Distribution network grounding line selection method employing recombination current phase detection

A composite current and grounding line selection technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problem of low accuracy of line selection, and achieve the effects of improved accuracy, simple steps, and reliable actions

Active Publication Date: 2017-08-18
INTEGRATED ELECTRONICS SYST LAB
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Regardless of the method, it has not been successfully applied in the distri

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  • Distribution network grounding line selection method employing recombination current phase detection
  • Distribution network grounding line selection method employing recombination current phase detection
  • Distribution network grounding line selection method employing recombination current phase detection

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[0030] The distribution network grounding line selection method using composite current phase detection, such as figure 1 shown, including the following steps:

[0031] Step 1. Set the number M of outgoing lines of the substation in the database, and number all outgoing lines according to the order of line switch numbers; establish a comparison table of line names, switch numbers, and line sequence numbers n;

[0032] Step 2, set n=1, measure the voltage of the three-phase wiring system of the distribution network, and use the fault recording device to continuously record the three-phase voltage of the busbar and the waveforms of the three-phase current of all outgoing lines. When a ground fault is detected, Start the grounding line selection device to select the grounding line of the distribution network, set n=1; during the voltage measurement process, when it is detected that a certain phase voltage is 0 or the neutral point voltage rises to the phase voltage or the open tr...

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Abstract

The invention relates to a distribution network grounding line selection method employing recombination current phase detection. The distribution network grounding line selection method can determine whether a circuit is connected to the ground through determining whther Phi ALL(A)-PhiD(A)>Eps is established in a first circuit of a grounding fault phase through recording bus three-phase voltage and waveforms of outgoing line three-phase current, wherein the Phi ALL (A) is a phase angle of voltage and current after the grounding fault, Phi D (A) is a power factor angle before the grounding fault ), and Eps is a smallest phase angle difference between the recombination current and load current, if established, determining the circuit is the grounding fault circuit and outputting the name of a faulty line. The distribution network grounding line selection method is simple in process and reliable in action. The fault line selection does not need flinging and cutting outlet switches, and uninterrupted electric line selection can be performed. The distribution network grounding line selection method can fully use the grounding recombination current phase but the obvious surge in an amplitude to correctively determine the faulty line, which greatly improves the working accuracy.

Description

technical field [0001] The invention relates to a distribution network grounding line selection method, in particular to a distribution network grounding line selection method using composite current phase detection. Background technique [0002] Substation distribution network bus has multiple outgoing lines. When a single-phase grounding occurs in a small current grounding system, it can only alarm which phase of the system is grounded, but cannot report which line is grounded. The current commonly used method is to pull each outgoing line successively. When the grounding line is pulled, the grounding alarm signal disappears, so that it is determined that the outgoing line is grounded, and the line can still continue to run. The disadvantage of this method is that the operation is complicated, and it causes short-term power outages for users; especially short-term power outages for non-fault lines. [0003] At present, the fault line selection methods of small current gro...

Claims

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Application Information

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IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 阎有朋
Owner INTEGRATED ELECTRONICS SYST LAB
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