Results 51 to 60 of about 14,778 (170)

A novel artificial neural network approach for residual life estimation of paper insulation in oil‐immersed power transformers

IET Electric Power Applications
Avoiding financial losses requires preventing catastrophic oil‐filled power transformer breakdowns. Continuous online transformer monitoring is needed.
Md. Manzar Nezami, Md. Danish Equbal, Md. Fahim Ansari, Majed A. Alotaibi, Hasmat Malik, Fausto Pedro García Márquez, Mohammad Asef Hossaini   +6 more
doaj   +1 more source

Aging monitoring of electrical machines using winding high frequency equivalent circuits

Open Physics, 2019
This study defines a monitoring method based on impedance analysis in the upper part of the spectrum. It focuses on the analysis of the high frequency behavior of electrical machines windings considering the turn-to-turn capacitance variations (delta-C ...
Ait-Amar Sonia, Roger Daniel, Savin Serghei   +2 more
doaj   +1 more source

Ground fault insulation monitoring method for smart substation based on Mahalanobis distance and automatic code generation

Energy Informatics
The existence of a ring network significantly increases the proportion of harmonic components in the DC system branch current, correspondingly diminishing the low-frequency components, resulting in a decrease in signal-to-noise ratio and negatively ...
Xiang Li, Haopeng Shi, Ke Yang, Qiyan Dou, Najuan Jia   +4 more
doaj   +1 more source

Aging Evaluation of Transformer Oil-Paper Insulation Using Partial Discharge Patterns and Clustering Methods

IEEE Access
This paper presents an analysis of the aging of oil-paper insulation using partial discharge (PD) patterns and clustering methods. The four-quadrant model of partial discharge patterns is employed.
Ming-Shou Su, Yu-Hsun Lin, Chun-Lung Yi, Jiann-Fuh Chen, Chien-Hsiung Wang   +4 more
doaj   +1 more source

Temperature Estimation Method on Optic–Electric Composite Submarine Power Cable Based on Optical Fiber Distributed Sensing

Photonics
The status of an optic–electric composite high-voltage submarine cable (referred to as submarine cable) can be monitored based on optical fiber-distributed sensing technology, and at the same time, no additional sensor is needed in the monitoring system.
Chao Luo, Zhitao Feng, Yihua Zhu, Yuyan Liu, Yi Zhang, Ying Zhou, Muning Zhang, Lijuan Zhao   +7 more
doaj   +1 more source

Degradation Mechanism and Online Electrical Monitoring Techniques of Stator Winding Insulation in Inverter-Fed Machines: A Review

World Electric Vehicle Journal
Inverter-fed machines are widely used in electric vehicle drive systems and have shown a trend toward high voltage and frequency in recent years. They are subjected to multiple types of stress during operation, causing potential short-circuit fault ...
Zihan Zou, Senyi Liu, Jinsong Kang
doaj   +1 more source

Multi-Parameter Assessment and Validation of Cable Insulation Using Game Theory and Fuzzy Comprehensive Evaluation

Energies
Accurate assessment of high-voltage cable insulation condition is essential for safe operation in complex tunnel environments. Traditional methods relying on single diagnostic indicators and fixed weighting schemes often suffer from limited accuracy and ...
Qianqiu Shao, Songhai Fan, Zongxi Zhang, Fenglian Liu, Jinkui Lu, Zhengzheng Fu, Pinlei Lv   +6 more
doaj   +1 more source

A Study on Insulation Monitoring Technology of High-Voltage Cables in Underground Coal Mines Based on Decision Tree.

Comput Intell Neurosci, 2022
Fu W, Xu Y, Gao Y.
europepmc   +1 more source

Insulation Online Monitoring Method for Dry-Type Current Transformers Based on Virtual Voltage

Energies
To improve the accuracy of insulation state online monitoring for capacitive dry-type current transformers (CTs) and to address the limitations of traditional methods relying on potential transformer (PT) voltage signals and reference devices, a virtual ...
Junjie Zhang, Yu Peng, Xiaohui Hu, Zhipeng Li, Li Yan, Can Ding, Ruihua Zhao   +6 more
doaj   +1 more source

Improved Condition Monitoring of Composite Insulators

, 2012
Although the cost of investment in power lines insulators is 3 - 5% of the total cost of the installation, the impact of their performance on reliability, failure costs, maintenance routines, etc in power systems is tens of times higher. Composite insulators were introduced 50 years ago and have been used around the world with consistently good ...
openaire   +1 more source