短路电流计算C因子

C Factor of ETAP Short Circuit Current Calculation-IEC Standard

In this group of ETAP, youspecify if the maximum or minimum short circuit current to be calculated andbased on the selection, different c factors will be used to modify sourcevoltage. There are three options available: Max, User-Defined c Factor, andMin. When the Max option is selected, the maximum values for c factor is usedto calculate maximum fault current:

Nominal Voltage Un	Voltage factor c for the maximum fault current calculation
< 1001 V	c Factor = 1.10
1001 to 35000 V	c Factor = 1.10
> 35000 V	c Factor = 1.10

When the User-Defined c Factor option is selected, ETAP uses theuser specified c factor. The ranges for the c factors are as follows:

Nominal Voltage Un	Voltage factor c for the maximum fault current calculation
< 1001 V	c Factor = 0.95 -- 1.10
1001 to 35000 V	c Factor = 1.00 -- 1.10
> 35000 V	c Factor = 1.00 -- 1.10

When the Min. option is selected, the minimum values for c Factor,as defined in IEC 60909 Standard, are used to calculate minimum fault current.

Nominal Voltage Un	Voltage factor c for the maximum fault current calculation
< 1001 V	c Factor = 0.95
1001 to 35000 V	c Factor = 1.00
> 35000 V	c Factor = 1.00

In each case, ETAP calculates ip, I"k, and Ik .

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