working of Static Synchronous Compensator
2009-09-08 09:52:00 working of Static Synchronous Compensator in the tranamission line ? how improve the voltage regulation on tranamission line ? please tell me equation,s ? thank u...
Static Synchronous Compensators
2009-09-08 09:52:00 working of Static Synchronous Compensator in the tranamission line ? how improve the voltage regulation on tranamission line ? please tell me equation,s ? thank u...
Synchronous Generator Keeps Stopping
2009-08-20 19:06:00 Dear folks, I am a newbie here, so please don't mind if i am not that descriptive of the subject. Well, we have a 15 MVA synchronous (hydro) generator with 14 poles,horizontal shaft arangement, rated speed of 428.6 rpm and moment of inertia of 12,000 kgm2. Recently, the machine trip
synchronous induction torque and induction synchronous torque
2009-07-22 12:35:00 difference between synchronous induction torque and induction synchronous torque?
Synchronous Induction Torque vs. Induction Synchronous Torque
2009-07-22 12:35:00 difference between synchronous induction torque and induction synchronous torque?
Different protective relay system for synchronous generators operate in par
2009-06-11 06:14:00 Hi Guys. Would like to know in detail the different protective relay system for synchronous generators operating in parallel. I know that there is the Cross Current Compensation system, the differential current fault relay system and the overcurrent/earth fault protection system. I am
Protective Relays for Synchronous Generators Running in Parallel
2009-06-11 06:14:00 Hi Guys. Would like to know in detail the different protective relay system for synchronous generators operating in parallel. I know that there is the Cross Current Compensation system, the differential current fault relay system and the overcurrent/earth fault protection system.
about reactive power on synchronous generators
2009-05-30 01:30:00 I wonder if there is a reactive power when we have a resistive load in isolated operation how reactive power circulates, i mean if load has no a capacitive component how this reactive power goes and comes, also when we feed a d.c current to the excitation windings so what about the power consumption
Direct calculation of leakage flux at a synchronous generator using FEM
2009-05-10 00:05:00 We simulated a 200MVA synchronous -salient pole- generator, using the 2D finite-element simulation program OPERA (by Vector Fields). We are trying to determine some parameters of the generator such as transient, subtransient and synchronous reactances as well as time constants by applying
How Does a Synchronous Motor Work?
2009-03-23 15:07:00 what is working process of synchronous motor?
Synchronous belt drive parts
2009-03-15 00:15:00 I am looking for manufacturer part numbers and sources for a synchronous belt drive that will connect an electric motor to a jackshaft on an electric motorcycle. Handle Torque up to: 28 ft/lbs Up to 3500 RPM Ratios between 1:1 and 1.3:1 0.75 in shaft sizes Maximu
Large Induction & Synchronous Machines Data
2009-03-07 19:59:00 Hi all, I'm doing a monography on a comparison between large (from 5 MW to 20 MW) high speed (two and four poles) induction and synchronous motor. I'll write about factors that influence the choice of using either one on a industrial application, such as efficiency, power factor correction, torqu
Steam Turbogenerators as Synchronous Compensators
2009-02-24 11:29:00 We have 3 steam turbogenerators 16000 KVA each that are not running now. We project to transformer them to synchronous compensators to generate KVARS and improve the voltage of the national network. So the plan is : 1. To remove the steam turbines, 2. To start the generator as asyn
Synchronous generator Manufacturer
2009-02-12 15:24:00 Hi, I do not know the american market, and i would like to find a manufacturer of synchronous generator which is could supply: - a 3.5MVA - 12kV -60 Hz - 4poles -1800 rpm synchronous generator - conform to Nema MG1 and API546 - Suitable for ClassI /Div2 Could someone help me,
Shaft Generators/Synchronous Compensator
2009-02-09 20:06:00 I want to know how it works/inter connected. pls give ilustration if possible
Synchronous Generator Versus Induction Generator
2008-11-20 16:36:00 We are having 2 mini hydel units of 350kW and 400kW capacity with induction generator. These units were commissioned 15 years ago. Right from commissioning, these units never generated the targeted annual energy generation of 2 MU each. These units are connected to the 11kV rural feeder and there ar
Synchronous Generator vs. Induction Generator
2008-11-20 16:36:00 We are having 2 mini hydel units of 350kW and 400kW capacity with induction generator. These units were commissioned 15 years ago. Right from commissioning, these units never generated the targeted annual energy generation of 2 MU each. These units are connected to the 11kV rural feeder and there ar
Synchronous Motors versus Induction Motor
2008-11-04 18:37:00 TO All.... The scenario is this...we are working on a water pumping station upgrade (located in Maryland, USA) that is currently fitted with four 1,500 hp, 900rpm, 2,400 Volt synchronous motors. Would there be, from an electrical perspective some virtue in encouraging the process engineers to
Synchronous versus asynchronous generators
2008-11-02 17:00:00 What are the specific advantages and disadvantages of using sysnchronous generators over asynchronous generators for units of 400kW connected to the 11kV grid
Synchronous execution of a child XOML workflow
2008-05-05 23:41:00 Previously I came up with a reasonable approach to executing a child XOML workflow asynchronously but what I was really after was executing the workflow synchronously. I eventually realised that the solution to this problem was to fire up another WorkflowRuntime and execute the workflow using that. I now have a WorkflowExecutor class as below.using System;using System.IO;using System.Text;using System.Threading;using System.Workflow.ComponentModel.-Compiler;using System.Workflow.Runtime;using System.Xml;namespace WFBuild.Activities{ /// <summary> /// Executes a workflow synchronously /// </summary> public class WorkflowExecutor { private AutoResetEvent waitHandle; private Guid wfGuid; private Exception ex; public void Execute(string fileName) { WorkflowRuntime workflowRuntime = new WorkflowRuntime(); workflowRuntime.StartRuntime();- workflowRuntime.WorkflowComplet-ed += new EventHandler<WorkflowComplet-edEventArgs>(workflowRuntime-_Wor...
By: Bell End
synchronous vs asynchronous generators for small hydro project
2008-05-04 20:58:00 I am looking to spec generators for small hydro applications of between 5-50Kw. I vaguely recall something in third year regarding hydrogeneration, synchronous, asynchrounous and the pros and cons, alas the cobwebs in that corner of my proffesional brain are quite thick. Can anyone set
Government?s solutions synchronous and comprehensive: expert
2008-04-08 07:43:00 Truong Dinh Tuyen, former Minister of Trade, now the Member of the National Advisory Council for Finance and Monetary Policies, talks about inflation and the measures to fight inflation. What do you think about the current situation? Do you think that inflation is really as worrying as experts say? The inflation now... [[ This is a content summary only. Visit my website for full links, other content, and more! ]]
How to return value from Ajax Function - Use synchronous request
2008-01-29 19:42:00 Have you ever tried to return values from the Ajax function ? Well it might be sometime the cases when you might have to return the value got from the server to another function rather than updating the component. Let’s try to return the values from the traditional Ajax function. SHARETHIS.addEntry( { title: "How to return value from Ajax Function - Use synchronous request", url: "http://roshanbh.com.np/2008/01-/how-to-return-value-from-ajax--function-use-synchronous-reques-t.html" } );
Synchronous and Asynchronous machine
2008-01-25 05:58:00 can anybody explain, what is different syncronous and asyncronous generator? when we use a synchronous generator and an asynchronous generator?
Synchronous condenser
2008-01-09 22:22:00 Synchronous motors load the power line with a leading power factor. This is often usefull in cancelling out the more commonly encountered lagging power factor caused by induction motors and other inductive loads. Originally, large industrial synchronous motors came into wide use because of this ability to correct the lagging power factor of induction motors. This leading power factor can be exaggerated by removing the mechanical load and over exciting the field of the synchronous motor. Such a device is known as a synchronous condenser. Furthermore, the leading power factor can be adjusted by varying the field excitation. This makes it possible to nearly cancel an arbitrary lagging power factor to unity by paralleling the lagging load with a synchronous motor. A synchronous condenser is operated in a borderline condition between a motor and a generator with no mechanical load to fulfill this function. It can compensate either a leading or lagging power factor, by absorbing or sup...
By: electronics
Synchronous Motors
2008-01-09 22:22:00 Single phase synchronous motors are available in small sizes for applications requiring precise timing such as time keeping, (clocks) and tape players. Though battery powered quartz regulated clocks are widely available, the AC line operated variety has better long term accuracy-- over a period of months. This is due to power plant operators purposely maintaining the long term accuracy of the frequency of the AC distribution system. If it falls behind by a few cycles, they will make up the lost cycles of AC so that clocks lose no time. Above 10 Horsepower (10 kW) the higher efficiency and leading powerfactor make large synchronous motors useful in industry. Large synchronous motors are a few percent more efficient than the more common induction motors. Though, the synchronous motor is more complex. Since motors and generators are similar in construction, it should be possible to use a generator as a motor, conversely, use a motor as a generator. A synchronous motor is similar t...
By: electronics
Synchronous conferencing
2007-12-30 22:33:00 Synchronous conferencing is the formal term used in science, in particular in computer-mediated communication, collaboration and learning, to describe text chat technologies. It has arisen at a time when the term chat had a negative connotation. Today it is occasionally also extended to mean audio/video conferencing or instant messaging systems, given they provide a text-based multi-user chat function. The word synchronous in this case is not to be considered a technical term, but rather describing how it is perceived by humans - chat happens in realtime before your eyes. Typical synchronous conferencing technologies include Internet Relay Chat (IRC)MUDsPSYC (Protocol for SYnchronous Conferencing)SILC (Secure Internet Live Conferencing protocol)WebchatsXMPP (Extensible Messaging and Presence Protocol)
3 Phase Synchronous Motors For Learning
2007-12-07 18:21:00 I would like to find a small 3 phase synchronous motor to experiment with. Anyone know of a good source?
Convert Between Synchronous and Asynchronous
2007-11-19 19:25:00 When a program calls a synchronous function, the program halts and waits for the function to finish executing. When a program calls an asynchronous function, the program does not wait and continues to execute while the asynchronous function executes in the background. By default, C# methods are synchronous. Externa-l functions that can take a long time to ...
[Podcast] Thread-Safe Asynchronous Smart Clients
2007-10-12 09:08:00 In this podcast we’ll look at various patterns involved in creating MVC-based Smart Clients which communicate using asynchronous messaging and how to avoid threading problems there. Neil asks: Hi Udi, We’re building a smart client application that uses WCF for full-duplex communications with our server. This is the asynchronous communication you talk about in your podcast. The ...
Hydrogen as a Cooling Medium in a Synchronous Generator?
2007-09-27 15:04:00 can hydrogen used as stator winding cooling medium in synchronous generator??????
Calculating Excitation Voltage and Current from a Synchronous Generator?
2007-09-26 12:07:00 Can any one explain me how can i calculate excitation voltage and current of 660MW generator having Xd=225.5% ,Xd"=21.4(sat), with terminal voltage of...
LM2651_3.3V_EVAL 1.5High Efficiency Synchronous Switching(link)
2007-08-28 18:55:00 LM2651_3.3V_EVAL 1.5High Efficiency Synchronous Switching Regulator Evaluation Board: National Semiconductor Application switching power supplyShare This
URL File Downloader Project - Download Files, including HTML, Asynchronousl
2007-08-19 20:03:00 Scott Dorman - URL File Downloader for .NET Updates "It's been a while since I wrote the first version of my FileDownloader article and class. Since that time, there have been a lot of positive comments about the article and a handful of fea...
synchronous motor
2007-08-16 22:29:00 a 3 ph syn motor is running in healthy condition and all of a sudden one of the wires of the supply to the stator windings breaks. what will happen to...
Synchronous generators
2007-06-15 21:21:00 1) I have read that a salient pole synchronous generator with excitation voltage removed can act as a reluctance motor. Is this applicable only for an...
Why AsynchronousCommunication is in its own project
2007-06-14 21:46:00 I’ve gotten a couple of questions on my MSMQ implementation of an ESB as to why I chose to take the definition of the CompletionCallback and put it in its own project, rather than just putting it together with the IBus interface. The answer to this is that this callback is designed for Controller classes in Smart Clients, at least when employing an MVC style. You see, as the Controller class is the one who decided to initiate the action on the remote service by calling into a Service Agent class, it will also contain the logic for what to do when a result arrives. Therefore, it needs to pass a callback to the Service Agent class, possibly also passing in some other state (for instance, a reference to the form for which it is making this call, if there can be multiple instances of the same type of form open). The only dependency the Controller class has is on the fact that there is asynchronous communication happening - made clear by the tiny assembly containing only the callba...
Asynchronous Transmission
2007-06-11 17:10:00 1. Every character is complete in itself. If a character is corrupted during transmission, then the previous of the next character does not get affected.2. Asynchronous transmission is suited for applications where characters are generated at irregular intervals. 3. The amount of control information that has to be transmitted is relatively higher.
By: Comtech
Difference between synchronous and induction motor
2007-05-16 15:12:00 hi, i want to know what are the difference between synchronous and induction motor.why people normally prefer induction motor in industries(especially...
Asynchronous Processing in Java ME: The Push Registry
2007-05-14 21:51:00 When writing mobile applications, you may encounter situations where you need to execute logic independently of user interaction. For example, your application may need to do something in response to an outside event, such as an e-mail message being received. You could put a loop in your application that periodically checks to see if the conditions for performing the task have been met. However, even if it were supported by the device, this approach could consume valuable resources. A better solution is to use the push registry API, which was added in MIDP 2.0. In this article we will take a look at the features and limitations of the push registry. The push registry allows your application to request that the device launch a MIDlet asynchronously. This ability can be incredibly useful for many types integration. There are two types of push events: push connections and push alarms. A push connection is triggered in response to an inbound network connection. A push alarm, on...
Using a 3-Phase Synchronous Motor as a Generator
2007-05-04 02:43:00 Is it almost possible to convert a 3 phase syn. induction motor into working as a generator?
Geosynchronous Satellite Launch Vehicle
2007-03-26 06:01:00 The GSLV or Geosynchronous Satellite Launch Vehicle was developed by Indian Space Research Organization (ISRO) to launch INSAT-type satellites into geostationary orbit to make India less dependent on foreign rockets. The GSLV improved on the performance of the PSLV with the addition of liquid strap-on boosters and a cryogenic upper stage.It is a three-stage launch vehicle with the first stage being solid-propelled, the second liquid-propelled and the final stage being cryogenically propelled. The solid first and liquid second stages are carried over from the PSLV. The GSLV used cryogenic upper stage supplied by Russia, having ordered 7 upper stages. India originally tried to buy the technology to build a cryogenic upper stage from Russia, but under pressure from the United States, that technology was not provided. Therefore, ISRO has been working on developing a cryogenic upper stage for the past eleven years.A geostationary orbit (GEO) is a geosynchronous orbit directly above the E...
Errors, Exceptions, and Asynchronous Web Services
2007-03-23 23:33:00 When a client initiates an action on a service by sending it a command message, it is reasonable to assume that that client will want to know about the success, or failure of that action. When working with today?s Web Service technologies, many developers perform these Web Service calls synchronously and have the service throw ...
Errors, Exceptions, and Asynchronous Web Services
2007-03-23 23:33:00 When a client initiates an action on a service by sending it a command message, it is reasonable to assume that that client will want to know about the success, or failure of that action. When working with today?s Web Service technologies, many developers perform these Web Service calls synchronously and have the service throw ...
Synchronous Motor
2006-09-26 00:00:02 Is it possible to run a 4160v 3phase synchronous motor with brushless exciter, on a VFD instead of the usual across the line or auto-transformer start...
Asynchronous Callback R Us - part 2
2006-08-23 11:06:33 In part 1 of this topic, a different kind of API was presented for asynchronous callbacks. Pretty quick, in the comments, Ralf pointed out the problems with this approach. These problems are very typical in multi-threaded scenarios and manifest as hard to find (and reproduce) bugs. However, in cases where we are performing "highly asynchronous work", like sending a request to another machine, where that request will be processed, and a result eventually sent back over the network, this kind of API could make it clear that we are NOT performing in-process multi-threading, and that the expectation of execution time should not hold. And the code that enables this API (note: this is from memory): public delegate void CompletionCallback(int errorCode); public interface ICallbackRegistrar { event CompletionCallback Completed; } public class CallbackRegistrar : ICallbackRegistrar { private RegisterCallbackDelegate toCall; public CallbackRegistrar(Delegate toCall) { this.toCall = toC... |
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