scholarly journals Methods of Temperature Monitoring in Low Voltage Electrical Cables using Composite Materials

2021 ◽  
Vol 343 ◽  
pp. 03014
Author(s):  
Mircea Florin Drăghici ◽  
Maria Stoicănescu
Keyword(s):  
Composite Materials ◽  
Power Supply ◽  
Low Voltage ◽  
Great Accuracy ◽  
Temperature Monitoring ◽  
Three Phase ◽  
Sensor Temperature ◽  
Temperature Measuring Instrument ◽  
Real Time Information ◽  
Electrical Cables

The article presents the most important methods and technologies used to monitor the temperature of low voltage power supply cables, which supply 400V in three-phase mode, trying to highlight the method of using composite materials, materials that are included in the material constructive of the cables, these having the role of temperature sensor. Temperature monitoring is performed along the electrical cables, to transmit in real time information on the evolution of temperatures along the entire length of the cable, at any point, during their entire life. The article will focus on the method of inserting optical fibres inside the power supply cables, which will be used as a temperature measuring instrument. Using the Reman effect, a method of reflecting the injected light at one end of the optical fibre, by processing the received signals, the evolution of the temperature inside the electric cable can be detected with great precision, over long distances and with great accuracy. the evolution of the temperature inside the electric.

scholarly journals A Decomposition Four-Component Model for Calculating Power Losses in Low-Voltage Power Supply Systems

2021 ◽  
Vol 60 (3) ◽  
pp. 79-91
Author(s):  
Dmitry Tugay ◽  
Olexandr Shkurpela ◽  
Valentyn Akymov ◽  
Ivan Kostenko ◽  
Oleksandr Plakhtii
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Low Voltage ◽  
Supply System ◽  
Total Power ◽  
Power Losses ◽  
Component Structure ◽  
Capital Costs ◽  
Proposed Model ◽  
Three Phase

A new model for decomposition of the total power losses, which includes four components is proposed. Each of the components of the proposed model has a certain physical meaning due to the nature of electromagnetic processes in a three-phase four-wire system. Definitions to describe each of the proposed components are formulated. It is shown that each of supplementary components of the total loss power is proportional to the minimum possible loss power and to the square of the RMS value of the power, which is caused by its occurrence in three-phase four-wire power supply system, and it is inversely proportional to the mean square of the net power loss. The synthesized Matlab-model for verification of the four-component structure of power losses showed a high degree of its adequacy. The proposed model allows us to rethink the description of power losses in three-phase AC circuits and can be used in specialized measuring instruments for electrical networks monitoring. Using the information obtained in the monitoring process, it is possible to plan technical measures to reduce losses of electrical energy in the power supply system, as well as to estimate the capital costs of these measures.

scholarly journals Energy-efficient inverter circuit for the low-voltage asynchronous driver controller with autonomous power supply

2021 ◽  
Vol 279 ◽  
pp. 01004
Author(s):  
Alexander Boldyrev
Keyword(s):  
Power Supply ◽  
Energy Efficient ◽  
Low Voltage ◽  
Power Transistors ◽  
Dc Power ◽  
Three Phase ◽  
Components Analysis ◽  
Inverter Circuit ◽  
Main Components ◽  
Average Consumption

The design of the energy-efficient inverter circuit for the asynchronous frequency-controlled three-phase electric driver with autonomous low-voltage DC power supply. The components analysis of the electric drive, the main components selection approach: microcontroller, three-phase driver and power transistors. R&D prototype of the energy-efficient inverter circuit was created, characterized by an average consumption current reduced by 5%. Reducing energy losses is achieved by reducing dynamic losses in the power circuits of a low-voltage inverter and using several circuit solutions.

scholarly journals D-PMU and 5G-Network-Based Coordination Control Method for Three-Phase Imbalance Mitigation Units in the LVDN

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2754
Author(s):  
Mengmeng Xiao ◽  
Shaorong Wang ◽  
Zia Ullah
Keyword(s):  
Mobile Networks ◽  
Control Method ◽  
Low Voltage ◽  
Control Unit ◽  
Distribution Networks ◽  
Optimal Operation ◽  
Positive Sequence ◽  
Measurement Unit ◽  
Control Units ◽  
Three Phase

Three-phase imbalance is a long-term issue existing in low-voltage distribution networks (LVDNs), which consequently has an inverse impact on the safe and optimal operation of LVDNs. Recently, the increasing integration of single-phase distributed generations (DGs) and flexible loads has increased the probability of imbalance occurrence in LVDNs. To overcome the above challenges, this paper proposes a novel methodology based on the concept of "Active Asymmetry Energy-Absorbing (AAEA)" utilizing loads with a back-to-back converter, denoted as “AAEA Unit” in this paper. AAEA Units are deployed and coordinated to actively absorb asymmetry power among three phases for imbalance mitigation in LVDNs based on the high-precision, high-accuracy, and real-time distribution-level phasor measurement unit (D-PMU) data acquisition system and the 5th generation mobile networks (5G) communication channels. Furthermore, the control scheme of the proposed method includes three control units. Specifically, the positive-sequence control unit is designed to maintain the voltage of the DC-capacitor of the back-to-back converter. Likewise, the negative-sequence and zero-sequence control units are expected to mitigate the imbalanced current components. A simple imbalanced LVDN is modeled and tested in Simulink/Matlab (MathWorks, US). The obtained results demonstrate the effectiveness of the proposed methodology.

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