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Related Concept Videos

Directional Relays01:25

Directional Relays

584
Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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Overcurrent Relays01:26

Overcurrent Relays

502
Overcurrent relays, crucial for circuit protection, are connected to the secondary current of a current transformer. There are two primary types of overcurrent relays: instantaneous and time-delay.
Instantaneous overcurrent relays activate immediately when the input current exceeds a predetermined value, known as the pickup current, instantly energizing the circuit breaker trip coil. This rapid response is vital for addressing severe faults quickly.
Time-delay overcurrent relays, on the other...
502
Differential Relays01:20

Differential Relays

744
Differential relays are used to protect generators, buses, and transformers by comparing electrical quantities at different points. When a fault occurs, the difference in current between the two points triggers the relay to operate, opening the circuit breaker. Under normal conditions, the current entering (i1) and leaving (i2) a generator are equal. When a fault occurs, however, these currents become unequal, and the difference current flows in the relay operating coil, causing the relay to...
744
Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

443
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...
443
Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

483
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:
483
Diencephalon: Thalamus and Information Relay01:27

Diencephalon: Thalamus and Information Relay

4.0K
The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological...
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Gyroid structured aqua-sheets with sub-nanometer thickness enabling 3D fast proton relay conduction.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electrochemistry

Background:

  • Development of advanced materials for energy applications requires precise control over nanostructure and ion transport properties.
  • Zwitterionic compounds offer unique hydration capabilities, crucial for developing proton-conductive materials.
  • Liquid-crystalline phases provide a template for creating ordered nanostructures in polymers.

Purpose of the Study:

  • To design and synthesize a polymerizable amphiphile capable of forming a gyroid bicontinuous cubic liquid-crystalline phase.
  • To investigate the in situ polymerization of this phase into a self-standing nanostructured polymer film.
  • To evaluate the proton conductivity of the resulting polymer film under varying hydration conditions.

Main Methods:

  • Design and synthesis of a polymerizable amphiphile with dual zwitterionic head-groups.
  • Co-organization with bis(trifluoromethanesulfonyl)imide (HTf2N) to form a gyroid liquid-crystalline phase.
  • In situ UV polymerization to yield a gyroid-nanostructured polymer film.
  • Water absorption studies and analysis of nanostructure preservation.
  • Proton conductivity measurements at different relative humidity levels.

Main Results:

  • Successful formation of a self-standing gyroid-nanostructured polymer film via in situ polymerization.
  • The polymer film preserves its gyroid nanostructure upon water absorption, forming a 3D continuous water network.
  • High ionic conductivities (10-1 S cm-1) were achieved at 15.6 wt% water content (RH = 90%).

Conclusions:

  • The designed polymer film effectively templats a gyroid nanostructure, enabling efficient proton conduction.
  • The absorbed water molecules form a continuous network facilitating proton transport via the Grotthuss mechanism.
  • This material shows significant potential for applications requiring high proton conductivity, such as fuel cells and batteries.