Three-phase balanced circuits||Line to Line Voltages in relation to neutral voltages||Hiren Kherala

Опубликовано: 20 Октябрь 2024
на канале: Essential Electrical

652

Electrical Power System: Three-phase balanced circuits
Topics Covered:
1. Three-phase balanced circuits.
2. Phasor diagram of Line to Line Voltages in relation to neutral voltages

There are two types of systems available in the electric circuit, single-phase and three-phase systems. In a single-phase circuit, there will be only one phase, i.e the current will flow through only one wire and there will be one return path called neutral line to complete the circuit. So in a single-phase minimum amount of power can be transported. Here the generating station and load station will also be a single phase. This is an old system using from the previous time.

In 1882, a new invention has been done on a polyphase system, that more than one phase can be used for generating, transmitting, and for load system. The three-phase circuit is the polyphase system where three phases are sent together from the generator to the load.

Each phase is having a phase difference of 120o, i.e 120o angle electrically. So from the total of 360o, three phases are equally divided into 120o each. The power in the three-phase system is continuous as all the three phases are involved in generating the total power. The sinusoidal waves for 3 phase system are shown below-

The three phases can be used as single-phase each. So if the load is a single-phase, then one phase can be taken from the three-phase circuit and the neutral can be used as a ground to complete the circuit.

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