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Related Concept Videos

Equivalent Circuits for Practical Transformers01:28

Equivalent Circuits for Practical Transformers

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 winding...
Three-Winding Transformers01:19

Three-Winding Transformers

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...
The Ideal Transformer01:26

The Ideal Transformer

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 component...
Instrument Transformers01:23

Instrument Transformers

Instrument transformers, comprising voltage transformers (VTs) and current transformers (CTs), play crucial roles in power substations by providing isolated replicas of current or voltage for measurement and protection purposes. Voltage transformers reduce the primary voltage to levels suitable for relay operation and measurement, while current transformers scale down the primary current. The primary winding of a current transformer often consists of a single turn, achieved by threading the...
Types Of Transformers01:16

Types Of Transformers

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...
Transformers01:26

Transformers

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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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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A high-voltage pulse transformer with a modular ferrite core.

Z Liu1, G J J Winands, K Yan

  • 1EPS Group, Electrical Department, Technology University of Eindhoven, P.O. Box 513, 5600 MB Eindhoven, The Netherlands. z.liu@tue.nl

The Review of Scientific Instruments
|February 6, 2008
PubMed
Summary
This summary is machine-generated.

A novel modular ferrite core pulse transformer enables efficient high-voltage capacitor charging. This design overcomes air gap challenges, achieving high energy transfer for repetitive resonant charging systems.

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Power Electronics

Background:

  • Repetitive resonant charging systems require high-performance pulse transformers.
  • Modular magnetic cores offer design flexibility but present challenges like air gaps and saturation.

Purpose of the Study:

  • To develop and evaluate a pulse transformer with a modular ferrite core for repetitive resonant charging.
  • To analyze the impact of modular design on core performance and charging efficiency.

Main Methods:

  • Construction of a modular ferrite core transformer (1:80 winding ratio) using 68 ferrite blocks and epoxy resin.
  • Development of an equivalent circuit model to evaluate flux density swing.
  • Experimental validation of the transformer's performance in a resonant charging circuit.

Main Results:

  • Achieved a winding ratio of 1:75.4 with a 99.6% coupling coefficient and 92% energy transfer efficiency.
  • Demonstrated successful charging of capacitors to over 70 kV from 965 V.
  • Core remained unsaturated with a flux density increase of 0.23 T during 26.9 J energy transfer.

Conclusions:

  • The modular ferrite core pulse transformer is effective for high-voltage repetitive resonant charging.
  • The modular design, despite air gaps, performs reliably and efficiently.
  • Core material volume is dependent on coupling coefficient, not primary winding turns, for unsaturated operation.