scholarly journals A Novel Model of Electromechanical Contactors for Predicting Dynamic Characteristics

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7466
Author(s):  
Gongrun Wang ◽  
Yongxing Wang ◽  
Lifan Zhang ◽  
Shutian Xue ◽  
Enyuan Dong ◽  
...  
Keyword(s):  
Simulation Model ◽  
Power Supply ◽  
Distribution System ◽  
High Speed ◽  
Flight Time ◽  
High Speed Photography ◽  
Power Switching ◽  
Power Distribution System ◽  
Magnetohydrodynamic Model ◽  
Novel Model

To ensure the reliability of power supply, a dual power supply structure appears in the power distribution system. Power supply switching is a complex physical process. This paper presents a novel model of electromechanical contactors. This model can simulate the multi-physics process of power switching. This article completes the simulation framework for power switching through contactors for the first time. Among them, the structural topology for contactors is also proposed. On the basis of the novel structure topology, an equivalent magnetic circuit model is established to calculate the relationship between driving force, flux linkage, current, and displacement. Then, a co-simulation model is established between the above equations and Adams to obtain the speed characteristics and flight time of the contactor. Subsequently, through the use of Fluent and its secondary development, a magnetohydrodynamic model is established, and the above-mentioned velocity characteristics are imported into it to analyze the arcing characteristics of the contacts under the conditions of the transverse magnetic field and the insulating grid. The effectiveness of power switching is judged by comparing the flight time of the electromechanical model and the arcing time of the magnetohydrodynamic model. The prototype is manufactured and tested on the basis of simulation. Through experimental waveforms and high-speed photography, the accuracy of the simulation model and the practicability of the contactor are verified.

scholarly journals Power distribution system fault monitoring device for supply networks in Nigeria

2019 ◽  
Vol 9 (4) ◽  
pp. 2803
Author(s):  
Olalekan Kabiru Kareem ◽  
Aderibigbe Adekitan ◽  
Ayokunle Awelewa
Keyword(s):  
Power Supply ◽  
Power Distribution ◽  
Distribution System ◽  
Low Voltage ◽  
Copper Wire ◽  
Low Cost ◽  
Monitoring Device ◽  
Power Distribution System ◽  
Fault Monitoring ◽  
Quick Service

Electric power is the bedrock of our modern way of life. In Nigeria, power supply availability, sufficiency and reliability are major operational challenges. At the generation and transmission level, effort is made to ensure status monitoring and fault detection on the power network, but at the distribution level, particularly within domestic consumer communities there are no fault monitoring and detection devices except for HRC fuses at the feeder pillar. Unfortunately, these fuses are sometimes replaced by a copper wire bridge at some locations rendering the system unprotected and creating a great potential for transformer destruction on overload. This study is focused on designing an on-site power system monitoring device to be deployed on selected household entry power cables for detecting and indicating when phase off, low voltage, high voltage, over current, and blown fuse occurs on the building’s incomer line. The fault indication will help in reducing troubleshooting time and also ensure quick service restoration. After design implementation, the test result confirms design accuracy, device functionality and suitability as a low-cost solution to power supply system fault monitoring within local communities.

The Design and Implementation of the Power Distribution Unit in Campus Intelligent Computer Room

2015 ◽  
Vol 736 ◽  
pp. 173-178
Author(s):  
Mei Mei Wu
Keyword(s):  
Power Supply ◽  
Power Distribution ◽  
Distribution System ◽  
Energy Usage ◽  
Power Distribution System ◽  
Line Frequency ◽  
Design And Implementation ◽  
Modern Computer ◽  
Intelligent Computer

This paper described a kind of designation method to the power distribution system in the modern computer room .Compared with the traditional power supply socket, The Power Distribution Unit (PDU) with these functions whichcan monitor the RMS current and voltage, line frequency ,energy usage ,load limitation and the relay controlling to current leak ,over load or over current etc., There also has the wired RS-485and reserved the wireless WIFI interfaces in the PDU through which the working conditionsof equipment in the computer room can be connected and monitored by administrator at any time and place.

scholarly journals Determination of Different Fault Features in Power Distribution System Based on Wavelet Transform

2019 ◽  
Vol 8 (4) ◽  
pp. 6256-6261
Keyword(s):  
Signal Processing ◽  
Wavelet Transform ◽  
Power Distribution ◽  
Distribution System ◽  
High Speed ◽  
Short Circuit ◽  
Voltage Waveform ◽  
Power Distribution System ◽  
Time Frequency ◽  
Skewness And Kurtosis

Nowadays, there are various signal processing methods that have been studied by many researchers in order to detect faults in power lines. From previous literature, signal processing that works based on time frequency analysis has been proven to accurately detect faults at high speed. In this study, wavelet transform is adopted to analyse fault occurrences on power line of distribution network. Three types of faults due to lightning, switching and short circuit fault were analysed based on their voltage waveform profiles. ‘Daubechies’ 4 (db4) mother wavelet and four levels decomposition were implemented to extract the features. Approximation at level 4 (A4) and detail coefficient at level 1 to 4 (D1-D4) were extracted to evaluate the energy, skewness, and kurtosis. Based on the results, lightning showed the highest energy, skewness and kurtosis compared to the short circuit and switching voltage waveform. Therefore, these features can be utilized as the new parameters for fault detection in a power system network

scholarly journals Modeling and Simulation of Power Distribution System in More Electric Aircraft

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Zhangang Yang ◽  
Junchao Qu ◽  
Yingchuan Ma ◽  
Xudong Shi
Keyword(s):  
Power System ◽  
Simulation Model ◽  
Power Distribution ◽  
Distribution System ◽  
Transient State ◽  
Maintenance Cost ◽  
Power Distribution System ◽  
System Integrity ◽  
Electric Aircraft ◽  
More Electric Aircraft

The More Electric Aircraft concept is a fast-developing trend in modern aircraft industry. With this new concept, the performance of the aircraft can be further optimized and meanwhile the operating and maintenance cost will be decreased effectively. In order to optimize the power system integrity and have the ability to investigate the performance of the overall system in any possible situations, one accurate simulation model of the aircraft power system will be very helpful and necessary. This paper mainly introduces a method to build a simulation model for the power distribution system, which is based on detailed component models. The power distribution system model consists of power generation unit, transformer rectifier unit, DC-DC converter unit, and DC-AC inverter unit. In order to optimize the performance of the power distribution system and improve the quality of the distributed power, a feedback control network is designed based on the characteristics of the power distribution system. The simulation result indicates that this new simulation model is well designed and it works accurately. Moreover, steady state performance and transient state performance of the model can fulfill the requirements of aircraft power distribution system in the realistic application.

Design of Safty Network and Power Distribution of Underground Shops of Suqian Powerlong City Plaza

2012 ◽  
Vol 174-177 ◽  
pp. 3013-3017
Author(s):  
Shou Jun Li ◽  
Xiao Ping Ma ◽  
Hong Yu
Keyword(s):  
Power Supply ◽  
Power Distribution ◽  
Distribution System ◽  
Power Loss ◽  
Supply Network ◽  
Power Distribution System ◽  
Network Characteristics ◽  
Profibus Dp ◽  
Empirical Design ◽  
Network Power

This paper focuses on two main aspects including building safty and energy saving of power distribution system. First of all, BACnet protocol based network characteristics of safty system of underground shops of the Suqian powerlong City Plaza is introduced. And then the fieldbus control network which centers around world well-known PLC such as AB ControlLogix, Siemens S7-300 and Siemens S7-400 is mainly adopted in the design of fire linkage system. ControNet network connects to PROFIBUS network by PD-100S protocol convertor which can convert one protocol to another between DeviceNet and PROFIBUS-DP network. In the design of power supply network, power loss caculation of dry-type transformer is considered firstly, and then empirical design mistaken cognition of power supply network is analyzed and solution for improvement is presented.

Research on Spacecrafts Intelligent Power Distribution Technology

2012 ◽  
Vol 182-183 ◽  
pp. 436-439
Author(s):  
Kai Cui ◽  
Zhong Bo Dong ◽  
Bo Li
Keyword(s):  
Real Time ◽  
Power Supply ◽  
Power Distribution ◽  
Distribution System ◽  
Power Supply System ◽  
Supply System ◽  
Power Distribution System ◽  
Higher Power ◽  
Software And Hardware

The development of all kinds of spacecrafts is much smaller and more intelligent, integration increased constantly, one satellite can accomplish more and more expectant missions by using plenty of loads. As a result, higher power, higher reliability and much smarter power distribution system is needed to satisfy the growing quantity of loads. This paper presents the power supply system which characterized by loads observation real time, software and hardware combinational over current protection, bus communication with on board computer, the system has been validated in project and the conclusion has been proved accuracy and reliability.

scholarly journals Analysis of power factor corrections for obtaining improved power factors of switching mode power supply

2020 ◽  
Vol 9 (3) ◽  
pp. 826
Author(s):  
Dimov Stojce Ilcev
Keyword(s):  
Power Factor ◽  
Power Supply ◽  
Power Distribution ◽  
Distribution System ◽  
Power Factor Correction ◽  
Electric Energy ◽  
Electric Power System ◽  
Power Distribution System ◽  
Switching Mode Power Supply ◽  
Switching Mode

This article discusses such an important issue as the power factor of Switching Mode Power Supply (SMPS) and its improvement through Power Factor Correction (PFC). The power factor shows how effectively uses the consumption of electric energy by certain loads connected to the power distribution system with Alternative Current (AC), which is very critical for the electricity-producing industry. The number of power factors is a dimensionless value that can vary from -1 to 1. Thus, in an electric power system, a load with a low power factor draws more current than a load with a high power factor for the same amount of transferring useful power, which may cause overloading of the power grid and lead to over-expenditure of electricity. Otherwise, designing power factor correction (PFC) into modern switched-mode power supplies (SMPS) has evolved over the past few years due to the introduction of many new controller integrated circuits (IC). Today, it is possible to design a variety of PFC circuits with different modes of operation, each with its own set of challenges. As the number of choices has increased, so has the complexity of making the choice and then executing the new design. In this article, the design considerations and details of operation for the most popular approaches are provided.  

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