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.
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
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
Software downloads for E-Tray products including Smart-Thump, EZ-Thump, EZ-Restore Overdrive and T3090.
Published: 25 October 2021
Testing Low voltage breakers 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
Testing Ground grid with ODEN
The ground grid is intended to carry current into the earth to both protect equipment and assure personnel in the vicinity aren’t exposed to electric shock, as would result from excessive step or touch potentials.
Published: 12 October 2021