Research Article
Analysis of Customer Interruption Cost with Reliability Indices on Distribution System
Nyein Nyein Chan, Tin Tin Htay, Hla Myo Tun, Devasis Pradhan
Middle East Research Journal of Engineering and Technology; 11-16.
https://doi.org/10.36348/merjet.2026.v06i01.002
The reliability of electric power systems plays a vital role in ensuring continuous and high-quality electricity supply to consumers. This study presents an analysis of customer interruption costs (CIC) in relation to reliability indices such as System Average Interruption Duration Index (SAIDI), System Average Interruption Frequency Index (SAIFI), and Customer Average Interruption Duration Index (CAIDI), etc. according to the IEEE Standard 1366. The main objective is to quantify the economic impact of power interruptions on different customer categories: residential, commercial, and industrial, etc. and to evaluate how system reliability performance affects these costs. Using reliability data and customer survey information, customer interruption cost are developed to estimate the financial losses associated with various outage durations and frequencies. If the even minor improvements in reliability indices lead to significant reductions in customer interruption costs, emphasizing the importance of targeted investments in reliability enhancement programs. The findings of this study provide valuable insights for utility planners, regulators, and policymakers in optimizing system reliability while balancing economic and customer satisfaction considerations.
Review Article
Modeling and Analysis for the Improvement of High Voltage AC Transmission System Using Static Synchronous Compensator
May Nwe Yee Tun, Soe Soe Ei Aung, Hla Myo Tun, Devasis Pradhan
Middle East Research Journal of Engineering and Technology; 17-25.
https://doi.org/10.36348/merjet.2026.v06i01.003
This paper emphases on improving the performance and stability of high voltage AC transmission system by implementing a Static Synchronous Compensator (STATCOM). The modern electric power system has many challenges due to rising the load demands, long distance transmission and the integration of renewable energy sources. These factors subject to voltage instability, power quality deterioration in high voltage AC transmission network. One of the most effective methods for improving voltage regulation and system stability is the use of static synchronous compensator, STATCOM. In this study, a high voltage transmission system is modeled and analyzed using MATLAB to observe the impact of STATCOM. Simulation results demonstrate significant improvements in voltage stability, power loss and power transfer capacity when the STATCOM is integrated.
Research Article
Diagnostic Indicators of Broken Rotor Bars in Induction Motors
Sergey V. Derkachev, Vladimir A. Sidorov, D.Sc
Middle East Research Journal of Engineering and Technology; 26-33.
https://doi.org/10.36348/merjet.2026.v06i01.004
Induction motors are widely used as the primary drive for industrial installations due to their high reliability, ease of control, and low operating costs. In operation, broken rotor bars in a squirrel-cage winding are among the most challenging faults due to their prolonged development period and diagnostic difficulty. An analysis of the literature leads to the conclusion that, despite the abundance of existing methods for diagnosing broken rotor bars, there remains a need to develop methods that improve the reliability of detection. This improvement can be achieved by shifting from analyzing only the current spectrum to the complex processing of interrelated instantaneous values of currents and voltages, which will enable the extraction of more robust diagnostic features. Preliminary studies on the possibility of diagnosing broken rotor bars using vibrometry methods confirmed the complexity of test impacts, the subjectivity of diagnostic symptom manifestation, and the low amplitude of fault-related components. These findings necessitate the development of approaches based on measuring electrical quantities. The aim of this work is to develop methods for diagnosing broken rotor bars by monitoring the angle between the generalized vectors of stator phase currents and voltages, or by monitoring the sum of stator phase current angles, using instantaneous current and voltage values. The practical value of this approach lies in the possibility of fault diagnosis using standard industrial measurement tools. This aim is achieved through theoretical research and testing of the developed diagnostic methods based on a mathematical model of an induction motor. The model accounts for the distributed rotor winding and is built on a system of complete differential equations presented in a three-phase coordinate system for stator currents. This approach allows for obtaining instantaneous values of phase currents and voltages for the subsequent determination of diagnostic criteria: the angle between the generalized vectors of phase currents and voltages, and the sum of stator phase current angles.
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