A method of removing the source of circuit fault

Abstract

The invention discloses a circuit fault source removing method which includes the following steps: S1, a backup three-phase line is connected in parallel to an original three-phase line; S2, a plurality of nodes are broken at equal intervals on the three-phase line between three-phase circuit breakers at the head and tail ends, and three pairs of electrical connection ends are led out from each node; S3, whether there is a single-phase grounding fault in the three-phase lines is judged, the three-phase line having a single-phase grounding fault and the faulty phase are judged, and the three-phase circuit breakers at the two ends of the faulty three-phase line are disconnected; S4, current signals between the electrical connection ends of the faulty phase on each node and the correspondingphase of the other three-phase line are continuously collected, and the position of the fault source is judged; S5, the nodes on the two sides of the faulty phase where the fault source is located aredisconnected, the faulty phases on the two sides of the disconnected nodes are conductively connected, and the fault source is removed from the phases; and S6, the three-phase circuit breakers at thetwo ends of the faulty three-phase line are closed. The method can ensure stable and continuous operation of the grid system.

Description

technical field [0001] The invention relates to an intelligent detection system, more specifically, the invention relates to a method for removing a circuit fault source. Background technique [0002] Single-phase grounding is a single-phase grounding of 10kV (35kV) small current grounding system. Single-phase grounding fault is the most common fault in power distribution system, which mostly occurs in humid and rainy weather. It is caused by many factors such as tree barriers, single-phase breakdown of insulators on distribution lines, single-phase disconnection, and small animal hazards. Single-phase grounding not only affects the normal power supply of users, but also may generate overvoltage, burn out equipment, and even cause phase-to-phase short circuit to expand accidents. [0003] In actual operation, the plastic cloth of the brick factory fell onto the wires due to strong winds, causing the voltage transformers of the substation to burn out, causing equipment damag...

AI Technical Summary

Problems solved by technology

Single-phase grounding not only affects the normal power supply of users, but also may generate overvoltage, burn out equipment, and even cause phase-to-phase short circuit to expand accidents

[0003] In actual operation, the plastic cloth of the brick factory fell onto the wires due to strong winds, causing the voltage transformers of the substation to burn out, causing equipment damage and large-scale power outages

After a single-phase ground fault occurs, resonant overvoltage may also occur, which may be several times higher than the normal voltage, endangering the insulation of the substation equipment, and in severe cases, the insulation breakdown of the substation equipment may cause a greater accident

[0004] After a single-phase grounding fault occurs, intermittent arcing grounding may occur, resulting in resonant overvoltage and overvoltage several times higher than the normal voltage. The overvoltage will further cause insulation breakdown of the insulator on the line, resulting in a serious short circuit accident. Burn down part of the distribution transformer, cause the lightning arrester and fuse insulation on the line to break down and burn out, and electrical fires may also occur

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