It's a steam power plant and we generate power for the grid. Our line voltage is 19K that steps down to 4160 for some of our plant use and then steps down to 480 for plant use. While the plant is on line the voltage is 480 due to plant load but when the plant is off line (No plant load) the...
I am currently at a power plant here in Texas and the 480VAC system swings from 480 while equipment is on line and as high as 536VAC when equipment is off line. They tell me that this is prefectly normal but I have never seen swings like this at any power plant. So, is this normal???