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# Electric Power

It covers articles related to single and three phase power.

## Three-Phase Balanced Load | Delta and Wye Connected Loads

A three-phase load is a set of three exactly similar combinations of electric components arranged in exactly the same way (in series, parallel or other). The reason to have three-phase loads is the higher power demand. For instance, in the industry, the majority of motors are three phase, particularly the …

## Three-Phase System Theory Explained | Star and Delta Connection

The fact that the three waveforms of a three-phase system are 120° apart gives desirable properties to it that makes it attractive from a practical viewpoint.  The very first property of the voltages in the three-phase system is that at each instant of time the sum of all the voltages …

## Voltage Regulator: Working Principle & Circuit Diagram | Voltage Regulator in Power Supply

The output voltage of a power supply will usually decrease when a load is applied. This decrease is not good and needs to be minimized. The size of this decrease is measured in comparison to the no-load voltage. The voltage decrease under load compared to the power supply voltage with …

## Short-Circuit Calculation and Interrupting Capacity

Electrical circuits are designed to allow a limited amount of current to flow through; this is done to prevent overheating of the wires due to I2R losses. The limitation on the current is largely due to the resistance or impedance of the load to which it is connected. Short Circuit …

## Electrical Substation: Types & Components

Power transmission is the moving of electrical energy from the source to the end user. It includes the transmission substation and the distribution substation. The installation of new structures and facilities always raises public concerns that need to be addressed. Moving power is one of the issues accompanying renewable energy …

## Challenges in Smart Grid Implementation

The smart grid is defined as the electrical distribution technology that uses computer-based remote control and automation to improve the delivery efficiency of electricity. In this section, issues with the smart grid implementation are discussed. In the standard grid, information, and energy in the grid travel in one direction: from …

## Power Quality Issues in Renewable Energy Systems

The term power quality is a measure of the purity of the AC power, including the presence of unwanted harmonics and noise on the power line and the frequency. A harmonic is a frequency that is a whole-number multiple of another basic frequency. Harmonics on the power line are multiples of the power line …

## Water Turbines: Types, Applications, History | Impulse and Reaction Turbines

Almost all electrical power is produced with some type of turbine. Water turbines are different than the steam turbines used in most conventional power plants. This section includes a general discussion of water turbines and specific types used for converting hydropower to the mechanical rotating motion. The specific conditions of the …

## DC INVERTER AC TECHNOLOGY

The DC Inverter AC technology is the most recent advancement of innovation concerning the electromotors of the blowers. An Inverter is utilized to control the speed of the blower motor, in order to ceaselessly manage the temperature. The DC inverter units have a variable frequency drive that involves a flexible …

## Three Phase Power Measurement in Three Phase Circuits

Different methods are utilized in order to measure three-phase power in a three-phase circuit. In this particular article, we are going to discuss the following methods in detail: One Wattmeter Method Two Wattmeters Method Three Wattmeters Method A customer of a three-phase electrical service, three-wire or four-wire, will have a …

## Single & Three Phase Grounding

The National Electrical Code (NEC) defines “ground” as  “A conducting connection, whether intentional or accidental, between an electrical circuit or equipment and the earth or to some conducting body that serves in place of the earth.” Single-Phase Grounding The grounding of a typical residential, single-phase service is represented in Figure …

## Grounding Electrical System | Purpose of Grounding Electrical Systems

According to the common practice that was followed years ago, many electrical installations were not grounded. Perhaps the need for adequate grounding was not fully recognized, understood, or considered necessary. Today, electrical grounding is considered important to most, but not all, electrical installations. Yet, the importance of proper electrical grounding …

## Per Unit Calculation | Per Unit System Examples

The per unit (PU or P.U.) method of calculation is often used as an aid in the analysis of electrical systems that operate at different voltage levels. The determination of per unit values is not the end objective of a study. Rather determined per unit values serve to assist in …