What is the theory behind DC arc fault detection for PV systems?

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Josh11
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Hello,

I am wondering where a good article may be discussing the theory behind DC arc fault detection for PV systems. Seems most articles are based on detection for AC circuits.

Trying to have a better understanding for troubleshooting purposes.
 
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http://energy.sandia.gov/wp/wp-content/gallery/uploads/WREF_Arc-Fault_Forum_Johnson_SAND2012-3097C.pdf