Technical library

Technical library

The Megger technical library provides access to a range of additional content and resources such as technical guides, application notes and more. Use the filters to browse specific content (e.g. application notes) or refine your search to a particular electrical application area. 


If you would like to see the content we have available on a particular subject or need to locate some software, simply enter a search below. Please note, you will need to create an account to access some resources.

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Case study: Misleading line frequency insulation results on a contaminated transformer
A 1978 vintage, 20 MVA, 69/13.09 kV, Dyn1 transformer, operating for a major North American utility, was taken out of service to repair a pump in the cooling system. The technical maintenance team completed the required repairs and conducted a complete protocol of routine commissioning tests, including a 10 kV line frequency (LF) power factor (PF) test.
Published: 9 December 2021
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Auxiliary voltage tests of circuit breakers
Measurement of the outer limits of the operating mechanism is required by international standards such IEEE C37 and as IEC 62271, when certifying a circuit breaker (CB). Some of those tests are valuable to repeat in field tests, obviously to ensure that the CB fulfil its design specification, but those tests and some additional tests in similar spirit can also disclose potential future problems. The most common is to vary the auxiliary voltage but it could also be other energy resources for example hydraulic and pneumatic pressure. This application note will focus of the auxiliary voltage, what the standard requires, sort out the terminology and what tests that are valuable to repeat in field tests.
Published: 29 November 2021
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Insulation resistance testing of surge/lightning arresters
Electric power transmission and distribution systems are vital for modern life. And, since the electricity these systems provide is essential, then these systems are essential too. One of the less celebrated components of these systems is the humble surge arrester. These arresters serve the important job of keeping the electric supply smooth and steady. As such, these devices must be tested regularly as part of a maintenance program.This application note looks at what a surge arrestor is, the test procedures of insulation resistance testers, as well as present test results and recommendations.
Published: 5 November 2021
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E-Tray Software
Software downloads for E-Tray products including Smart-Thump, EZ-Thump, EZ-Restore Overdrive and T3090.
Published: 25 October 2021
Software download files for SMRT
Published: 15 October 2021
MOM2 and CT in loop
For most of the breakers the MOM/DLRO is as accurate as other types of micro-ohmmeters but if there is a current transformer (CT) in series with the breaker contact to be tested then it is advisable to make some basic checks
Published: 12 October 2021
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Micro-ohmmeter testing with MOM2
To measure a low resistance connection could be a demanding task. If using an ordinary multimeter (DMM). It will make measurements of resistance values down to a tenth of an ohm.
Published: 12 October 2021
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Dual ground breaker testing
This application note informs about how to perform testing of breakers with both sides grounded. Valid for both Mjölner 200 and Mjölner 600
Published: 12 October 2021
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Testing Reclosers with ODEN or INGVAR
This application note informs about testing of reclosers with ODEN/INGVAR (herafter only ODEN is mentioned, though the text is valid for both products).
Published: 12 October 2021
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Testing Current Transformer with ODEN or INGVAR
This application note is about primary injection testing of low voltage (LV) circuit breakers (CB) with the primary test equipment ODEN or INGVAR (hereafter only ODEN is mentioned, though the text is valid for both products), and the challenges that could arise for various CB installations.
Published: 12 October 2021
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  • Showing item(s) 1 - 10 of 384 in total