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Short Circuits Attributes in SKM

Short Circuits Attributes in SKM

Short Circuits Attributes in SKM

(OP)
Hello Everybody

I am conducting a Relay Coordination Study on SKM. Before this I have worked on ETAP.
While working on SKM, there are too many attributes for Shortcuits based on IEC and ANSI. Which short circuit attribute I shall choose for my study.

Thanks

RE: Short Circuits Attributes in SKM

If you are using SKM PTW only to define the max and min currents for protective device grading, then the SKM / PTW Comprehensive short-circuit study is recommended for the following reasons :
• For a short-circuit on a designated bus, branch current can be reported in all system branches and voltages at all buses can be reported,
• In a meshed system where contributions through multiple upstream devices must grade with a single downstream device, an automatic offset of the upstream devices is possible based on the ratio of current through a meshed upstream device and the single downstream device.
• Only the Comprehensive Short-Circuit study calculates the earth return current ( I''kE2E ) for a  PPE fault.

If you are conducting a short-circuit study to specify switchgear short-circuit withstand ratings, then :
• In IEC land the IEC 60909-0 ( same as AS 3851 ) short-circuit methodology is required to calculate the short-circuit parameters required to specify switchgear to IEC or AS Standards.
• In USA, the ANSI C37 short-circuit methodology is required to calculate the short-circuit parameters required to specify switchgear to ANSI  Standards.
 

RE: Short Circuits Attributes in SKM

Dear Eddy, are same things can be achieved in ETAP also?

RE: Short Circuits Attributes in SKM

Hello IndianTechEngg1001, I am not familiar with ETAP.

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