Free Expert Guides on Power Systems, Circuit Design & Electrical Troubleshooting

What is a Load Curve?Load Curve A load curve is defined as a graph that shows how energy demand varies over time from a power source.If the curve covers 24 hours, it is called a daily load curve. For a week, month, or year, it is called the weekly, monthly, or yearly load curve.The load duration curve reflects the activity of a population quite accurately with respect to electrical power consumption over a given period of time. To understand the concept better its important that we take the real

Auto Reclosing Scheme of Transmission System

What is Electrical Grid System ?Electrical Grid System DefinitionAn electrical grid system is defined as a network connecting multiple power-generating stations at a specific transmission voltage level. Increased ReliabilityAn interconnected grid boosts the reliability of the power system by sharing loads in case of generating station failures.Load SharingThe grid system can exchange peak loads, reducing the need for partial load shedding or increasing the generating station’s capacity.Use of In

Auto Reclosing DefinitionAn auto reclosing scheme is defined as a system that automatically attempts to close circuit breakers after a fault, restoring power without human intervention. Fault Types Transient Fault Semi Permanent Fault Permanent Fault Auto Recloser Working PrincipleThe extra high voltage transmission lines transmit huge amount of electric power. Hence, it is always desirable that the continuation of power flow through the lines should not be interrupted for a long time. There may

Electrical Supply System DefinitionAn electrical supply system is defined as the network delivering electricity from generating stations to consumers, including transmission and distribution.In the past, the demand for electrical energy was low, and a single small generating unit could meet the local needs. Now, with modern lifestyles, the demand has skyrocketed. To meet this growing demand, we need many large power plants.However, building power plants near load centers, where many consumers ar

What are Power Transmission Systems?Power Transmission Systems DefinitionPower transmission systems transmit electrical power from generating stations to load centers where it is consumed.Electric power transmission systems are the means of transmitting power from a generating source to various load centers (i.e. where the power is being used). Generating stations generate electrical power. These generating stations are not necessarily situated where the majority of the power is being consumed (

Skin Effect DefinedSkin effect in transmission lines is the phenomenon where AC current concentrates near the conductor’s surface, increasing its effective resistance.Skin effect is defined as the tendency of an AC current to distribute unevenly over the cross-section of a conductor, such that the current density is highest near the surface of the skin of the conductor and decreases exponentially towards the core. This means that the inner part of the conductor carries less current than the oute

What is Long Transmission Line?Definition of Long Transmission LineA long transmission line is defined as a transmission line longer than 250 km (150 miles), which needs a different modeling approach.A long transmission line is defined as a transmission line with a length greater than 250 km (150 miles). Unlike short transmission lines and medium transmission lines, long transmission lines need detailed modeling of their distributed parameters along the entire length. This makes calculating the

Medium Transmission Line DefinitionA medium transmission line is defined as a transmission line with a length between 80 km (50 miles) and 250 km (150 miles).A medium transmission line is defined as a transmission line with an effective length more than 80 km (50 miles) but less than 250 km (150 miles). Unlike a short transmission line, the line charging current of a medium transmission line is appreciable and hence the shunt capacitance must be considered (this is also the case for long transmi

Short Transmission Line DefinitionA short transmission line is defined as a transmission line less than 80 km (50 miles) long or with a voltage less than 69 kV.A short transmission line is defined as a transmission line with an effective length less than 80 km (50 miles), or with a voltage less than 69 kV. Unlike medium transmission lines and long transmission lines, the line charging current is negligible, and hence the shunt capacitance can be ignored.For short length, the shunt capacitance of