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General rule of value of insulation resistance per KV operating voltage in transformer is__________.
3 MΩ/KV operating voltage at 50°C
°C
2 MΩ/KV operating voltage at 60°C
°C
5 MΩ/KV operating voltage at 50°C
°C
5 MΩ/KV operating voltage at 60°C
°C