A Line Fault Identification Method Based on Multipoint Active Power Monitoring and Differentiation

Abstract

The invention discloses a method for selecting and locating a power distribution network small current grounding system single-phase ground fault line selection and positioning based on multi-point active power detection and difference. The method mainly comprises: (1) reading active power steady-state data with certain time dimension in sequential and multi-point manner; (2) calculating and processing a differential value of active power steady-state data; (3) selecting a faulty line and locating a fault position according to a data processing result in the step (2). Compared with an existingmodel-based line selection scheme, accuracy of line selection and positioning results does not depend on establishment of a specific physical model. In addition, different from a method using singlepoint measurement as primary in an existing line selection scheme, the multi-point measurement scheme with sequential and certain time dimensions is used, and the method has good applicability to complicated actual situation of a power distribution network. The method is of great significance to solve a problem of small current single-phase ground fault line selection.

Description

technical field [0001] The invention belongs to the field of electrical technology, and more specifically relates to a line fault identification method based on multi-point active power monitoring and differential. Background technique [0002] Most of my country's distribution network adopts the method of small current grounding. The probability of a single-phase ground short circuit can reach about 80%. For such faults, the current main solution to the power grid is "trial shutdown", but this method is inefficient in line selection, and will generate operating overvoltage and resonance overvoltage, causing unnecessary harm to electrical equipment. [0003] At present, there are mainly the following researches on line selection and location of single-phase grounding faults in small current grounding systems: amplitude method and phase method, the maximum method, fifth harmonic component method, zero sequence admittance method, negative sequence current method, injection ...

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to provide a line fault identification method based on multi-point active power monitoring and differential, aiming at solving the problem of single-phase ground fault selection in the prior art due to the complexity of the actual operation of the distribution network. There is a problem of misjudgment in line and positioning

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