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IEEE C37.47-2011 pdf free

IEEE C37.47-2011 pdf free.IEEE Standard Specifications for High-Voltage (> 1000 V) Distribution Class Current-Limiting Type Fuses and Fuse Disconnecting Switches.
Due to the wide variation in fuse types. interchangeability guidelines have little meaning. Standard ratings such as ‘C.” which is defined in this standard, only provide a basic level of time-current characteristic (TCC) conformancc and do not providc enough information to establish proper application and coordination of fuses. This is particularly true when different fuse types or fuses front different manuflicturers arc being applied together. Published information, such as current ratings and TCC curves, should bc used to sclcct fuses, following manufacturer’s rccommcndations. If thcrc arc specific questions. the manufacturer should be consulted.
1.4 Background
Some of’ the current-limiting type fuses listed in I I are similar to those now covered in IEC 602X2- I. The IEEE fuse standards primarily reflect applications common in North America and in countries that usc electrical systems designed using similar principles, while IEC standards tend to rely heavily on practices common in Europe. As a result, several significant differences exist in the testing requirements and chiefly relate to the intent that IEC fuse testing is primarily for use on noneffectively grounded. neutral, three- phase systems, while the IEEE focuses more on single-phase and effectively grounded systems. The diflrenccs in test requirements may therefore result in devices tested to IEC that do not meet the requirements of IEEE/ANSI standards, or ‘icc versa.
In the headings and the text of this document some information is included in brackets []. The information in brackets is a term used in IEC standards that may be similar to the term used in this standard. a term that is commonly used in some parts of the world, or a term that has been used previously in ANSI and IEEE standards. Again, caution is advised when making comparisonS.
1.5 DescrIption of fuse-enclosure packages using distribution class current- limiting type indoor fuses
— Tipt iC’L: A fuse mounted in a large enclosure with relatively free air circulation within the enclosure (e.g., a fuse mounted in a live, front pad-mounted transformer or in a vault). The relevant fuse rated maximum application temperature (RMAT) is based on that of the air that is cooling the fuse. Note that if a fuse were mounted outdoors but in ambient temperature above 40 UC, ambient air conditions on the fuse would be the same.
— Tipe 2CL: A fuse mounted in a fuse container. This is a relatively small enclosure, defined as one supporting the fuse and restricting the air, gas, or liquid flow surrounding the fuse (e.g., a fuse inside a canister in a transftrmer or a vault). Ilowever. the fluid flow (gas. liquid, or a combination of the two) that cools the outside surface of the container has relatively free circulation. The relevant fuse RMAT is based on that of the fluid that is cooling the container. Fuses tested in accordance with Clause 6.6 of IEEE Sid C37.4liM20OX. i.e., tested for use in air no hotter than 40 °C. that arc encapsulated with solid insulation (e.g., rubber or epoxy), can be considered to be this type of fuse-enclosure packages (FEPs) when so encapsulated. In this case, the relevant fuse RMAT is based on that of the fluid that is cooling the encapsulated fuse.IEEE C37.47 pdf download.

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