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Technische Bibliothek

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    Artikel anzeigen 1 - 10 von 22 insgesamt
Continuity and Low Resistance Testing
No electrical test is simpler...and few more commonly employed…than the continuity test. This simple test is a ubiquitous option on multimeters (DMMs) and insulation testers. It is simple to perform; connect two leads across opposite ends of the test item (IUT), press the test button, and within seconds you have the resistance reading. Low is good, high is bad. It’s so simple and easy that it is readily applied to testing situations that require a more rigorous performance from the test instrument. This article will examine the parameters that determine the separation between the types of instrumentation.
Veröffentlicht: 6 März 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. 
Veröffentlicht: 14 Februar 2018
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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.
Veröffentlicht: 22 November 2017
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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.
Veröffentlicht: 2 August 2017
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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.
Veröffentlicht: 2 August 2017
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PowerOn TTSC June 2014
Improved transformer insulation assessment using dielectric response analysis.
Veröffentlicht: 2 August 2017
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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.
Veröffentlicht: 2 August 2017
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Transformer testing techniques and standard development
Review of IEEE, CIGRE and IEC standards for power transformer testing including overview of various frequency response analysis (FRA) techniques.
Veröffentlicht: 2 August 2017
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UHF PD-Diagnosis at high voltage cable terminations – International case studies
Different partial discharge defects show a different distribution in the frequency spectrum. These typical characteristics could be used in combination with the appropriate phase resolved partial discharge pattern for the analysis of partial discharge defects. The classification of the partial discharges allows an assessment of the defects in terms of its criticality.
Veröffentlicht: 2 August 2017
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Approximating a power swing and out-of-step condition for field testing
This paper will talk about a non-traditional method of that utilises the superposition of two waveforms of dissimilar frequencies to achieve a power swing and out-of-step condition.
Veröffentlicht: 2 August 2017
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  • Artikel anzeigen 1 - 10 von 22 insgesamt