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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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    Showing item(s) 1 - 10 of 275 in total
2018 Electrical Test Equipment Catalog
2018 Distributor Catalog
Published: 13 November 2018
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Lithium Ion Battery Testing
Lithium ion batteries consist of a family of batteries. They have different chemistries and characteristics to suit different applications.
Published: 8 October 2018
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Seven Tips for Insulation Resistance Testing
Seven tips for insulation resistance testingPaul Swinerd - Product portfolio manager - Power Insulation testing at voltages above 1 kV can be a quick and convenient way of gathering a lot of useful information about the condition of electrical equipment. To stay safe and to get the best results, however, it is important that the testing is carried out correctly. These tips should help, but remember that it’s always essential to follow the manufacturer’s instructions for the test set that’s being used, to abide by the relevant standards and to follow good working practices. 1. Use the right test leads.Manufacturers of insulation resistance testers go to a lot of trouble to produce test lead sets that will help make their instruments safe and convenient to use. Always use a lead set that’s designed for the instrument, appropriate for the test voltage you’re planning to use and suitable for the test object you’re working on. If the connections can’t be made securely, the test lead may become accidentally disconnected, leaving the test object charged to a dangerously high voltage. Never ever use test leads that show any sign of damage and never attempt to repair damaged or worn leads – replacing them is the only safe option. 2. Choose the best test voltage. Test sets are now available that will allow testing to be carried out at voltages up to 15 kV. Testing at higher voltages can yield additional and more useful information about the condition of the test object’s insulation, but using a voltage that’s too high for a particular test object to withstand can seriously damage it.  Always refer to the supplier’s data for the object under test and follow the guidance it contains on testing. If this isn’t possible, seek help from the manufacturer of your insulation tester. 3. Choose the right test. A quick one-off insulation resistance measurement can sometimes provide useful data, but modern insulation resistance test sets have much more to offer. Typically, they offer facilities for polarisation index (PI), dielectric absorption ratio (DAR), dielectric displacement (DD), step voltage (SV) and ramp tests. Full information on these tests and how to carry them out should be in your instrument’s handbook – if it isn’t consult the manufacturer. Some of these more advanced tests take a little longer to perform but, with many kinds of test object, they can provide much more reliable information about insulation condition. 4. Use an instrument with a high measuring range.If your instrument shows all results above, say, 1 TΩ as infinity, you’ve got no way of knowing that the insulation resistance of your test object has fallen from 30 TΩ to 2 TΩ since the last time you tested it. This latest result might still fall within the range that’s considered acceptable for the test object, but a big fall in resistance value like this is often a valuable early warning that a problem is developing. An instrument with a high measuring range will alert you to this situation. 5. Complete the test before disconnecting the test set. Test objects can hold a lot of charge and, particularly when they’re being tested at high voltages, the stored charge can be lethal. Modern testers guard against this problem by safely discharging the test object when the test has run to completion or when it is terminated by the user. If the test leads are disconnected prematurely, however, the discharge function can’t operate, and the test object will remain charged – and dangerous. 6. Use the guard terminal.Surface leakage over test objects like bushings can greatly reduce their apparent insulation resistance and, as a result, there have been many cases of insulators being scrapped when all that was really necessary was to clean them. Using the test set’s guard terminal – which is usually connected to a bare wire wrapped around the surface of the object under test – eliminates or at least greatly reduces the effect of surface leakage on the test results. And don’t forget that making two measurements, one with the guard terminal connected and one without, can provide a very good indication of whether or not the insulator needs cleaning. 7. Record and trend your results.A single insulation resistance measurement can give you a quick indication of insulation condition, but a series of measurements over a period of time, with the results recorded and trended, will tell you a lot more. If the insulation resistance of your test object is declining over time, for example, it’s probably a good idea to find out why, well before it declines to the point of failure. Accurate records will also quickly show up any sudden deviation from the usual insulation resistance values, which is always a strong indication that further investigation is necessary. For additional information that will help you to get the best from the time and money you invest in high-voltage insulation testing, download the free application guide to insulation testing above 1 kV.  
Published: 3 October 2018
Demagnetization of power transformers
In the marketplace for electrical transformer test equipment, there is a lot of talk about demagnetization of transformers. It is a recommended practice that probably will make it into the international guidelines and standards for transformer testing in the future.
Published: 28 September 2018
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General
multiple applications
Published: 16 August 2018
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NAFTA Power Short Form Catalog
Megger catalog of electrical testing equipment for power systems including power protection, power transformers, cable infrastructure and general electric.
Published: 15 August 2018
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Electrical tester - June 2018
Each issue of Electrical Tester has a range of hand-picked industry articles for high-voltage electrical engineers working on utilities.
Published: 9 August 2018
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Demand Power and Energy (Part 1)
The term Demand pertains to both power and energy parameters. When referring to AC Power there are 3 different parameters to access, active power, reactive power and apparent power.
Published: 31 July 2018
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Solar Energy - Part 3 of 3: Analyzing Solar PQ Data
This application note looks at what you should check when analyzing the power quality data from a solar panel application.
Published: 3 July 2018
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Solar Energy - Part 2 of 3: Programming a PQ Analyzer
When examining potential power quality issues associated with solar panels, your power quality analyzer should be programmed to examine a variety of different parameters outlined in this application note.
Published: 3 July 2018
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  • Showing item(s) 1 - 10 of 275 in total