I am not familiar with these topics, and my question is related to this one: Can a high voltage line kill a person without touching it?. In school I heard about step potential, which as far as I understand is essentially the potential difference between the feet of a human in an inhomogeneous electrical field (the example used lightning rod in the instant of a lightning stroke it causing a high current rushing through it). I am not sure if I explained it correctly, but if I did, then my question is: does this phenomena pose a danger around electric power lines? (By the way our teacher told us that the best we can do in such an electric field is to close our legs so our heels are touching each other.)
When the insulators aren't faulty, there isn't any noteworthy current flowing from the mast into ground. So the step voltage on the ground is very low.
That is much different e.g. from an earthing circuit in a TT or SWER power distribution system. Here, there is a noteable current running into the ground and countermeasures against too high step voltages near the earthing electrode have to be taken. Usually this is done by using several ring shaped earth electrodes around the building or the mast carrying the local transformer.