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江蘇春晨電纜有限公司
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更新時(shí)間:2018-03-27 11:39:14瀏覽次數(shù):371次
聯(lián)系我時(shí),請(qǐng)告知來自 環(huán)保在線江蘇春晨電纜有限公司專業(yè)生產(chǎn)JEM電機(jī)引接線,System category A—This category comprises those systems in which any phase
conductor that comes in contact with earth or an earth conductor,is disconnected
from the system
System category A—This category comprises those systems in which any phase
conductor that comes in contact with earth or an earth conductor,is disconnected
from the system
with in 1 min.
System category B—This category comprises those system which,under fault
conditions,are operated for a short time with one phase earthed.This period should
not exceed 1 h.For a longer period,not exceeding 8 h on any occasion,can be
tolerated.The total duration of earth faults in any year should not exceed 125 h.
System category C—This category comprises all syatems which do not fall into
categories A and B.
電纜額定電壓的選擇Voltage designation
三相系統(tǒng)用電纜的U0 值*如下表:The values of U0 recommened for cables to be used in three-phase systems are listed below.
電纜的額定電壓應(yīng)適合于電纜系統(tǒng)的運(yùn)行狀況,用U0/U
(Um)kV 表示。JEM電機(jī)引接線
U0—電纜設(shè)計(jì)用的導(dǎo)體對(duì)地或金屬屏蔽之間的額定工頻電
壓;JEM電機(jī)引接線
U—電纜設(shè)計(jì)用的導(dǎo)體間的額定工頻電壓;
Um—設(shè)備可承受的“zui高系統(tǒng)電壓”的zui大值。kV
Um
kV
U0*kV
A 和B 類系統(tǒng)
Syetem categories A and B
C 類系統(tǒng)
Syetem categories C
6 7.2 3.6 6
10 12 6 8.7
15 17.5 8.7 12
20 24 12 18
30 36 18 -
35 40.5 21 26
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