A study on maintenance decision support for power grid components using their inspection and maintenance records

Hironobu Shimasaki,Hirotaka Takano,Shiomi Ryuhei,Hisao Taoka

doi:10.1080/22348972.2019.1612976

Abstract

ABSTRACTElectric power companies are storing massive records such as results of inspection and maintenance through their daily operations. Although the massive records have been expecting to utiliz...

Highlights

Owing to the rapid growth in technologies of measurement, monitoring and communication, quantities of information, which have been gathered by several measurement systems, are increasing dramatically in various fields
The sets of inspection scores have been stored in databases as the inspection record, and utilized during the decision-making process whether the electrical components require to be taken measures or not to keep their functions appropriately
Since quantities of the inspection and the maintenance records are large, it has been extremely difficult to apply them for the power grid operations and planning effectively relying on knowledge and experience of the operators only

Summary

Introduction

Owing to the rapid growth in technologies of measurement, monitoring and communication, quantities of information, which have been gathered by several measurement systems, are increasing dramatically in various fields. The judgement results (measures for the inspection), such as Need follow-up observation or Need repair or replacement, described and stored as the maintenance record. These records are referred in expansion planning of the power grid equipment and expected to apply for improving operational efficiency and saving operators’ labour. Its constructing process can be classified into the following two steps: one is the tree growth and another is the branch pruning In the former, a creating tree model involves selected input data and split points on each score (growth) until satisfying the convergence criteria. The latter integrates verbose paths (pruning) until the Gini coefficient becomes sufficiently small

Overview of proposed decision support method

Decision tree-based method

Targeted inspection and maintenance records

Outline of numerical simulations

Results of electric pole

Evaluation data

Results of pole transformer

Result of switchgear

Conclusions

Notes on contributors