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Related Concept Videos

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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.
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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.
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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...
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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.
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A gas-insulated mega-ampere-class linear transformer driver with pluggable bricks.

Xiaofeng Jiang1, Fengju Sun2, Zhiguo Wang1

  • 1State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China.

The Review of Scientific Instruments
|December 31, 2020
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Summary

This study details a novel gas-insulated linear transformer driver (LTD) cavity for Z-pinch experiments. The design features pluggable bricks and SF6 gas insulation, successfully delivering a 1 MA current pulse.

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Area of Science:

  • High-energy physics
  • Pulsed power technology

Background:

  • Z-pinch devices require high-current drivers for plasma compression.
  • Existing linear transformer driver (LTD) designs face challenges in scalability and maintenance.

Purpose of the Study:

  • To design and test a novel gas-insulated LTD cavity for the CZ-34 Z-pinch device.
  • To evaluate the performance and feasibility of pluggable brick architecture and SF6 gas insulation.

Main Methods:

  • Construction of a 2290 mm diameter, 346 mm height LTD cavity with 23 main bricks and 1 trigger brick.
  • Utilizing series-connected capacitors and field-distortion/multi-gap gas switches within SF6-filled, pluggable modules.
  • Employing an azimuthal transmission line for synchronous discharge triggering.

Main Results:

  • The LTD cavity delivered a ~1 MA current pulse with an 115 ns rise time into a 0.08 Ω load at ±100 kV charging voltage.
  • Experimental results validated the gas insulation and pluggable brick design.
  • Performance was consistent with circuit simulations and showed minimal change when using return-current rods.

Conclusions:

  • The gas-insulated, pluggable-brick LTD cavity is technically feasible for Z-pinch applications.
  • The charging configuration, triggering method, and isolation resistors were successfully verified.
  • The design offers a new pathway for series LTD cavities, particularly with the use of return-current rods.