Semi-Contactless Power Measurement Method for Single-Phase Enclosed Two-Wire Residential Entrance Lines

Liu, Xiaohu; He, Wei; Guo, Pan; Yang, Yuhang; Guo, Taoning; Xu, Zheng

doi:10.1109/tim.2022.3186076

Cited by 9 publications

(4 citation statements)

References 23 publications

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“…Zhang et al used four three-dimensional TMR sensors to measure the magnetic fields around a single conductor with a circular cross-section, and achieved the accurate position and tilt angle of the measured conductor, and realized the on-line calibration of the current sensor [ 16 ]. Liu et al used seven TMR sensors to form a half-ring structure for measuring the current of a single-phase inlet line, and realized the online calibration of the current sensor [ 17 ]. However, the abovementioned online calibration method needs more magnetic sensors to construct a redundant set of equations and realizes inverse computation, significantly increasing the complexity and cost of the whole current sensor system.…”

Section: Introductionmentioning

confidence: 99%

Non-Contact Current Measurement for Three-Phase Rectangular Busbars Using TMR Sensors

Su,

Li,

Liang

et al. 2024

Sensors

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This paper proposes a non-contact current measurement method for three-phase rectangular busbars based on TMR (tunneling magneto-resistance) sensors, due to their advantages of large dynamic range, wide bandwidth, light weight, and easy installation. A non-contact current sensor composed of only three TMR sensors is developed and the TMR sensors are respectively placed at a location with a certain distance from the surface of each rectangular busbar to measure the magnetic fields generated by the busbar currents. To calibrate the developed current sensor, i.e., to establish the relationship between the magnetic fields measured by the TMR sensors and the currents flowing in the three-phase rectangular busbars, we designed a thyristor-controlled resistive load as a calibrator, which is connected to a downstream branch of the distribution cabinet. By switching the resistive load, a calibration current, which can be identified from the background current, is generated in one rectangular busbar and its value is measured at the location of the calibrator, and transmitted wirelessly to the location of the TMR sensors. A new and robust method is proposed to extract the voltage components, corresponding to the calibration current, from the voltage waveforms of the TMR sensors. By calculating the proportional coefficients between the calibration currents and the extracted voltage components, online calibration of the current sensor is achieved. We designed and implemented a current measurement system consisting of a current sensor using TMR sensors, a thyristor-controlled resistive load for current sensor calibration, and a data acquisition circuit based on a multi-channel analog-to-digital converter (ADC). Current measurement experiments were performed in a practical distribution cabinet installed in our laboratory. Compared to the measurement results using a commercial current probe with an accuracy of 1%, the relative error of the measured currents in RMS is less than 2.5% and the phase error is less than 1°, while the nonlinearity error of the current sensor is better than 0.8%.

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Section: Introductionmentioning

confidence: 99%

Non-Contact Current Measurement for Three-Phase Rectangular Busbars Using TMR Sensors

Su,

Li,

Liang

et al. 2024

Sensors

Self Cite

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“…Methods for measuring the voltage of transmission lines and corresponding contactless voltage sensors have also been proposed [12,13]. In [14], a differential capacitive sensor for measuring single-phase enclosed two-wire residential entrance lines has been designed, and the sensor is calibrated by a multimeter to achieve accurate voltage measurement (so called Semi-Contactless). The same measurement principle appears in [15].…”

Section: Introductionmentioning

confidence: 99%

Noncontact Voltage Measurement System for Low-voltage Power Line

Su,

Li,

Liang

et al. 2024

PIER M

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As one of the most basic electric quantities in a power system, voltage plays an important role in many fields such as condition monitoring and fault diagnosis. The construction and development of the smart grid cannot be separated from the reform and progress of the advanced sensing and measurement technology. Noncontact voltage measurement technology, as one of the important technologies, has many advantages such as no electrical contact, low insulation requirements, easy installation, and great potential in improving the panoramic perception ability of the power system. In this paper, a noncontact measurement method of the power line voltage based on capacitive coupling principle is proposed, which realizes the reliable measurement of the line voltage waveform. First, the principle of the noncontact voltage measurement method is introduced, which mainly includes self-calibration and online measurement of the sensor. The high-frequency voltage signal is injected into the capacitive coupling network of the sensor to implement the self-calibration of the sensor. Then, the digital integration method is used to integrate the output signal of the sensor to measure the line voltage waveform. Second, the noncontact voltage sensor prototype and signal processing circuit are designed. Finally, the test platform of the line voltage measurement is built, and the measurement test of 220 V/50 Hz line voltage waveform is carried out. The test results show the relative amplitude error of the voltage measured by the sensor is less than 2.5%, the maximum phase error less than 2 • at 50 Hz, and the linearity better than 0.5%. The frequency response experiment shows that the system has almost constant gain in the frequency range of 50-1800 Hz, and the phase error reaches a maximum of 2.8 • at a frequency of 1800 Hz.

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“…This excellent characteristic has made non-contact voltage measurement technology a research hotspot in different fields in recent years. For example, acquisition of weak biological potential [1][2][3], non-invasive load monitoring [4,5], overvoltage measurement [6,7], motor status monitoring [8,9], partial discharge monitoring [10].…”

Section: Introductionmentioning

confidence: 99%

Non-contact voltage measurement of residential cables based on internal parameter conversion and centering probe assistance

Huang,

Zhang,

Suo

2023

Meas. Sci. Technol.

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Existing non-contact voltage measurement technology cannot be applied to residential cables containing neutral wire and earth wire in addition to live wire. A non-contact voltage measurement method of residential cables is introduced in this article. First, an equivalent circuit model of the residential cable measurement based on capacitive coupling is established. In order to solve the problem of uncertain coupling capacitance, which leading to the inability to accurately obtain the voltage amplitude, a calibration method based on internal parameter conversion and centering probe assistance is proposed. This method calibrates the cable voltage through different transfer relationships and sensor outputs, and no known reference excitation is required during calibration. Subsequently, the impact of internal parameters on measurement accuracy are analyzed and selection principles are provided. Through finite element simulation, the influence of metal spring for centering on voltage measurement is analyzed, and the measurement error of non-ideal cables (with eccentricity or ovality) is quantified. A prototype probe and internal parameter conversion circuit have been developed, and parasitic capacitance compensation have been completed. The measurement accuracy of 50-Hz voltage in a certain range (100V-300V) was tested in the laboratory, the maximum relative error of amplitude is –0.89%, and the relative error of phase is 0.68%. Four specifications of residential cables testing were completed, with a maximum relative error of –1.35%. Long- term testing was conducted on the actual field (output voltage of the distribution box), the test results showed that the output was linear, and the relative error were kept around 0.65% after primary calibration.

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Semi-Contactless Power Measurement Method for Single-Phase Enclosed Two-Wire Residential Entrance Lines

Cited by 9 publications

References 23 publications

Non-Contact Current Measurement for Three-Phase Rectangular Busbars Using TMR Sensors

Non-Contact Current Measurement for Three-Phase Rectangular Busbars Using TMR Sensors

Noncontact Voltage Measurement System for Low-voltage Power Line

Non-contact voltage measurement of residential cables based on internal parameter conversion and centering probe assistance

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