A High-Performance Hybrid Current Transformer Based on a Fast Variable Optical Attenuator

Pu, Wei; Cheng, Cheng; Wang, Xuefeng; Shan, X.; Sun, Xiaohan

doi:10.1109/tpwrd.2014.2322656

Cited by 10 publications

(2 citation statements)

References 20 publications

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“…Current sensors are key components in the monitoring system and are generally designed to detect magnetic field induced by the current in power cords. Previously, various current sensors for singlewire power cords including current transformer [2]- [4], Rogowski coil [5], [6], Hall effect [7]- [9], GMR [10], Faraday effect [11], [12], magnetoelectric composites [13] and so on have been developed, These sensors are designed to detect the magnetic field with closed field lines surrounding a wire. However, the end-use appliance is usually accompanied with a two-wire power cord which carries opposite currents in the live and neutral wires.…”

Section: Introductionmentioning

confidence: 99%

Nonintrusive Current Sensor for the Two-Wire Power Cords

Zhang

Wen

2015

IEEE Trans. Magn.

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This paper presents a nonintrusive current sensor for two-wire power cords connected to household and commercial appliances. The sensor uses a gapped magnetic core surrounding the power cord to constrain the distribution of the magnetic field induced by the current. The magnetic fields in four air gaps of the magnetic core are respectively measured by four magnetoresistive (MR) sensors. The current in the power cord and the rotation angle of the power cord around its central axis are calculated together by the output voltages of four MR sensors. The current sensor encircles the power cord without any alignment process, and can detect current nonintrusively in two-wire power cords of any type such as zip-cord or nonmetallic sheathed cable. The experimental results show that the nonlinearity of the sensor is ±1.5% for the current range from 0A to 20A with the maximum error limited to ±1.8%, this sensor is ideally suited for measuring end-use of electric power in residential and commercial areas.Index Terms-nonintrusive current sensor, two-wire power cord, gapped magnetic core, magnetoresistive sensor. 0018-9464 (c)

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Section: Introductionmentioning

confidence: 99%

Nonintrusive Current Sensor for the Two-Wire Power Cords

Zhang

Wen

2015

IEEE Trans. Magn.

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“…Besides the four methods summarised above, there are a number of novel current sensors for current measurement, including optical CTs [30][31][32], fluxgate CTs [33,34] and magnetic sensor based CTs [35][36][37][38]. In fact, these novel current sensors are not widely applied in power grids.…”

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confidence: 99%

A novel measurement‐protection‐integrated current transformer based on hybrid core and magnetic field sensor

Zhang,

Chen,

Tian

et al. 2024

IET Electric Power Appl

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Current transformers (CTs) are widely used for energy metering, relay protection, condition monitoring and control circuits. However, CT saturation may lead to non‐negligible measurement errors and relay malfunctions, posing a threat to the stability and security of the power grid. In order to address the problem of CT saturation, a novel measurement‐protection‐integrated current transformer (MPICT) is proposed. First, the working states of the MPICT are summarised and the approximate expressions for the steady‐state measuring characteristics, the transient response characteristics, and the measurement errors are derived from the equivalent circuit model. Then, the feasibility of the MPICT and the theoretical analyses are verified by the 3D FEM simulation imitating the presented MPICT excited by diverse currents. Finally, a down‐scale prototype is fabricated and a series of tests are conducted in the laboratory to validate the effectiveness of the equipment. The simulation and experimental results suggest that the output of the MPICT can accurately reconstruct the primary current waveform, even if the primary current contains decaying or constant DC component.

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