A Model of Electromagnetic Interferences Induced by Corona Discharges for Wireless Channels in Substation Environments

Abstract

The design of robust receivers in environments with strong impulsive noise may be challenging due to their highamplitude events and their rare but nonnegligible occurrence. In substation environments, these impulsive noises are predominant. They are induced by corona discharges such as electrical arcs or partial discharges in the air. The emitted radiations can occupy a wide range of frequencies typically reaching a few gigahertz with very high amplitude. In this paper, we develop a generalized model of impulsive electromagnetic interference induced by corona discharges for wireless channels. Radiations emitted by these sources are generally transient impulses, their occurrences follow cyclostationary process, due to their generation by an alternative current. In this model, we both take into account the physical mechanism of these discharges and the induced electromagnetic radiations. Experimental results validate the approach in terms of first-and second-order statistics such as amplitudes, interarrival time, occurrences, and power spectrum densities of impulsive transient noise.

Analysis and Experimental Validation of Efficient Coded OFDM for an Impulsive Noise Environment

“…It consists of tests in the laboratory that are done using a Tesla coil or generator bar. In [ 34 , 35 ], the authors designed a setup for tests in the laboratory, and the results showed that it is possible to use these devices to generate partial discharges or gap noises.…”

Fast identification of partial discharge sources using blind source separation and kurtosis

“…Hence, in the presence of multiple PD sources, it is reasonable to consider that sources are independent or at least decorrelated. Moreover, according to the physical characteristic of radiated radio frequency signals from PD activity measured in [1, 2], one can assume that PDs are non‐Gaussian. In measurement campaigns in substations, these impulsive signals have transient behaviour with damped oscillation.…”

“…Their electromagnetic radiations can be detected by wireless devices for remote monitoring applications. The resulting signal is highly impulsive where the spectrum can cover very large frequency bands (above a few gigahertz) [1, 2].…”

“…The average number of emissions per unit time per sources is given by λ e . From [2,4], transient impulsive signals from discharge activity are simulated by using AR models such that a single discrete-time impulse u t is written as…”

Developing a Filtering Algorithm for Partial Discharge Location Approximation Using the Emitted Electromagnetic Signals of Corona Discharges

“…Their presence can be the sign of a forthcoming fault in various high-voltage equipment or it can indicate an unwanted level of electrostatic charge accumulation on electrodes with a small radius of curvature. The emitted electromagnetic disturbances of PDs can cause interferences in wireless communication [4], [5], but they also provide a promising opportunity to locate the discharge source and fix the underlying problem [6].…”