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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) 31 - 40 of 280 in total
End to End testing of Transformer protection IEDs using Smart Testing Philosophy
Transformers are critical assets of power system network and their adequate protection is a matter of vital importance. Modern protection relays are usually defined as intelligent electronic device (IED) s, and they provide huge flexibility and enhanced protection features to assure correct operation of the equipment. Transformer protection IEDs are equipped with key features such as differential and restricted earth fault (REF) protection along with several other functionalities as per the guidelines of IEEE C37.91.
Published: 12 July 2019
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Protection of complicated bus arrangements using centralized low impedance intelligent electronic device
In this paper, protection of a complicated bus arrangement with dual bus coupler and bus sectionalizer using low impedance differential protection applicable for very high voltages like 220kV and 400kV is discussed. In many power generation stations, several operational procedures are implemented to utilize the transfer bus as main bus and to facilitate maintenance of circuit breakers and current transformers (in each section) without shutting down the bay(s). Owing to this fact, the complications in operational philosophy have thrown challenges for the bus bar protection implementation.
Published: 12 July 2019
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Transformer Life Enhancement Using Dynamic Switching Of 2nd Harmonic Feature in IEDs
Energization of a transformer results in sudden flow of current which is an effect of core magnetization. This current will be dominated by the presence of 2nd harmonic, which in turn is used to segregate fault and inrush current, thus guaranteeing proper operation of the relay. This additional security in the relay sometimes obstructs or delays differential protection in a specific scenario, when the 2nd harmonic content was present during a genuine fault. This kind of scenario can result in isolation of the transformer by Buchholz and pressure release valve (PRV) protection, which is acted when fault creates more damage in transformer. 
Published: 12 July 2019
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Standardization of Transformer Protection testing using Smart Testing Equipment
Transformers are critical assets of power system network and their adequate protection is a matter of vital importance. Modern protection relays are usually defined as intelligent electronic device (IED) s, and they provide huge flexibility and enhanced protection features to assure correct operation of the equipment. Transformer protection IEDs are equipped with key features such as differential and restricted earth fault (REF) protection along with several other functionalities as per the guidelines of IEEE C37.91. These functions are available with enhanced facilities such that it can incorporate the difference in phase angle based on vector rotation, ratio correction of current transformers used, interposing CT corrections etc… The increase in flexibility of the IED has also increased the complexity of programming it where a trivial error in the configuration will result in unwarranted operation causing loss of power and reduction of equipment life. 
Published: 12 July 2019
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Testing of complicated bus bar protection using smart testing methodologies
In this paper, protection of a complicated bus arrangement with dual bus coupler and bus sectionalizer using low impedance differential protection applicable for very high voltages like 220kV and 400kV is discussed. In many power generation stations, several operational procedures are implemented to utilize the transfer bus as main bus and to facilitate maintenance of circuit breakers and current transformers (in each section) without shutting down the bay(s).
Published: 12 July 2019
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Influence of Circuit Breaker Maintenance Tests on Busbar Differential Protection Scheme
In this paper, different methods of inhibiting the unwarranted operation of busbar protection relay during the CB testing is discussed with appropriate logics. This paper also focuses on providing proper security for bus faults by implementing relay logics to ensure minimal human intervention (prevention of bus bar blocking, throwing of knife switches for CT secondary shorting etc…) and acceptable modifications to the current protection scheme layout. Various methods are recommended that can be incorporated based on the suitability of the respective system condition. The discussed methods are developed in Intelligent Electronic Devices (IED)s using the advanced logics and algorithms. 
Published: 12 July 2019
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Electrical Tester - June 2019
Each issue of Electrical Tester has a range of hand-picked industry articles for high-voltage electrical engineers working on utilities.
Published: 1 July 2019
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VLF Sine Wave 62 Firmware
VLF Sine Wave 62 Firmware
Published: 19 June 2019
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Balance aids noise mitigation
Grounding and ground testing are topics and practices most widely recognized by familiar terms and organizations like Fall of Potential Method, 62 Percent Rule, IEEE and NETA standards and practices, and the National Electric Code® (NEC®). These and other significant contributions to the body of knowledge form the foundation of the subject and its implementation in practice.
Published: 13 June 2019
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Noise Control in Ground Testing
Grounding electrodes are typically buried metal objects; rods, interconnected arrays of rods, plates, grids, and various other designs aimed at putting a sufficient amount of metal in contact with the soil so as to safely and efficiently divert unwanted fault currents out of the electrical system and out of the protected facility. Upon construction, there is generally a ground resistance specification that is not to be exceeded. A performance test is run to assure that the system meets spec.
Published: 7 June 2019
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  • Showing item(s) 31 - 40 of 280 in total