Research on the correlation between corona current spectrum and audible noise spectrum of HVDC transmission line

Abstract

Audible noise is closely related to corona current on a high voltage direct current (HVDC) transmission line. In this paper, we measured a large amount of audible noise and corona current waveforms simultaneously based on the largest outdoor HVDC corona cage all over the world. By analyzing the experimental data, the related statistical regularities between a corona current spectrum and an audible noise spectrum were obtained. Furthermore, the generation mechanism of audible noise was analyzed theoretically, and the related mathematical expression between the audible noise spectrum and the corona current spectrum, which is suitable for all of these measuring points in the space, has been established based on the electro-acoustic conversion theory. Finally, combined with the obtained mathematical relation, the internal reasons for these statistical regularities appearing in measured corona current and audible noise data were explained. The results of this paper not only present the statistical association regularities between the corona current spectrum and the audible noise spectrum on a HVDC transmission line, but also reveal the inherent reasons of these associated rules.

Analysis of the relationship between DC component and spectral components of corona current on HVDC transmission lines

“…The method of wavelet noise reduction was used to reduce random signals. The detailed specific noise reduction process can be found in [26, 30, 32].…”

“…Meanwhile, it has been found that it is hard to discover the laws with the general spectrum of corona current because the amplitude at a single‐frequency point fluctuates obviously. While, 1/3 OPS, which expresses the total power in different frequency bands, can overcome the above shortcomings [26, 30]. Therefore, the 1/3 OPS of corona current can also avoid errors brought up by single‐frequency point.…”

“…The 1/3 OPS of corona current can be obtained by (1) [26, 30]: where f is the centre frequency of a certain octave band. and are the 1/3 OPS and the effective value of corona current in the frequency band centred at f , in dB and mA, respectively [26, 30].…”

Ultrawideband Discharge Source DOA Estimation Method Using Multiple Baseline Wideband Time-Domain Interferometry with Hilbert Transform

“…Gas discharge is a common phenomenon existing in nature and industrial fields and can bring inevitable interruption as well as serious damage to electronic equipment [1,2]. However, the emission from gas discharge, especially the RF electromagnetic pulses (EMPs), has an extensive use in many applications, such as plasma density measurement, partial discharge detection, and lightning locating [3,4].…”

Research on the correlation between the frequency‐domain characteristics of corona current and A‐weighted sound level of audible noise for UHV DC transmission line

“…In the literature [22], audible noise and corona current signals in corona cage were measured at the same time, and found out that the audible noise signals and corona current signals appeared together when corona discharges and this phenomenon can be used to measurement corona onset voltage. The literature [23,24] investigated the mechanism of audible noise caused by corona based on the motion of electron. The literature [25] analysed the correlation between audible noise and DC corona current quantitatively based on the experiments, and obtained many meaningful research results.…”