The Evaluation Method of Surface Roughness Degree for Long-Term Operating Conductors Based on Gray Value Matrix

Abstract

In order to obtain the average surface roughness of the long-term operating conductors in service, the features of 2-D surface morphologies were investigated based on the gray value matrix . The neighborhood averaging method was utilized in obtaining . In a wide range of , a linear relationship was discovered between the variance and . Therefore, could be obtained based on the images from the camera and without the need to dismantle the conductors in service, and it is more time saving and economical for the measurements.Index Terms-Gray value matrix, long-term operating conductors, neighborhood averaging method, surface roughness.

Yardstick competition-based comprehensive assessment approach of power system security with intermittent generation integration

“…Gray correlation analysis is suitable for the gray system with information not fully explicit, and it has a high accuracy in processing and assessing issues with irregular indicators . The grid security assessment with IGS integration has many interconnected indicators, which displays different degrees of gray level, so applying gray correlation analysis method to the comprehensive security assessment of IGS integration to grid turns out to be a rational option.…”

“…Gray correlation analysis is suitable for the gray system with information not fully explicit, and it has a high accuracy in processing and assessing issues with irregular indicators. 22 The grid security assessment with IGS integration has many interconnected indicators, which displays different degrees of gray level, so applying gray correlation analysis method to the comprehensive security assessment of IGS integration to grid turns out to be a rational option. The basic approach of gray relational analysis method lies in establishing a gray correlation model to determine the correlation between sequences through calculating the correlated region between reference sequence curve and comparison sequence curve.…”

Experimental studies on effects of surface morphologies on corona characteristics of conductors subjected to positive DC voltages

“…Although there were some studies for surface characterisation of conductors due to natural and artificial contamination along with their effects on corona discharges [38][39][40][41][42][43][44] and some analysis of particle behaviours in electric field, very little attention was paid to impacts on the accumulation of fine particulate matters on the surface of high-voltage conductors in air and their influence on the corona characteristics. Therefore, the objective of the present study was to investigate the role of fine particulate matters on the surface conditions of conductors and their influence on the corona characteristics when subjected to positive-polarity direct-current (DC) voltage experimentally.…”

Do Ecosystem Service Value Increase and Environmental Quality Improve due to Large–Scale Ecological Water Conveyance in an Arid Region of China?

“…Research related to ecological protection and estimation of gross ecosystem product (GEP) has been developing rapidly [17][18][19]. At present, many methods exist for assessing ecosystem service values and environmental quality [20][21][22], and the results all have been digitized. They have strong operability and applicability and have been applied widely [23][24][25].…”