reactive current during a fault

[xernoxian]

when there's a fault and reactive current is being injected into the power system, wouldn't this reactive current contribute to the fault current?

 

[dpc]

What's "injecting" current? Fault current generally is highly lagging (low power factor).

 

[electricpete]

I agree. The fault itself is low impedance and if anything resistive.
Source impedance plays a larger role in determining power factor angle of current flowing toward the fault (when compared to a voltage phase reference upstream of that source impedance). Typically inductive (Cables, transformers).

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(2B)+(2B)' ?

 

[xernoxian]

i know that usually wind turbines are required to inject reactive current into the power system during a fault to stabilize the system but i'm wondering if this current injected wouldn't just make the fault much worse.

 

[Adam1980]

The requirement of wind turbines to provide support during a fault is through injecting capactive reactive current in the range of 1 to 1.5 pu with various time duration requirement.

The injected fault current will provide support of the voltage and of course will be only a small portion if compared to the fault current coming from the network side.

The injected fault current will increase the total fault current of course but that is one negative aspect of having a "stronger network". on the plus side this will aid in supporting the voltage!