Small current grounding fault line selection method based on generalized S transformation transient energy

A small current grounding, transient energy technology, applied in the direction of measuring electricity, fault location, measuring electrical variables, etc., can solve the problem of single-phase grounding faults that are difficult to solve effectively, unstable intermittent arc faults, fault steady state signals Weak and other problems, to achieve the effect of solving the problem of fault location, high time-frequency analysis capability, and good fault location.

Inactive Publication Date: 2020-04-28
HOHAI UNIV
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Problems solved by technology

At the same time, due to the weak and difficult to identify fault steady-state signal, the frequent occurrence of unstable intermittent arc faults, and the complex working environment with noise, it has been difficult to effectively solve the problem of single-phase ground faults.

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  • Small current grounding fault line selection method based on generalized S transformation transient energy
  • Small current grounding fault line selection method based on generalized S transformation transient energy
  • Small current grounding fault line selection method based on generalized S transformation transient energy

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Embodiment Construction

[0039] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and implementations.

[0040] At present, the city's distribution network mainly adopts the line structure of mixed connection of buried cables and overhead lines. Taking Jiangsu Power Grid as an example, the pure overhead distribution lines have gradually decreased, accompanied by the addition of a large number of cable lines, resulting in capacitance The continuous increase of current will inevitably have a great impact on the transient process of small current ground faults in the distribution network. The main impact is that the capacitive current level of the cable line is significantly higher than that of the overhead line, and the noise interference of the cable line is also significantly stronger than that of the overhead line. ...

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Abstract

The invention discloses a small current grounding fault line selection method based on generalized S transformation transient energy. The method comprises the steps that: according to a 10kV line topological graph of a power distribution network, an actual overhead line-cable series-parallel line model and a fixed-value resistance fault model of the power distribution network are built on a PSCADplatform, and single-phase earth fault simulation experiments under various simulation working conditions are carried out; and then generalized S transformation is performed on the acquired transientzero-sequence current at the bus outlet in 1/4 power frequency period after each feeder line fails, generalized S transformation transient energy in a characteristic frequency band is calculated, andthe transient energy of each feeder line is compared so as to adaptively select a faulty line. The method is not influenced by the working conditions such as the fault position, the fault resistance,the line structure and the neutral point grounding mode, the fault line can be accurately selected; and the method has the advantages of being high in practicability, high in accuracy and wide in applicability.

Description

technical field [0001] The invention belongs to the small current grounding fault location technology of distribution network, and in particular relates to a small current grounding fault line selection method based on generalized S-transform transient energy. Background technique [0002] Most of the 10-35kV medium-voltage distribution networks in my country adopt the low-current grounding method. According to statistics, more than 80% of the distribution network faults are single-phase grounding faults. At the same time, due to factors such as the weak and difficult to identify fault steady-state signal, the frequent occurrence of unstable intermittent arc faults, and the complex working environment with noise, it has been difficult to effectively solve the problem of single-phase ground faults. According to the latest "Technical Guidelines for Distribution Networks", the technical principle of single-phase ground fault handling in small current grounding systems has been ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088
Inventor 卫志农毛玥萱殷志华孙国强臧海祥刘雨琦刘玲
Owner HOHAI UNIV
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