Power distribution network single-phase grounding fault judging and locating method

Abstract

The invention discloses a power distribution network single-phase grounding fault judging and locating method which mainly achieves accurate and quick judging of a fault section when a single-phase grounding fault occurs in a power distribution network. The power distribution network single-phase grounding fault judging and locating method comprises the following steps that a section switch is arranged on a circuit of the power distribution network, power distribution automation feeder line terminals are arranged on the section switch and network communication is established among the power distribution automation feeder line terminals; the power distribution automation feeder line terminals judge the circuit single-phase grounding fault and the s that a single-phase grounding fault point is located at a section adjacent to the section switch where the power distribution automation feeder line terminals are located. Compared with the prior art, the single-phase grounding fault is judged and detected through the power distribution automation feeder line terminals, network communication is established among all the power distribution automation feeder line terminals, fault judgment information is interacted among the power distribution automation feeder line terminals, the specific position of the fault point is determined, therefore, the fault region can be determined quickly, the fault processing time can be shortened and the power supply reliability can be improved.

Description

technical field [0001] The invention relates to a method for judging a distribution network fault, in particular to a method for judging and locating a single-phase grounding fault. Background technique [0002] Most of my country's 10kV distribution automation systems (distribution networks, systems) are neutral point ungrounded systems or neutral point grounding systems through arc suppression coils. When a single-phase grounding fault occurs, the current at the fault point is very small, and The line voltage between the three phases is still symmetrical and has no effect on the power supply of the load, so the regulations stipulate that it can continue to operate for 1 to 2 hours without immediate tripping. However, after the single-phase ground fault occurs, the sound phase voltage should increase In some cases, the grounding capacitance current may cause arcing over the fault point, instantaneous overvoltage, resulting in insulation breakdown, and further develop into ...

AI Technical Summary

Problems solved by technology

However, the lines of the distribution network are intricate, and some lines are tens of kilometers long;

Once a fault occurs on an overhead line, it is difficult to find it, especially when a single-phase grounding occurs on the line. Because the fault point is difficult to determine, the time to deal with the accident is often delayed, causing the fault to expand and further develop into a short circuit between phases, or damage to electrical equipment.

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