Non-Contact Adaptive Voltage Sensor Based on Electric Field Coupling Principle
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 measure...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-10-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/23/19/8316 |
| _version_ | 1797575148936626176 |
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| author | Xiangyu Tan Wenbin Zhang Mingxing He Wenyun Li Gang Ao Fangrong Zhou |
| author_facet | Xiangyu Tan Wenbin Zhang Mingxing He Wenyun Li Gang Ao Fangrong Zhou |
| author_sort | Xiangyu Tan |
| collection | DOAJ |
| description | 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%. |
| first_indexed | 2024-03-10T21:34:35Z |
| format | Article |
| id | doaj.art-560b4bc0de254756a30c233b1a980c73 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T21:34:35Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-560b4bc0de254756a30c233b1a980c732023-11-19T15:05:52ZengMDPI AGSensors1424-82202023-10-012319831610.3390/s23198316Non-Contact Adaptive Voltage Sensor Based on Electric Field Coupling PrincipleXiangyu Tan0Wenbin Zhang1Mingxing He2Wenyun Li3Gang Ao4Fangrong Zhou5Electric Power Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650217, ChinaCollege of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650504, ChinaCollege of Science, Kunming University of Science and Technology, Kunming 650504, ChinaChina Southern Power Grid, Yunnan Power Grid Co., Ltd., Kunming 650011, ChinaYunnan Power Grid Co., Ltd., Kunming Power Supply Bureau, Kunming 650001, ChinaElectric Power Research Institute, Yunnan Power Grid Co., Ltd., Kunming 650217, ChinaNon-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%.https://www.mdpi.com/1424-8220/23/19/8316electric field couplingnon-contact voltage measurementvariable voltage division ratioself-adaption |
| spellingShingle | Xiangyu Tan Wenbin Zhang Mingxing He Wenyun Li Gang Ao Fangrong Zhou Non-Contact Adaptive Voltage Sensor Based on Electric Field Coupling Principle Sensors electric field coupling non-contact voltage measurement variable voltage division ratio self-adaption |
| title | Non-Contact Adaptive Voltage Sensor Based on Electric Field Coupling Principle |
| title_full | Non-Contact Adaptive Voltage Sensor Based on Electric Field Coupling Principle |
| title_fullStr | Non-Contact Adaptive Voltage Sensor Based on Electric Field Coupling Principle |
| title_full_unstemmed | Non-Contact Adaptive Voltage Sensor Based on Electric Field Coupling Principle |
| title_short | Non-Contact Adaptive Voltage Sensor Based on Electric Field Coupling Principle |
| title_sort | non contact adaptive voltage sensor based on electric field coupling principle |
| topic | electric field coupling non-contact voltage measurement variable voltage division ratio self-adaption |
| url | https://www.mdpi.com/1424-8220/23/19/8316 |
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