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Arc grounding over-voltage is one of the worst over-voltages in the neutral isolated system. It is an important factor to be considered when selecting neutral ground mode. At present, system simulation is the main method for the study of the arc grounding over-voltage. Arc extinguish and re-ignition is simulated by controlling the switch on or off. However, the switch opening or closing need to be...
In order to study phase-frequency characteristic of zero sequence current after single-phase earth fault in neutral indirectly grounded power system, this paper starts with the line model of distribution network, and analyzes phase-frequency character of zero sequence impedance for distributed parameter line model. By simulation analyzing, for a single feeder, the factors such as transmission line...
Distributed line model should be adopted for Ultra-High-Voltage (UHV) transmission lines, which cause the replacement linear function with hyperbola function between measuring impedance and fault distance for ground impedance relay. The performance of ground impedance relay is sensitive to earth resistance decided by the characteristics of hyperbola function. Then the bad impact of earth resistance...
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