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Related Concept Videos

Secondary Distribution01:25

Secondary Distribution

623
Secondary distribution systems provide electrical energy at the utilization voltage levels from distribution transformers to customer meters. Typical secondary voltages in the United States include 120/240 V for residential use, 208Y/120 V for residential and commercial use, and 480Y/277 V for industrial and high-rise commercial use.
In residential areas, 120/240 V single-phase, three-wire service is commonly used for lighting, outlets, and large appliances. Urban areas with high-density loads...
623
Power System Distribution01:25

Power System Distribution

1.2K
Power system distribution involves delivering electrical energy from power plants to consumers through a network of transmission and distribution systems. The process begins at power plants, where energy from coal, gas, nuclear, water, and wind is converted into electrical energy. These plants use three-phase generators, typically rated between 50 to 1300 MVA, with terminal voltages ranging from a few kV to 20 kV, depending on the size and age of the units.
The transmission system is designed...
1.2K
Primary Distribution01:28

Primary Distribution

620
Primary distribution systems deliver electrical power from substations to consumers through various voltage classes, with 15-kV class voltages being predominant among U.S. utilities. Older 2.5- and 5-kV classes are being replaced by 15-kV primaries, while higher 25- to 34.5-kV classes are used in high-density urban areas and rural regions with long feeders. Three-phase, four-wire multigrounded systems are widely employed for balanced power delivery, using the neutral wire as a grounding point.
620
Transformers in Distribution System01:27

Transformers in Distribution System

557
Transformers in distribution systems can be broadly categorized into distribution substation transformers and other distribution transformers. They are crucial for stepping down high transmission voltages to levels suitable for distribution and end-user applications.
Distribution substation transformers come in various ratings and typically use mineral oil for insulation and cooling. To prevent moisture and air from entering the oil, some transformers use an inert gas like nitrogen to fill the...
557
Maximum Power Flow and Line Loadability01:23

Maximum Power Flow and Line Loadability

694
The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
694
Control of Power Flow01:30

Control of Power Flow

734
There are several methods to control power flow in power systems:
734

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Related Experiment Videos

Global Electricity Trade Network: Structures and Implications.

Ling Ji1, Xiaoping Jia2, Anthony S F Chiu3

  • 1School of Economics and Management, Beijing University of Technology, Beijing, China.

Plos One
|August 10, 2016
PubMed
Summary
This summary is machine-generated.

Nations trading electricity form a global network. Key countries like Russia and China hold central positions, influencing grid reliability. This trade also increases CO2 emissions.

Related Experiment Videos

Area of Science:

  • Network Science
  • International Relations
  • Energy Systems Analysis

Background:

  • Nations increasingly engage in international electricity trade.
  • Understanding the global power grid's structure is crucial for its reliability.
  • The global electricity trade network's architecture influences energy security and stability.

Purpose of the Study:

  • To analyze the structure of the global electricity trade network.
  • To identify critical nations for grid reliability based on network centrality.
  • To investigate community structures and their relation to geographical proximity within the Eurasian sub-network.

Main Methods:

  • Network analysis of international electricity trade data.
  • Identification of nodes (nations) and links (trade flows).
  • Calculation of betweenness centrality to determine critical nodes.

Main Results:

  • The global electricity trade network comprises four distinct sub-networks.
  • Russia, China, Ukraine, and Azerbaijan exhibit high centrality in the Eurasian sub-network.
  • The Eurasian sub-network consists of seven communities, not strictly aligned with geography.
  • International electricity trade in Eurasia contributes to approximately 11 million tons of additional CO2 emissions.

Conclusions:

  • Certain nations hold pivotal roles in the global electricity trade network, impacting its overall reliability.
  • The structure of electricity trade communities deviates from simple geographical clustering.
  • Current international electricity trade practices in Eurasia have significant environmental implications due to associated CO2 emissions.