In a system where the low-voltage neutral point of the distribution transformer is not grounded, when a single-phase earth fault occurs, the ground current flows through the grounding device and the earth is spread to the surrounding earth centering on the grounding point. At this time, a surface is formed on the ground surface. Potential distribution area. It is obvious that different locations within the distribution zone have different potentials. In the event of a ground fault in an electrical device such as a switch, when a human hand touches a grounded faulty device casing (or frame, etc.), a potential difference is generated between the human hand and the two legs. This potential difference is called a contact voltage.
If the overhead conductor is broken and the single-phase ground fault occurs, if the person walks around the grounding point (potential distribution area), the two feet are on the ground with different potentials. At this time, the potential difference between the two feet is called stepping. Voltage.
The magnitude of the contact voltage is related to the distance from which the ground fault device leaves the underground grounding body; if it is closer to the grounding body, the contact voltage is smaller; on the contrary, the contact voltage is larger.
The magnitude of the stride voltage is also related to the distance from the grounding body (point); the closer the person stands to the grounding body (point), the more the stride voltage is lacking; the smaller the opposite.
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