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Related Concept Videos

Zones of Protection01:16

Zones of Protection

In power systems, the entire setup is divided into protective zones to isolate faults and protect the rest of the network. These zones include generators, transformers, buses, transmission lines, distribution lines, and motors. Each zone can be visualized as a separate room in a house, with each room protected by its own circuit breaker.
Protective zones are defined by closed dashed lines, containing one or more components. A key characteristic of these zones is the strategic placement of...
Transmission Line Design Considerations01:23

Transmission Line Design Considerations

Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...

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Related Experiment Video

Updated: Jun 22, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

Path protection algorithm with trade-off ability for survivable wavelength-division-multiplexing mesh networks.

Lei Guo, Hongfang Yu, Lemin Li

    Optics Express
    |June 3, 2009
    PubMed
    Summary

    We introduce a new algorithm, resource sharing degree constraints (RSDCs), for survivable wavelength-division multiplexing mesh networks. This method enhances network resilience by intelligently managing backup wavelength assignments based on resource sharing degree.

    Related Experiment Videos

    Last Updated: Jun 22, 2026

    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
    09:43

    Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

    Published on: March 20, 2017

    Area of Science:

    • Telecommunications Engineering
    • Computer Networking
    • Network Reliability

    Background:

    • Wavelength-division multiplexing (WDM) mesh networks are critical for high-capacity data transmission.
    • Ensuring network survivability against failures is a key challenge in WDM networks.
    • Existing path protection algorithms may lack flexibility in resource allocation.

    Purpose of the Study:

    • To introduce a novel path protection algorithm for survivable WDM mesh networks.
    • To enhance resource utilization and protection capabilities through adjustable constraints.
    • To provide a more elastic approach to backup wavelength assignment.

    Main Methods:

    • A new algorithm, resource sharing degree constraints (RSDCs), is proposed.
    • A parameter 'k' is defined to control the resource sharing degree (RSD).
    • Backup wavelengths are assigned dynamically based on the RSD relative to 'k'.

    Main Results:

    • The RSDCs algorithm allows for flexible resource assignment in WDM mesh networks.
    • It effectively manages the trade-off between resource utilization and network protection.
    • The algorithm ensures that the resource sharing degree does not exceed the defined threshold 'k'.

    Conclusions:

    • RSDCs offers an improved approach to path protection in survivable WDM networks.
    • The algorithm provides greater elasticity compared to previous methods.
    • It enables a balanced optimization of network resource efficiency and fault tolerance.