It's easy to measure I2t, isn't it? Every text book shows it as a square pulse, so just integrate the square of the current over the length of the pulse. No problem.
But real-life surges don't look like that. They are exponential, modulated by 50Hz, and decay down to the normal running current of whatever has just caused the surge, not to zero.
So where does the upper limit of integration go?
But real-life surges don't look like that. They are exponential, modulated by 50Hz, and decay down to the normal running current of whatever has just caused the surge, not to zero.
So where does the upper limit of integration go?