and enhanced circuit-level interference immunity. Experimental results demonstrate that material-based solutions outperform software algorithm optimizations in effectively addressing test failures. The enhanced prototype successfully passed the external constant magnetic field test (400 mT ± 10 mT), with all performance metrics fully complying with the IEC 62052 series of international standards and GB/T 17215 series of national standards. This research provides both theoretical foundations and practical guidance for ensuring stable operation of electricity meters in complex electromagnetic environments.

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