There was an article in T&D Magazine back in April 1991 that performs a comparison of both. Published by an engineer with Oklahoma Gas & Electric...
The conclusion is that arresters on all phases is the best method for both cost and switching surge protection. The static or aerial grounding...
I would recommend SEL relays. We have been able to eliminate transducers for SCADA, control switches, panel metering, reclosing cutoff switches, interposing relays etc. In addition all SEL relays and communications devices use the same protocol for communications. The nice thing is that they...