Study and Experiment on Non-Contact Voltage Sensor Suitable for Three-Phase Transmission Line

Sensors

Qiang Zhou²  Wei He²  Dongping Xiao²  Songnong Li¹  Kongjun Zhou¹ 

[1]State Grid Chongqing Electric Power CO. Electric Power Research Institute, Chongqing 400015, China

[2]State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China

关键词: voltage sensor;    non-contact measurement;    ansoft maxwell;    electric field intensity;    three phase transmission lines;   

DOI  :  10.3390/s16010040

来源: mdpi

【 摘 要 】

A voltage transformer, as voltage signal detection equipment, plays an important role in a power system. Presently, more and more electric power systems are adopting potential transformer and capacitance voltage transformers. Transformers are often large in volume and heavyweight, their insulation design is difficult, and an iron core or multi-grade capacitance voltage division structure is generally adopted. As a result, the detection accuracy of transformer is reduced, a huge phase difference exists between detection signal and voltage signal to be measured, and the detection signal cannot accurately and timely reflect the change of conductor voltage signal to be measured. By aiming at the current problems of electric transformation, based on electrostatic induction principle, this paper designed a non-contact voltage sensor and gained detection signal of the sensor through electrostatic coupling for the electric field generated by electric charges of the conductor to be measured. The insulation structure design of the sensor is simple and its volume is small; phase difference of sensor measurement is effectively reduced through optimization design of the electrode; and voltage division ratio and measurement accuracy are increased. The voltage sensor was tested on the experimental platform of simulating three-phase transmission line. According to the result, the designed non-contact voltage sensor can realize accurate and real-time measurement for the conductor voltage. It can be applied to online monitoring for the voltage of three-phase transmission line or three-phase distribution network line, which is in accordance with the development direction of the smart grid.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.