Electrical Wiring

slip power is a power which is develop by the induced voltage and current in an induction motor

For a 3 wire 240-volt single-phase motor, typically one overload unit would be required. The overload unit would protect the motor from overheating due to excessive current draw. It is important to select the correct size overload unit based on the motor's full load amperage.

I assume you are asking about AC generators.

The controller is wired up with suitable transducers and other control wiring to obtain required signals from the electrical bus.

Three DG sets are feeding the common bus bar through isolating breakers.

Conditions for a successful synchronization are equal voltage, equal frequency (Hertz) defined by the speed, same phase sequence. (say R Y B phases must match with R Y B of the incoming DG set)

One DG is started with some load (at least 60 to 70 % of load) and the common bus is energized. The second DG to be brought in by closing the breaker either manually or automatically. Start the second DG. The controller reads the bus parameter and incoming DG parameter in real time and moment the incoming DG parameters match with running DG parameters, controller allows the incoming breaker to close. Both DG are now synchronized and load is shared. Same way put on third DG set and synchronize.

Yes, it is possible and was in common use during the early 20th century. In a two phase system the phases are 90 degrees apart. It is important to note the difference between the 3 wire single phase common in North American homes and true two phase power. As far as I know, there are few, if any two phase systems still in use.

See

http://en.wikipedia.org/wiki/Two-phase_electric_power

for more information.

The utility company can provide a 480 volt, single phase service from a single phase transformer, usually with a three wire service. 480 volts is measured between the two line conductors, and 240 volts is measured between either line conductor and the common neutral conductor. The voltage of the line conductors are at 180 degrees with respect to the neutral conductor.

There is a heated bimetallic strip that provides a time delay small overload protection. When its contact makes, it energizes a coil to trip the breaker. Some breakers are mechanical, though.

There is a coil that trips the breaker instantly on large overload.

If the motor is designed for 120V or 220V whatever the case, it will function properly.
If it is a 12V motor and you supply 120V it will make a mess and you will probably get hurt from flying debris!

On a single winding secondary the connection terminals are labeled X1 and X2. A ground wire is connected to the X2 terminal and then connected to the transformer frame and then connected to the system ground.

Additional Answer

In Europe, centre-tap transformers are not used for single-phase supplies. The neutral is provided by simply earthing (grounding) one end of the secondary winding, and taking the line conductor from the opposite end. This provides a single nominal voltage of 230 V between line and neutral. The earth conductor for the secondary winding is segregrated from the earth conductor which earths the transformer's core and tank.

It's highly probably that the '240 V' refers to the machine's phase voltage. In which case, its line voltage will be 1.732 times larger -i.e. 415 V. Phase voltages are measured between any line conductor and the neutral conductor, whereas line voltages are measured between any pair of the three line conductors.

If resistance increases and voltage stays the same, then current decreases.

Ohm's Law: Current equals Voltage divided by Resistance.

identify the three organizations whose local, state, and federal requirements you need to comply with at the HazMat Awareness level.

Cables are rated are by the max current they can supply. To work out the current load you need to divide the Watts by the Voltage (which is either 120 or 240 depending on where you are).

In the UK: 4kW/240V = 4000/240 = 16Amps, so the cable would probably be rated for 20 amps.

In the US the current is 32Amps, so the cable would probably be rated for 50 amps.

First, the amps drawn will be different depending on the supply voltage. You do not say which yours is - 208? 460? 4,160? Second, manufacturers normally give two different current figures, one for the motor running with full load, and one for 'locked rotor'. Locked rotor current is the very high current drawn when power has been applied, but the motor has not had time to start spinning. No one that I know of publishes 'current at no load' for their motors. Since a motor with no load is not doing anything useful, no one really cares how much current is being drawn. It's kind of like putting your car up on a jack so the wheels are off the ground and asking how much fuel will the car burn sitting still with the wheels turning at 50 miles an hour! Also, since a three phase motor does not have a neutral connection, it is, in effect, always delta connected. Delta and wye connections have the same voltage and phase characteristics IF you do not have a neutral. The motor cannot tell the difference.

Your electric bill is computed in kilowatt-hours. This is a measure of power over a period of time, which is a combination of volts and amps. Amperage at 240v would be half that of 120v, but obviously the voltage is double. So the net watts are the same. As a result, your net kilowatt-hours will be the same whether you use 120v or 240v.

Three phase ovens are made for home use. It is important however to know if the home is wired for three phase or for single phase.

No.

If the motor runs backwards, swap any two phases to reverse the rotation, like this:

Old wiring:

phase A - brown wire - motor lead T1

phase B - yellow wire - motor lead T2

phase C - orange wire - motor lead T3

New wiring:

phase A - brown wire - motor lead T2

phase B - yellow wire - motor lead T1

phase C - orange wire - motor lead T3

Power Factor applies to all A.C.(alternating current) power supplies. It ma not be apparent when a purely resistive load is applied as this offers a PF of 1.0 but any other load type will have a power factor somewhere between 0.0 and 1.0.

You can't convert kVA (kilovolt.amps) to current (amps) unless you know the source voltage and/or load resistance (ohms) which is drawing the current from the source.

If you know the voltage in kilovolts, you just divide the kilovolt.amps figure by the number of kilovolts and the result is the current in amperes.

If you know both source voltage and load resistance you can use Ohm's Law to get the current:

I = V / R

In words, Ohm's law is:

Current (amps) = Voltage divided by Resistance (ohms)

All a switch does is make and break the supply of electricity to the lamp.

If you get a chance to visit a science museum ask them to show you a "knife switch". Another place to see one is the Physics Lab at your local college or high school. Once you have seen a knife switch you will understand exactly how a basic switch works. It's quite simple really: a switch is a device which can be used to make or break a circuit. If that circuit carries a voltage which would be dangerous to people or animals then the handle of the switch must be made of a good insulator and the rest of the switch must be well shielded to stop anything else touching any live wires.

by using dc volts across pairs and with an analog meter to check the deflection of the needle to determine if they are in phase

1.8 kilowatts = 2.4 hp

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The conversion is 746 watts are equal to 1 horsepower. To change 1.8 kilowatts to watts is 1.8 x 1000 = 1800 watts. Therefore 1800/746 = 2.4 horsepower. This is how the answer above was obtianed.

There are 195 countries depending on what country you're in