URT Ultra-Rapid Fuse Links for the Protection of Semiconductor Rectifiers
■The design of rectifier equipment requires specific provisions in the switchgear for the protection of power semiconductor components have low thermal capacity so that the requirements for the planned protective device exceed those of standard devices. Both the rated current and voltage as the criteria for the fusing selection are no longer sufficient and the following has to be considered:
▲High speed of response in the overload range
▲Operating integrals adjusted to the limited load integrals of the semiconductor cell
▲Low switching voltages during breaking process
▲Low temperature rise and power loss of the protective device under operating conditions
■Further important design aspects are the price of the protection device in relation to the total the equipment, as well as down time after a fault. SIBA ultra-rapid fuse links meet these requirements and efficient protection is provided.
Features include:
▲Extremely fast time/current behavior and low operating integral values
▲Low temperature rise at the insulating body due to excellent thermal conductivity of the
▲special ceramic.
▲Low power loss under rated conditions.
▲Free of ageing, due to the use of pure silver elements.
▲Low switching arc voltage due to special element design.
■The technical information presented here is intended to be used as a basis for design, and includes all the basics necessary for the selection of devices offering the maximum protection for rectifiers. Firstly, the fuse specific data is explained in detail, rendering a basis for the following chapters which examine the breaking process.
■SIBA data sheets include characteristic curves, these are described in this documentation and examples given.
The most commonly used rectifier circuits are shown in tabular form, properties of parallel and series connection of fuse links are given, and possible faults in circuits are treated.
Thermal influences, alternating load operation and current shock loads are considered and compensated by conversion coefficients described in the following chapter.
■Finally, the last chapter shows, the criteria for calculating the optimum fuse link, and includes a flow diagram for an easy overview.
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2021/06/03 |
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777 KB |
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