Electrical Engineering

Electrical protection refers to the sense and command protective relay features provided to control the interruption of electrical service resulting from mechanical or electrical failures or other unacceptable conditions. Electrical Protection includes short circuit and overload protection provided by molded case circuit breakers and fuses, as well as relays. Relay protection is a collection of protective relay devices and systems which monitor the electrical characteristics of equipment and/or power distribution systems to assure power systems and equipment operation remain within predetermined limits. The protective devices initiate the removal from service of any piece of equipment and/or power system which is subjected to an abnormal operating condition exceeding preset limits.

"Torroidal" means donut shaped; a torroidal transformer is one where the core forms a circle. Typically the transformer is placed around a conductor, which is considered the "primary winding" with 1 turn. The secondary winding is the copper wrapped around the circuilar core.

There are a number of solutions for a full home control project. Several manufacturers make control equipment that can be configured to suit the requirements of homes, offices, theaters and more. Manufacturers of equipment are Crestron, AMX, RTI and many others.

The choice of control systems is less important than other considerations. The first decision is what needs to be controlled. It might be the television and sound equipment or perhaps it will include lighting, heating, security and so on.

Next, a whole house control system will need a significant amount of wiring. Although wireless networking has made its way into home control, accept that you will be adding wiring to make it work.

While your existing equipment can probably be controlled, there will be more equipment that will have to be purchased

Finally, a home control system is much more complex than a programmable television control. Configuring the system will involve programming and tha will involve hiring a programmer to do the job. Most control system manufacturers only distribute programming tools to registered and certified programmers so there is rarely a do it yourself option. The operation of the system is dependent on the work of the programmer. Before taking on a programmer, know what you want to achieve and don't be afraid to discuss the operation in detail with a programmer. Don't ever accept a programmer telling you that he knows best. Listen to his advice of course but it's your system so make sure you get the system that you want.

Oh, one last tip. Make sure you have a clear credit card when you start. It won't be cheap.

find the line current first...

i=(150*735.5) / (sqrt(3)*600*0.8)

assume pf of 0.8

the current value gines u reqd fuse rating

In an integrated circuit, electronic components such as resistors, capacitors, diodes, and transistors are formed directly onto the surface of a silicon crystal. The process of manufacturing an integrated circuit will make more sense if one first understands some of the basics of how these components are formed.

Even before the first IC was developed, it was known that common electronic components could be made from silicon. The question was how to make them, and the connecting circuits, from the same piece of silicon? The solution was to alter, the chemical composition of tiny areas on the silicon crystal surface by adding other chemicals, called dopants. Some dopants bond with the silicon to produce regions where the dopant atoms have one electron they can give up. These are called N regions. Other dopants bond with the silicon to produce regions where the dopant atoms have room to take one electron. These are called P regions. When a P region touches an N region, the boundary between them is referred to . This boundary is only 0.000004 inches (0.0001 cm) wide, but is crucial to the operation of integrated circuit components.

I assume you mean hot, neutral and ground. The answer is simple...the advantage is life or death in a home wiring situation. The only true job of electricity is to seek ground and it will find it through the path of least resistance. If the neutral wire of a 110v 2 wire system becomes open, the only path to ground may be your body. If that same wire opens on a 3 wire grounding system, there is a backup path through the ground wire creating a low resistance to ground. Safety issue.

In symmetrical components, there are three types of impedances - positive sequence (balanced), negative sequence (unbalanced), and zero sequence (ground).

In a transformer, positive and negative are equal. Ground impedance is determined by the (same factors as the) positive sequence and is based on the flux paths available through the transformer core that can induce ground current.

With some motor designs, as the motor starts to accelerate, its torque tends to fall somewhat before starting to increase again. The point of lowest torque in this region of the curve is termed the 'pull-up torque'.

In order to decrease voltage without decreasing amperes you have to also decrease resistance.

Ohm's Law: Voltage = current times resistance

The difference b/w the prime generator & standby generator is that the prime generator is used for 24/7/365, while the standby generators are only used in emergency cases, if we used standby generators for more than 24 hours continuously, then it will be overheated for sure.

Its a feedback control system which utilizes the saturation of the main transformer to control output voltage. It is late 1880's technology. Was used 25 years before the invention of the amplifier tube. For more information see this link: https://en.wikipedia.org/wiki/Magnetic_amplifier

AC means alternating current - depending on the frequency, any part of an AC circuit ALTERNATES between being positive and negative - electrolysis will not happen - it relies on ions migrating to one particular electrode/polarity.

- Electrical engineer changes on a regular basis so when your knowledge is out of date, you might find that you will lose your position. That is why it is important to keep yourself up to date with new technology and find a good place of employment that will keep you in their firm for many years.

There is nothing to limit current until opposing magnetic fields build up at generator operating speed-windings will overheat and burn.

It makes the motor run insufficiently.

By this process all errors to be removed and electricity distribution becomes storng. Rectifier always react all abstraction which law given be Ohms.

The clamp on amp meter has to go around both of the parallel conductors to get an accurate reading of the line current. If you are using a current transformer, both wires have to go through the centre hole in the transformer.

Constant losses

Those losses in a d.c. generator which remain constant at all loads are known as

constant losses. The constant losses in a d.c. generator are:

(a) iron losses

(b) mechanical losses

(c) shunt field losses

The circuit has one inductor and capacitor connected in such a way that it produce the resonance condition for only one frequency. on the other hand for double tuned circuit it has more number of reactive elements and it has two tuning frequency. The single tuned circuit is of interest when the poles are imaginary, and rest of the two cases are not more interest. w=wn the time it produce the resonance and the damping factor zeta is zero and the circuit is in undamped condition.