What question did this study set out to answer?

Evaluate the capability of metal magnetic memory testing (MMMT) to detect hidden mechanical discontinuities in ultra-high-voltage ACSR conductor steel cores under various lift-off and orientation conditions.

August 19, 2026NDTOpen Access

Metal Magnetic Memory-Based Electromagnetic Non-Destructive Evaluation of Steel-Core Damage in UHV ACSR Conductors

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Authors

YTYulin TengElectric Power Research Institute HLHui LiElectric Power Research Institute HSHebin SunElectric Power Research Institute

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Implication

Laboratory study demonstrates magnetic memory testing detects internal steel-core flaws in transmission conductors, suggesting potential for non-destructive screening.

Key Points

Evaluate the capability of metal magnetic memory testing (MMMT) to detect hidden mechanical discontinuities in ultra-high-voltage ACSR conductor steel cores under various lift-off and orientation conditions.
Tested one intact and five artificially damaged 1 m seven-strand ACSR steel-core specimens preloaded to 16 kN for 2 min before unloading.
Scanned specimens using the normal magnetic-field component on Channel 1 of a TSC-1M-4 detector across four lift-off distances (5, 20, 30, and 40 mm), two orthogonal orientations, and an aluminum-tube cover.
At 5 mm lift-off, peak-to-peak amplitudes ranged from 18.7 to 91.4 A/m, with repositioning coefficients of variation between 0.83% and 8.04%.
Increasing lift-off distance reduced signal amplitude substantially, showing descriptive mean amplitude losses of 66.3% at 20 mm, 81.9% at 30 mm, and 89.8% at 40 mm compared to 5 mm.
Damage signatures remained detectable through the aluminum-tube covering, while specimen orientation modified signal polarity and amplitude.

Cite This Study

Teng et al. (2026) studied this question.

synapsesocial.com/papers/6a85638803308d306e2d6b43 https://doi.org/10.3390/ndt4030025

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Implication

Laboratory study demonstrates magnetic memory testing detects internal steel-core flaws in transmission conductors, suggesting potential for non-destructive screening.

Metal Magnetic Memory-Based Electromagnetic Non-Destructive Evaluation of Steel-Core Damage in UHV ACSR Conductors

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Key Points

Cite This Study

Metal Magnetic Memory-Based Electromagnetic Non-Destructive Evaluation of Steel-Core Damage in UHV ACSR Conductors

Discussion

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Implication

Key Points

Cite This Study

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