Design and performance evaluation of a miniature broadband AC electric field sensor under an uneven electric field

The majority of power equipment operates within non-uniform or intricate electrical fields. However, existing electric field sensors exhibit limited measurement accuracy when confronted with such non-uniform electric fields. There is an urgent demand to develop miniature broadband electric field sensors capable of effectively monitoring uneven electrical fields. Therefore, a miniature broadband electric field sensor with dimensions of $1.9 \mathrm{~cm} \times 2.3 \mathrm{~cm}$ has been designed to suit the non-uniform electric field measurement. The electric field sensor has a frequency range of 10 Hz to 100 kHz, exhibiting a linearity of 0.99998. It offers a minimum resolution of 165 $\mathrm{V} / \mathrm{m} / \mathrm{Hz}^{1 / 2}$ and can measure electric fields ranging from $320 \mathrm{~V} / \mathrm{m}$ to over $10 \mathrm{kV} / \mathrm{cm}$. When subjected to the electric field generated by the blade electrode, the measurement error for the electric field is less than 5%.