Browsing by Author "L. M Adesina"

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    Development of a distribution transformer substation anti-vandalism using dual surveillance monitoring technique
    (KU8 Consortium International Conference, 2023-08-06) L. M Adesina; O. Ogunbiyi; A. Enoch
    Power system encounter losses such as commercial, non-technical and technical loses. These losses often create serious damages to the power system by reducing the quality of power that is deliverable to the customers. Distribution substations are the most accessible power substation to customers for the supply of electricity. These substations based on their packaging in Nigeria are susceptible to vandalism. This vandalism is becoming a daily occurrence because of high demands for copper and sale of transformer oil in the black market. To minimize the vandalism, this paper presents a development of distribution transformer substation anti-vandalism using dual-surveillance monitoring technique. The method involves a circuitry design that incorporate a PIR sensor to detect human presence in the vicinity of the transformer substation perimeter fencing, a buzzer to sound as an alarm, a GSM module to send out a call/message alerting the operator in charge and a video/camera for surveillance purpose. The system was configured to send video to a dedicated web server in real time when the sensors sense any human presence and also captures image on detection which is sent via email to the operators. A flowchart that illustrates the procedural steps was developed and presented. The device was tested and found perfectly working.
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    Transformer Parameters Monitoring for Distribution Network Operation
    (University of Calabar Press & Greenlab International Scientific (GIS), 2019-09-01) L. M Adesina; O. Ogunbiyi
    Distribution transformers (DT) are the most important and costly components among the equipment required in distribution transformer substations. For the stability of electricity supply, more attention is deserved on monitoring of DT operational parameters such as frequency, active power, reactive power, power factor, etc. Distribution transformers are often failed probably as a result of cellulose deterioration, overloading, poor insulation, poor dielectric strength of the oil, old age etc. Experience shows that utility companies in Nigeria are insensitive to the monitoring of these DT's operational parameters which results in sudden breakdown or persistence outages of the feeder. The utility company may be affected with an approximate reduction in monthly revenue collection compared to previous ones. Thus, it becomes necessary to carry out DT operational parameters’ monitoring for all transformers in the circuit. Planning engineers might have several methods of solving this problem and the approach varies from one country to the others due to variation in operational styles. However, this paper presents a case study of 300kVA, 11/0.415kV Transformer for Parameters monitoring in Distribution Network Operation using Power Quality and Energy Analyzer (PQEA) equipment (Fluke 435 Series II). The pre-set network operational parameters recorded or measured were downloaded via personal computer after the experiments. The experimental results and their graphical analyses by excel application are presented. Recommendations for the utility’s operations and maintenance engineers on the field for compliance are presented. The results obtained show that this approach is a reliable way of monitoring DT parameters for the operational planning of distribution networks.