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相关概念视频

Types Of Transformers01:16

Types Of Transformers

1.4K
Transformers can provide desired voltages to a circuit by modifying the number of turns in the secondary windings.
If the ratio of the number of turns in the secondary winding to that of the primary winding is greater than one, then the transformer is said to be a step-up transformer. In a step-up transformer, the voltage at the secondary winding is greater than the voltage applied at the primary winding.
However, if this ratio is less than one, the transformer is said to be a step-down...
1.4K
Transformers with Off-Nominal Turns Ratios01:25

Transformers with Off-Nominal Turns Ratios

511
In scenarios involving parallel transformers with disparate ratings, developing per-unit models requires accommodating off-nominal turns ratios. This situation arises when the selected base voltages are not proportional to the transformer’s voltage ratings. Consider a transformer where the rated voltages are related by the term a. If the chosen voltage bases satisfy a relationship involving term b, term c is defined as the ratio of these bases. This ratio is then substituted into the...
511
Transformers01:26

Transformers

1.7K
A device that transforms voltages from one value to another using induction is called a transformer. A transformer consists of two separate coils, or windings, wrapped around the same soft iron core. However, they are electrically insulated from each other.
The iron core has a substantial relative permeability. Therefore, the magnetic field lines generated due to the current in one winding are almost entirely confined within the core, such that the same magnetic flux permeates each turn of both...
1.7K
Transformers in Distribution System01:27

Transformers in Distribution System

491
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...
491
The Ideal Transformer01:26

The Ideal Transformer

1.4K
In single-phase two-winding transformers, two windings are coiled around a magnetic core characterized by cross-sectional area A and magnetic permeability μ. A phasor current i1 enters the left winding while i2 exits the right winding, establishing the fundamental working of the transformer through electromagnetic principles.
Ampere's Law forms the basis of understanding the magnetic field within the transformer. It states that the integral of the magnetic field intensity's tangential...
1.4K
Energy Losses in Transformers01:21

Energy Losses in Transformers

1.3K
In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary winding. However, in reality,  the transformers always have some energy losses, and, hence, the output power obtained at the secondary winding is less than the input power at the primary winding due to energy losses.
There are four main reasons for energy losses in transformers.
The first cause can be  the high resistance of the...
1.3K

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相关实验视频

Updated: Jan 14, 2026

A Swin Transformer-Based Model for Thyroid Nodule Detection in Ultrasound Images
04:23

A Swin Transformer-Based Model for Thyroid Nodule Detection in Ultrasound Images

Published on: April 21, 2023

2.3K

图形变压器:一项调查

Ahsan Shehzad, Feng Xia, Shagufta Abid

    IEEE transactions on neural networks and learning systems
    |January 12, 2026
    PubMed
    概括
    此摘要是机器生成的。

    图形变压器结合了图形学习和变压器模型,在图形数据上提供了强大的性能. 这项调查回顾了他们在机器学习方面的进展,设计,应用和挑战.

    相关实验视频

    Last Updated: Jan 14, 2026

    A Swin Transformer-Based Model for Thyroid Nodule Detection in Ultrasound Images
    04:23

    A Swin Transformer-Based Model for Thyroid Nodule Detection in Ultrasound Images

    Published on: April 21, 2023

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    科学领域:

    • 机器学习 机器学习
    • 人工智能的人工智能
    • 图形理论 图形理论

    背景情况:

    • 图形结构数据在许多领域普遍存在.
    • 传统模型难以处理复杂的图形关系.
    • 变压器擅长序列建模,但需要适应图形.

    研究的目的:

    • 为了提供对图形变压器的全面审查.
    • 分析设计原则和图形特征的整合.
    • 将现有的图形变压器模型分类并确定未来的研究方向.

    主要方法:

    • 对图形学习和变压器中的基本概念的审查.
    • 分析建筑设计的整合图表的诱导偏差和注意力.
    • 开发一个分类系统来分类图形变压器.
    • 讨论应用和挑战.

    主要成果:

    • 图形变压器在节点,边缘和图形层次任务中表现出强的性能.
    • 关键的设计考虑包括诱导偏见和注意力机制.
    • 提出了一个基于深度,可扩展性和预训练的分类法.
    • 确定的挑战包括可扩展性,稳定性和可解释性.

    结论:

    • 图形变压器代表了图形数据机器学习的重大进步.
    • 需要进一步的研究来解决可扩展性,概括性和可解释性方面的挑战.
    • 该领域对各种应用具有巨大的潜力.