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Why use two wattmeter to calculate the power of a three phase load?
Two wattmeter method is used in a three phase sysstem to measure the true power without regard to the balance ie. It can be used to measure both balanced loads and unbalanced loads.The three phase power could be measured using single phase wattmeters in each loads of the system. But using three wattmeters is quite unnecessary as we can measure it by using only two wattmeters.The three phase power could be measued by using single phase wattmeters , haing a current coil in one line and a potential coil connected between the line and some arbitrary common junction point. If that arbitrary common point is chosen on one of the three lines, then the wattmeter connected to that line will indicate zero power because it's potential coil has no voltage across it. hence, that wattmeter may be eliminated, and the three phase power can be determined by means of only two single phase wattmeters.
Explain the Two wattmeter method of power measurement in a 3 phase circuit?
A single wattmeter can measure power due to one phase only. But circuit arrangements , popularly called: 1) 2-wattmeter method (requiring two wattmeters) 2)3-wattmeter method (requiring 3 wattmeters) can be used for measuring power inn 3-phase circuit. The details of these method can be found in any standard book on electrical engineering.
How to Calculate three phase watts with unbalanced phase current?
You will need to determine the power per phase, and add them up to give the total power of the three-phase load. To do this, you will need to multiply the phase-voltage by the phase current by the power factor -for each phase.
How do you convert a single phase to a three phase motor?
You need three phase power to get three phase power. If you only have one phase, you will need some kind of inverter or motor-generator set. Generally, however, the demands of a three phase motor will exceed the capability and efficiency of these "tricky" solutions. It is best to simply contact your local power company and have them provide the proper three phase power to your facility.
How do you use a one phase motor in place of a three phase motor?
To use a single/one phase motor instead of a three phase motor is possible if you have a three phase power supply as you will only need to tap one of the three phases together with neutral and an earthwire, however to use a three phase motor instead of a single phase will require the provision of three phase power supply.
How do you measure power in a three phase circuit?
Use the following formula Kilowatts = I x E x 1.73 x pf/1000 where pf = power factor. If you have the access to a three phase watt meter, connect it into the circuit for a specific time interval and you will obtain a reading in kWhs.AnswerThe above answer is only applicable to a balancedthree-phase load. If the load is unbalanced, then you need to determine the power of the three individual loads, and add them together. If you have access to wattmeters, then (in accordance with Blondel's theorem) you can use one less wattmeter than there are conductors supplying the load, to measure the total power whether balanced or unbalanced.
Do I need more then 70 kVA 3 phase power supply for a 4 sunbeds in a tanning salon?
You don't need three-phase power; tanning beds run on single-phase. You've got enough amps.
Why multiply single phase power by 1.732 to get equivalent three phase power?
Multiplying single-phase power by 1.732 (which is the square root of 3) gives you the equivalent three-phase power because in three-phase systems, the power is not simply additive. The phases are 120 degrees apart, so to accurately calculate total power, you need to account for the phase shift between them. The square root of 3 helps adjust for this phase relationship.
Can you run a three phase appliance on 240 volt power supply?
No. You need a 3-phase supply that matches the voltage and current rating of your appliance.
Is there a basic difference between a three phase power transformer and a three phase distribution transformer?
The basic difference is the secondary voltages. On a distribution transformer the secondary voltage is very high. This is to overcome line loss for transmission of electricity over long distances. A three phase power transformer is used at the consumers three phase services end to manipulate voltages that consumers need to operate their equipment. The transformer that feeds your house is considered to be a single phase power transformer.
What is the need of single phase to three phase conversion?
There is no need of single phase to three phase conversions. Both service types are available from the local utility company.
Do you need starter for 0.5HP three phase induction motor?
You never need a starter for a three-phase motor.
