Transmission line assessment

Abstract

a transmission line system consists of five sub-systems, based on their individual functions. They are insulation, current carrying, construction, lightning protection and accessories subsystems. Each of the subsystem consists of components. Hundreds of transmission towers are usually be found between two substations. . The condition of a transmission line is assessed based on these subsystems. Among others, only some component, namely critical components, contributes to the condition of a transmission line. A favourable transmission line assessment will include every aspect of transmission line, i.e. component condition and environment condition. Environment is crucial factor in transmission lines, a transmission lines may have severe weather condition on some of its towers and in the same time a benign environment on its others. Despite of this importance, in this paper we will discuss about the determination of a transmission line condition. To begin with, an FMECA approach should be conducted and the result will shows each subsystem's weighting factor's which by then we are able to determine the most critical components of it. To achieve this, a good data is very important. The rule used in the assessment is the condition of a transmission line which is determined by the lowest tower condition score.

Risk Analysis Using Failure Modes, Effects, and Criticality Analysis for Transmission Network Assets

“…The financial severity score (Sm) of eight components applies directly to the condition index of the component (%CI), as outlined in Table 5, because the maintenance budget should be set according to the condition of the component. However, the financial severity score (SEfinance) of the transmission line is calculated as expressed using Equation (6). In this equation, the percentage cost (%Cost) of the eight components includes spare parts and the maintenance cost from the total cost of the tower span.…”

“…Economic problems have forced electric utility providers to provide better quality electricity under lower operating and maintenance costs. Therefore, the effective and efficient use of transmission assets is of prime concern to gain maximum benefits, whereas maintenance costs should be reduced [1][2][3][4][5][6][7][8]. Currently, some high voltage (HV) transmission lines in Thailand are very old and deteriorated.…”

Predicting remaining life of lattice steel transmission tower based on condition assessment and corrosion hazard data

“…Each assessment method has a unique approach for collecting the results. Technical characteristic assessment is concerned with reporting the physical, mechanical, and qualities of a component that can be measured during scheduled patrolling activities using visual and assessment tools [9,10]. The main steps of condition assessment include recording any damage and determining the causes of distress, assessing the extent of distress, and estimating the residual strengths of structural components and the system [7 -9].…”