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Librairie technique Megger

Librairie technique Megger

La librairie technique de Megger donne accès à une diversité de ressources telles que des guides techniques, des guides d'applications et bien d'autres. En créant un compte Megger, vous pouvez enregistrer vos produits, accéder à de nombreux documents et à des mises à niveau de logiciels pour vos produits.

 

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    Affichage d'item(s) 11 - 20 de 29 au total
Power transformer demagnetisation
Abstract-Switching operations and direct current applied during routine testing procedures of static winding resistance measurement leave residual magnetization in the core and/or fully saturate the core of the transformer.
Publié : 6 juin 2018
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Pre-locating faults with alternative method to arc reflection
While the share of installed cables without a jacket generally continues to decrease, the unjacketed cables that remain continue to age. As they do so, it is increasingly likely that a fault will develop on these cables. It can be particularly troublesome to locate faults on unjacketed cables as normal Time Domain Reflectometry, or radar, based fault location techniques often do not work, due to the corrosion of the neutral wires. While there is no guaranteed action that would result in locating the fault, this paper will outline some advanced methods, based on field experience, that can help when locating these types of faults. This paper was an article presented at NETA in 2017 and will discuss the Impulse Current method, which does not rely on the neutral wires being intact, in both a theoretical and practical light. 
Publié : 6 juin 2018
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Lessons learned from a 400 kV busbar misoperation utilizing the IEC 61850 standard
This paper discusses the investigation of the tripping of a 400 kV substation due to improper operation of a bus-bar protection scheme.
Publié : 6 juin 2018
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Modern ART (Accuracy in Resistance Testing)
This paper will demonstrate the advantages of applying a variable low frequency AC waveform and, using temperature-to-frequency conversion techniques developed, and also the ability to correct any resistance value automatically to a to a known temperature corrected result.
Publié : 6 juin 2018
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Offline PD diagnostics using several excitation voltages
Diagnostics on both MV and HV cables is used as part of commissioning tests to check the quality of workmanship of newly installed cables and accessories. This paper goes into detail to all available excitation voltages for offline PD diagnostics.
Publié : 6 juin 2018
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Oil-paper insulation voltage dependency during frequency response analysis
Dielectric Frequency Response, DFR is the extension of power factor testing except that the measurement is performed from 1 kHz down to typically 1 mHz. It is a very useful tool for evaluating the moisture content in solid insulation of HV and EHV components such as power transformers, bushings, instrument transformers and PILC cables.
Publié : 6 juin 2018
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Individual temperature compensation
Dielectric testing techniques in the time and frequency domains are increasingly being used by transformer manufacturers, power utilities and researchers for transformer oil-paper insulation systems condition assessment.
Publié : 6 juin 2018
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Individual temperature correction (ITC) for insulation resistance measurements
The value of insulation resistance (IR) is strongly affected by the temperature of the material. However, in most cases IR measurements are done at the operating temperature of the given device. For this reason temperature correction is required to ensure that meaningful conclusions can be drawn from the measured values of IR
Publié : 6 juin 2018
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Innovative test and diagnostic system for medium voltage cables – PD monitored withstand testing versus non-destructive Partial Discharge (PD) diagnosis
For testing and partial discharge (PD) diagnostic purposes many different test voltage wave shapes and frequencies have been established over the past years. Their application is well proven and is guided by IEEE 400 norm.
Publié : 6 juin 2018
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Investigations on a combined resonance/VLF HV test system – partial discharge (PD) characteristics at VLF and DAC voltages
The necessity of HV cable testing is a given fact. So far, two testing methods, 24 hour soak or resonance testing are commonly used. This paper describes a comparison of test power demand dependent from voltage shape and test capacitance as well as the power consumption of test systems for different test techniques.
Publié : 6 juin 2018
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