Impact of Quality of Repairs and Common Cause Failures on the Reliability Performance of Intra-Bay IEC 61850 Substation Communication Network Architecture Based on Markov and Linear Dynamical Systems

Article Engineering, Industrial

Study of testing and maintenance strategies for redundant final elements in SIS with imperfect detection of degraded state

Aibo Zhang et al.

Summary: Safety-instrumented systems (SISs) use final elements in a dormant state to perform safety functions, but degradation over time can lead to vulnerabilities. Imperfect state revealing during proof tests weakens the effectiveness of follow-up maintenances. Quantifying the effects of imperfect degradation state revealing is crucial for optimizing testing and maintenance strategies for SISs.

RELIABILITY ENGINEERING & SYSTEM SAFETY (2021)

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Article Computer Science, Hardware & Architecture

Formal Analysis of Repairable Phased-Mission Systems With Common Cause Failures

Qi Shao et al.

Summary: This article proposes a hierarchical formal model for the reliability analysis of repairable PMSs with CCFs, introducing the benefits of probabilistic model checking technology. By using this model, researchers can verify system properties and optimize design patterns or task arrangements.

IEEE TRANSACTIONS ON RELIABILITY (2021)

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Article Computer Science, Information Systems

Responsiveness of Multi-Channel IEC-61850 Substation Communication Network Reliability Performance to Changes in Repair Factors

Vonani Clive Mathebula et al.

Summary: The paper presents a method that improves the eigenvalue analysis method by focusing on the incremental responsiveness of the system to imperfect repair factors using absorbing Markov chain and matrix calculus. Results show that while the system is dependent on repair factors, it is perfectly inelastic to repair efficiency factors; diagnostic coverage of the system is critical, with higher elasticity as the factor approaches 100%.

IEEE ACCESS (2021)

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Article Computer Science, Information Systems

Impact of Imperfect Repairs and Diagnostic Coverage on the Reliability of Multi-Channel IEC-61850 Substation Communication Network

Vonani Clive Mathebula et al.

Summary: The impact of repair efficiency and diagnostic coverage on the reliability of IEC-61850 based Substation Communication Network (SCN) was investigated using Markov and symbolic dynamics based on linear dynamical systems. The results suggest that optimal selection of individual factors can achieve the desired reliability and availability, characterized by the spectral gap on the complex plane. The effectiveness of repair efficiency factors is shown to be dependent on the level of system diagnostic coverage, with noticeable impact at low diagnostic coverage levels.

IEEE ACCESS (2021)

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Article Engineering, Industrial

Modelling framework for performance analysis of SIS subject to degradation due to proof tests

Himanshu Srivastav et al.

RELIABILITY ENGINEERING & SYSTEM SAFETY (2020)

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Article Engineering, Multidisciplinary

Reliability and Availability of Multi-Channel IEC-61850 Substation Communication Networks for Mission-Critical Applications

Vonani Clive Mathebula et al.

INTERNATIONAL JOURNAL OF ENGINEERING RESEARCH IN AFRICA (2020)

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Article Engineering, Electrical & Electronic

Safety related functions with IEC 61850 GOOSE messaging

Micaela Caserza Magro et al.

INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS (2019)

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Proceedings Paper Engineering, Electrical & Electronic

Coal Fired Power Plant In-Phase Bus Transfer Simulation of Forced and Induced Draught Fan Motors

Vonani Cilve Mathebula et al.

2019 SOUTHERN AFRICAN UNIVERSITIES POWER ENGINEERING CONFERENCE/ROBOTICS AND MECHATRONICS/PATTERN RECOGNITION ASSOCIATION OF SOUTH AFRICA (SAUPEC/ROBMECH/PRASA) (2019)

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Proceedings Paper Engineering, Electrical & Electronic

Development of In-Phase Bus Transfer Scheme Using Matlab Simulink

Vonani Clive Mathebula et al.

2019 SOUTHERN AFRICAN UNIVERSITIES POWER ENGINEERING CONFERENCE/ROBOTICS AND MECHATRONICS/PATTERN RECOGNITION ASSOCIATION OF SOUTH AFRICA (SAUPEC/ROBMECH/PRASA) (2019)

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Proceedings Paper Engineering, Electrical & Electronic