Power distribution network ground fault arc extinction control method and system

• Main Authors: FAN BISHUANG, WANG YUFENG, ZHENG NAN, MA HAIHANG
• Format: Patent
• Language: Chinese; English
• Published: 14.12.2021
• Subjects: CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses a power distribution network ground fault arc extinction control method and system. The method comprises the following steps: S1, measuring a three-phase power supply voltage and a neutral point voltage of a power distribution network; S2, judging whether a single-phase earth fault occurs in the power distribution network or not, and if so, entering step S3; otherwise, returning to the step S1; S3, obtaining the fault voltage to ground of the fault phase, the parameters to ground of the power distribution network, the voltage of a neutral point and the three-phase current before and after the fault when the power distribution network breaks down, and calculating the line impedance and the fault grounding resistance of the power distribution network according to the fault voltage to ground of the fault phase, the parameters to ground of the power distribution network, the voltage of the neutral point and the three-phase current before and after the fault; S4, calculating the voltage dro