https://cris.library.msu.ac.zw//handle/11408/887 2026-04-05T23:58:01Z https://cris.library.msu.ac.zw//handle/11408/6716 Title: Time domain load flow analysis in ETAP for modern power distribution systems: paper presented at Parul University International Conference on Engineering and Technology 2025 (PiCET 2025) Authors: Mashavave Sindiso; Ashish P Shah; Kalpeshkumar J. Chudasama; Nyati Egina Abstract: The study investigates the capabilities of the Time-Domain Load Flow (TDLF) analysis in the Electrical Transient Analyser Program (ETAP) to assess the hybrid microgrids' performance under dynamic conditions. The hybrid microgrid includes photovoltaic (PV) arrays, battery energy storage, and AC-DC converters. TDLF analysis outperforms the traditional steady-state counterparts by providing time-variant analysis, which comprehensively enhances understanding of the power system's performance under dynamic conditions. The study incorporates a 24-hour PV solar irradiance profile and seven events (four load variations, utility voltage impact and two circuit breaker operations). The TDLF results show that the PV system's output power depends on the solar irradiance profile. They also reveal that the DC bus voltage has a maximum deviation of 4%, and the AC bus voltage deviation reaches 17%, raising concern for the system's reliability and stability. Cable voltage drop profiles show that the DC cable has a maximum voltage drop of 0.3%. The AC cable has a maximum of 13%, indicating considerable cable losses. The results indicate that the DC side is stable while the AC side needs attention. The findings highlight ETAP TDLF's effectiveness in assessing hybrid microgrid dynamics and provide valuable insights into improved reliability and renewable energy integration for sustainability. 2025-01-01T00:00:00Z Mashavave Sindiso Ashish P Shah Kalpeshkumar J. Chudasama Nyati Egina https://cris.library.msu.ac.zw//handle/11408/5103 Title: Design of an Automated Vibration Monitoring System for Condition Based Maintenance of a Lathe Machine (Case Study): IEEE 2016 International Conference on System Reliability and Science (ICSRS) - Paris, France.. Authors: Chikuruwo, Mary Nyaradzayi Hughslar; Maregedze, Laurence; Garikayi, Talon Abstract: This article presents an automated vibration monitoring system for a lathe machine. This study was motivated by the fact that machine production time was wasted during planned maintenance when, most times, the machines did not require any maintenance at all. Also, the periodic intervals used did not depict the correct ageing of the machine components which resulted in unexpected failure of the machine. Planned maintenance schedules are done with the assumption that the machine is going to breakdown after a certain period of time. The aim of this research was to come up with a vibration monitoring system for a lathe machine, which included incorporating an electronic circuit in the system, use of liquid crystal display for improved user interface and use of vibration sensors to determine the vibration level of the machine. Experimental research design was used to determine the acceptable ranges of vibration amplitudes in order to classify the amplitude into 4 groups namely: extremely rough, rough, acceptable and smooth. The designed system produced consistent vibration amplitudes for both machining and non- machining operation. The system used different indicators linked to the main processor of the circuit which monitors the machine real-time performance. It was capable of alerting the user when the vibration amplitude was out of range and also to switch off the machine when the vibration threshold was exceeded. The vibration monitoring system helps in damage control and enables preventive measures to be taken before damage occurs. 2016-01-01T00:00:00Z Chikuruwo, Mary Nyaradzayi Hughslar Maregedze, Laurence Garikayi, Talon https://cris.library.msu.ac.zw//handle/11408/4597 Title: An assessment of wind energy potential of the Amatole district in the Eastern Cape Province of South Africa Authors: Masukume, Peace-maker; Makaka, Golden; Tinarwo, David Abstract: South Africa is heavily depended on fossil fuels for its energy needs and is the highest emitter of greenhouse gasses in Africa and 18th in the world. It is therefore imperative to shift to renewable energy sources for power production to mitigate the carbon emissions. The purpose of this paper is to investigate wind energy potential in the Amatole District in the Eastern Cape Province of South Africa. The Weibull density function was used to estimate the wind energy potential in this location. The Weibull parameters, k(shape parameter) and c(scale parameter) varied from 1.651 to 2.026 and 3.093 to 4.310 respectively. The study shows that the area has moderate wind energy potential for decentralized wind energy systems, exploitable at 10m or more for low speed wind turbines. It therefore follows that it is not suitable for large scale wind energy production. 2014-01-01T00:00:00Z Masukume, Peace-maker Makaka, Golden Tinarwo, David