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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 345 in total
Thermal imaging batteries
Thermal imaging locates hot spots by examining the IR spectrum. Heat is the enemy of batteries.  A riseof just10°C willdeplete the lifeof a batteryby half. As molecules heat up,they move faster. This increases the rate of chemical reactions. This will increase the rate of oxidation that leads to corrosion. It will also increase the rate ofdry out in VRLA batteries. Heating will reduce the life of any battery regardless of the chemistry.
Published: 3 August 2020
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Thermal imaging and the heating effects related to power quality
Thermal imaging locates hot spots by examining the IR spectrum. Excessive current or high impedance will elevate heat in a system.
Published: 3 August 2020
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TTRU3 Factory ratio testing of power transformer
Transformer equipment manufacturers (OEMs) have a critical need to measure true ratio, as they must confirm proper manufacture of their transformers during construction and final assembly. Improper construction has consequences of higher cost, late delivery, and poor quality. The ability of a ratio instrument to be used for all steps involved makes it a practical valueto OEMs because only one instrument is purchased and used throughout each stage. Only the most reliable and accurate instruments make it to the factory floor. Winding stack under constructionre used: Art Mandigo Winding Service.
Published: 3 August 2020
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Testing frequency relays with SVERKER900 considering the IEC 60255-181 standard
This application note is more than a description of how to use SVERKER 900 for testing frequency relays. It also wantsto spread the knowledge about IEC standardization in relay protection. Many engineers often associate theIEC series of protection standards IEC 60255-1xx1to relay type testing, and believe that they do not need to have competence about this series of standards. This is a misunderstanding: many of the concepts, definitions and test procedures described in thestandards are there to be used in relay technique, no matter if the role is relay manufacturer, user, or commissioning / maintenance testing engineer ([2], [3]).
Published: 30 July 2020
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DLRO2: long test lead test mode
When measuring very low resistance the four-wire test method has for many years been the standard method. The main advantage being that it simply and easily removes the resistance of the test leads from the measurement. However, what happens when those test leads need to be verylong?
Published: 27 July 2020
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DLRO2: new difference meter
Introducing the first low resistance ohmmeter to feature a difference meter, a device that turns changes in resistance into a moving pointer and percentage change. When testing multiple similar connections, it makes it easy to spot those small increases in resistance that eventually turn into major faults.
Published: 27 July 2020
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PowerDB Software
Software download files for PowerDB
Published: 14 July 2020
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Partial discharge testing from Power Diagnostix
Power Diagnostix offers a wide range of partial discharge testing and monitoring systems for MV and HV applications.
Published: 6 July 2020
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Transformer Winding Resistance Measurement: Field Challenges
Megger’s article “Transformer Winding Resistance Measurement: Field Challenges” was presented at the 2020 NETA PowerTest Conference in Chicago, Il. This article takes an in-depth look at the lesser known facts associated with the DC winding resistance (WR) measurements, diving deeper into topics such as selection of the correct test current, and the importance of compliance voltage during the test. Phenomena as core saturation, current stabilization, the influence of winding inductance on readings, and the effect of temperature, are also explained.Article Brief:DC winding resistance measurements (WRM) performed on distribution and power transformers are used to diagnose internal issues such as shorted turns, burnt or open windings, poor connections, and problems with On-load tap changers (OLTC) and De-energized tap changers (DETC). Industry acceptance criteria recommends that winding resistance between phases should be within 2% of each other. Additionally, comparison may also be made with original factory measured data, where differences within 5% is considered satisfactory. Results should be temperature corrected when measuring against factory readings or historical measurements. If readings obtained are outside of industry standards, complementary tests are recommended to assess winding condition. Although performing a WRM is relatively straight forward, there exist several challenges that one can encounter while testing in the field. The following section discusses these field challenges and solutions to support winding resistance testing.
Published: 12 June 2020
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VLF Sine Wave 62 Firmware
VLF Sine Wave 62 Firmware
Published: 9 June 2020
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  • Showing item(s) 1 - 10 of 345 in total