Summary: Ask from the protection of distribution circuitry and protect the point of view that electric equipment develops, analyse and compared the main actor defect of fuse and breaker. On this foundation, the type selecting plan of fuse and breaker is concerned in giving out to design. Point out the intention that should affirming knowledge fuse and breaker are respective and characteristic, and the effect that they produce below different condition.
Keyword: Fuse breaker is alternative protect
1, problem put forward
Come nearly more than 10 years, in no matter be the low-pressure distribution system of industrial structure, civil building and outdoors device,be being designed, fuse of use low pressure is less and less, great majority uses low-pressure breaker machine-madely even; Be fuse of the furnish in low-pressure distribution box to what answer to it also decrease greatly. In the application that protects electric equipment in low-pressure distribution system, the author thinks this is incorrect or not comprehensive understanding. Accordingly, be necessary to be opposite fuse and breaker (all point to low pressure below) undertake a few compare and analyse, with can more correct, choose electric equipment of these two kinds of protection reasonably.
2, the development that distribution circuitry is protected and protects electric equipment
Protection of 2.1 distribution circuitry asks
Low pressure matchs electrical wiring road, be in to defend malfunction (like overload, short circuit and ground connection breakdown) when endanger person security (the electrical shock that medical contacts brings about) , or it is circuit passes to heat up and bring about attaint to cause electric fire even, match the preventive measure that electrical wiring road should be necessary, with protecting line safety is mixed the safety that use phone. Because low pressure matchs electric line to spread all over all sorts of buildings as a result is outdoors everywhere, malfunctioning odds is big, and a large number of non-professionals may be contacted, more appear it is particularly important that this kind defends. The mainest preventive measure is in namely furnish of various distribution circuitry protects electric equipment, when with assuring to be in circuit malfunctions, disconnect effectively breakdown circuit. These protection should accord with GB50054-95 " low-pressure distribution design is normative " concerned regulation. For this, various circuitry should install protective electric equipment not only, still must want to be rectified correctly decide its parameter, cut off breakdown in order to assure reliably inside formulary time; Still ask to should cut off circuit selectively, ask namely most the movement of protective electric equipment that approachs breakdown point, and its ranking protection electric equipment not movement, the scope that cuts off circuit in order to make is the least.
The type of 2.2 protection electric equipment and develop
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