Non-intrusive DC voltage measurement based on resonant electric field microsensors

Yang, Pengfei; Xu, Wen; Chu, Zhaozhi; Ni, Xiaoming; Peng, Chunrong

doi:10.1088/1361-6439/abf631

Cited by 18 publications

(7 citation statements)

References 36 publications

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“…Capacitive voltage transformers are mainly used in power grids above 330 kV, which are large, expensive, and not easy to install and cannot meet the requirements of low-cost distributed devices [6]. The non-intrusive voltage measurement method realized by the electric field coupling principle has a series of advantages such as low insulation difficulty, simple structure, wide dynamic range, and fast transient response, which caters to the future need for intelligent voltage sensors in power systems and becomes a new direction for voltage measurement technology [7][8][9][10][11][12][13][14]. For transmission lines, non-invasive voltage measurement schemes based on the principle of capacitive coupling are less available, and the accuracy of the measurement cannot be guaranteed due to the change in the coupling capacitance value between the sensor system and the conductor to be measured due to different measurement environments [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Research on Non-Invasive Floating Ground Voltage Measurement and Calibration Method

Suo

Zhou

et al. 2023

Electronics

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Voltage measurement is an important part of power system operation, and non-intrusive voltage sensors have the advantages of low insulation difficulty, simple structure, easy loading and unloading, and high construction safety, which have become a new direction for voltage measurement. Based on the principle of electric field coupling, this paper constructs a non-intrusive floating ground three-capacitance voltage measurement model, which can complete the accurate measurement of voltage without connecting with the line to be measured and the earth in the measurement process. In non-intrusive voltage measurement, the change of the object to be measured or the measurement environment will cause the change of the coupling capacitance, which leads to the uncertainty of the transmission relationship of the sensor and the large error of measurement results. In order to solve this problem, a new method of sensor calibration is proposed in this paper. By sampling capacitance in parallel between two electrodes of the sensor, changing the capacitance value, and establishing an input output equation, the coupling capacitance value and the voltage value to be measured under different operating conditions are solved. In addition, the sampling capacitance is often several orders of magnitude larger than the sensor’s own capacitance, making the sensor’s voltage division ratio significantly higher and more conducive to the measurement of high voltages. The experimental results show that the measurement error is less than 2%, which verifies the feasibility of the method and the accuracy of the voltage measurement.

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Section: Introductionmentioning

confidence: 99%

Research on Non-Invasive Floating Ground Voltage Measurement and Calibration Method

Suo

Zhou

et al. 2023

Electronics

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“…However, this method requires that the high-voltage line be directly connected to the parametric capacitor. The author of [17,18] use a predesigned parasitic capacitance value to perform a series of calculations on the original voltage data obtained by coupling, and finally obtains the voltage value of the line to be tested. In this design, there is a problem that the calculated parasitic capacitance value is not equal to the actual parasitic capacitance value.…”

Section: Introductionmentioning

confidence: 99%

Self-Calibration Sensor for Contactless Voltage Measurement Based on Dynamic Capacitance

Suo

Huang

Zhou

et al. 2023

Sensors

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Noncontact voltage measurement has the advantages of simple handling, high construction safety, and not being affected by line insulation. However, in practical measurement of noncontact voltage, sensor gain is affected by wire diameter, wire insulation material, and relative position deviation. At the same time, it is also subject to interference from interphase or peripheral coupling electric fields. This paper proposes a noncontact voltage measurement self-calibration method based on dynamic capacitance, which realizes self-calibration of sensor gain through unknown line voltage to be measured. Firstly, the basic principle of the self-calibration method for noncontact voltage measurement based on dynamic capacitance is introduced. Subsequently, the sensor model and parameters were optimized through error analysis and simulation research. Based on this, a sensor prototype and remote dynamic capacitance control unit that can shield against interference are developed. Finally, the accuracy test, anti-interference ability test, and line adaptability test of the sensor prototype were conducted. The accuracy test showed that the maximum relative error of voltage amplitude was 0.89%, and the phase relative error was 1.57%. The anti-interference ability test showed that the error offset was 0.25% when there were interference sources. The line adaptability test shows that the maximum relative error in testing different types of lines is 1.01%.

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“…However, it still needs to be calibrated using known reference excitation. A noninvasive DC voltage measurement scheme based on coplanar electrode resonant electric field microsensor is proposed [19]. The induced probe is designed for a specific size of the wire, and the coupling capacitance between the wire and the probe is calculated to determine the sensor gain.…”

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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Non-intrusive DC voltage measurement based on resonant electric field microsensors

Cited by 18 publications

References 36 publications

Research on Non-Invasive Floating Ground Voltage Measurement and Calibration Method

Research on Non-Invasive Floating Ground Voltage Measurement and Calibration Method

Self-Calibration Sensor for Contactless Voltage Measurement Based on Dynamic Capacitance

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

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