Summary of subject lines like all components of the electrical power system, for
unexpected breakdowns for multiple reasons. This reduces malfunctions of the reliability
of the system, and is a source of threat to the continuity of power supply. In
order to
prevent these crashes completely is not feasible, you must design an integrated protection
system is being coordinated action among all its organs to identify and separate the
holidays quickly so the damage caused by this failure the system capacity as possible.
Network protection devices are installed to protect it from faults that may occur, and
prevent their spread and protect the system from un normal operating situations resulting
from such faults. protection systems to identify, classify and locate of faults through
systematic analysis of network parameters) voltages/currents, (and then send a signal to
circuit breakers on separation to separate and isolate the infected component.
This thesis took up the study of The effect of wind plants connection on protection system
in distribution networks on behaviour of protection devices used should (over current) and
compare the results with those protections work behavior when connection with regular
generators. we found through modeling and simulation results that a wind station to impose
changes on the structure of power system of protection zones and protection devices in
response to the types of faults occurring and the reason for the delay in the work of these
protections.
In this essay we will study the using of OPC standard in adapting and removing the
incompatibility between different components and devices in the control system . The OPC
works as a third party that connect between devices (data sources) and progr
ams that
require this data , in case those programs may can't connect directly with that devices as a
result of incompatibility between them. This incompatibility happens because these
devices and programs are from different vendors or because the devices are very old and
can't connect with newer programs. OPC will be a suitable solution for communications
problems between the devices and programs in the control system, the OPC will connect to
each of them and transfer data as good as if the connection between them is direct without
any third party.
The importance of this suggested technique will be shown practically in this essay
through the implementation of it in solving one of the pumping control system problems in
the Syrian Company for Oil Transport (SCOT). the suggestion was to use a OPC Server
program (Kepware OPC Server) and a SCADA program ( WinCC flexible) instead of the
old SCADA program and keep the old PLC devices , in this way we can get rid of the
problems that appear in the old SCADA program and therefore we can ensure that the
system will work as wanted with no problem. That will bring benefits to the company and
results to high reliability in the work.
The weigh feeders constitute an essential part of any production facility, where its
control and supervision system is one of the important things that should be characterized
by precision and reliability.
From this research we will try to develop
the unreliable control and supervision
system of the weigh feeders in mills of raw materials department in Tartous cement and
building materials company. The work Will focus on trying to avoid errors and problems
that the old control system suffered in order to reach the best possible performance of
weigh feeders, facilitate maintenance process and reveal the problems as they happen by
proposing controlled weigh feeders by programmable logical controllers from SIEMENS
corporation with processor (CPU 315-2 PN / DP), and design supervision and collection
data system using software (WINCC Flexible sp3 2008).
We'll apply the steps of the study practical on the weigh feeder of mill of raw
materials, and we will conduct the necessary tests to ensure the validity and accuracy of the
new control system, therefore the range of reliability.
Background: The Arak is a common alcoholic spirit in Syria, where it is produced in licensed enterprises and by some proud farmers that produce it from their grapes. However, this drink is often produced outside the controls of the manufacturing cycl
e in terms of fermentation and distillation, thus exposing the consumers to risk of methanol poisoning, which confirms the need to submit Arak’s production to the control as extremely essential.
Materials and Methods: This study is based on a database built on a series of investigations of alcohol poisoning cases; methanol was detected and rated according to the standard chemical methods, where the results have been analyzed and treated by the statistical analysis method used in pharmaceutical research.
Results: The study showed the amount of variation in the concentration of methanol depending on the difference in the method of preparation fermenting grapes between domestic and industrial way. It also showed the role of repeated distillation to reduce the concentration of this toxic substance Conclusion: The results of the analysis reveal the importance of treating the high concentrations of methanol by the repeated distillation process to reach the allowable value, furthermore the importance of applying the control system to provide the quality of this popular spirit.
studied in this research the general provisions of this system competent as the authority issuing and conditions of ordering, These conditions are divided into objective and formality, and then we talked about the content of the judicial control syst
em which is a positive obligations and negative obligations imposed on the defendant and show us that the number of negative obligations more than positive obligations, and can modify these obligations at any time addition or deletion. And it ends judicial control system in two ways either violating its obligations and here replaces the arrest Reserve and act as a penalty, and the abolition of judicial control system at the request of the defendant or the public prosecutor.
Traffic jam is a serious problem in our life, it causes waste of time and energy, conventional traffic light control system works with a fixed time and fixed cycle. This paper proposes an intelligent traffic light control system with a changeable gre
en time and cycle depending on traffic density. Traffic parameters (cars’ numbers, density, flow) are collected by Loop Detectors located at each traffic signal, this data will be transmitted to the PLC controller then, PLC processes this data to produce controlling commands, it is also connected to a SCADA system which supervises the process and provides an automatic and manual control.
The proposal system applies Green Wave method to connect between two junctions based on a real car velocity and sets priority for emergency car, when Loop Detector detects this car the program will be interrupted to open the traffic light needed.
This intelligent system is experimented with conventional control system s’ data the obtained result is promising, it can reduce the green time, cycle time, and delayed time of each car at traffic light to its’ minimum value.
This search aims to identify management practices of earnings and to indicate whether internal control system effectively contributes to the reduction of such practices, to achieve the goal the researcher follows inductive and deductive approaches an
d 160 copies of a questionnaire were distributed to two samples of professionals and academics.
Using statistical tools and techniques analysis (arithmetic mean and standard deviation and T-test) and statistical package (SPSS) we found out that there was a coefficient relationship between dependent variable – internal control system – and independent variable - management practices of earnings. The more efficient the internal control system is the more limited is earnings management.
This paper presents an automated system to continuously monitor and
control pollution levels of different types of pollutants in industrial plants.
Steel producing complexes are considered in this paper to represent an
example of industrial plants
. The proposed system consists mainly of two
major parts; the pollution measuring equipment and the automation system.
The measuring devices are sensors, actuators, etc., located at the potential
sources of pollutants such as dusts, stacks and chemical processes.
