A high-protection electric energy metering box control method and system and related device

By using a controllable switch in the power metering box to disconnect at the voltage zero-crossing point and then reconnect after a delay, the residual voltage attenuation waveform can be obtained for comparison. This solves the problem of difficult detection of line connection degradation, enables online diagnosis and repair, and improves power supply reliability and protection capabilities.

CN122449431APending Publication Date: 2026-07-24SHENHENG ELECTRIC EQUIP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENHENG ELECTRIC EQUIP CO LTD
Filing Date
2026-06-26
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing electricity metering boxes lack effective online sensing methods for line connection deterioration, making it difficult to detect early problems such as joint oxidation and increased contact resistance without affecting power supply continuity, which could lead to potential overheating or fire risks.

Method used

When the load current is less than a preset threshold, a controllable switch is used to disconnect at the voltage zero-crossing point and then reconnect after a delay to obtain the residual voltage decay waveform. This waveform is then compared with a reference waveform to extract the decay characteristic deviation, actively diagnose the line connection status, achieve online diagnosis, and perform micro-power outage repair when necessary.

Benefits of technology

It enables timely detection and handling of line connection deterioration without affecting users' power consumption, improving the active protection capability and power supply reliability of the power metering box, and reducing maintenance workload and potential accident risks.

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Abstract

The application discloses a kind of high protection electric energy metering box control method, system and related device, belong to control technical field, when at least one outgoing line branch load current is less than preset diagnosis threshold, determine that the branch is to be diagnosed branch;It is carried out alternating voltage zero-crossing detection and obtains zero-crossing synchronization signal;Zero-crossing synchronization signal is controlled based on and controllable switch is opened at voltage zero-crossing point;After the preset delay of less than half power frequency period, it is connected in subsequent voltage zero-crossing point;Obtain the residual voltage decay waveform of the outgoing line side of to-be-diagnosed branch in the delay time;It is compared with reference decay waveform, and first attenuation characteristic deviation is obtained;When first attenuation characteristic deviation exceeds preset abnormal threshold, it is determined that there is line connection deterioration.Through active manufacturing micro power-off excitation, diagnosis information is obtained, on-line line deterioration diagnosis under non-fault condition is realized, does not affect normal power utilization of user, and the active protection capability and power supply reliability of electric energy metering box are improved.
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