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Electrical Wiring
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4,935 Questions
Convert kw single phase to 3 phase kva?
KVA is the unit for the apparent power i.e it's the vector sum of the true power in KW and the reactive power in reactive volt-amperage. So, to get the value of the KVA for the 30KW,just divide the active power(30kw) with the power factor of that load.
How much power is in a 120V line?
Most 120 Volt appliances have their Watts listed somewhere on the appliance. Divide this number by 1,000 to get kilowatts. Determine the rate you are charged for electric power. Your electric bill will tell you how many kWh(kilowatt hours) you use, and what the total charge is. Divide your total charge ($?) by the kWh used. In northern Illinois, we are charged about $0.11 per kWh. Multiply the number of hours the appliance is used by its power consumption in kilowatts. This gives you the number of kWh the appliance used. Then multiply that kWh value by the rate for your area that you determined from your electric bill. That will be the cost for the number of hours the appliance was on.
Example: If I toast 2 slices of bread in my toaster, it takes about 3 minutes, or 0.05 hours. My electric bill is $61.38 and I used 558 kwh for that month. Dividing $61.38 by 558, I get about $0.11 per kWh. So, I divide my toaster Wattage (750) by 1,000 to get 0.75 kW. So now I can multiply the hours that the appliance was used (0.05) by its power consumption rate in kW (0.75). This result is 0.0375 kWh of energy used. Then I can multiply the rate the electric company charges ($0.11) by the energy used (0.0375 kWh). The final result is $0.004125.
What are splices and taps in wires?
A tap splice is a splice that is made usually in a mid span of aerial feeder conductors. It is used to connect a home from a utility company's secondary service drop on the street where the span is between poles and it is not convenient to connect a mid span home to either pole. Tap splices are also made in underground services where the utility feeders are in conduit between junction boxes. Each home along the route has an underground conduit from the junction box to the homes meter base. In the junction box where the home service wires connect to the utility feeders, this splice is known as a tap splice.
What is single phase and 3 phase power system?
single phase motor have a single winding and in three phase motor have a three winding
AnswerA three-phase alternator (generator) has three stator windings, physically displaced from each other by 120 degrees. When the field winding rotates, it induces three, separate, voltages into each winding which are then displaced from each other by 120 electrical degrees.Depending on the way in which the alternator's windings are connected, you then have either three or four external wires that will connect that alternator to the load (usually via three-phase transformers). Three of these wires are 'hot' and called 'line conductors' and the fourth is called a 'neutral conductor'.
The potential of each line conductor is displaced from the other line conductors by 120 degrees, and the potential difference between each line conductor is called a 'line voltage'. The potential difference between any line conductor and the neutral is called a 'phase voltage'. For a four-wire system, the line voltage is 1.732 time the value of the line voltage.
A single phase connection is obtained by connecting a single-phase load either between any two line conductors of the three-phase system, or between one of the line conductors and the neutral conductor -depending on the level of voltage required.
Alternatively, a single-phase system could comprise an alternator with just one winding, and supplying two conductors, a line conductor and a neutral conductor.
Answer: Single-phase is a pair of conductors providing ac power, with the voltage following a sine-wave of variation with time, usually with a frequency of 50 or 60 cycles per second (Hz). Three-phase uses three single-phase supplies with the sine-waves peaking 120 degrees apart during one 360-degree cycle.
That is useful because it means that the instantaneous sum of the three currents is zero, and therefore the three neutral wires can be replaced by one wire that is common to all three circuits and no net current flows in the neutral provided the three circuits supply equal currents. When that happens no power is lost in the neutral, and the transmission losses have been halved when compared with three separate single-phase supplies.
In many cases the neutral wire is retained in case the three circuits have to supply unequal currents, which is a three-phase four-wire system. Alternatively when the load is balanced (equal currents in the three circuits) the neutral can be omitted altogether and that is a three-phase three-wire system.
Power distribution worldwide uses three-phase for efficient transmission, except for low-power low-voltage supplies (120/240v) as used for residential properties and small businesses.
What is used to splice aluminum wire to copper wire?
Yes, but you have to use connectors designed for that purpose. Using ordinary wire nuts could cause a circuit failure due to a high resistive junction.
What is the effect to a three phase system if a single phase load is drawn from it?
A single-phase load can be connected to a three-phase supply either by connecting it between any pair of line conductors or, for a three-phase, four-wire, system, between any line conductor and the neutral conductor -providing, of course, that the resulting voltage matches the requirement of the single-phase load.
This is quite a common arrangement, and the utility company will always try to maintain a reasonably 'balanced' load by connecting a number of single-phase loads between alternate line conductors (e.g. A-B, B-C, C-A, etc., or A-N, B-N, C-N, etc.).
So, to return to the question: 'What is the effect on a three-phase system if a single-phase load is connected to it?', the answer is that the three-phase system can normally deal with it without any problem.
Can you charge a 8.4 volt battery with a 7.2 volt charger?
It sounds like you have nickel-cadmium batteries, since 7.2 volts is an integral multiple of 1.2 volts. You should notcharge a nickel-cadmium battery with any charger that is not specifically designed for it. The issue is that overcharging these batteries will damage them, and that the battery voltage alone is not enough to determine state of charge. (You have to measure the slope of the voltage, and detect the inflection point which occurs at full charge. This is a very specific thing, so the battery must be matched to the charger.)
How do you test a 3 phase service?
Contact your power provider or power company. 3 phase sometimes is not available in certain areas (mostly rural). They have to run extra wires from the power pole or grid to your place where you want 3 phase.
Can you convert a 240 volt air compressor to run from a 120 volt house outlet?
First, check the specification plate for the voltage rating. If it says 110/220V then you *can* change the voltage on the motor. If it only says 220V, then you can *not* practically change the voltage on the motor. There are how-tos on how to convert motors and how to run dedicated 240V lines for power tools on this site, which you should check first. However, here is a brief description of how to change the voltage on the motor you describe: # *FIRST* FOLLOW ALL SAFETY PRECAUTIONS. Make sure that the power is disconnected, that all rotating components have stopped, etc. *YOU* ARE RESPONSIBLE FOR YOUR OWN SAFETY. # Remove the cover plate on the back of the motor. The back of the motor is the side opposite to the side with the rotating shaft sticking out. # Change the input voltage to the motor. Note that standard 240V AC power consists of two "hot" leads of opposite phase, whereas standard 120V AC power consists of one "hot" lead and one neutral lead. Also, both of these power connections may or may not have a third lead which is ground. # On the circuit board (visible after the cover plate has been removed) there are terminals marked with numerals "1" through "6". Remove the 240V wire altogether by disconnecting it from terminal "6" and terminal "1", plus ground wire if installed.
# Find the electrical connection on the circuit board with the brown wire. For a 240V installation, the brown lead will be connected to the terminal marked "3". For a 120V installation the brown lead will be connected to terminal "5". # Switch the brown lead from terminal "3" to terminal "5". This converts the Gould Century electric motor to 120V. # Connect a new 120V wire to terminals "1" and "6". Note that the "hot" lead of the 120V wire should be connected to terminal "1", and the neutral lead should be connected to terminal "6". Hook up the ground lead in the same location as it was disconnected from.
# Replace the cover plate removed in step 1.
How do I calculate diesel generator emissions?
From AP-42 . Chapter 3.1 , Table 3.3-1 Multiply power by AP-42 factor Example for NOx: 300 HP * (0.031 lb/HP-hr ) = 9.3 lb/hr Apply the same method for SO2, PM10 and CO Factors : SO2 = 0.00205 CO = 0.0068 PM10 = 0.0022 Good Look...!
Can a 600 volt 3phase electric motor run on 1phase?
Yes it can run when single phasing in a delta configuration but the motor will not start from a dead stop. There will be quite a bit of degradation in its operation from its nameplate data.
Can you wire a 240v single phase and nutral UK motor to 240v 2phase supply in Canada?
In North America, you can connect a 240-V load across two lines (not 'phases') of a three-phase system with a 240-V line voltage. In Europe, you would need to connect the load between any one line conductor and the neutral conductor.
The term, 'negative ground' or 'negative earth' refers to the system of chassis-grounding, or chassis-earthing, used in vehicles. With this system, the negative terminal of the battery is directly connected to the metal parts of a vehicle, while the positive terminal is connected to the various electrical devices (lamps, etc.) using insulated conductors. The vehicle's metal parts ('chassis') then act as the return conductor to the battery.
The term, 'unbalanced system' refers to an unbalanced load. Under normal circumstances, an unbalanced load leads to unbalanced line currents. The line voltages are determined by the supply and remain symmetrical, even when the load is unbalanced. As your question refers to a 'line to neutral' voltage (i.e. a phase voltage), you must be referring to a star (wye) connected load, in which case the phase voltage (line to neutral voltage) is 0.577 (the reciprocal of the square-root of 3) times the line voltage (line to line voltage).
Can you use three phase power for a dwelling unit service?
no
AnswerWhereas most countries have single-phase residential supplies, some countries, such as Cyprus, often have three-phase supplies. The main distribution panel ('consumer unit') must be designed and assembled to accommodate either a single-phase supply or a three-phase supply; you cannot use a single-phase distribution panel with a three-phase supply.
Single phase AC motor winding formulas?
Single-phase motors efficient because the circuits are less complex; fewer electrical steps must be taken to achieve a desired output, so less power losses , how ever efficient=P(out)/P(in) , P(out) which more related for power losses as heated ,iron losses, stray losses and mechanical losses.
Can you Show diagram of 3 phase motor circuit?
Connect the three wires that come out of the motor to the three supply wires that come from the magnetic contactor. Turn the power on and push the start button. If the motor turns the wrong way, shut the power off and change any two wires in the motor junction box.
What connection is the higher ampere between delta and wye?
For the same load, delta provides higher current than wye, or star.
Wye voltage is 1 / 1.732, or 0.577 that of delta. (1.732 is the square root of 3.) This gives a power of 0.333 for wye, as opposed to delta. (0.5772 = 0.333)
This is why (no pun intended) we use wye-delta starters on large motors - it allows them to come up to speed at 1/3 power, before switching to full power on delta.
What is the RMS volts formula for 3 phase system?
In three-phase systems, we always consider individualline or phase currents, or individual line or phase voltages. In other words, we treat currents and voltages no differently from single-phase currents or voltages (i.e. we don't 'combine' them because they are three-phase quantities). So these quantities are expressed in r.m.s. values.
Does an in ground swimming pool have to be grounded?
Grounding a pool is serious business, there are many risks if this is not done right. Grounding also varies depending city, county, state, country. For starters, you can't have a good enough ground for your pool. This is one case where more is better. As a general rule, you could drive a 10 ft copper ground rod at each corner of the pool. Then you could drive more 10 ft copper rods at each end and the middle. On each metal pool stanchion you have to put a suitable sized grounding lug that's threaded into the metal. You then start a #6 bare copper wire from the first rod and clamp and run it continuously through each stanchion.
You then tie the end back into the first rod creating a ground loop/grid. Again, this varies from place to place. Here is my suggestion. Call your local electrical inspection department, and see what they want done. Before it's closed in, weather decked or concrete it has to be inspected for your safety. When in doubt, always consult a licensed electrician from your area for local rules.
Molecule with a positive end and a negative end?
Polar molecules have partial negative and partial positive charges on opposing sides. They have a net dipole as a result of the opposing charges.
What will happen if two phases collides each other in three phase four wire system?
Generally if two phases are overlapped high voltage appears across the load . . . Before tht the generally a three phase 4 wire exists at outgoing of transformer hence at house hold applications the service mains trips . . .
AnswerI think you mean. 'What happens when two line conductors touch each other?' The answer is that there will be a short-circuit, which will cause the protection system to disconnect the circuit.
Difference between 3 pole and 3 phase?
Phases in AC refer to the number of sine waves of alternating current used to generate the average voltage. In 2 phase, two opposing sine waves are overlapped to give the average voltage delivered, eg 240V in household supplies.
In 3 phase, three sine waves are overlapped to produce a more consistent average voltage.
