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Mitigating Geomagnetic induced currents

Mitigating Geomagnetic induced currents

Mitigating Geomagnetic induced currents

(OP)
It seems that the end of the world crowd has policy makers greatly worried about coronal mass ejection events, solar flares, etc reaching out and sending civilzation back to the stone age.  The fear is that induced low frequency AC or induced DC currents will destroy power transformers.  

Without getting into any of the merits of this I would like to know what mitigation measures (if any) people have taken.  

FYI, we deem it not to be an issue here since we use a spare in place transformer design (so bank loading is always under 50%) , we use single shell xfmrs, and we at at mid-latitude in North America.  

What experience to you folks have with transformer neutral resistors, etc.  Do you mitigate directly, or monitor ground current and trip the transformer above some certain level? Or do you just watch what happens?  I do recall that Hydro-Quebec seemed to be the utility that dealt with this mostly in the past...    

RE: Mitigating Geomagnetic induced currents

In India we had used neutral filters to keep away Dc currents entering in to transformers from HV DC transmission.

RE: Mitigating Geomagnetic induced currents

Hello trlols,
as far as I know using 3-ph 3-limb core-type transformers (without tertiary and with magnetic flux shields) can mitigate the effects of dc or low frequency induced currents, both from solar storms and HVDC converters.
 

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