| Subject | Date Asked | Expert |
|
| heaters | 12/27/2006 | cleggsan |
Q: I would like to know in just a little detail what the differences are between fan,convector and ...
A: Well, last question first: Heat is heat and power is power. Electrical power is in watts. It is ...
|
| RTD And electrical heater | 12/26/2006 | cleggsan |
Q: How are the RTDs connected to the winding let say a motor. Is it hook up like the current ...
A: Temperature dependent resistors are used in a motor for protection such that when the temperature ...
|
| Generator as a motor. | 12/25/2006 | cleggsan |
Q: Generator as a motor. Our generator is connected to 6kV busbar. Normal operation would be the ...
A: Most generators have switching circuits that reconfigure the winding connections for motor use. ...
|
| Voltage Drop Effects | 12/25/2006 | cleggsan |
Q: Let say according to design I have to install a cable with voltage drop 5V/m. For a distance about ...
A: Simple, the voltage drop will be more or less, depending on what gauge wiring you are using. The ...
|
| Gas Turbine Gen | 12/25/2006 | cleggsan |
Q: 1.In the protection system of generator, there is under/over frequency relay. How does this relay ...
A: I think my previous question answered this. The automatic controls are very sophisticated ...
|
| Gas Turbine Generator | 12/24/2006 | Dave Nyce |
Q: 1.In the protection system of generator, there is under/over frequency relay. How does this relay ...
A: 1. There are several ways. One way is to use a counter that counts the frequency signal for a fixed ...
|
| Gas Turbine Generator | 12/24/2006 | cleggsan |
Q: 1.In the protection system of generator, there is under/over frequency relay. How does this relay ...
A: The relay is to cut out if the frequency shifts too far away from the line it is connected to. The ...
|
| ICCP System and Sacrificial Anode | 12/24/2006 | cleggsan |
Q: 1.In our plant we use ICCP system. L:et say I install 10 sacrificial anodes at 10 points. So one ...
A: I am still not too sure which system you are talking about, but most corrosion and connection/bus ...
|
| Impressed Current Cathodic Protection And Sacrificial Anode | 12/24/2006 | cleggsan |
Q: In our plant we use ICCP system.We placed several sacrificial anodes (10) at several points(10).Let ...
A: Sorry, I must know which system you are talking about. This kind of system: ...
|
| differential signal | 12/23/2006 | Dave Nyce |
Q: I see in some documents people say that we can transmit differential signal.But I do not understand ...
A: A typical single ended signal could be with two wires, where one has a voltage of either 0V or 5V, ...
|
| wireway calculations | 12/21/2006 | cleggsan |
Q: It might seems like I am gonna ask to do my homework but it is not.Currently I am studying NEC ...
A: Sorry, I can't help on this one. I don't have the National Electric Code requirements handy and I am ...
|
| PWM concept and inverter | 12/20/2006 | cleggsan |
Q: I was told the output of PWM is a sequence of squarewave.This squarewave actually come from the AC ...
A: http://www.cpemma.co.uk/pwm.html The above is a good tutorial on how PWM works. ...
|
| PWM concept and inverter | 12/19/2006 | cleggsan |
Q: Most inverter use PWM concept.TYhe output of itis a square wave, but how can it(squarewave) relates ...
A: PWM or pulse width modulation is a means whereby the amount of energy is controlled by the width of ...
|
| UPS Inverter Failure | 12/19/2006 | cleggsan |
Q: I do not really understand the answer for nomber 1.Could you clarify?...from loading the ...
A: A short circuit is an overload. The most sever overload since the load impedance is "zero". Any ...
|
| AC/DC Relay Circuit | 12/18/2006 | cleggsan |
Q: You may or may not want to answer this question, but let me give you a little background first. My ...
A: Relays with external contacts for switching will hand the ac just fine. All you need is a very ...
|
| overheating transformers | 12/18/2006 | cleggsan |
Q: I have a customer with a strange problem. In a high-rise hotel he has a 480v buss riser. On every ...
A: Well, you may have confused the readings OR the lines are mismarked and the A phase and C phase are ...
|
| Shorted Battery | 12/18/2006 | cleggsan |
Q: We know the negative plate and positive plate in a battery separated by separator.So how can these ...
A: First let me refer you to this site for a quick review of battery operation: ...
|
| UPS Inverter Failure | 12/18/2006 | cleggsan |
Q: Questions regarding UPS 1.There are many causes can make the inverter in UPS to fail.Among them are ...
A: http://www.ybet.be/en-hardware-2-12/ups.htm The above may help with an overview of ups ...
|
| Liquid conductivity | 12/17/2006 | cleggsan |
Q: I have a unique problem that I am at a loss to resolve. I have a couple of ideas but am unsure if ...
A: So, you want to know the routing of the vinyl tubes so that you can cut into the floor and avoid ...
|
| UPS | 12/17/2006 | cleggsan |
Q: most of gutor and UPS use thyristor,scr.but i do not understand the operation of thyristor ...
A: Oh, here is the deal on a thyristor: http://en.wikipedia.org/wiki/Thyristor Thyristors, scrs and ...
|
| Meggering | 12/17/2006 | cleggsan |
Q: Just now I meggered a compressor winding for 15 HP AC.Two compressores actually.For compressor 1, ...
A: that helps. I suggest you, also, using a plain and simple vom, check for shorts to the case, shorts ...
|
| DC generator output at variable RPM | 12/16/2006 | cleggsan |
Q: I have a self-made wind turbine (daughter's project) with a 12VDC 10amp motor/generator attached to ...
A: Resistive load would be in ohms. Is the load a 10 ohm resistor? (E = I*R, or R = E/I = 3v/.3a = 10 ...
|
| Meggering | 12/16/2006 | cleggsan |
Q: Just now I meggered a compressor winding for 15 HP AC.Two compressores actually.For compressor 1, ...
A: I am confused. Meggering is usually for testing insulation qualities from windings to case or ...
|
| UPS | 12/16/2006 | cleggsan |
Q: 1.Most of the UPS use this thirystor bridge rectifier that hac something we call firing pulse.What ...
A: You did not send me the make and model you are talking about. Not all ups circuits are the same. ...
|
| UPS | 12/15/2006 | cleggsan |
Q: For UPS normally we are using Lead acid/Nicad or VRLA battery.Could you exolain the VRLA? And what ...
A: Valve Regulated Lead Acid batteries are designed for rugged, compact use. They use tougher ...
|
| Experiment to find Inductance of inductor | 12/14/2006 | cleggsan |
Q: This is one of a series of experiments for a project, this one is to calculate the inductance of an ...
A: Yes, that is true only if the R is equal to the inductive reactance. It may be a better choice to ...
|
| Stymied on how to calculate this | 12/13/2006 | cleggsan |
Q: I wanted to know if you take an acyclic generator homopolar generator (faraday disk high current low ...
A: Let me repeat: If the generators are connected in a series circuit the current must be the same in ...
|
| Samsung TV Convergence problems | 12/13/2006 | cleggsan |
Q: Now the TV will not turn on, therefore no audio or video. I can hear it attempt to start up and then ...
A: As you know, diagnosing long distance without seeing the symptoms is, at best, a guessing game to ...
|
| Stymied on how to calculate this | 12/13/2006 | cleggsan |
Q: I wanted to know if you take an acyclic generator homopolar generator (faraday disk high current low ...
A: Nice discussion on the Faraday disc generator at: http://en.wikipedia.org/wiki/Homopolar_generator ...
|
| Samsung TV Convergence problems | 12/12/2006 | cleggsan |
Q: Suddenly the screen on my Samsung HCN4226W arched at the top and colors red, blue and green became ...
A: Yes, I would say it is a failure of the STK ICs in the convergence circuitry. They must be replaced ...
|
| UPS | 12/11/2006 | cleggsan |
Q: 1.How can a capacitor boost the starting for motor.From what I know the capacitor functions are to ...
A: Yes, that is true, but there is lead and lag in the capacitor as it takes time to store the energy ...
|
| UPS | 12/11/2006 | cleggsan |
Q: 1.Why cant we connect UPS neutral with the main neutral bar? 2.How do we check at the UPS the ...
A: 1. You can if you want to. However, then it is tied to the supply lines through the ground and ...
|
| d.c motor,generator and a.c motor, generator | 12/11/2006 | cleggsan |
Q: uses of dc, a.c generator and motor in industries applications and formulaes
A: Do you have a question? Motors and generators come in many, many sizes, shapes and designs. They ...
|
| Meggering | 12/10/2006 | Dave Nyce |
Q: 1.What is the concept behind meggering a cable and the voltage we inject?Why we inject? 2.Let say ...
A: I would not call it "injecting" a voltage. I would call it "applying" a voltage. With two ...
|
| Generator Exciter and Diode | 12/10/2006 | cleggsan |
Q: 1.What are the fucntions of the exciter in gas turbine generator? 2.What are the fucntions of the ...
A: Exciter controls the magnetic field in the generator system and controls the output voltage and/or ...
|
| Electric motors | 12/8/2006 | cleggsan |
Q: I am not sure the questions that I have need to be directed to a person with your back round or if ...
A: Yes, this is out of my direct area; but an interesting question. It is one that I would delve into ...
|
| automotive electrical system | 12/8/2006 | Dave Nyce |
Q: computers are able to receive and process both analog and digital signals. True or False?The EEPROM ...
A: The actual "computing" part of any modern "computer" only works with digital data. When analog ...
|
| question | 12/8/2006 | cleggsan |
Q: what is exciter and its uses?
A: There are many exciters - a term used in computers, radio, power, microwave, etc. For example, in ...
|
| electricity | 12/7/2006 | cleggsan |
Q: what is the difference between electronic current and conventional current? how these two currents ...
A: No difference; maybe just different terminology being used. Current is current; it only comes in ...
|
| electricity | 12/6/2006 | cleggsan |
Q: what will happen if we provide dc to a bulb instead of ac?
A: If it is an incandescent lamp and you apply the same voltage it will make no difference. If it is a ...
|
