标准规范下载简介
（ABB技术应用白皮书5）Circuit-breakers-for-direct-current-applications 2011【经典】.pdf8 Use of alternating current equipment in
ipmentindirectcurren
GBT 6892-2015标准下载Technical Application Papers
Table 19 Coefficient km accordling to the connection modality of the CB poles
I3= 10 xIln x km = 10 x 160 x 1.3= 2080 A (±20% tolerance)
8.2ConnectionoftheCBpoles inparallel
ent in direct curreni
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Miniature circuitabreakers
The following table shows the electrica/characteristics ofthe MCBs type S280 UC
Forthepoleconnectionspleaserefertothefollowi electricalscheme:
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to be used in d.c. circuits with high voltages, typical of photovoltaic plants (in the connection section between panels and inverter)
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Power distribution
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Motorprotection
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Characierstcs
AvailablesizeandmaincharacteristicsTmaxPy
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XSMSEMNEMSENESENEMSVEMSEMSEMSEMEMS
Direct current distribution systems
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earthing point Figure 27 IT d.c. distribution system with the middle point of the supply distribution systen isolatedformearth
Protectionagainstindirectcontact
The calculations on the following pages refer to this schema: Figure 29 Schema referred to the d.c. circuit
Figure 29 Schema referred to the d.c. circuit
0.95 Eb Ikb= R + 0.1 Rb
Timetopeakt.andrisetimeconstantT To determine these parameters it is necessary to calculate the relationshipi
0 R 1 L T.
with the time constant T, = 30ms
112577_网架钢结构施工组织设计ABBSAcEofferforuseupto1000Vd.c
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reakersforuseupto10
DB43／ 1665-2019 农村生活污水处理设施水污染物排放标准Technical Application Papers
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