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Librería Técnica

La librería técnica de Megger ofrece acceso a una amplia gama de contenidos y recursos, tales como guías técnicas, notas aplicativas y mucho más. Cuando usted se registra y crea una Cuenta Megger, usted puede entre otras cosas, registrar su producto y tener acceso a una amplia gama de actualizaciones de software y descarga de catálogos y folletos específicos sobre su productos.

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    Mostrando artículo/s 51 - 60 de 201 en 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.
Publicado: 12 julio 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. 
Publicado: 12 julio 2018
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The characteristics of insulation resistance
During recent years a great deal of valuable research work has been done to increase our knowledge of the properties of insulating materials, yet notwithstanding the progress so made the natural laws governing insulation resistance are but little understood.
Publicado: 12 julio 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.
Publicado: 12 julio 2018
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On-site testing of special transformers
The increased usage of the phase shifting transformers in various fields within power systems has introduced new challenges in performing on-site maintenance testing.
Publicado: 12 julio 2018
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PowerOn TTSC June 2014
Improved transformer insulation assessment using dielectric response analysis.
Publicado: 12 julio 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.
Publicado: 12 julio 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.
Publicado: 12 julio 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.
Publicado: 12 julio 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.
Publicado: 12 julio 2018
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  • Mostrando artículo/s 51 - 60 de 201 en total