Simulations and experiments of the generation apparatus of the DC electric field with the space charge

Abstract

To make accurate measurements, field mills must be calibrated in a known DC electric field space charge in which the quantities can be control1ed. A simulation model of the generation apparatus of the electric field with a space charge has been built. Based on the combination of the electric field and the transfer of a dilute substances model, the influence of openings in the metal screen was calculated. Simulation results showed that the opening size of the high-voltage electrode has a great influence on the distribution of the electric field and ion density at the calibration zone. Next, a generation apparatus was designed and developed and ion mobility was researched. The experimental results showed that ion mobility decreased with an increase in electric field strength. However, ion mobility tends to be saturated when the electric field reaches a certain critical value. Two fitting formulas of ion mobility of positive and negative charge are proposed that can be used to predicate ion mobility in a high electric field.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

Analysis of the influence of the grounding method on the measurement of direct current total electric field on a civil housing platform

“…For other types of wires, the charge density in the air is between 10 −6 C/m 3 and 10 −9 C/m 3 according to the calculated ion flow field. The mobility of positive and negative ions is generally 1.4 to 3.8 × 10 −4 m 2 /(V⋅s) [30], so the 'equivalent conductivity' in the air is generally of the order of 10 −13 to 10 −10 . On the other hand, according to the actual measurements of the ground electric field strength, the amplitude of the space charge-modified electric field is generally 5 to 20 kV/m, and the ion current density is generally 10 to 50 nA/m 2 [31].…”

“…In view of the measurement error caused by ion current, Zhang et al used a DC electric field measurement device [17], adopted the differential input method to reduce the interference of the ion signal of the field mill, and improved the measurement accuracy [18]. Wang et al discussed whether the cover plate can be removed [19], and found that the electric field distortion coefficient was a fixed value when the cover plate was added or not, and the measurement results were similar after calibration. Zhao et al conducted three-dimensional finite element simulation and actual measurement, discussed the differences between the three methods of the measuring conditions and proposed corresponding calibration methods for each method [20].…”

“…In view of the measurement error caused by ion current, Zhang et al. used a DC electric field measurement device [17], adopted the differential input method to reduce the interference of the ion signal of the field mill, and improved the measurement accuracy [18]. Wang et al.…”

Optimising the electroluminescence performance of ZnS: Cu/epoxy composites via exploring the relationship between electroluminescence intensity and filler intrinsic attributes

“…In order to ensure the safety of experiments, the breakdown electric field strength of composites under the AC electric field is tested first. Weibull distribution [40,41] is used to process the breakdown electric field strength data and shown in equation (2).…”

“…With the rapid development of the smart grid, advanced electric field measurement technology is increasingly required, which is one of the most significant segments to ensure the normal operation of power equipment [1,2]. The amplitude and frequency composition of an electric field becomes more complex accompanied by the introduction of a large number of power electronic devices [3].…”