Design of Integrated Current Transformer for Measurement and Energy Harvesting in Distribution Line Monitoring

Xinyi Chen; Yi Yang

doi:10.47297/taposatWSP2633-456926.20260708

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Design of Integrated Current Transformer for Measurement and Energy Harvesting in Distribution Line Monitoring

Volume 7, Issue 8

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Design of Integrated Current Transformer for Measurement and Energy Harvesting in Distribution Line Monitoring
Design of Integrated Current Transformer for Measurement and Energy Harvesting in Distribution Line Monitoring
1.University of Shanghai for Science and Technology, Shanghai, 200093, China
2.Nanjing Institute of Technology, Nanjing, Jiangsu, 211167, China
Vol. 7, Issue 8, Pages: 132-135(2026)
Published：30 August 2026
DOI：10.47297/taposatWSP2633-456926.20260708
Accepted：

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Chen Xinyi,Yang Yi.Design of Integrated Current Transformer for Measurement and Energy Harvesting in Distribution Line Monitoring[J].Theory and Practice of Science and Technology,2026,07(08):132-135.
DOI：

Chen Xinyi,Yang Yi.Design of Integrated Current Transformer for Measurement and Energy Harvesting in Distribution Line Monitoring[J].Theory and Practice of Science and Technology,2026,07(08):132-135. DOI： 10.47297/taposatWSP2633-456926.20260708.

摘要

Abstract

To meet the needs for current measurement and autonomous power supply in distributed distribution-line monitoring nodes

this paper designs an integrated current transformer for measurement and energy harvesting. The device uses one magnetic core and one secondary winding. The primary has one turn and the secondary has 600 turns. Mode switching enables time-multiplexed energy harvesting and current measurement. During normal operation

the secondary winding is connected to the energy-harvesting path for 10 s. The circuit performs rectification

energy storage

and power management. It then switches to the measurement path for 5 s. A 50 mΩ sampling resistor converts the secondary current into a voltage signal. A 24-bit analog-to-digital converter samples the signal at 4 kS/s. A sinusoidal fit is used to extract the voltage amplitude. A calibration relationship converts the amplitude into the primary current

and the result is transmitted through LoRa. Experiments show that the energy-harvesting module completes energy storage

load connection

overvoltage cutoff

and recovery at a primary current of 35.3 A. From 50 to 600 A at 50 Hz

the maximum relative indication error is 0.32%. In an open line-of-sight environment

the wireless communication distance is about 490 m. The device uses the same current transformer for time-multiplexed energy harvesting

current measurement

and wireless data transmission. It can be used for distributed online monitoring of distribution lines.

关键词

Keywords

references

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