Abstract
It is of great significance to accurately provide electric field information for electric power operators and electric power inspection equipment to ensure the safety of live working robots and electric power workers. In this paper, the principle of parallel plate charge induction is used to detect electric field signals and the influence of the inherent capacitance of the parallel plate on the back-end circuit is considered. An equipotential ring is used as the structure of the sensing unit to eliminate the uncertainty generated by the edge electric field. The parameters of the sensor probe are determined by the principle of differential-integration, and its structure is analyzed and designed. The consistency of the designed sensor probe was analyzed, and the results show that the consistency of the sensor is better. We have measured the sensitivity coefficients of the six probes, and the average absolute deviation reached 0.031556. The fits were all above 0.9995. In addition, a three-dimensional power frequency electric field measurement system that is easy to manufacture is designed using the hexahedral structure, which solves the problem of inaccurate electric field measurement caused by the parallel plate probe and the field source being not perpendicular, and the combined field strength formula of nonuniform electric field was obtained. In the laboratory environment, the three-dimensional power frequency electric field measurement system produced in this paper is compared with the electric field simulated by an electric field simulation tool. The test results show that the deviation between the measurement system and simulation is within ±0.55%, the measurement range is 1 kV/m–200 kV/m, the resolution is ≥1 V/m, and the maximum electric field can be measured at 200 kV/m. The nonlinear error is 2.15%, and the sensitivity coefficient is 19.10 mV / kV · m − 1 , which meets the measurement requirements of the power frequency electric field and can be applied to the actual power frequency electric field measurement.
Highlights
Electric field measurement is of great significance in many fields of scientific research and engineering technology, such as the measurement of the pulsed electric field of defense technology nuclear explosion, the real-time monitoring of lightning transient electric field in the aerospace field, the field detection of medical equipment in the power medical industry, and the field of communication near-field measurement of mid-antenna and biological effects of the bioelectric field [1,2,3,4,5]
Reference [14] proposed a new atmospheric electric field sensor based on a high-sensitivity resonant microelectromechanical system (MEMS) electric field sensor chip, which solves the problems of motor wear, high power consumption, and failure rate
We designed and optimized a three-dimensional power frequency electric field measurement system, which consists of a sensor probe, a differential integration circuit, an adjustment circuit, and a back-end processing system
Summary
Electric field measurement is of great significance in many fields of scientific research and engineering technology, such as the measurement of the pulsed electric field of defense technology nuclear explosion, the real-time monitoring of lightning transient electric field in the aerospace field, the field detection of medical equipment in the power medical industry, and the field of communication near-field measurement of mid-antenna and biological effects of the bioelectric field [1,2,3,4,5]. The sensor has a large volume and is difficult to carry These sensors cannot be applied to some newer application scenarios, like when electric power workers are performing live work, they need to accurately monitor the electric field information of their location, which is used to set threshold alarms to ensure personal safety. Another example is when drone inspection of the high-voltage transmission line is limited by the unmanned aerial vehicle (UAV) vision system, it is impossible to accurately judge the distance of the drone relative to the line. The field measurements are compared with Narda sensors, and the full results are summarized
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