船用电缆短路载流量

1)下列短路电流适用于电缆正常工作时导体的最大额定温度为90℃的电缆.

The following short current ratings are for cables normally operating at a maximum conductor temperature of 90℃ .

2) 作为理论计算的基础，按照IEC60724规定，短路中导体的温升为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) 乙丙橡胶绝缘在短路中所能承受的温度可高达250℃ .

EPR insulation are capable of withstanding of short term temperature up to 250℃ .

4) 短路时间为1秒时铜导体的短路电流值见下表；短路时间非1秒时，短路载流量通过下列公式计算： 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秒时的电流  Short circuit current for t second (A)

I1 : 短路1秒时的电流  Short circuit current for 1 second (A)

t: 短路时间 Short circuit duration (second)                                                                             5) 假定的短路时间为0.2-5秒。                                                      The duration of the short circuit based on these assumptions should be between 0.2 sec. and 5 sec.