Optical voltage sensor based on a piezoelectric thin film for grid applications

Edmunds, Jordan L.; Sonmezoglu, Soner; Martens, J.W.D.; Meier, Alexandra von; Maharbiz, Michel M.

doi:10.1364/oe.437915

Cited by 10 publications

(3 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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“…The non-contact voltage sensor based on the principle of electric field coupling facilitates convenient measurements and has the advantages of a simple structure, a wide linear range of measurement, a stable transient response, and a fast response speed. It has facilitated a new method of voltage measurement to meet the measurement requirements of the current power system [18][19][20][21][22]. Non-contact voltage measurement has been widely studied and applied in power measurement, the online monitoring of overvoltage, partial discharge monitoring, and equipment automation [23,24].…”

Section: Introductionmentioning

confidence: 99%

Non-Contact Adaptive Voltage Sensor Based on Electric Field Coupling Principle

Tan,

Zhang,

et al. 2023

Sensors

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Non-contact voltage sensors based on the principle of electric field coupling have the advantages of simple loading and unloading, high construction safety, and the fact that they are not affected by line insulation. They can accurately measure line voltage without the need to connect to the measured object. Starting from the principle of non-contact voltage measurement, this article abstracts a non-contact voltage measurement model into the principle of capacitive voltage sharing and deduces its transfer relationship. Secondly, it is theoretically inferred that the edge effect of the traditional symmetric structure sensor plate will cause the actual capacitance value between the sensor plates to be greater than the theoretically calculated capacitance value, resulting in a certain measurement error. Therefore, the addition of an equipotential ring structure is proposed to eliminate the edge additional capacitance caused by the edge effect in order to design the sensor structure. In addition, due to the influence of sensor volume, material dielectric constant, and other factors, the capacitance value of the sensor itself is only at pF level, resulting in poor low-frequency performance and imbuing the sensor with a low voltage division ratio. In this regard, this article analyzes the measurement principle of non-contact voltage sensors. By paralleling ceramic capacitors between the two electrode plates of the sensor, the capacitance of the sensor itself is effectively increased, improving the low-frequency performance of the sensor while also increasing the sensor’s voltage division ratio. In addition, by introducing a single pole double throw switch to switch parallel capacitors with different capacitance values, the sensor can have different voltage division ratios in different measurement scenarios, giving it a certain degree of adaptability. The final sensor prototype was made, and a high and low voltage experimental platform was built to test the sensor performance. The experimental results showed that the sensor has good linearity and high measurement accuracy, with a ratio error of within ±3%.

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“…This method has good measurement accuracy, but it is difficult to achieve large-scale promotion of engineering applications because of the complex structure of optical devices, high cost, complex daily maintenance and repair, and the fact that it is easily affected by ambient light. Non-contact voltage measurement based on electric field coupling is more convenient for industrial application [ 12 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Its basic principle is that, by applying a certain voltage or electric field, electromotive force will be generated on the induction electrode, and a resistance or capacitance connection can be formed between the electrodes.…”

Section: Introductionmentioning

confidence: 99%

Research on a Non-Contact Multi-Electrode Voltage Sensor and Signal Processing Algorithm

Zhang

Yang

Zhao

et al. 2022

Sensors

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Traditional contact voltage measurement requires a direct electrical connection to the system, which is not easy to install and maintain. The voltage measurement based on the electric field coupling plate capacitance structure does not need to be in contact with the measured object or the ground, which can avoid the above problems. However, most of the existing flat-plate structure voltage measurement sensors are not only expensive to manufacture, but also bulky, and when the relative position between the wire under test and the sensor changes, it will bring great measurement errors, making it difficult to meet actual needs. Aiming to address the above problems, this paper proposes a multi-electrode array structure non-contact voltage sensor and signal processing algorithm. The sensor is manufactured by the PCB process, which effectively reduces the manufacturing cost and process difficulty. The experimental and simulation results show that, when the relative position of the wire and the sensor is offset by 10 mm in the 45° direction, the relative error of the traditional single-electrode voltage sensor is 17.62%, while the relative error of the multi-electrode voltage sensor designed in this paper is only 0.38%. In addition, the ratio error of the sensor under the condition of power frequency of 50 Hz is less than ±1% and the phase difference is less than 4°. The experimental results show that the sensor has good accuracy and linearity.

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Optical voltage sensor based on a piezoelectric thin film for grid applications

Cited by 10 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

Non-Contact Adaptive Voltage Sensor Based on Electric Field Coupling Principle

Research on a Non-Contact Multi-Electrode Voltage Sensor and Signal Processing Algorithm

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