Method for detecting leakage of explosion-proof distribution box

By constructing eddy current compensation factors and multi-modal sensors in explosion-proof distribution boxes, the problem of leakage signal attenuation caused by eddy currents in metal casings is solved, improving the sensitivity of low-current leakage detection and fault response speed, and meeting the safety requirements of flammable and explosive environments.

CN120802119BActive Publication Date: 2026-05-05ZHEJIANG GUIWEI LIGHTING TECH CO LTD
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Patent Information

Application Number
CN202511234906.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-09-01
Publication Date
2026-05-05
Estimated Expiration
2045-09-01

AI Technical Summary

Technical Problem

The metal casing of existing explosion-proof distribution boxes generates eddy currents under alternating magnetic fields, which leads to distortion and attenuation of leakage current detection signals. In particular, the sensitivity of leakage current detection decreases, making it difficult to meet the safety protection requirements of flammable and explosive environments.

Method used

By constructing an eddy current compensation factor to compensate for the gain of leakage current signal, and combining multimodal sensing of temperature distribution and three-dimensional magnetic field components, a thermo-magnetic coupling analysis model is established, compensation parameters are dynamically adjusted, and leakage current faults are detected by using the area fraction of the curl of the spatial magnetic field.

Benefits of technology

It significantly improves the detection sensitivity of minute leakage currents, achieves millisecond-level fault response, and meets the safety protection requirements of explosive environments.

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Abstract

This invention discloses a leakage current detection method for explosion-proof distribution boxes, specifically relating to the field of electrical safety technology in flammable and explosive environments. It addresses the problems of leakage signal attenuation and insufficient detection sensitivity caused by the eddy current effect of metal explosion-proof enclosures. The method acquires the original leakage current signal from the wires inside the box and constructs an eddy current compensation factor based on the enclosure material and thickness for gain compensation. Simultaneously, it collects the surface temperature distribution and three-dimensional magnetic field components of the enclosure, and determines the compensation failure state through collaborative analysis of the high-temperature region migration acceleration and magnetic field polarization angle offset. When compensation is effective, it calculates the area fraction of the spatial magnetic field curl on the enclosure surface; when its temporal gradient exceeds a preset threshold, it triggers a tripping action, overcoming the shielding effect of the enclosure eddy current on weak leakage current signals, and achieving high-sensitivity leakage current protection while maintaining explosion-proof integrity.
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