Method for positioning low-current grounding fault sections of power distribution networks on basis of transient energy analysis

A small current grounding, transient energy technology, applied in fault location, measurement of electricity, measurement of electrical variables, etc., can solve the problems of difficult identification, additional installation equipment, low fault location accuracy, etc., to achieve simple identification, simplify design and construction. , the effect of clear physical meaning
CN108254657AActive Publication Date: 2018-07-06SHANDONG UNIV +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG UNIV
Publication Date
2018-07-06

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Abstract

The invention discloses a method for positioning low-current grounding fault sections of power distribution networks on the basis of transient energy analysis. The method includes steps of determiningpass frequency band ranges of digital filters and configuring a miniature PMU (power management unit) on each node of the power distribution networks; acquiring zero-sequence voltage phasors and zero-sequence current phasors of the various nodes of the power distribution networks by the aid of the miniature PMUs, judging whether faults of systems occur or not according to the zero-sequence voltage phasors and the zero-sequence current phasors of the various nodes, starting to position the faults if the faults occur, reading three-phase current signals recorded by the various miniature PMUs, computing transient zero-sequence currents of the various nodes by the aid of the three-phase current signals, processing the transient zero-sequence currents, computing transient energy of various sections, and determining the fault sections according to the transient energy of the various sections. The method has the advantages that physical meaning of fault features utilized by the method is clear, the method is high in positioning accuracy and reliability for the fault sections of various branch lines, and input of medium resistors connected with arc suppression coils in parallel or installation of signal injection equipment can be omitted.
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Description

technical field

[0001] The invention belongs to the design field of power line fault location in a power system, and in particular relates to a method for locating a small current grounding fault section of a power distribution network based on transient energy analysis of PMU synchronous data. Background technique

[0002] The neutral point indirect grounding method (the neutral point is not grounded and the neutral point is grounded through the arc suppression coil) is the most important neutral point grounding method in the domestic medium-voltage distribution network, and its single-phase ground fault belongs to the small current ground fault. Single-phase ground faults account for more than 80% of distribution network faults. The steady-state characteristics of low-current ground faults are weak, and the compensation function of arc suppression coils further weakens the fault characteristics.

[0003] At present, fault location methods are immature, mainly including act...

Claims

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