askelejännitteet

Askellujännitteet, often translated as step voltages, refer to the potential difference that can exist between two points on the surface of the ground or a structure when an electric current flows through the earth. This phenomenon is typically associated with situations involving high currents, such as lightning strikes, faults in high-voltage power systems, or the operation of cathodic protection systems. The current flowing through the earth encounters resistance, leading to a voltage gradient. If a person or animal has their feet separated by a distance, they will be standing on points of different potential, resulting in a voltage difference across their body. This voltage difference can cause a current to flow through their body, which is known as step voltage. The magnitude of the step voltage depends on the magnitude of the current, the resistivity of the soil, and the spacing between the feet. In areas where high currents are present, such as near substations or transmission towers, warning signs are often posted to alert people to the potential hazard of step voltages. If a person encounters a situation with significant step voltage, they should try to minimize the distance between their feet or jump with both feet together to reduce the voltage difference across their body.