I have a case of a small distribution generator that is sized larger then the minimum load on the line, so the generator has the ability to carry line load if the utility trips. The utility is saying a direct transfer trip (DTT) scheme will be needed to ensure the gen trips if the utility trips. So far the utility is not saying what technology is going to be needed. I have someone telling me unlicensed radio transceivers would be the way to go (SEL has a couple items), but I question whether the utility is going to buy using unlicensed radio for DTT. Might swing as this is a low risk application. Before I talk to the utility engineer, does anyone have any experience in low budget DTT? Running fiber from the substation to the customer of course is a nice idea, but it seems a major investment.
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