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
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
• 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
RE: Short Circuits Attributes in SKM