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eng Vibration measurement based condition monitoring
Zhang, Fan; Ji, Shengchang; Shi, Yuhang; Ma, Hui
Transformers Magazine Vol. 7, No. 5, 2020
Vibrations of the transformers are complex multi-physics phenomena that require a deep understanding of electromagnetic and mechanical principles. Their analysis can be used to assess the condition of the transformer in terms of mechanical fixation quality, buckling or ageing of the components. The article presents the 20 years of efforts of researchers in Xi'an Jiaotong University and The University of Queensland on transformer vibration characteristics and its application in the winding mechanical condition monitoring.
Hrčak ID: 249598

eng Diagnosis of the wear of gears in the gearbox using the wavelet packet transform
Figlus, T.; Stańczyk, M.
Metalurgija Vol. 53, No. 4, 2014
The paper presents research aimed at diagnosing early cases of wear of gears tooth surface in the gearbox based on measurements of vibration signals and their processing using the wavelet packet transform. Analysis concerned the vibration signals recorded in a test bench experiment, during which the wear of gears teeth increased (pitting and spalling). The studies allow conclusions to be drawn that the processing of vibration signals using the wavelet packet transform allows the detection of early cases of wear of the working surface of the tee...
Hrčak ID: 122219

eng Condition monitoring: Situational awareness brought to you by IoT
Sparling, Brian
Transformers Magazine Vol. 6, No. 2, 2019
Increased technology, such as the Internet of Things (IoT), does not increase situation awareness itself. However, technology will help reduce the impact of the situational awareness barriers and improve decision making when used as it was intended [1]. We can become mesmerized by technology that can be held in our hands to communicate, learn, and entertain to the point of distraction, and miss altogether the context that the medium is trying to convey. With this in mind, and from my experience, comes real life observations of good intentions g...
Hrčak ID: 218837

eng A method for detecting damage to rolling bearings in toothed gears of processing lines
Figlus, T.; Stańczyk, M.
Metalurgija Vol. 55, No. 1, 2016
This paper presents a method of diagnosing damage to rolling bearings in toothed gears of processing lines. The research has shown the usefulness of vibration signal measurements performed with a laser vibrometer and of the method of denoising signals by means of a discrete wavelet transform in detecting damage to bearings. The application of the method of analysis of the characteristic frequencies of changes in the vibration signal amplitude made it possible to draw conclusions about the type of damage to the bearings.
Hrčak ID: 141840

eng Effective bushing monitoring: A technical guide to avoiding failure and making critical decisions
McGrail, Tony
Transformers Magazine Vol. 4, No. 5, 2017
Bushing monitoring is an important component of an effective condition monitoring program. Bushings play an important background role in the smooth operation of the power grid, but they are not perfect, and allow for some current to reach the ground: this is called the bushing leakage current. The right monitoring tools and strategy can help record the magnitude and phase of the bushing leakage current and capture information about the state of bushing insulation. This article will address why and how bushing failure occurs and the steps compan...
Hrčak ID: 195044

eng On-line monitoring of HV substation equipment: Myths and truths
Sparling, Brian
Transformers Magazine Vol. 4, No. 2, 2017
This article discusses myths and truths around unrelenting challenges faced by substation owners over the past years to improve the service to the customer base, and presents a case of a utility which implemented a large-scale monitoring system involving 300 transformers, and achieved a number of transformer and bushing failure saves and capital deferrals.
Hrčak ID: 179586

eng Brief Review of Vibration Based Machine Condition Monitoring
Miljković, Dubravko
HDKBR INFO Magazin Vol. 5, No. 2, 2015
In the process of channeling energy into job to be performed all machines vibrate. Machines rarely break down without giving some previous warning. The signs of impeding failure are generally present long before a machine totally breaks down. When faults begin to develop in the machine, some of dynamic processes in the machine are changed as well, thereby influencing machine vibration level, temporal and spectral vibration properties. Such changes can act as an indicator for early detection and identification of developing faults. This paper br...
Hrčak ID: 158479

eng Wireless Condition Monitoring of Machinery and Equipment in Maritime Industry: An Overview
Panić, Ivan; Ćelić, Jasmin; Cuculić, Aleksandar
Pomorstvo Vol. 32, No. 2, 2018
Seagoing vessels are highly complex systems. Major requirements of marine vessels are continuous running time and high production output. As such, these systems require high availability and reliability, and are dependent on preventive maintenance procedures. Development of diverse range of sensors, combined with overall reduction in price, enabled implementation of condition based maintenance in such systems. Large increases in fuel cost, environmental restrictions and further crew reduction are current trend in maritime industry. Considering...
Hrčak ID: 213336

eng Digital condition monitoring for smart transformers
Chakraborty, Sruti; Grisaru, Marius
Transformers Magazine Vol. 7, No. 5, 2020
A digital transformer is the centrepiece of a smart grid that gives agility to the business model of the power sector. It enables self-measurement, monitoring, analysis, and two-way communication of its condition using various electronic devices in real time. However, big data issues, high cost of sensors, rapidly changing digital technologies, and a lack of standardisation protocol restricts the emergence of a truly digital transformer. This paper describes that a multidimensional approach towards storage, analysis, and safety of condition mo...
Hrčak ID: 249602

eng Low Power Embedded System Sensor Selection for Environmental Condition Monitoring in Supply Chain
Zidar, Josip; Matić, Tomislav; Aleksi, Ivan; Sušac, Filip
In the modern world, different products and goods are available throughout the world thanks to the complex supply chain system. Often products are transported on long journeys with different transportation systems where products can be damaged or spoiled. Smart Sticker is a concept for product environmental condition monitoring that can resolve some problems in the supply chain. Smart Sticker will record product environmental data in the supply chain and enable producer/consumer product monitoring. Because of ultra-low-power design, Smart Stick...
Hrčak ID: 275167