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Research and Experiments on a Unipolar Capacitive Voltage Sensor.

Qiang Zhou¹, Wei He², Songnong Li³

¹State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China. 20131101031@cqu.edu.cn.

Sensors (Basel, Switzerland)

|August 27, 2015

Summary

This summary is machine-generated.

This study introduces a novel, miniaturized voltage sensor utilizing electric field coupling. The new design offers accurate, real-time voltage measurement for smart grids, improving power grid monitoring and preventing electricity theft.

Keywords:

Ansoft Maxwell differential input non-contact measurement voltage sensor

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Area of Science:

Electrical Engineering
Sensor Technology
Power Systems

Background:

Traditional voltage sensors require direct contact with high-voltage sources, leading to large sizes, complex insulation, and high costs.
Existing sensors often use iron cores, risking ferromagnetic resonance, and multilevel capacitor dividers limit real-time voltage change reflection.

Purpose of the Study:

To design and develop a new type of voltage sensor based on electric field coupling.
To overcome the limitations of traditional voltage sensors, including size, cost, insulation complexity, and response time.

Main Methods:

A unipolar structure design was implemented to simplify insulation and reduce costs associated with grounding electrodes.
A differential signal input structure was adopted for the detection circuit to minimize common-mode interference.
Sensor modeling, simulation, and calculations were used to optimize electrode design and sensor performance.

Main Results:

The optimized sensor design achieved miniaturization.
Enhanced voltage division ratio and reduced phase difference in measurements were realized.
Testing on a 10 kV single-phase line confirmed accurate and real-time voltage measurement capabilities.

Conclusions:

The developed electric field coupling voltage sensor meets the demands for accurate, real-time voltage measurement in smart grids.
The sensor provides a new method for electricity larceny prevention and online power grid monitoring.
This innovation supports the development requirements of the smart power grid.