День: 24.12.2025

Is the deviation within the 0.5% limit? Deciphering the Critical TTR Reading

For over twenty years, I’ve stood in substations and plant floors, the hum of transformers in the background, a turns ratio tester in my hand. In that time, one question has sparked more intense discussions than any other: “The reading is off by 0.6%. Is this a real fault, or could it be the tester?” […]