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If you are measuring the voltage of a three phase power system you take only two phase in account then why there is a need for third phase?
Answer Take all phases into account. Voltage is measured between two phases of the three phases at one time, so what this means is this...first you read voltage between line 1 and line 2...then you read voltage between line 2 and line 3...and then from line 1 to line 3. Each phase of a 3 phase system is 120 degrees from the other in a 360 degree pattern. It takes all 3 phases to start a 3 phase motor but can run on two. If a 3 phase motor tries to start on two phases it is refered to as single phasing and can damage the motor.
Another Answer
First of all, let's get the terminology correct. The wires that join a three-phase load to its supply are called 'LINE conductors', not 'phase conductors'! This is very important. Phases, which are normally inaccessible, are either the generator windings, the transformer windings, or the individual loads, connected to the line conductors -this can make measuring phase voltages very difficult unless you can access the interior of these machines/loads.
The voltage of a three-phase system is normally defined in terms of its line voltage, not its phase voltage, so one normally measures its line voltage by connecting a voltmeter between any two line conductors or terminals. As the line voltages are determined by the supply system, all line voltages should be the same, regardless of which line conductors you choose to place the voltmeter between.
The important thing, however, and this is something your voltmeter will NOT tell you, is that the three line voltages are out of phase with each other -each lagging its predecessor by 120 electrical degrees. And this is important, because it is the phase displacement between these voltages, not the magnitude of each voltage, that allows -for example- a three-phase motor to self-start.
What else can I help you with?
Is line voltage or phase voltage mentioned on transformer nameplate?
It depends how they are connected. If they are connected between line conductors then they are measuring line voltages. If they are connected across phases then they are measuring phase voltages.
How do you calculate 440v phase?
Let's get the terminology correct. A 'phase voltage' is measured across a phase, whereas a line voltage is measured between two lines. So there is no such thing as a 'phase to phase' voltage -it's a line to line voltage (hence the term 'line voltage').
What is line voltage in star connection?
Phase to phase voltage is 1.732 (the square root of 3) times the phase to star point (neutral) line voltage.e.g. if the line voltage is 220Vphase voltage = 1.732x220 = 380V (approx)Additional AnswerYou might also like to know that the line voltage leads the phase voltage by 30 electrical degrees. And, incidentally, the correct expressions are 'line-to-line' not 'phase-to-phase', and 'line-to-neutral' not 'phase-to-neutral' (think about it, a line voltage is measured from the junctions between adjacent phases, so they cannot be 'phase to phase'!)
What is total voltage in 3phase supply when one of the phase becomes zero?
There is no 'total voltage' in a three-phase system. There are three line voltages and three phase voltages.
How do you wire a 110 V DB board from a 220 V 3 phase transformer supply?
In a wye system the voltage between any two wires will always give the same amount of voltage on a three phase system. However, the voltage between any one of the phase conductors (X1, X2, X3) and the neutral (X0) will be less than the power conductors. For example, if the voltage between the power conductors of any two phases of a three wire system is 220v, then the voltage from any phase conductor to ground will be 110v. This is due to the square root of three phase power. In a wye system, the voltage between any two power conductors will always be 1.732 (which is the square root of 3) times the voltage between the neutral and any one of the power phase conductors. The phase-to-ground voltage can be found by dividing the phase-to-phase voltage by 1.732 answer from ground and any phase
IF YOU HAVE A 277 volt circuit IN you go from PHASE 1 to ground what will your voltage be?
In a 277-volt circuit, if you measure the voltage from Phase 1 to ground, you should read approximately 277 volts. This is because 277 volts is typically the line-to-ground voltage in a three-phase system where the phase voltage is 480 volts. Therefore, when measuring from the phase conductor to ground, the voltage remains the same at 277 volts.
Is line voltage or phase voltage mentioned on transformer nameplate?
It depends how they are connected. If they are connected between line conductors then they are measuring line voltages. If they are connected across phases then they are measuring phase voltages.
How do you calculate low phase voltage of a three phase four wire system without using voltmeter?
The formula you are looking for is - phase voltage/1.73 = phase to neutral voltage.
Is the voltage in a three-phase system stated by the phase-to-phase or phase-to-ground voltage e.g. 500kV or 290kV?
The voltage in a three phase delta system is stated by the phase to phase voltage. If it is a wye connection the phase to neutral is represented by the two voltages. e.g. 120/208, 240/415, 277/480, 347/600, 7225/12500, etc.
What is the 11kv phase to earth voltage?
6350.8 volts AC rms. The phase to earth voltage is ( square root(3) ) x lower than the phase-phase voltage on a 3 phase system.
What are the phase voltages if the line voltages are 100volts?
It depends on the type of three-phase system. If it's a three-wire system, then the phase voltage is numerically equal to the line voltage. If it's a four-wire system, then the phase voltage is numerically equal to the line voltage divided by 1.732 -in your example, this works out to be 5.77 V.
Three phase voltage in india?
It is 230V single phase and 440V in 3 phase system at 50 Hz.AnswerIf the single-phase voltage is 230 V, then the three-phase voltage must be 400 V, not 440 V. The line voltage is 1.732 times the phase voltage.
What is voltage phase to phase 380 3 phase?
Voltage phase to phase in a 380V 3-phase system refers to the voltage measured between any two of the three live conductors in the system. In a balanced 3-phase system, the phase to phase voltage is equal to the line voltage, which is 380V in this case. This voltage is commonly used in industrial and commercial applications to power heavy machinery and equipment. It is important to note that the phase to phase voltage is higher than the phase to neutral voltage in a 3-phase system.
How do you convert 440 voltage line to voltage phase?
To convert a 440V line voltage to phase voltage in a three-phase system, you divide the line voltage by the square root of 3 (approximately 1.732). This means the phase voltage is calculated as ( V_{phase} = \frac{V_{line}}{\sqrt{3}} ). For 440V line voltage, the phase voltage would be approximately 254V.
How do you calculate New Zealand 3 Phase Voltage?
To calculate the three-phase voltage in New Zealand, you typically use the formula for line-to-line voltage (V_L) in a three-phase system, which is V_L = √3 × V_Ph, where V_Ph is the line-to-neutral voltage. In New Zealand, the standard line-to-neutral voltage is 230V, so the line-to-line voltage would be approximately 400V (230V × √3). Ensure that the system's configuration (such as star or delta) is taken into account when performing calculations.
Is transmission voltage a phase to phase voltage or a phase to ground voltage?
Phase to Phase voltageCorrection to the above answer:There is no such thing as a 'phase-to-phase' or 'phase-to-ground' voltage. The correct terms are 'line-to-line' (or 'line voltage') and 'line-to-ground' (or 'phase voltage'). Transmission-line voltages are line-to-line (or 'line') voltages.
How do you calculate 440v phase?
Let's get the terminology correct. A 'phase voltage' is measured across a phase, whereas a line voltage is measured between two lines. So there is no such thing as a 'phase to phase' voltage -it's a line to line voltage (hence the term 'line voltage').
