Determination of the Causes of Copper Wires Beads after Fire in Vehicles

An electrical installation that simulates an automobile DC power supply system with a voltage of 12 V has been created. An experimental simulation of a short circuit at currents up to 400 A on copper multi-wire and single-wire conductors under normal environmental conditions is carried out. The copper wires beads were annealed in a furnace at temperatures from 700 to 1000 °C for 20, 40 and 60 minutes. Metallographic analysis of copper wires beads was carried out. The temperatures and times that of at which the signs of short circuit and overcurrent are destroyed has been revealed. Obtained results contribute to improvement evidence’s researching in the fire investigation of motor vehicles electrical wiring after a fire. Keywords: Arc beads, Copper, Metallographic analysis, Electrical Short Circuit, Wires.

Counseling on the Importance of Electrical Installation Safety in Tegalpanjang Village

Electricity has a very vital role in everyday life, therefore the electricity network must be properly maintained and protected, otherwise, not only disrupt the need for electricity but it can also endanger human safety. One type of electrical hazard that often arises is fire that caused by the electrical equipment used was not under the PUIL Standard (General Requirements for Electrical Installation in Indonesia) and COE (Certificate of Operation Eligibility). Beside carelessly installation that not comply with regulations that often cause electrical short circuit.. The purpose of this community service is to provide knowledge about the safe and correct household electrical installations to residence of Tegalpanjang especially school student so they can also provide information to other community members about dangers and utilization of electricity as well as correct electrical installation. The result of this service activity is the participants has knowledge upgrading and understanding about the dangers and use of electrical installations to avoid fires caused by electrical short circuits.

Increasing Knowledge Of Electric Hazards And Their Mitigation For Residents Of The Rw 15, Ciwaruga Village, Parongpong District, West Bandung

Electricity is needed by the community because it is easily converted into other forms of energy. Electricity is very useful but at the same time dangerous for humans if they do not have the knowledge, understanding and skills about it. This training was carried out with the aim of providing knowledge about electrical hazards and skills in electrical installation for residents of RW 15, Ciwaruga Village, Parongpong District. With the materials and methods and approaches applied, the training can run smoothly and work well. This success is shown by the active participation and high enthusiasm of the participants during the training and the high level of absorption of the training materials delivered. This is reflected in the increase in knowledge and skills in terms of making good installations as indicated by the increase in the value of the final test results (posttest). In addition, this paper can also be used as a reference for parties who will carry out similar or other activities related to electrical installations.

Nonlinear load influence on single-phase fault current in shipboard electric networks

Описаны результаты исследований влияния показателей качества электроэнергии на токи однофазных замыканий в судовых электроустановках. Выявлены основные элементы бортовых электроустановок, влияющие на качество электроэнергии. Проанализировано формирование высших гармоник в токе однофазного замыкания. На физической модели электроустановки проведены исследования влияния нелинейной нагрузки на ток однофазного замыкания. Результаты экспериментов подтвердили установленные закономерности. Выявлено, что в установившемся режиме ток однофазного замыкания определяется не только величиной фазной емкости и напряжением сети, но и несинусоидальностью тока нагрузки. Экспериментально показано, что высшие гармоники, присутствующие в токе нагрузки, усиливаются в токе однофазного замыкания. При этом увеличение их амплитуд пропорционально номеру гармоники и ее амплитуде в токе нагрузки. Экспериментально установлено, что формирование высших гармоник в токе однофазного замыкания в результате эмиссии нелинейной нагрузкой приводит к увеличению его действующего значения. The paper represents the research results of the power quality indicators influence on the currents of single-phase ground faults in ship electrical installations. The main elements of on-board electrical installations that affect the quality of electricity are identified. The process of higher harmonics formation in the single-phase ground fault current is analyzed. Studies of the nonlinear load influence on the single-phase fault current are carried out on the physical model of the electrical installation. The experimental results confirmed the established patterns. For the steady-state mode it was discovered that the single-phase ground fault current is determined not only by the phase capacitance value and the mains voltage, but also by the non-sinusoidality of the load current. It has been shown experimentally that the higher harmonics of the load current are amplified in the single-phase ground fault current. In this case, the increase at their amplitudes is proportional to the harmonic number and its amplitude in the load current. It has been experimentally established that the formation of higher harmonics at a single-phase ground fault current as a result of emission by a nonlinear load leads to an increase in its effective value.

The expert system for assessing fire risks of electrical installations in the agrarian industrial complex based on neural networks

The article is devoted to the analysis of fire risks of the operation of electrical installations in the agro-industrial complex of the region. According to statistics, the number of fires occurring for electrical reasons is steadily increasing, which makes the issue of fire risk management relevant. In order to identify and prevent these risks, a technogenic safety system has been developed, presented as a set of methods and tools, which are based on the generation of new data on the causes of threats to the operation of electrical installations based on the analysis of data on the current state of the system. Highlighted characteristics such as Human Parameters, Electrical Installation Parameters and Environmental Parameters. Mathematical models of the given components are considered, a fire risk assessment tree is compiled, in which the input parameters and intermediate vertices with the solution methods in them were determined. The developed model can be used to carry out experiments in order to study the behavior of an electrical installation under various conditions. The application of this method is especially important in cases where the removal of indicators and testing of the operation of an electrical installation is impossible due to the risk of injury or material damage.

A Novel Fully Controllable Rotary Switch for Electrical Installation in Buildings

In an electrical installation in buildings, electromechanical switches are mostly used to turn on and off a load. However, sometimes there are two or more switches in the same circuit intended to control the same load. Thus, a conflict can happen between multi-users who are trying to overtake the control of the load (such as turning it on or off). To solve the problem, this paper proposes a novel switch called “Fully Controllable Rotary Switch” (FCRS) in which it can fully control not only the load but also other switches by blocking them or giving them limited or full access over the electrical circuit and the loads. For validation purposes, the utilization of FCRS in buildings is compared to the traditional switches under the same functionality and conditions. Results show that FCRS has the ability to control many electrical loads simultaneously, control other switches in the circuit, increase the satisfaction, security, and privacy of the users. Finally, it reduces the conflict between multi-users and the investment cost by avoiding installing additional switches and protection devices.

Family-Related Determinants and Implications of Low Female Enrolment in Electrical Trade in Adamawa State

Purpose: This study examined the perceived family-related determinants and implications of the low enrolment of female students in electrical installation and maintenance works in government science technical colleges of Adamawa State. Approach/Methodology/Design: A descriptive survey research design was adopted for the study. The population of the study consisted of 13 Electrical Installation and Maintenance Work Trade (EIMWT) teachers and 129 parents of National Technical Certificate Two (NTCII) EIMWT students (either father or mother) in three Government Science Technical Colleges of Adamawa State. The sample of the study comprised of the entire population, thus no sampling was done. A 20-item questionnaire was developed by the researcher and used for data collection. The questionnaire was validated by three lecturers from the Department of Electrical Technology Education, Modibbo Adama University, Yola, Adamawa State. A reliability coefficient of 0.87 was obtained for the instrument using Cronbach Alpha. Mean was used to answer the research questions while a t-test was used to test the hypotheses. Findings: The findings of the study revealed low contribution from the female gender to family income in households and increased level of dependency of the female gender on the males in Adamawa State as major perceived family-related implications. Practical Implications: The study presents practical implications for concerned authorities to work on dismantling the negative perceptions about female education. The results suggest working closely with several institutions to raise awareness and enlighten parents and family members on the prospects of EIMWT, especially to the female gender. Originality/value: The study concludes that EIMWT is a way of investing in the education of females in view of breaking cycles of poverty and social vices that the females might be lured into.