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Related Concept Videos

Three-Winding Transformers01:19

Three-Winding Transformers

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Three identical single-phase transformers can be configured to form a three-phase transformer connection, which involves high-voltage and low-voltage windings. The high-voltage windings are denoted by capital letters A-B-C, while the low-voltage windings are labeled with lowercase letters a-b-c, representing their respective phases. This notation helps distinguish between the high and low voltage sides of the transformer.
In the per-unit equivalent circuit of a grounded Y-Y three-phase...
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Equivalent Circuits for Practical Transformers01:28

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The practical equivalent circuits of single-phase two-winding transformers exhibit significant deviations from their idealized versions due to the inherent properties of winding resistance and finite core permeability. These properties result in real and reactive power losses, affecting the transformer's performance. Understanding these deviations is crucial for designing more efficient transformers.
In a practical transformer, each winding exhibits resistance and leakage reactance. The...
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Types Of Transformers01:16

Types Of Transformers

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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.
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Transformers01:26

Transformers

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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...
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The Ideal Transformer01:26

The Ideal Transformer

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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.
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Reducing Line Loss01:18

Reducing Line Loss

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In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
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Development of a five-stage solid-state linear transformer driver.

Li-Min Wang1, Zheng-Quan Zhang1, Qing-Xiang Liu1

  • 1School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China.

The Review of Scientific Instruments
|October 2, 2020
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Summary
This summary is machine-generated.

A new five-stage solid-state linear transformer driver (LTD) was developed, offering long life and fast pulse rise times. This technology is paving the way for advanced high-power microwave sources.

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Area of Science:

  • Electrical Engineering
  • Pulsed Power Technology

Background:

  • Solid-state power electronics are crucial for advanced applications.
  • Linear Transformer Drivers (LTDs) are essential components in pulsed power systems.

Purpose of the Study:

  • To develop and characterize a novel five-stage solid-state linear transformer driver (LTD).
  • To improve pulse quality and reliability for high-power applications.

Main Methods:

  • Design and construction of a five-stage LTD utilizing compact pulse generating modules.
  • Incorporation of multilayer-ceramic-capacitor-based pulse-forming networks (PFNs) with insulated-gate bipolar transistor (IGBT) switch arrays.
  • Implementation of magnetic switches for pulse front enhancement and reverse voltage absorption circuits for IGBT protection.

Main Results:

  • The developed five-stage LTD demonstrates long life, low jitter, and a fast rising edge.
  • The device successfully delivers a 35 kV, 119 ns, 4.3 kA square pulse train at up to 50 Hz.
  • A larger cross-sectional core was adopted, improving output characteristics.

Conclusions:

  • The five-stage LTD represents a significant advancement in solid-state pulsed power drivers.
  • The successful development provides a foundation for scaling to higher voltage systems, such as a 50-stage LTD for high-power microwave sources.