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相关概念视频

Instrument Transformers01:23

Instrument Transformers

76
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...
76
Relation of DFT to z-Transform01:20

Relation of DFT to z-Transform

369
The Discrete Fourier Transform (DFT) is a crucial tool for analyzing the frequency content of discrete-time signals. It converts a sequence of N samples from the time domain into its corresponding sequence in the frequency domain, where each sample represents a specific frequency component.
To understand how the DFT works, it's helpful to consider the z-transform, which is a method for representing discrete sequences in the complex frequency domain. The z-transform involves summing the...
369
Equivalent Circuits for Practical Transformers01:28

Equivalent Circuits for Practical Transformers

401
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...
401
Energy Losses in Transformers01:21

Energy Losses in Transformers

843
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...
843
Discrete Fourier Transform01:15

Discrete Fourier Transform

228
The Discrete Fourier Transform (DFT) is a fundamental tool in signal processing, extending the discrete-time Fourier transform by evaluating discrete signals at uniformly spaced frequency intervals. This transformation converts a finite sequence of time-domain samples into frequency components, each representing complex sinusoids ordered by frequency. The DFT translates these sequences into the frequency domain, effectively indicating the magnitude and phase of each frequency component present...
228
Differential Relays01:20

Differential Relays

117
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...
117

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基于TMO-ZnO异质连接的传感器用于变压器缺陷检测:DFT研究

Jingyi Yan1, Weiju Dai1, Dexu Zou1

  • 1Electric Power Research Institute of Yunnan Power Grid, Kunming 650214, China.

Nanomaterials (Basel, Switzerland)
|June 11, 2025
PubMed
概括

过渡金属氧化物-ZnO异质连接传感器显示了对H2,CO和C2H4的增强气体传感. 这些传感器提高了选择性,抗毒,帮助检测变压器缺陷.

关键词:
密度函数理论密度函数理论溶解的气体是溶解的气体.能源效率分析 能源效率分析金属氧化物异质连接的异质连接.变压器缺陷检测检测 变压器缺陷检测

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科学领域:

  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.
  • 传感器技术 传感器技术

背景情况:

  • 在气体传感应用中探索过渡金属氧化物 (TMO) -ZnO异质连接.
  • 提高传感器的选择性和抗毒性对于实际的气体检测至关重要.

研究的目的:

  • 分析TMO-ZnO异质连接传感器对 (H2),一氧化碳 (CO) 和乙烯 (C2H4) 的气体吸附和传感性能.
  • 调查不同TMO (CuO,Ag2O,Cu2O) 对传感器性能和稳定性的影响.

主要方法:

  • 在TMO-ZnO异质连接上对气体吸附的计算分析.
  • 评估气体传感性能和对目标气体的选择性.
  • 通过吸附过程模拟来评估传感器中毒抗性.

主要成果:

  • CuO,Ag2O和Cu2O与ZnO形成稳定的异质连接,提高了传感器的性能.
  • CuO-ZnO对H2具有物理吸附性,对CO和C2H4具有良好的感知能力.
  • Ag2O-ZnO和Cu2O-ZnO对H2,CO和C2H4显示出显著的反应.
  • 由于气体吸附过程中的结构稳定性,TMO-ZnO异质连接有效防止传感器中毒.

结论:

  • TMO-ZnO异质连接为H2,CO和C2,H4提供了改进的气体传感能力和选择性.
  • 异质连接的结构完整性确保了对传感器中毒的抵抗力.
  • 这项研究为开发用于变压器缺陷监测和能源效率分析的TMO-ZnO传感器提供了理论基础.