Study Of Partial Discharge Measurement In Power Transformers
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Study Of Partial Discharge Measurement In Power Transformers
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Author : Jonatas Policarpo Américo
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2017-06-16
Study Of Partial Discharge Measurement In Power Transformers written by Jonatas Policarpo Américo and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-06-16 with categories.
This work aims to show an overview of the stage where the currently technologies of measurement of PD in power transformers and high-voltage measurement, in Brazil. The starting point is the presentation of the physical principles of formation of DP, followed by the presentation of the state of the art in measurement of PD in oil transformers, with emphasis on the most used techniques, with respective advantages and disadvantages and analysis of some of main types of equipment on the market. Specifically, are analyzed typical measurement circuits of PD proposed by the current standards for PD detection in high voltage equipment. Many techniques are cited in the course of work, comprising since measurement techniques as such location.
Measurement Of Partial Discharges In Power Transformers Using Electromagnetic Signals
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Author : Sebastian Coenen
language : en
Publisher: BoD – Books on Demand
Release Date : 2012-08-17
Measurement Of Partial Discharges In Power Transformers Using Electromagnetic Signals written by Sebastian Coenen and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-08-17 with Technology & Engineering categories.
Partial discharges within power transformers emit electromagnetic waves. The current thesis aims to provide fundamental knowledge about measuring and interpretation of the electromagnetic signals. Investigations in laboratory are confirmed by several case studies. The applicability using electromagnetic signals for partial discharge measurements on transformer in the field is demonstrated under real test conditions.
Calibration Methods For Reproducible And Comparable Electromagnetic Partial Discharge Measurements In Power Transformers
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Author : Martin Siegel
language : en
Publisher: BoD – Books on Demand
Release Date : 2020-11-20
Calibration Methods For Reproducible And Comparable Electromagnetic Partial Discharge Measurements In Power Transformers written by Martin Siegel and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-11-20 with Technology & Engineering categories.
The reliability of electrical energy networks depends on the quality and availability of their electrical equipment, e.g., power transformers. Local failures inside their insulation can lead to breakdowns resulting in high outage and penalty costs. To prevent these destructive events, power transformers are tested for partial discharge (PD) activity in a routine test before shipment. Furthermore, PD activity can be evaluated as a diagnostic measurement on-site (on-line or off-line) or be constantly monitored during service using the ultra-high frequency (UHF) method. In this thesis, a calibration procedure is proposed for the UHF method used in power transformers, which is lacking so far. The calibration process is required to ensure both reproducibility and comparability of UHF measurements. Only a calibrated UHF measurement procedure can be deemed reliable and eventually be introduced to supplement in (site-)acceptance tests of power transformers. The proposed calibration method considers two factors: The influence of the UHF sensors' sensitivity and that of the UHF instrument characteristics, including accessories like cables, pre-amplifier, etc. The UHF instruments' influence is corrected by using a defined and invariable test signal as a reference for all recording devices comparable to the calibration method used in IEC 60270 for electrical PD measurement. The sensitivity of the UHF sensor is addressed by a characterization of UHF sensors using the antenna factor (AF) measured in a special reproducible setup, i.e., a GTEM cell. In this thesis, a self-built GTEM cell is presented, which is oil-filled to address the environmental conditions inside a transformer where the sensor will be used. With such a cell, influences on the AF of UHF sensors are investigated, and it is shown that sensor sensitivities measured in an air-filled cell can be corrected to the oil environment. A practical evaluation of the proposed calibration procedure is performed in a laboratory setup on a distribution transformer with different UHF instruments and sensors using artificial PD signals and real high voltage driven PD sources. Finally, this thesis identifies future research topics, which may be needed to improve the proposed UHF calibration procedure for power transformers and the UHF method in general.
Partial Discharges Pd
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Author : Norasage Pattanadech
language : en
Publisher: John Wiley & Sons
Release Date : 2023-07-31
Partial Discharges Pd written by Norasage Pattanadech and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-07-31 with Technology & Engineering categories.
PARTIAL DISCHARGES (PD) — DETECTION, IDENTIFICATION AND LOCALIZATION Explore state-of-the-art partial discharge measurement techniques In Partial Discharges (PD) — Detection, Identification and Localization, a team of distinguished electrical engineers delivers a comprehensive treatment of the behavior, modeling, measurement, monitoring, localization, and evaluation of partial discharges. It includes coverage of all major advancements in the field that have occurred over the last few decades. It also discusses partial discharge phenomena, detection methods, and strategies for analyzing and processing collected data. Mechanisms of insulation failure are explored, as is the denoising of partial discharge measurement data and the localization of partial discharge in large, high-voltage equipment. Non-electric principles and procedures are discussed, and the book offers a variety of tables, figures, and photographs to illustrate the concepts discussed within. Partial Discharges(PD) also provides: A thorough introduction to the physical behavior of partial discharges, including their causes and classification Comprehensive modeling of partial discharge behavior, including classical and dipole discharges Practical discussions of the measurement of partial discharges, including the electrical method, partial discharge decoupling, and pre- and post-processing of partial discharges In-depth examinations of the monitoring of partial discharge behavior, including methods and realization Perfect for electrical engineers engaged in electrical power engineering, Partial Discharges (PD) will also earn a place in the libraries of research and development specialists employed in the manufacturing, quality testing and operation of electrical systems.
Ieee Recommended Practice For Partial Discharge Measurement In Liquid Filled Power Transformers And Shunt Reactors
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Author :
language : en
Publisher:
Release Date : 2010
Ieee Recommended Practice For Partial Discharge Measurement In Liquid Filled Power Transformers And Shunt Reactors written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Electric reactors, Shunt categories.
Location Of Partial Discharge In Power Transformers By Computation And Measurement Of Capacitively Transmitted Voltage Surges
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Author :
language : en
Publisher:
Release Date : 1995
Location Of Partial Discharge In Power Transformers By Computation And Measurement Of Capacitively Transmitted Voltage Surges written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.
Recent Trends In The Condition Monitoring Of Transformers
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Author : Sivaji Chakravorti
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-10-21
Recent Trends In The Condition Monitoring Of Transformers written by Sivaji Chakravorti and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-21 with Business & Economics categories.
Recent Trends in the Condition Monitoring of Transformers reflects the current interest in replacing traditional techniques used in power transformer condition monitoring with non-invasive measures such as polarization/depolarization current measurement, recovery voltage measurement, frequency domain spectroscopy and frequency response analysis. The book stresses the importance of scrutinizing the condition of transformer insulation which may fail under present day conditions of intensive use with the resulting degradation of dielectric properties causing functional failure of the transformer. The text shows the reader how to overcome the key challenges facing today’s maintenance policies, namely: The selection of appropriate techniques for dealing with each type of failure process accounting for the needs of plant owners, plant users and wider society; and Cost-efficiency and durability of effect. Many of the failure-management methods presented rely on the fact that most failures give warning when they are imminent. These potential failures give rise to identifiable physical conditions and the novel approaches described detect them so that action can be taken to avoid degeneration into full-blown functional failure. This “on-condition” maintenance means that equipment can be left in service as long as a specified set of performance standards continue to be met, avoiding the costly downtime imposed by routine and perhaps unnecessary maintenance but without risking equally expensive failure. Recent Trends in the Condition Monitoring of Transformers will be of considerable interest to both academic researchers in power systems and to engineers working in the power generation and distribution industry showing how new and more efficient methods of fault diagnosis and condition management can increase transformer efficiency and cut costs.
Partial Discharge Measurement In Distribution Power Transformers
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Author : Calvin Sithole
language : en
Publisher:
Release Date : 2013
Partial Discharge Measurement In Distribution Power Transformers written by Calvin Sithole and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Dissertations, Academic categories.
Discusses the appearance of PDs is a problem of insulation failure in high voltage equipment used in power plants. As the insulation of equipment has a sensitive zone, therefore the quality of insulation plays an important role in such power equipment. PDs in power transformers are capable of leading to corrosion on solid insulating materials, thereby in the long term, causing a breakdown of the particular operating component. It follows that the real challenge is to identify the most appropriate method for the measurement and/or detection of PDs.
Ieee Guide For Partial Discharge Measurement In Liquid Filled Power Transformers And Shunt Reactors
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Author :
language : en
Publisher:
Release Date : 2002
Ieee Guide For Partial Discharge Measurement In Liquid Filled Power Transformers And Shunt Reactors written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Electric reactors, Shunt categories.
Interpretation Of Uhf Signals Produced By Partial Discharges In Oil Filled Power Transformers
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Author : Gerard Patrick Cleary
language : en
Publisher:
Release Date : 2005
Interpretation Of Uhf Signals Produced By Partial Discharges In Oil Filled Power Transformers written by Gerard Patrick Cleary and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Oil-insulated power transformers are key components of the electrical transmission network. Knowing the state of their insulation is therefore of considerable interest to utilities. Failure in transformers often occurs as a result of electrical breakdown in the insulation materials. Such breakdowns may occur following insulation damage caused over a substantial period of time by the cumulative adverse effects of partial discharge (PD) activity. Recognition of PD in power transformers is important because early detection can allow utilities to take appropriate preventative measures in order that costly failures do not occur. In this work, a range of on-line partial discharge (PD) measurement techniques are reviewed. Ultra high frequency (UHF) and measurements based on the International Electro-technical Commission (IEC) standard 60270 are considered to be the most suitable. UBF measurements have the advantage that PD can be located using time flight measurements, while IEC 60270-based measurements can be quantified in terms pC. A test cell is designed, and PD current pulses are measured when the insulating oil at the tip of a sharp, conducting protrusion breaks down. Current pulses are recorded using two different measurement circuits, and different pulse shapes are observed. The experiments are of fundamental significance because UBF signals are only excited when discharges occur on timescales of around 1 ns or less. Results demonstrate that the durations of current pulses in oil can be sufficiently short to cause the excitation of UHF signals. Characteristics of PD generated in air, new transformer oil and used transformer oil are compared. PD current pulses are measured simultaneously with both EEC 60270-based and UHF measurements systems. Since EEC 60270-based and UBF measurement systems operate on very different principles their responses to PD current pulses of known magnitude provides a useful basis for comparing the performance of both systems. A range of insulation defects that would cause concern in an operational power transformer are then investigated. Radiated UHF signals are measured simultaneously using two broadband electric field sensors. The spectral content and energy of rating measured using each sensor during both half cycles are shown to be useful methods to assist with the understanding of discharge behaviour. UHF PD signals are also measured in a phase-resolved form, and these are analysed in ways that provide evidence of the physical differences between insulation defects. First tests are carried out on a 1000 MVA, 400 kV/ 275 kV power transformer, and results demonstrate that the UBF measurement technique is a very promising approach for PD monitoring. The research contributes to the knowledge base required for the development of continuous monitoring systems for partial discharge and arcing in oil-filled power transformers.