Browsing by Author "Otuoze, Abdulrahaman Okino"

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    Development of Overvoltage and under voltage Protection System for A Residential Building Interfaced with a GSM Notification System
    (Abubakar Tafawa Balewa University Bauchi, Nigeria, 2023-03) Jimoh, Abdulsamad Bolakale; Otuoze, Abdulrahaman Okino; Yesufu, Leila; Jimoh, Abdulrasaq; Omoyeni, Raphael Oluwatimileyin; Omeiza, Isaac Ozovehe Avazi; Abdullateef, Ayodele Isqeel
    Overvoltage and under voltage are undesirable conditions capable of causing damages to electrical appliances. In literature, detection and protection of electrical appliances from these voltage irregularities have been largely explored. Nonetheless, load control during irregularities and fault location remains subjects of considerations. In this work, an overvoltage and undervoltage protection system is designed for a residential building. The voltage limits of 240 V and 200 V are set for overvoltage and undervoltage protection, respectively. The protective system unit is developed utilizing a PIC 16F876A microcontroller. A GSM module, SMS 808, with the capacity to send an SMS and location via longitude and latitude, is interfaced for notification and tracking purposes. With the aid of a variac, five different levels of voltage are fed as input for each condition (normal, overvoltage, undervoltage). At each stage of the tested conditions, the protection system operated as set and notifications were sent as programmed. The results revealed that the device can disconnect the load when there are irregularities as well as notifying the utility company and consumers of the locations.
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    FIRE AND EXPLOSIVE RISK ASSESSMENT FOR COMBUSTIBLE POWDER PNEUMATIC CONVEYOR SYSTEM
    (2020-02) OLADIMEJI, Ibrahim; Otuoze, Abdulrahaman Okino; Akorede, Mudathir Funsho; ABDULKARIM, Abubakr 3.A.I ABDULLATEEF, 4.Olalekan OGUNBIYI; Abdullateef, Ayodele Isqeel; Ogunbiyi, Olalekan
    Failure to properly define operating hazards associated with pneumatic conveying system for combustible powder transportation has led to several incidences of fires and explosions. These hazards are mostly preventable if adequate safety measures are provided for the pneumatic conveying systems for dust and combustible materials during the system design, installation and operating stages. This paper presents assessment on risk of fire and explosive hazards associated with pneumatic conveying system for a combustible powder transportation and prescribe the best practice to prevent possible accident that might result from improper practice. The safety practice and relevant regulations for zoning of the operating area and guide for proper selection of suitable class of measuring instrumentation for safe system operation are enumerated.
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    Smart grids security challenges: Classification by sources of threats
    (Journal of Electrical Systems and Information Technology, 2018-12-01) Otuoze, Abdulrahaman Okino; Mustafa, Mohd Wazir; Larik, Raja Masood
    Smart grids (SGs) deployments have made power systems operation more efficient by the application of distributed computing schemes in grids’ interoperation. However, these schemes have triggered various security issues which are growing to be of major concerns. Physical attacks, cyber-attacks or natural disasters are major notable form of threats to SGs deployment which could lead to infrastructural failure, blackouts, energy theft, customer privacy breach, endangered safety of operating personnel, etc. Hence, the need to critically examine the security issues aimed at preventing possible threats or failures. In this review, various security challenges and threats are discussed with respect to their possible sources of occurrence. These threats are then classified and a framework for achieving more secured SGs is suggested.