Grid Impedance and Transients

[redstar9280]

Can any1 xplain that while we reduce grid impedance keeping its voltage constant, why does the magnitude of overvoltages and overcurrents decrease as compared to higher grid impedance, any reasons,,, please help??? Specifically i am talking about Mechanically Switched Capacitor Damping Network.

 

[Skogsgurra]

Having similar thoughts. Is this a general question or do you have any standards or data?

Gunnar Englund

http://www.gke.org

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Half full - Half empty? I don't mind. It's what in it that counts.

 

[Skogsgurra]

A discussion some four years ago here thread237-207168

Gunnar Englund

http://www.gke.org

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Half full - Half empty? I don't mind. It's what in it that counts.

 

[redstar9280]

Yes i have calculated data. Also using PScad simulation software, i have tried many combinations like switching at zero crossing of grid voltage, switching at maximum of grid voltage,,,, Always when i reduce grid impedance, overvoltages and overcurrents reduce as well

 

[Skogsgurra]

The energy in the transient is defined by U, L, C and when the switching takes place. If this energy is constant, it seems quite natural that voltage is reduced when impedance is lower.
My interest here is more what transients you see IRL.

Gunnar Englund

http://www.gke.org

--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.