A Non-Contact Voltage Measurement System for Power-Line Voltage Waveforms

HABERMAN, MARCELO A.; SPINELLI, ENRIQUE M.

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Año: 2020 vol. 69 p. 2790 - 2797

0018-9456

This work presents the design and implementation details of a complete non-contact (NC) voltage acquisition system, which allows the measurement of power-line voltage waveforms without galvanic contact. The system is composed by a novel capacitive probe, an analog front-end, and a microcontroller-based digital signal processing stage. A deep experimental characterization of the non-contact measurement system was performed. The tests reported a high linearity (maximum non-linearity of ±0.2%), a low input-referred noise (11 mVRMS), and a low frequency response distortion. Measurements of ±330 V triangular waveform signals were performed with maximum instantaneous errors below ±1.5V. The power-line voltage (220 VRMS @ 50 Hz) was acquired without galvanic contact with an instantaneous error lower than ±3 V, whereas the mean error on RMS voltage measurements was 0.32% and the maximum 0.7%. A two-days continuous measurement of power line voltage was accomplished for testing system?s stability, resulting in negligible accuracy variations.