Abstract
The associated daily maintenance effort and cost has been increasing with the growing use of high-voltage (HV) cable circuits. This study proposes a time-delay concept-based approach to maintenance scheduling of individual HV cable components, to allow periodicity of inspection to be optimised with consideration of time-delay interval between the instant of defect inception and final failure. Here, the progress from a defect to its resultant final failure can be represented as a two-stage process, one being a stochastic process of defect arrival and the other being a delay-time interval from defect to failure. Then an optimisation model is established to schedule maintenance activities based on the two statistical processes, where the objective function is set as the minimal maintenance cost. Cable circuits are divided into five components in accordance with the objects of inspection and testing. The components within different service ages are considered individually in the statistical models, and their accumulate failure numbers during each service year are used to automatically formulate and update periodicity of inspection. To illustrate the feasibility of the approach proposed, theoretical analysis on thousands of cable circuits are carried out. Results show that the economic expenditure could be reduced by 22.2% after optimisation.
Highlights
With the growing use of high-voltage (HV) cable circuits in urban power networks, potential cable failures are great threats to the operation of the power grid and may result in serious economic losses [1,2,3]
Further technological advancement will be required for conditionbased maintenance to be effectively applied in practice, preferably with considerations of the following: (i) deviations between the results of assessment based on subjective expert knowledge and criteria and actual facts [13]; (ii) the causes contributed to cable failures vary due to manufacturing supplier, local climate conditions, installation methods etc., (iii) readily available failure and daily maintenance data have not been made use of to prevent similar future failures
The present paper develops a time-delay concept-based approach to maintenance scheduling of individual HV cable components
Summary
With the growing use of high-voltage (HV) cable circuits in urban power networks, potential cable failures are great threats to the operation of the power grid and may result in serious economic losses [1,2,3]. Preventive maintenance activities have been taken on a regular basis, such as inspection, online or offline testing, to ensure acceptable reliability of these essential assets [4,5,6] By taking these pre-emptive actions, many defects and anomalies of cables can be located and eliminated prior to failure. According to the statistics of historical cable failure events, it takes time for a failure to develop from the instant when a defect exists, and the instant of the eventual failure, or when the cable asset becomes unable to provide normal service This time interval gives an opportunity for the defect to be identified and eliminated prior to failure through daily inspection and testing.
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