askeljännitteitä

Askell jännitteitä, also known as step voltages, are a phenomenon that occurs in electrical grounding systems. They are essentially voltage differences that arise across the surface of the earth when current flows into the ground. This typically happens during fault conditions in electrical systems, where a high current is discharged into the earth electrode. The earth itself is not a perfect conductor, and its resistance causes the current to spread outwards from the point of injection.

As the current flows through the earth's resistive medium, it creates a potential gradient. This means that the electrical potential is higher closer to the grounding electrode and gradually decreases with distance. An askeljännitteitä is the voltage difference measured between two points on the earth's surface that are separated by a distance equivalent to a person's stride. If a person were to stand with one foot near the grounding electrode and the other foot further away, they would experience this voltage difference across their body.

These voltage differences can pose a safety hazard. If the step voltage is sufficiently high, it can cause dangerous currents to flow through a person's body, leading to electric shock. The magnitude of the step voltage depends on several factors, including the magnitude of the fault current, the resistivity of the soil, and the distance between the two points. Effective grounding system design and the use of conductive materials in surface layers can help to reduce the severity of step voltages and mitigate the associated risks. Measures such as equipotential bonding and ensuring adequate spacing of grounding electrodes are employed to manage these potential hazards in areas where personnel might be exposed.