# Electrical Terms

## Single Line Diagram of 11kV Substation

Substation provides the energy supply for the local area in which the line is located. The main function of the substation is to collect the energy transmitted at high voltage from the generating station and then reduce the voltage to an appropriate value for local distribution and gives facilities for switching. The substation is of …

## Sequence Networks

Definition: The sequence impedance network is defined as a balance equivalent network for the balance power system under an imagined working condition so that only single sequence component of voltage and current is present in the system. The symmetrical components are useful for computing the unsymmetrical fault at different points of a power system network. …

## Regulating Transformer

Definition: The transformer which changes the magnitude and phase angle at the certain point in the power system is known as the regulating transformer. It is mainly used for controlling the magnitude of bus voltage and for controlling the power flow, which is controlled by the phase angle of the transformer. They provide the small …

## Summation Current Transformer

Definition: The transformer which is used for converting the three-phase quantities into the single phase quantity is known as the summation transformer. This transformer is mainly employed for the unbalanced condition in the system and due to fault condition so that the relay operates properly. The connection of the summation current transformer is shown in …

## Classification of Transmission Lines

The classification of the transmission lines depends on its voltage and the length of the conductor. The transmission line is the medium of transferring the power from the generating station to the load centre. It is mainly classified into two types. They are the AC Transmission Line Short-Transmission Line Medium Transmission Line Pi Model of …

## Line Regulation

Definition: The voltage or line regulation is defined as the variation in the voltage at the receiving end of the line when the full load at a given power factor is removed and the voltage at the sending end being kept constant.  In other words, it is defined as the percentage variation in voltage at …

Definition: The device which takes electrical energy is known as the electric load. In other words, the electrical load is a device that consumes electrical energy in the form of the current and transforms it into other forms like heat, light, work, etc. The electrical load may be resistive, inductive, capacitive or some combination between …

## Types of Faults in Power System

The fault in the power system is defined as the defect in the power system due to which the current is distracted from the intended path. The fault creates the abnormal condition which reduces the insulation strength between the conductors. The reduction in insulation causes excessive damage to the system. The fault in the power system is …

## Three Phase System

Definition: The system which has three phases, i.e., the current will pass through the three wires, and there will be one neutral wire for passing the fault current to the earth is known as the three phase system. In other words, the system which uses three wires for generation, transmission and distribution is known as …

## Ungrounded System

Definition: The system without neutral grounding is known as the ungrounded system, or in other words, in the ungrounded system, none of their conductors is connected to the ground. The main feature of the ungrounded system is its ability to remove the earth faults without interruption. But the self-cleaning process of the ungrounded system become …