Non-contact measurement of lightning and switching transient overvoltage based on capacitive coupling and pockels effects

Han, Rui; Sima, Wenxia; Zhang, Yu; Sun, Shangpeng; Liu, Tong; Chen, Shaoqing

doi:10.1016/j.epsr.2015.11.037

Cited by 26 publications

(5 citation statements)

References 10 publications

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“…The non-contact overvoltage sensor uses the stray capacitance C 1 between the overhead transmission line and the sensor board as a high-voltage arm capacitor [15][16][17][18][19][20]. A capacitor is connected as a low-voltage arm capacitor.…”

Section: Non-contact Overvoltage Sensormentioning

confidence: 99%

Non-Contact Measurement and Polarity Discrimination-Based Identification Method for Direct Lightning Strokes

Jiang

Chen

et al. 2019

Energies

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Direct lightning strokes account for a large proportion of line faults. Lightning faults can be classified into several kinds, and the corresponding protection methods differ. The type of these lightning faults should be identified to establish targeted measures against lightning and improve lightning protection design. In this study, a non-contact multi-physical parameter lightning monitoring system is proposed. The voltage of the insulator string and the lightning grounding current of the transmission tower are chosen as two physical parameters to show the characteristic quantities of different lightning stroke types. These physical parameters are captured using a non-contact overvoltage sensor installed at the cross arm of the tower and several parallel Rogowski coils installed at the tower ground supports. An equivalent electromagnetic transient model of a 110 kV transmission line is developed to identify features of the signals under different lightning strokes. Based on time-domain and wavelet transform modulus maxima (WTMM) analyses, the polarity of insulator voltage, the polarity of tower current, and the mutation polarity of tower current when insulators flashover are extracted as characteristic quantities of polarity discrimination. Six kinds of direct lightning strokes can be identified based on the polarity discrimination method considering the lightning stroke point and the lightning current polarity. The identification method is verified by simulation data and application to an actual example.

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Section: Non-contact Overvoltage Sensormentioning

confidence: 99%

Non-Contact Measurement and Polarity Discrimination-Based Identification Method for Direct Lightning Strokes

Jiang

Chen

et al. 2019

Energies

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“…Using electric field sensors for voltage measurement is another solution that has been the subject of research and further improvement [22][23][24][25][26][27][28][29][30][31][32][33]. In [25][26][27][28], the authors propose voltage calculation through inversion or integration of the measured electric field.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Transient Overvoltages by Capacitive Electric Field Sensors

Probst,

Beltle,

Tenbohlen

2024

Sensors

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The accurate measurement and the investigation of electromagnetic transients are becoming more important, especially with the increasing integration of renewable energy sources into the power grid. These sources introduce new transient phenomena due to the extensive use of power electronics. To achieve this, the measurement devices must have a broadband response capable of measuring fast transients. This paper presents a capacitive electric field sensor-based measurement system to measure transient overvoltages in high-voltage substations. The concept and design of the measurement system are first presented. Then, the design and concept are validated using tests performed in a high-voltage laboratory. Afterwards, two different calibration techniques are discussed: the simplified method (SM) and the coupling capacitance compensation (CCC) method. Finally, three recorded transients are evaluated using the calibration methods. The investigation revealed that the SM tends to overestimate the maximum overvoltage, highlighting the CCC method as a more suitable approach for calibrating transient overvoltage measurements. This measurement system has been validated using various measurements and can be an efficient and flexible solution for the long-term monitoring of transient overvoltages in high-voltage substations.

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“…The excellent characteristics of noncontact voltage measurement, which does not require electrical connection with the measured object, have made this technology a research hotspot in different fields in recent years. Examples include: the acquisition of weak biological potential [9,10], relay protection [11], online overvoltage monitoring [12,13], and partial discharge monitoring [14,15]. However, contactless voltage measurement has not yet been applied in power systems where known frequency responses are required, due to the uncertainty of sensor gain in field applications of contactless voltage sensors.…”

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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Non-contact measurement of lightning and switching transient overvoltage based on capacitive coupling and pockels effects

Cited by 26 publications

References 10 publications

Non-Contact Measurement and Polarity Discrimination-Based Identification Method for Direct Lightning Strokes

Non-Contact Measurement and Polarity Discrimination-Based Identification Method for Direct Lightning Strokes

Measurement of Transient Overvoltages by Capacitive Electric Field Sensors

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

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