English
RFQ

Download the app

What is a Transmission Lines?

08/30/2024

What is a Transmission Lines?

Transmission Line Definition

A transmission line is a designed conductor that carries large volumes of electrical power across large distances at high voltages.

Line Types and Lengths

Transmission lines are categorized by length; short lines are under 80 km, medium lines between 80 and 250 km, and long lines over 250 km.

Efficiency Explained

Transmission line efficiency is the ratio of power received to power sent, indicating how much power reaches its destination versus how much is sent.

cosθs is the sending end power factor.

cosθR is the receiving end power factor.

Vs is the sending end voltage per phase.

VR is the receiving end voltage per phase.

Voltage Regulation

Voltage Regulation Defined: Voltage regulation in a transmission line is the percentage difference in voltage between the sending and receiving ends under varying load conditions.

Where, Vs is the sending end voltage per phase and VR is the receiving end voltage per phase.

XL is the reactance per phase.

R is the resistance per phase.

cosθR is the receiving end power factor.

Effect of load power factor on regulation of transmission line:

For lagging load

For leading load

Power factor is lagging or unity, and then VR is increased and goes to be positive.

Power factor is leading, and then VR is decreased and goes to be negative.

Capacitance in Transmission Lines

In longer transmission lines, the effect of capacitance is significant and must be modeled correctly to ensure accuracy in power transmission.

Topics

Power Systems Transmission Lines Parameters、Types 、 Theory

The Electricity Encyclopedia is dedicated to accelerating the dissemination and application of electricity knowledge and adding impetus to the development and innovation of the electricity industry.

Ensuring Reliability: A Deep Dive into Transformer Maintenance

Ensuring Reliability: A Deep Dive into Transformer Maintenance

IntroductionElectric transformers are the backbone of modern power distribution systems, silently enabling the reliable delivery of electricity to homes, businesses, and industries. As these critical assets age and the demand for uninterrupted power grows, the importance of diligent transformer maintenance has never been greater. This essay explores the essential role of transformer maintenance, highlighting the value of proactive care, the impact of advanced diagnostic technologies, and the tra

How does a transformer work?

How does a transformer work?

Transformer Operation PrincipleA transformer is an electrical device that operates on the principle of electromagnetic induction to transfer electrical energy from one circuit to another. It enables the adjustment of voltage levels within an alternating current (AC) system, either stepping up (increasing) or stepping down (decreasing) voltage while maintaining the same frequency.Working Principle:Basic ComponentsA transformer consists of two coils, known as windings—the "primary winding" connect

What is the difference between a dielectric and an insulator?

What is the difference between a dielectric and an insulator?

Dielectrics and insulators are distinguished primarily by their applications. One of the main differences is that a dielectric can store electrical energy by becoming polarized in an electric field, whereas an insulator resists the flow of electrons to prevent current conduction. Other key differences between them are outlined in the comparison chart below.Definition of DielectricA dielectric material is a type of insulator that contains few or no free electrons. When subjected to an electric fi

Transformer Connection Sections

Transformer Connection Sections

Transformer Connection DesignationsThe transformer connection designation indicates the winding connection method and the phase relationship between the line voltages of the primary and secondary windings. It consists of two parts: letters and a number. The letters on the left denote the connection configurations of the high-voltage and low-voltage windings, while the number on the right is an integer from 0 to 11.This number represents the phase shift of the low-voltage winding's line voltage r

Source professional electrical partners, experts, and explore smart grid & energy solutions.