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相关概念视频

Instrument Transformers01:23

Instrument Transformers

416
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...
416
Power System Three-Phase Short Circuits01:21

Power System Three-Phase Short Circuits

495
Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
495
Three-Winding Transformers01:19

Three-Winding Transformers

648
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...
648
Equivalent Circuits for Practical Transformers01:28

Equivalent Circuits for Practical Transformers

1.3K
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...
1.3K
Three-Phase Short Circuit—Unloaded Synchronous Machine01:21

Three-Phase Short Circuit—Unloaded Synchronous Machine

638
Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...
638
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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基于多通道振动信号和视觉特征融合激发干型变压器的故障诊断方法.

Yang Liu1, Mingtao Yu1, Jingang Wang2

  • 1Baihetan Hydropower Plant, China Yangtze Power Co., Ltd., Liangshan 615400, China.

Sensors (Basel, Switzerland)
|December 31, 2025
PubMed
概括

这项研究引入了一种新的,轻量级的故障诊断方法,通过融合多通道振动和视觉数据来激发干型变压器. 该方法达到94%的准确性,提高了关键电气设备的可靠性.

关键词:
在ISDP中,ISDP是指ISDP.一个ORB,一个ORB.激发干型变压器的激发式变压器错误诊断 错误诊断 错误诊断 是一个问题.多通道振动信号多通道振动信号三轴特征聚合三轴特征聚合

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科学领域:

  • 电气工程 电气工程
  • 状态监控 状态监控
  • 机器学习 机器学习

背景情况:

  • 对于激发干型变压器的现有故障诊断方法在多轴振动数据利用,在复杂条件下的准确性和计算效率方面扎.
  • 需要强大高效的方法来确保这些变压器的运行安全和可靠性.

研究的目的:

  • 为激发干型变压器开发一种轻量级故障诊断方法.
  • 提高多通道振动数据的利用率,提高识别精度和计算效率.

主要方法:

  • 开发了一种用于激发干型变压器的多物理场合模拟模型.
  • 扩展了对称点图案 (ISDP) 方法,从多轴振动数据创建二维特征图,使用粒子集群优化 (PSO) 进行优化.
  • 使用面向快速和旋转简报 (ORB) 进行特征提取,并使用适应式提升支持矢量机 (Adaboost-SVM) 进行故障分类.

主要成果:

  • 拟议的方法实现了94.00%的故障诊断准确度,用于典型的故障,如绕线松,核心松和离心率.
  • 在准确性,培训和测试时间方面,超越了现有的信号到图像技术 (GAF,RP,MTF) 和深度学习模型 (CNN).
  • 在重复的试验中证明了卓越的稳定性和强度,适合资源有限的环境.

结论:

  • 轻量级的融合方法有效地解决了现有激发干型变压器故障诊断方法的局限性.
  • 该方法为在线监控和快速诊断提供了强大,高效和准确的解决方案,提高了变压器的安全性和可靠性.