Condition Assessment of Underground Cable System Using Health Index and Conditional Multiplying Factor

2019 ◽  
pp. 763-776
Author(s):  
Tanachai Somsak ◽  
Thanapong Suwanasri ◽  
Cattareeya Suwanasri
Keyword(s):  
Condition Assessment ◽  
Health Index ◽  
Cable System ◽  
Underground Cable

scholarly journals Lifetime Estimation Based Health Index and Conditional Factor for Underground Cable System

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 8113
Author(s):  
Tanachai Somsak ◽  
Thanapong Suwanasri ◽  
Cattareeya Suwanasri
Keyword(s):  
Estimation Method ◽  
Operating Conditions ◽  
Actual Condition ◽  
Health Index ◽  
Lifetime Estimation ◽  
Scoring Method ◽  
Cable System ◽  
Technical Data ◽  
Underground Cable ◽  
Cable Systems

In this paper, a lifetime estimation method for underground cable systems is proposed by combining a health index (HI) and conditional factor (CF). The underground cable system consists of underground cable, joint, termination, manhole, and duct bank. The HI is an indicator to indicate the actual condition of underground cable components and systems whereas the CF is used to indicate different operating stresses of the system under different operating conditions such as percentage loading, electrical stresses, laying structure, environment, etc. The actual technical data as well as historical operating and testing records are applied. The weighting and scoring method with the analytical hierarchy process are used to classify an importance of underground cable components, testing methods, and criteria used in the HI and CF calculation. The annual calculated HIs are plotted to investigate the lifetime trending curve by using a polynomial function. The degradation curve based on calculated CF is estimated by using the Weibull distribution function. Finally, the remaining life of the underground cable system is determined by matching the lifetime trending curve with the degradation curve. Ten practical underground cable systems supplying power in a high voltage power delivery system are evaluated with effective results. The lifetime of the underground cable system can be successfully estimated.

Health Index for Transformer Condition Assessment

2018 ◽  
Vol 16 (12) ◽  
pp. 2843-2849 ◽  
Author(s):  
Ricardo Manuel Arias Velasquez ◽  
Jennifer Vanessa Mejia Lara
Keyword(s):  
Condition Assessment ◽  
Health Index

scholarly journals Power transformer health index estimation using evidential reasoning

2020 ◽  
Vol 33 (4) ◽  
pp. 571-581
Author(s):  
Srdjan Milosavljevic ◽  
Aleksandar Janjic
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Power Transformer ◽  
Real Data ◽  
Condition Assessment ◽  
Evidential Reasoning ◽  
Health Index ◽  
Power Distribution System ◽  
Index Value ◽  
Shafer Theory

Market-oriented power distribution system requires a well-planned budget with scheduled preventive and corrective maintenance during a replacement of units that are in an unsatisfactory condition. In recent years, the concept of the transformer health index as an integral part of resource management was adopted for the condition assessment and ranking of ETs. However, because of the lack of regular measurement and inspections, the confidence in health index value is greatly reduced. The paper proposes a novel methodology for the ET condition assessment and the lifetime increase through the establishment of priorities for control and maintenance. The solution is based on the upgraded health index, where the confidence to the measurement results is calculated using Evidential reasoning algorithm based on Dempster - Shafer theory. A novel, two - level hierarchical model of ET health index is proposed, with real weighting factors values. This way, the methodology for ET ranking includes the value of available information to describe ET current state. The proposed methodology is tested on real data of an installed ET and compared with the traditional health index calculation.

Sign in / Sign up

Export Citation Format

Share Document