船用電纜短路載流量
1)下列短路電流適用于電纜正常工作時導體的額定溫度為90℃的電纜.
The following short current ratings are for cables normally operating at a maximum conductor temperature of 90℃ .
2) 作為理論計算的基礎(chǔ)，按照IEC60724規(guī)定，短路中導體的溫升為250℃
As a basis of the calculation, the theoretical temperature that arises in the conductor during a short circuit is 250℃ in accordance with IEC 60724.
3) 乙丙橡膠絕緣在短路中所能承受的溫度可高達250℃ .
EPR insulation are capable of withstanding of short term temperature up to 250℃ .
4) 短路時間為1秒時銅導體的短路電流值見下表；短路時間非1秒時，短路載流量通過下列公式計算： The short circuit current rating for copper conductors given in the table are values for 1 sec. and for other duration the current may be calculated by the following formular;
I
I = 1
It : 短路t秒時的電流 Short circuit current for t second (A)
I1 : 短路1秒時的電流 Short circuit current for 1 second (A)
t: 短路時間 Short circuit duration (second) 5) 假定的短路時間為0.2-5秒。 The duration of the short circuit based on these assumptions should be between 0.2 sec. and 5 sec.
導體截面積 Conductor area | 短路1秒時的電流 Short circuit current for 1sec. | 導體截面積 Conductor area | 短路1秒時的電流 Short circuit current for 1sec. |
mm2 | A | mm2 | A |
1 1.5 2.5 4 6 10 16 25 35 50 | 143 215 358 572 859 1431 2289 3577 5008 7154 | 70 95 120 150 185 240 300 | 10016 13593 17170 21463 26470 34340 42925 |
