Electric Field Measurement Techniques in Power Systems

Electric field measurement in power systems underpins critical activities from asset monitoring to safety assurance. Techniques span optical, inductive and microfabricated approaches, each offering distinct advantages in sensitivity, bandwidth and spatial resolution. Optical methods frequently exploit interferometric principles, enabling non‐invasive detection of intense or transient fields with high linearity and frequency response. Inductive sensors capture field‐induced currents via precision coils or spherical electrodes, facilitating broadband coverage including power‐frequency and lightning‐impulse waveforms. Micro-electro-mechanical systems (MEMS) devices, meanwhile, afford miniaturisation and multi-axis measurement, reducing cross-axis interference and lowering power consumption. Recent advances integrate three-dimensional measurement schemes, enhanced shielding structures and digital signal processing, yielding sub-percent measurement uncertainty across kilovolt-per-metre ranges. Collectively, these developments have broadened the scope of field sensing in substations, overhead lines and distributed grid installations, reinforcing grid resilience and operational insight.

Research from Nature Portfolio

Recent studies have demonstrated the use of liquid crystal droplets as high-resolution probes for visualising micro-scale electric fields. By embedding droplets within microstructured electrode arrays, researchers achieved spatial resolution down to 10 µm and field detection accuracy of 5 µV/µm. Rotational and translational motion of the droplets under applied voltage was matched to numerical models, yielding detailed maps of electrostatic energy distribution. An array of periodically modulated droplets further served as a refractive-index sensor grid, illustrating the potential for simultaneous field mapping and optical modulation in compact device architectures. These findings open pathways to direct visualisation of complex field patterns in power-electronic components and on-chip high-voltage interfaces.

Electric Field Measurement Techniques in Power Systems publication trend

The graph below shows the total number of articles in electric field measurement techniques in power systems across all publications each year (not limited to Nature Index journals).

Technical terms

Electric field sensor (EFS): A device that detects the magnitude and direction of an electric field, often by measuring induced charge or optical phase shift.

Mach–Zehnder interferometer: An optical configuration splitting and recombining light paths to detect phase changes proportional to external electric fields.

Micro-electro-mechanical systems (MEMS): Miniaturised mechanical and electrostatic structures fabricated on semiconductor substrates for sensitive field detection.

Cross-axis coupling interference: Undesired influence of orthogonal field components on the output of a multi-axis sensor.

Torsional resonance: Oscillatory motion about an axis used in microsensors to enhance charge induction and signal sensitivity.

References

1. Development of a Wideband Precision Electric Field Measuring Sensor. Sensors (2023).
2. Rotation and transportation of liquid crystal droplets for visualizing electric properties of microstructured electrodes. Scientific Reports (2023).
3. Design, Fabrication and Characterization of a MEMS-Based Three-Dimensional Electric Field Sensor with Low Cross-Axis Coupling Interference. Sensors (2018).
4. A Power-Frequency Electric Field Sensor for Portable Measurement. Sensors (2018).