Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userStudying of the distributions of electromagnetic field resulting from the three-phase transmission line over earth
دراسة توزع منحنيات الحقل الكهرطيسي الناتج عن خط نقل القدرة ثلاثي الطور فوق الأرض
676
0 19
0
(
0
)
Authors
نبيل متوج( باحث )
Created by
Shamra Editor
Ask ChatGPT about the research
يتألف خط نقل القدرة من ثلاثة نواقل ثلاثية الطور تتوضع في المستوي z=d فوق سطح الأرض. أجريت الدراسة على مجموعة من النواقل الثلاثة المتوازية ذات تباعد أفقي متساو. يتوضع الناقل المركزي الأول في المستوي y=0 بينما يتوضع الناقلين الثاني و الثالث في المستويين y=±3m على الترتيب. تم تحديد مركبات الحقل الكهرطيسي في النقاط القريبة من خط النقل عالي الجهد الذي يرتفع عن سطح الأرض بمقدار 15m بالطريقة التحليلية. و بعد إيجاد منحنيات توزع شدة الحقل الكهرطيسي بتابعية البعد عن الخط المركزي y، لاحظنا أن شدة الحقل الكهربائي لها قيمة عظمى عند الموضع y=±9m، و حقل التحريض المغناطيسي من مرتبة الميكروتسلا.
The power line consists of three wires, three-phase in the plane z=d over the earth surface. This study was carried out on the equally spaced horizontally conductor configuration. The central conductor 1 lies in the plane y=0 while conductors 2 and 3 in the planes y=±3 m, respectively. The components of electromagnetic field at all points near high- voltage transmission line is determined in analytical method. This study shows that the electric field strength has a maximum value at position y= ±9m, but the values of the magnetic induction field is of the order micro -tesla.
References used
Ronold W.,P.King and Tai T. Wu. The complete electromagnetic field of a threephase transmission line over the earth and its interaction with the human body, American Institute of Physics, 1995
Thomas P., Harward Health Lett. 18,I,1993
Morgan M.G., measuring power frequency fields. Carnegie Mellon University, Pittsburgh,1992
rate research
Read More
The purpose of research is to build a model of the electric driving system for threephase
squirrel-cage induction motor using oriented electric field method so as to control
both the speed , flux and current, ( PI ) controllers was used .
The mach
ine model has been formed based on the equations of the machine written
in the stationary coordinates .
To complete the process of control without measuring the rotor flux , a model of flux
from the measured values of stator current and rotor speed was build, and it can be
measured directly .
This research presents a study of distribution of the
electromagnetic fields in three-phase distribution transformer
200kVA-20/0.4kV through the conclusion of the governing
electromagnetic equation and solve it using finite element method
by FEMM4.2 program.
The study of electromagnetism in electrical machines is critical, especially in the field of
design, investment and optimal performance. To achieve this, there are many ways in which
varying degrees of accuracy . The main aim of this piece of resea
rch is to study electromagnetic
fields distribution in 3ph-induction machines using computational numerical methods and proper
software, because these fields form the basic principle in machine 's work. It has been used the
finite element method aided computer to solve magnetic equations (Maxwell equations).
The simulation of magnetic field in induction machine performed by ANSYS-software. The
paper shows technique for finding the electromagnetic fields distribution in all parts inside 3phinduction
machine to get optimal design.
In this paper, the development of the drive system of the motor Wire port Crane
according to the principle of the indirect field orientation.
Require the operation of the port Crane operations, different operation situations of
variable speed and
Torque with time, which is a case dynamic electro and electro-magnetic
transient, may affect the performance of operations, so therefore been building motor Wire
port Crane operations system corps in winches achieve:
- High performance and Efficiency.
- Build the desired control system according to the principle of the Pulse Width
Modulation (PWM) and the main power system, taking into account the reduction of
changes DC-Link voltage and achieve maximum flux before starting the motor.
- Reduction of excess Voltage that may appear on a DC-Link, using the brake
Transistor with Brake resisters.
At the end of the research has been reviewed and the search results that indicate the
outstanding performance of the proposed system with the ability to use the same system to
run automated processes different.
The present research shows the possibility of improving the factor that regulates the relative potential of the three -Phase Non-Salient-Poles Synchronous Generator by Reducing the Flux Leakage Reactance of fixed coil of the stator, at a fixed ai
r gap and the out-put data.
We proved that the flux-leakage reduction at these conditions,leads to increase the generator circumspection stability,and possibility of the coil-volume excitation reduction. This reflexes the reduction of the generator price at the same out-put data,instead of the ordinary method to rise the stability of the synchronous generator and the potential regulation-factor by the air-gap volume increase.
We used the log-method to outline the relative potential regulation factor calculation depending on the practical map of the tension of the synchronous generator,considering the magnetic saturation and drawing the curves of the relative potential regulation and the stability factor by changing the leakage percentage reactance, the (S.C.R.) circuit, and the percentage change of the excitation coil cross-section(A2%),through changing the relative potential regulation .
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
