3 Phase voltage between phases

A three - phase system may be arranged in delta (∆) or star (Y) (also denoted as wye in some areas). A four-wire system with symmetrical voltages between phase and neutral is obtained when the neutral is connected to the common star point of all supply windings. Other non-symmetrical systems have been used.

Voltage between phase and neutral called line voltage. Generally allowable line voltage is 220V to 25V AC ,and phase voltage is 380V t.

If single phase power is 2Watts.

Explanation: The voltages are not scalar summation but vector summation.

So volatges are not added directly , but added by considering the angle between two phases (120° in star connected). A single phase system is perhaps the most common type of system most people are familiar with. This is what people have in their homes and what appliances are plugged in to. For larger amounts of power, three phase systems are used. With the above circuit, the line voltage is roughly 2volts.

Because each phase is phased out by 120°, the voltage between any two phase is 400V. But when you have three phases you can use them in relationship with the other phases , and then the voltage between phases is 400V (230V × ). Even at three phase you can use the 230V. Each wire carries one phase of the three - phase current, and the numbers designate the current phase. For example, Land Tcarry the first phase.

Place one multimeter probe on Land the other on L2. Wait for the multimeter to display the voltage. Make the same test between Land Land between L2 . This technical article describes the basic principles of three - phase systems and the difference between the different measurement connections that are possible. In fact, if the circuit is balance we can solve for the voltages , currents, and powers, etc. The values of the corresponding variables in the other two phases can be found using some basic equations.

Generally, the difference between the highest and the lowest voltages should not exceed of the lowest voltage. Then you divide by the number of phases. If you have balanced three - phase power, where all three phase voltages are equal in magnitude and 120° apart in phase, then: V L − L = × V L − N. Figure 4: Typical Three Phase Voltage Configurations used in the USA.

While both Delta and Wye systems measure 208VAC between any two hot wires, Wye systems also measure 120VAC between any hot wire and neutral. The output voltage is 120Vac line to neutral (L-N). Line to neutral may also be called phase to neutral.

The voltage between the two legs (called phase to phase or line to line) is 240V and the phase to neutral voltage is 120V.