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Software download files for Frax
Published: 25 September 2019
DC test of vacuum integrity in MV switchgear
Since the 1950’s vacuum has been used as insulation media in switchgears. Even though that technology has proven to be very reliable, over time air will leak into the vacuum chamber and degrade the insulation. Also, a good practice is to measure after transport or accidents. The accepted way to test the vacuum integrity has always been through a voltage withstand test. For field tests DC test is preferred due to the weight andsize of the instruments.
Published: 19 September 2019
Motor Analysis with the MPQ Analyser
Bearing failures are often blamed on poor lubrication. However, there are many other causes of bearing failures. Analysing the failure cause can lead to higher motor reliability.
Published: 8 September 2019
TTRU3 Phase Shifting Transformers
The TTRU3 is capable of performing turns ratio tests on any phase shifting transformer by allowing for phase shifts to be entered with respect to the secondary winding. But with all of the different ways phase shift is expressed, how do you know if the entered phase shift value is correct?
Published: 22 August 2019
In the UK, we have two common power systems supplying locomotives. A 25 kV overhead line system and a 750 V third rail system. Both systems use the track as a return path for current flow (see figures 1 and 2).
Published: 22 August 2019
Expanding the Diagnostic Impact of Power Factor Testing - Interpretation of Narrow Band Dielectric Frequency Response
The Narrow Band Dielectric Frequen-cy Response (NBDFR) test method consists of a series of power factor measurements ranging from 1 to 1000 hertz. This aggregate of the CHL (pri-mary to secondary) measurements constitutes the dielectric response of the test specimen. The subsequent evaluation consists of a geometric analysis of a plot where the mea-sured power factors and correspond-ing frequencies are graphed. As an insulation system ages, the response migrates towards the high frequency end of the plot. When the frequency corresponding to the lowest magni-tude within the response (the trough) is used as a reference point, the move-ment of the response may be quanti-fied; enabling the transformer may be classified in terms of condition.
Published: 15 August 2019
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