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How to calculate HT fuse ratings for a single phase PT?
The IEC technical report 62655 “TUTORIAL AND APPLICATION GUIDE FOR HIGH-VOLTAGE FUSES” incorporates a chapter about this very topic: 5.2.5 Voltage transformer applications. Maybe you should read it; it seems this application is really tricky due to the very low load current, preventing basically any protection of overload situations or winding faults before they evolve towards more powerful faults…
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