scholarly journals Some results of voltage increase in marine electrical propulsion installations

2021 ◽  
Vol 2131 (5) ◽  
pp. 052001
Author(s):  
V Romanovsky ◽  
B Nikiforov ◽  
A Avramenko
Keyword(s):  
Single Case ◽  
Short Circuit ◽  
Electrical Energy ◽  
Angular Speed ◽  
Safety Regulations ◽  
Electrical Propulsion ◽  
Strict Compliance ◽  
Full Power ◽  
Quality Of Electrical Energy ◽  
Technical Solutions

Abstract The main voltage parameters of marine electrical propulsion installations, at various load capacities, with further stress assessment are discussed in the article. By considering voltage options, it was revealed that an increase in inductive resistance makes it possible to manufacture a machine with high power, but the quality of electrical energy in transient modes is deteriorated. During starts, reversals, resets and load surges of powerful consumers, large voltage dips will occur on the generator. To solve the problem, including determination of optimal parameters of the generator, based on the multifactorial nature of the task of creating an electric machine for a specific purpose, an analysis of all the necessary parameters was carried out. The main dimensions of the machine depend on its full power, angular speed and electromagnetic loads. The article presents technical solutions considered using the example of a modern multipurpose icebreaker-supply “Vitus Bering”. Also, as an example, an icebreaker of the Taimyr type with a limited draft is considered, for the first time in modern practice, an alternating-changing current EDMS is used. From the experience of operating the icebreakers “Taimyr” and “Vaigach”, the transition to high voltage did not lead to a complication and increase in the complexity of the maintenance of the MPM, although it required strict compliance with safety regulations during the work. During the operation of icebreakers with MPM 6.3 kV, not a single case of single-phase short circuit or electrical injury has been recorded.

scholarly journals Single-phase ground short circuits in the 6–10 kV mains and electrical traumas in the coal mines

2020 ◽  
pp. 113-123
Author(s):  
Kuzmin Sergei ◽  
Keyword(s):  
Single Phase ◽  
Short Circuit ◽  
Coal Mines ◽  
Electrical Energy ◽  
Electrical Equipment ◽  
Electrical Safety ◽  
Electrical Systems ◽  
Switching Overvoltage ◽  
Short Circuits ◽  
Quality Of Electrical Energy

Introduction. This article provides analysis of electrical traumas and single-phase ground short circuits (SPGSC) in the 6–10 kV electrical systems in the period from 1995 to 2018. It has been shown that reduction in the number of SPGSC will improve electrical safety at coal mines. Research aim is to determine the interrelation between the indicated factors based on the statistical data in the 6–10 kV mains of coal mines according to SPGSC minor and moderate electrical traumas. Methodology. Coal production, development of single-phase ground short circuit and changes in numbers of injuries in the period from 1995 to 2018 have been analyzed making it possible to vividly and qualitatively estimate the dynamics of changes in coal output, the number of SPGSC, electrical traumas and determine the interrelation between these parameters. The discovered interrelation between SPGSC and electrical traumas allows to handle the problem of improving the electrical safety more seriously by means of reducing the number of SPGSC. Results. This article shows the main reasons of single-phase ground short circuit incidence depending on time. The article shows the main ways to lower the amount of single-phase ground short circuit in the 6–10 kV electrical systems of coal mines. Summary. Significant reduction in the number of single-phase ground short circuit in the 6–10 kV electrical systems and, as a consequence, reduction of electrical traumas at coal mines can be achieved by means of effectively limiting switching overvoltage, overvoltage in the mode of single-phase ground short circuit, reaching high selectivity of protection from ground short circuit and improving the quality of electrical energy, and limiting the overloading of electrical equipment and cables.

Analysis of Open Phase and Phase-to-Phase Short Circuit Fault of PMSM for Electrical Propulsion in an eVTOL

2021 ◽  
Author(s):  
John Ramoul ◽  
Gayan Watthewaduge ◽  
Alan Dorneles Callegaro ◽  
Babak Nahid-Mobarakeh ◽  
Armen Baronian ◽  
...  
Keyword(s):  
Short Circuit ◽  
Open Phase ◽  
Electrical Propulsion ◽  
Short Circuit Fault

Study of Photoelectrochemical Solar Cell Using WSe2 Crystal

2013 ◽  
Vol 665 ◽  
pp. 330-335 ◽  
Author(s):  
Ripal Parmar ◽  
Dipak Sahay ◽  
R.J. Pathak ◽  
R.K. Shah
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Fill Factor ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Electrical Energy ◽  
Open Circuit ◽  
Cell Parameters ◽  
Photoelectrochemical Solar Cell ◽  
Photoelectrochemical Solar Cells

The solar cells have been used as most promising device to convert light energy into electrical energy. In this paper authors have attempted to fabricate Photoelectrochemical solar cell with semiconductor electrode using TMDCs. The Photoelectrochemical solar cells are the solar cells which convert the solar energy into electrical energy. The photoelectrochemical cells are clean and inexhaustible sources of energy. The photoelectrochemical solar cells are fabricated using WSe2crystal and electrolyte solution of 0.025M I2, 0.5M NaI, 0.5M Na2SO4. Here the WSe2crystals were grown by direct vapour transport technique. In our investigations the solar cell parameters like short circuit current (Isc) and Open circuit voltage (Voc) were measured and from that Fill factor (F.F.) and photoconversion efficiency (η) are investigated. The results obtained shows that the value of efficiency and fill factor of solar cell varies with the illumination intensities.

scholarly journals Engineering of Light Electric Commercial Vehicle

2020 ◽  
Vol 19 (1) ◽  
pp. 63-75
Author(s):  
R. Dorofeev ◽  
A. Tumasov ◽  
A. Sizov ◽  
A. Kocherov ◽  
A. Meshkov ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Electric Vehicle ◽  
Electric Motor ◽  
Field Tests ◽  
Angular Speed ◽  
Maximum Energy ◽  
Driving Cycle ◽  
Thermal Calculation ◽  
Technical Solutions ◽  
The Mathematical Model

The paper describes the process and results of the development of the light commercial electric vehicle. In order to ensure maximum energy efficiency of the developed vehicle the key parameters of the original electric motor. The article also presents the results of power electronic thermal calculation. For the mathematical model of the vehicle, the driving cycle parameters of the electric platform were determined in accordance with UNECE Regulations No 83, 84. The driving cycle was characterized by four successive urban and suburban cycles. The mathematical model also takes into account the time phases of the cycle, which include idling, vehicle idling, acceleration, constant speed movement, deceleration, etc. The model of the electric part of the vehicle was developed using MatLab-Simulink (SimPowerSystems library) in addition to the mechanical part of the electric car. The electric part included the asynchronous electric motor, the motor control system and the inverter. This model at the output allows to obtain such characteristics of the electric motor as currents, flows and voltages of the stator and rotor in a fixed and rotating coordinate systems, electromagnetic moment, angular speed of rotation of the motor shaft. The developed model allowed to calculate and evaluate the performance parameters of the electric vehicle. Technical solutions of the electric vehicle design were verified by conducting strength calculations. In conclusion, the results of field tests of a commercial electric vehicle are presented.

scholarly journals PEMINDAHAN TAPING FASA UNTUK PENYEIMBANGAN BEBAN PADA JARINGAN 3 FASA DENGAN MENDETEKSI ARUS NETRAL BERBASIS ARDUINO MEGA 2560

2017 ◽  
Vol 19 (2) ◽  
pp. 1
Author(s):  
Pandu Wicaksana ◽  
Saiful Manan
Keyword(s):  
Load Balancing ◽  
Distribution System ◽  
Electrical Energy ◽  
Electric Power System ◽  
Current Output ◽  
Before And After ◽  
Neutral Flow ◽  
Unbalanced Load ◽  
Current Value ◽  
Quality Of Electrical Energy

Pandu Wicaksana, Saiful Manan, in this paper explain that the load balance on the 3 phase 4 wire distribution system is very important. Continuous load imbalances can cause a decrease in the reliability of the electric power system and the quality of electrical energy. One consequence of an unbalanced load is the presence of a current flowing in a neutral introduction. The purpose of this study is to find out and analyze the current in a neutral conductor when the load conditions are unbalanced and when balanced. Load balancing is done by manual-remote, which means that the transfer of taping at a load is done by pressing the button that has been integrated with the HMI display. This software is also responsible for displaying current output from the sensor. That way, it can be seen that the current value of the neutral conductor before and after load balancing is done. That the current value of the neutral conductor will be smaller when the load is balanced compared to when the load between phases is not balanced. Keywords: Unbalanced Load, Neutral Flow, SCADA, load balancingReferencesUtami ,Purwanti Bekti. 2016. Studi Kasus Ketidakseimbangan Beban Dengan Perubahan Taping 1 Fasa Pada Penyulang Kalisari 05 Pt. Pln (Persero) Rayon Semarang Tengah. Tugas Akhir Tidak Terpublikasi. Semarang: Universitas Diponegoro.Desiana, Catur. 2015. Perhitungan Susut Daya Listrik dan Simulasi Software ETAP 12.6.0 GunaMenjaga Mutu Tegangan di DaerahSawah Besar Raya Kaligawe Penyulang PDL.13 PT.PLN (Persero) Rayon Semarang Timur.Tugas Akhir Tidak Terpublikasi. Semarang: Universitas DiponegoroGhani, Reza Muhammad. 2016. Alat Pendeteksi Terputusnya Aliran Listrik Pada Jaringan Tegangan Menengah Satu Fasa Menggunakan Arduino Mega 2560 Dengan Memanfaatkan Aplikasi Web. Tugas Akhir Tidak Terpublikasi. Semarang: Universitas Diponegoro.Arduino & Genuino Products. Arduino MEGA 2560 & Genuino MEGA2560. https://www.arduino.cc/en/Main/arduinoBoardMega2560. Diakses tanggal 26 Juni 2017.

scholarly journals Increasing the energy efficiency of an enterprise by point compensating of power quality distortions

2019 ◽  
Vol 140 ◽  
pp. 04010 ◽  
Author(s):  
Egor Zamyatin ◽  
Irina Voytyuk ◽  
Elena Zamyatina
Keyword(s):  
Power Quality ◽  
Electric Energy ◽  
Electrical Energy ◽  
Implementation Costs ◽  
Three Stages ◽  
Pareto Method ◽  
Compensating Devices ◽  
Quality Of Electrical Energy ◽  
The Cost

The cost of any product includes the cost of electrical energy in its production. Enterprises use various methods to reduce the cost of electric energy. One of the most common methods is to reduce the loss of active power in the distribution network of an enterprise. This is achieved by compensating for distortions in the power quality of electrical energy using compensating devices. The method presented in the article offers point compensation of distortions in the power quality indicators of electric energy. Point connection of compensating devices allows their small number to be used. But, at the same time, a greater effect is achieved. The connection points of compensating devices are determined by the developed method. The method includes three stages: collecting data on consumers of electric energy at an enterprise and on the topology of the distribution electric network, analyzing the results obtained using the developed algorithm, and determining connection points using the Pareto method. Also, the developed method was compared with the classical ones according to the criterion of the ratio of implementation costs to the effect of its application.

Natural Chlorophyll-Sensitized Nanocrystalline TiO2 as Photoanode of a Hybrid Photoelectrochemical Biofuel Cell

2012 ◽  
Vol 496 ◽  
pp. 399-402 ◽  
Author(s):  
Kun Qi Wang ◽  
Juan Tang
Keyword(s):  
Titanium Dioxide ◽  
Transport Process ◽  
Short Circuit ◽  
Electrical Energy ◽  
Open Circuit ◽  
Biofuel Cell ◽  
Maximum Power Density ◽  
Photoelectrochemical Biofuel Cell ◽  
Pt Black ◽  
Open Circuit Photovoltage

A photoelectrochemical biofuel cell (PEBFC) generating electrical energy directly from sunlight and biomass was investigated. In this paper, the PEBFC had a natural chlorophyll-sensitized titanium dioxide (TiO2) film photoanode and Pt black cathode. The electron transport process of the PEBFC was described. The performances of the PEBFC were obtained by photocurrent-photovoltage characteristic curves. The open-circuit photovoltage (Voc), the short-circuit photocurrent (Isc) and the maximum power density (Pmax) is 0.53V, 1.000 μAcm-2 and1.1520 μWcm-2 at 0.37 V, respectively. The incident photo-to-current efficiency (IPCE) is 8.4% at 380 nm.

scholarly journals Development of a New Class of Thiocyanate-Free Cyclometalated Ruthenium(II) Complex for Sensitizing Nanocrystalline TiO2Solar Cells

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Surya Prakash Singh ◽  
Ashraful Islam ◽  
Masatoshi Yanagida ◽  
Liyuan Han
Keyword(s):  
Fill Factor ◽  
Open Circuit Voltage ◽  
Short Circuit ◽  
Power Conversion ◽  
Electrical Energy ◽  
Photocurrent Density ◽  
Open Circuit ◽  
Photoelectrochemical Cells ◽  
Broad Absorption ◽  
New Class

We designed and developed a new class of thiocyanate-free cyclometalated ruthenium sensitizers for sensitizing nanocrystalline TiO2solar cells. This complex shows appreciably broad absorption range. Anchoring to nanocrystalline TiO2films for light to electrical energy conversion in regenerative photoelectrochemical cells achieves efficient sensitization to TiO2electrode. With this new sensitizer, there were a power conversion efficiency of 4.76%, a short-circuit photocurrent density of 11.21 mA/cm2, an open-circuit voltage of 0.62 V, and a fill factor of 0.68 obtained under standard AM 1.5 sunlight.

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