# Electrical Terms

## Generation of 3 Phase Power in 3 Phase Circuits

Power in 3 Phase Circuits The three-phase power is mainly used for generation, transmission and distribution of electrical power because of their superiority. It is more economical as compared to single-phase power and requires three live conductors for power supply. Power in a single-phase system or circuit is given by the relation shown below: Where, …

## Circuit Analysis of 3 Phase System – Balanced Condition

The electrical system is of two types i.e., the single-phase system and the three-phase system. The single-phase system has only one phase wire and one return wire thus it is used for low power transmission. The three-phase system has three live wire and one returns the path. The three-phase system is used for transmitting a …

## Delta Connection In a 3 Phase System

In Delta (Δ) or Mesh connection, the finished terminal of one winding is connected to start terminal of the other phase and so on which gives a closed circuit. The three-line conductors are run from the three junctions of the mesh called Line Conductors. The connection in delta form is shown in the figure below: …

## Star Connection in a 3 Phase System

In the Star Connection, the similar ends (either start or finish) of the three windings are connected to a common point called star or neutral point. The three-line conductors run from the remaining three free terminals called line conductors. The wires are carried to the external circuit, giving three-phase, three-wire star connected systems. However, sometimes …

## Parallel Operation of a Single Phase Transformer

Parallel Operation of a Single Phase Transformer means that the two or more transformers having the same polarities, same turn ratios, same phase sequence and the same voltage ratio are connected in parallel with each other. The circuit diagram of two single-phase transformer A and B connected in parallel are shown below: Let, a1 is …

## Parallel Operation of a Transformer

The Transformer is said to be in Parallel Operation when its primary winding is connected to a common voltage supply, and the secondary winding is connected to a common load. The connection diagram of the parallel operation of a transformer is shown in the figure below. The parallel operation of a transformer has some advantages likes …

## Advantages of 3 Phase Over Single Phase System

The three-phase system has three live conductors which supply the 440V to the large consumers. While the single-phase system has one live conductor which is used for domestic purposes. The following are the main advantages of 3 Phase system over Single Phase system. Higher Rating The rating, i.e. the output of a three-phase machine is …

## Polyphase System

Polyphase System is a combination of two or more than two voltages having same magnitude and frequency but displaced from each other by an equal electrical angle. As poly means, many (more than one) and phase means windings or circuits. Each of them has a single alternating voltage of the same magnitude and frequency. The …

## Parallel Resonance

Parallel Resonance means when the circuit current is in phase with the applied voltage of an AC circuit containing an inductor and a capacitor connected together in parallel. Let us understand the Parallel Resonance with the help of a circuit diagram shown below: Consider an Inductor of L Henry having some resistance of R ohms …