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Related Concept Videos

Toroids01:27

Toroids

4.3K
A toroid is a closely wound donut-shaped coil constructed using a single  conducting wire. In general, it is assumed that a toriod consists of  multiple circular loops perpendicular to its axis.
When connected to a supply, the magnetic field generated in the toroid has field lines circular and concentric to its axis. Conventionally, the direction of this magnetic field is expressed using the right-hand rule. If the fingers of the right hand curl in the current direction, the thumb points in...
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Differential Relays01:20

Differential Relays

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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...
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Overcurrent Relays01:26

Overcurrent Relays

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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...
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Directional Relays01:25

Directional Relays

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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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Faraday Disk Dynamo01:23

Faraday Disk Dynamo

4.1K
A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Solenoids01:17

Solenoids

3.7K
A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field for a solenoid is the vector sum of the magnetic field due to its individual turns. For an ideal solenoid, the magnetic field inside is almost uniform and parallel to the solenoid axis, while the magnetic field outside the solenoid is nearly zero.
Each turn in a solenoid can be approximated as a circular current carrying coil that generates a dipole moment. The...
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Solar concentrator with a toroidal relay module.

Jhe-Syuan Lin, Chao-Wen Liang

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    Summary
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    This study presents a novel solar concentrator design for III-V multijunction solar cells. The innovative toroidal relay module achieves a high concentration ratio and efficiency, reducing costs for solar energy transformation.

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    Area of Science:

    • Renewable Energy Engineering
    • Optical Engineering
    • Materials Science

    Background:

    • III-V multijunction solar cells demand high-performance solar concentrators to lower costs and enhance efficiency.
    • Existing concentrator designs face limitations in concentration ratio, efficiency, and acceptance angle.

    Purpose of the Study:

    • To introduce a novel solar concentrator design with a high concentration ratio, high transfer efficiency, thin profile, and wide solar acceptance angle.
    • To detail the optical design utilizing a toroidal relay module for improved solar energy capture and conversion.

    Main Methods:

    • The optical design employs a single, concentric toroidal lens integrating off-axis relay and field lens functionalities.
    • Simulations were conducted to evaluate the concentrator's performance characteristics.

    Main Results:

    • The exemplary design achieved a high average optical concentration ratio of 1230×.
    • A maximum efficiency of 76.8% and a solar acceptance angle of ±0.9° were recorded.
    • The design features a notable aspect ratio of 0.24.

    Conclusions:

    • The novel toroidal relay module design offers a promising solution for high-concentration solar energy applications.
    • This design can significantly contribute to reducing the per-watt cost and increasing the efficiency of III-V multijunction solar cells.