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Power distribution network permanent fault identification method and system based on coincident one-phase detection

A permanent fault and identification method technology, applied in the direction of fault location, information technology support system, short-circuit test, etc., can solve the problems of weak three-phase coupling, weak transient quantity, and difficult identification of permanent faults in the distribution network, and achieve The effect of reducing misjudgment of the nature of phase-to-phase faults

Pending Publication Date: 2022-08-09
XI AN JIAOTONG UNIV
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Problems solved by technology

[0003] Unlike the transmission network, which has the characteristics of high voltage level, large line-to-ground capacitance, and strong coupling, the three-phase coupling of the distribution network is very weak. After the three-phase trip, the electrical quantity decays rapidly, the transient quantity is weak, and the permanent Difficulty identifying faults

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  • Power distribution network permanent fault identification method and system based on coincident one-phase detection
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  • Power distribution network permanent fault identification method and system based on coincident one-phase detection

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Embodiment Construction

[0051] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0052] In the description of the present invention, it is to be understood that the terms "comprising" and "comprising" indicate the presence of the described features, integers, steps, operations, elements and / or components, but do not exclude one or more other features, The existence or addition of a whole, step, operation, element, component, and / or a collection thereof.

[0053] It should also be understood that the terminology used in the...

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Abstract

The invention discloses a power distribution network permanent fault identification method and system based on one-phase coincidence detection, and the method comprises the steps: presetting a coincidence sequence before three-phase closing of a split-phase switch, and coincidence one phase; for a single-phase grounding fault, a two-phase grounding fault and a three-phase grounding fault, selecting a switching-on power frequency voltage signal, calculating a line voltage between a switching-on phase and a fault phase, obtaining a phase difference theta between the line voltage and a switching-on phase voltage, and determining that the fault is a permanent fault when the phase difference theta meets a set condition; for inter-phase faults, the line voltage between two non-closed phases is calculated, the effective value of the transient state quantity of the filtered line voltage is calculated, when the transient state quantity of the line voltage is larger than a setting value, the fault is permanent, and otherwise, the fault is instantaneous. According to the method, the fault property identification is realized by utilizing the split-phase switch and adopting a split-phase overlapping mode, and the method can be suitable for a scene without a current transformer only by utilizing voltage characteristics.

Description

technical field [0001] The invention belongs to the technical field of distribution network fault identification, and in particular relates to a method and system for identifying permanent faults in a distribution network for detection of coincidence and one-phase detection. Background technique [0002] The automatic reclosing device is generally used in the distribution network. After the fault occurs, the automatic closing device is automatically closed after a delay. When a permanent fault occurs, it is generally necessary to realize the location and isolation of the fault section through multiple reclosing, affecting the fault point. Power supply to downstream sound sections. In addition, automatic reclosing is generally not used in the cable network, but the on-site operation finds that the cable network also has a certain probability of transient faults. When the reclosing is abandoned, the reliability of the power supply will be reduced. The above problems can be ef...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088G01R31/52Y04S10/52
Inventor 常仲学李浩宋国兵张维张晨浩
Owner XI AN JIAOTONG UNIV
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