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Power can be measured by placing a power meter in each of the lines. Each power meter has its curent coil in series with the line and its voltage coil between the line and neutral.
Provided the lower ends of the voltage coils are connected together, the sum of the three reading is equal to the total power. They do not have to be connected to the neutral. They could be connected to the other live wire, which leads to the two-wattmeter method:
Two wattmeters are connected with their current coils in two of the live wires. The voltage coils are connected between those two live wires and the other live wire. The sum of the two readings is the total power on the three-phase system.
Additional Information
Blondel's Theorem (Andre Blondel was a French electrical engineer) states that, for both balanced and unbalanced three-phase loads, one can measure the total power by using one less wattmeter than there are number of conductors joining the supply to the load. For example, for a three-phase, three-wire, system, one can use two wattmeters (this particular connection being known as the 'two-wattmeter method', as described in the original answer). For a three-phase, four-wire, system three wattmeters can be used.
Provided the wattmeters have been connected correctly (i.e. provided the polarity markings on their current- and voltage-coil terminals have been taken into account), if one any of the wattmeters reads 'downscale' (i.e. backwards), then either its current or its voltage coil (but not both) must be reversed, and the resulting reading must the be deducted from the total power read by the other instrument or instruments.
Wiki User
∙ 9y ago
Wiki User
∙ 11y agoPower for a balanced three-phase load = √3*VL*IL*Cos Ø
Where:
√3 = 1.732
VL = line voltage
IL = line current
Cos Ø = power factor
Wiki User
∙ 9y agoPower measurements in the electrical field are usually expressed in watts or kilowatts. To find kilowatts on three phase equipment the following equation is used;Kilowatts = Amps x Volts x 1.73 x pf./1000. pf. is the expression for power factor.
Wiki User
∙ 13y ago...in three phase what? Synchronous motor? Transmission line? Much more information is needed.
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Why you deserve phase 3?
You can get a 3-phase supply in most properties by negotiation with the power company, if your demand for electric power is high enough.
When you have 56KVA available in 3 phase supply how much is your available current in 3 phase and how much in 1 phase?
In three phase: I = (three phase VA) / (sqrt(3) x (phase to phase voltage)) for single phase: I = (single phase VA) / ((phase to neutral voltage)) keep in mine three phase VA = 3 x (single phase VA), and phase to phase voltage = 1.732 x (phase to neutral voltage) Therefore the single phase and three phase currents are the same (ie, the three phase currents are the same in all three phases, or balanced). But don't get available current and available power confused (KVA is not the same as KW).
Up to how much HP are single phase motors maufactured?
Horse power is horse power, regardless of what voltages and currents are used. 5 HP single phase is equal to 5 HP 3 phase.
What is the simplest way to run a 3 phase 380 V motor of about 1 KW directly on 220 V single phase supply without resorting to rewinding or frequency converters?
You cannot run a three phase motor on single phase power. You'll burn the motor up within minutes. By the way, I've never seen or heard of a 380 volt motor. Do you mean a 480 volt motor? If so, the only way you can power it is with the correct full voltage and a 3 phase power supply.
Is 3 phase power equal to 3 times the single phase power?
Single phase has two line voltage wires, separate from each other; three phase power has three line voltage wires, actually saving more energy and thus money. +++ The difference is that the power is transmitted divided into 3 parallel lines with the wave forms 120º apart. Energy saving is achieved by using very high transmission voltages hence low currents, feeding step-down transformers in the users' locality.
Is 3 phase power and 3 pole power the same?
3 Phase power is supplied by a 3 pole supply like a breaker. So essentially yes.
How to connect 3 phase power factor correction capacitor?
how to connect power capacitor with 3 phase motor
How do you connected 3 phase motor to single phase power?
Use VFD to make 3 phase from single phase source.
What are some advantages of 3-phase power over 1-phase power?
There are several advantages of 3-phase power over single phase power. First, with 3-phase power, more power can be transferred with the same amount of wire (meaning the amount of copper used in all of the conductors transferring that power) as with single or 2-phase power. Also, power is transferred more "evenly" with 3-phase power because the "next peak" is closer than it is with single and 2-phase power. The 3-phase motors run more smoothly than those run on fewer phases. Also, there are motor design considerations (one being control of the direction of rotation) regarding the motor that make 3-phase power more attractive. Use the link to the Wikipedia article on 3-phase power and skim it. It isn't long and it is quite readable.
What is the electrical engineering 3 phase?
The electrical engineering 3 phase is calculated by mathematics. The total active power is equivalent to three times the power of an individual phase.
Why 3 phase ac systems is preferred to 4 phase?
3 phase system has more power than a single phase system
Why you deserve phase 3?
You can get a 3-phase supply in most properties by negotiation with the power company, if your demand for electric power is high enough.
How you convert the value of single phase power to value of 3 phase power?
Electric power is measured in watts. It does not matter if it is single phase or three phase. All things being equal, for the same load, the power measured in a single phase circuit or a three phase circuit, will be the same.
What is 3 phase voltage in turkey?
The 3 phase power in turkey is either 380 VAC or 400 VAC.
Do televisions use single-phase or 3-phase power?
Answer 1: TV's use single-phase power. Answer 2: TV's use single phase power of 220 or 110 volts ac power depending on what part of the world you live in.
What is the code to phase 3 of power lines?
654478
How can you connect a 3 phase pressure cooker to a single phase supply?
The only ways this can be done is via a motor generator or a solid state inverter. These can convert single phase power to 3 phase power, however they are generally too large and expensive for home use and motor generators are extremely noisy.In a commercial or industrial location 3 phase power is usually directly available from the power company.
