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Article

Electroluminescent Sensing Coating for On-Line Detection of Zero-Value Insulators in High-Voltage Systems

by
Yongjie Nie
1,†,
Yihang Jiang
2,†,
Pengju Wang
2,†,
Daoyuan Chen
1,
Yongsen Han
3,
Jialiang Song
3,
Yuanwei Zhu
2,* and
Shengtao Li
2,*
1
Electric Power Research Institute, Yunnan Power Gird Co., Ltd., Kunming 650217, China
2
State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
3
Key Laboratory of Engineering Dielectrics and Its Application, Harbin University of Science and Technology, Ministry of Education, Harbin 150080, China
*
Authors to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Appl. Sci. 2025, 15(14), 7965; https://doi.org/10.3390/app15147965
Submission received: 1 June 2025 / Revised: 9 July 2025 / Accepted: 16 July 2025 / Published: 17 July 2025
(This article belongs to the Special Issue Advances in Electrical Insulation Systems)
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This paper introduces an electroluminescent sensing strategy for the real-time detection of zero-value insulators in high-voltage transmission systems. By integrating ZnS:Cu electroluminescent coatings onto insulator surfaces, this methodology provides a naked-eye-observable, on-line, diagnostic strategy for monitoring insulation health. Such an approach could be easily adapted to high-voltage equipment, offering convenient fault detection and maintenance capabilities in electrical infrastructures.

Abstract

In high-voltage transmission lines, insulators subjected to prolonged electromechanical stress are prone to zero-value defects, leading to insulation failure and posing significant risks to power grid reliability. The conventional detection method of spark gap is vulnerable to environmental interference, while the emerging electric field distribution-based techniques require complex instrumentation, limiting its applications in scenes of complex structures and atop tower climbing. To address these challenges, this study proposes an electroluminescent sensing strategy for zero-value insulator identification based on the electroluminescence of ZnS:Cu. Based on the stimulation of electrical stress, real-time monitoring of the health status of insulators was achieved by applying the composite of epoxy and ZnS:Cu onto the connection area between the insulator steel cap and the shed. Experimental results demonstrate that healthy insulators exhibit characteristic luminescence, whereas zero-value insulators show no luminescence due to a reduced drop in electrical potential. Compared with conventional detection methods requiring access of electric signals, such non-contact optical detection method offers high fault-recognition accuracy and real-time response capability within milliseconds. This work establishes a novel intelligent sensing paradigm for visualized condition monitoring of electrical equipment, demonstrating significant potential for fault diagnosis in advanced power systems.
Keywords: electroluminescence; high-voltage; zero-value insulator; on-line monitoring electroluminescence; high-voltage; zero-value insulator; on-line monitoring

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MDPI and ACS Style

Nie, Y.; Jiang, Y.; Wang, P.; Chen, D.; Han, Y.; Song, J.; Zhu, Y.; Li, S. Electroluminescent Sensing Coating for On-Line Detection of Zero-Value Insulators in High-Voltage Systems. Appl. Sci. 2025, 15, 7965. https://doi.org/10.3390/app15147965

AMA Style

Nie Y, Jiang Y, Wang P, Chen D, Han Y, Song J, Zhu Y, Li S. Electroluminescent Sensing Coating for On-Line Detection of Zero-Value Insulators in High-Voltage Systems. Applied Sciences. 2025; 15(14):7965. https://doi.org/10.3390/app15147965

Chicago/Turabian Style

Nie, Yongjie, Yihang Jiang, Pengju Wang, Daoyuan Chen, Yongsen Han, Jialiang Song, Yuanwei Zhu, and Shengtao Li. 2025. "Electroluminescent Sensing Coating for On-Line Detection of Zero-Value Insulators in High-Voltage Systems" Applied Sciences 15, no. 14: 7965. https://doi.org/10.3390/app15147965

APA Style

Nie, Y., Jiang, Y., Wang, P., Chen, D., Han, Y., Song, J., Zhu, Y., & Li, S. (2025). Electroluminescent Sensing Coating for On-Line Detection of Zero-Value Insulators in High-Voltage Systems. Applied Sciences, 15(14), 7965. https://doi.org/10.3390/app15147965

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