... transformer with capacity of 315kVA~1600kVA, and protect the system in case of overload, short circuit, phase failure, ... enhancedfunction independence of individual parts and practicability of the system.Besides, the high-resolution A/D converter and ... in such cases as overload, short circuit, electricity leakage,insulation monitoring, overvoltage, undervoltage, three-phase imbalance etc.;5. ...