A Laboratory Study on the Ion-Flow Field Model of the DC Wires in Stable Wind

Abstract

Although transverse wind exerts an important influence on the distribution of the ion current density under HVDC transmission lines, very few experiments involving stable wind have been used to verify the numerical model. To overcome the variability of natural wind, a low-speed wind tunnel was used to produce stable wind in this research. An experimental platform was set-up in the wind tunnel, to measure the ion current density of DC wires. Based on the experiment, transverse wind exerted significant influence over the distribution of the ion current. The numerical model was discussed and the results showed reasonable agreement with the measured values for different wind speeds.

Fast Corona Discharge Assessment Using FDM integrated With Full Multigrid Method in HVDC Transmission Lines Considering Wind Impact

“…Generally, the FDM with the FMG solver predicts a significant rise in the value of the current density, and a closely persistent electric field on the ground plane when the wind speed increases and these results agreed qualitatively with the theoretical model of Takuma [9], and the previous experimental results [32][33][34].…”

Non-Contact Measurement and Analysis of Trapped Charge Decay Rates for Cable Line Switching Transients

“…It should also be remarked that in addition to RH, the strength of the wind also plays a role in the distribution of the electric field. This was shown in [18,19], which demonstrates the use of FMs to measure the electric field underneath a HVDC line. This adds a further complication to the process of relating observed FM voltage to actual voltage on the busbar.…”

Received signal strength indication‐based localisation method with unknown path‐loss exponent for HVDC electric field measurement

“…On the other hand, we can use the values of P Ai and P Bi to judge D i is located between whether anchors A and C, or anchors B and C. Since longer distance yields weaker received signal strength, the unknown node D i is located closer to anchor A than B when P Ai > P Bi , and vice versa. In summary, the parameter α can be obtained via (8) or (9), then x 1 and x 2 are calculated by (6) or (7). To balance the potential estimation errors of x 1 and x 2 , we use the mean value of them as the location of the unknown node D i , i.e.…”

“…With the large-scale implementations of HVDC transmission lines, the environmental impacts due to electromagnetic waves have become a focus of public attention in the following technical parameters: electric field [6][7][8], ion current density, space charge density [9], radio interference [10,11], audible noise [12,13], corona discharge [14][15][16][17] etc. In contrast to the HVAC transmission lines, the electric field under HVDC lines is greatly enhanced when a corona discharge occurs and an accurate and efficient measurement method is needed to assure the system follows the electromagnetic environmental standard.…”