Small current grounding fault line selection method

A technology of small current grounding and fault line selection, which is applied to the fault location, detects faults according to conductor types, and measures electricity. It can solve problems such as uncertain disturbance signals and interference noise signals, and achieve improved signal-to-noise ratio and accuracy. , Highlight the effect of fault characteristics

Pending Publication Date: 2022-01-14
STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO
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Problems solved by technology

[0006] The present invention proposes a line selection method for small current grounding faults, and its purpose is to solve the problem that the line selection of singl

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  • Small current grounding fault line selection method
  • Small current grounding fault line selection method
  • Small current grounding fault line selection method

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Embodiment 1

[0072] In order to make the objectives, technical solutions, and advantages of the present invention, the present invention will be described in detail below in connection with the embodiments; .

[0073] like figure 1 As shown as a fault line method for morphological filtering and empirical modal decomposition, combined figure 2 The small and medium current grounding system, the method of practical implementation of the method of the present invention, the steps are as follows:

[0074] 1. Real-time acquisition substation 10KV / 20KV / 35KV bus three-phase voltage value ua, ub, uc and zero-sequence voltage value of 3U 0 When the bus voltage occurs, the phase voltage amplitude is less than or equal to 0.7 multiplie voltage, and the other two phase voltage is greater than or equal to the 1.2 times phase voltage; or the intelligent scheduling control system 10kv / 20 kV / 35KV bus ground alarm signal operation, it is determined as a single Fault; at this time, the filtering device i...

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Abstract

The invention provides a small current grounding fault line selection method. The method comprises the following steps: 1, collecting a bus three-phase voltage value and a bus zero sequence voltage; 2, judging whether a single-phase earth fault occurs or not; 3, if the single-phase earth fault does not occur, returning to the step 1, and if so, starting a wave recording device; 4, starting the wave recording device to record fault data of one cycle after an event node; 5, carrying out singularity detection on the zero sequence voltage value 3U0 of the bus by adopting a Hilbert-Huang transform technology, and confirming the fault moment of the power distribution network; 6, performing SVD filtering on the transient zero-sequence current of each outgoing line; 7, performing morphological filtering on the transient zero-sequence current of each outgoing line; 8, performing empirical mode decomposition on the transient zero-sequence current of each outgoing line and constructing a mode matrix; 9, processing the modal matrix by using a singular value decomposition technology and constructing a fault eigenvalue matrix; and 10, extracting characteristic values by adopting a PSO-FCM clustering technology to judge a fault line.

Description

Technical field [0001] The present invention relates to a small current ground fault line method, which belongs to the field of relay network relay protection. Background technique [0002] my country's distribution network neutral point is mainly excited or not grounded, and after the single-phase ground is occurred, since the grounding line failure characteristics are not obvious, the single-phase ground fault line is added; the existing fault line The means comprises artificial pull mode, and it is judged that the composed transient zero-modulus mode and conventional substation grounding option, these ground options have certain uncertainty and randomness during practical application, and even Operational overvoltage generated during artificial pull will affect power distribution equipment. [0003] Hilbert-Huang Transform (HHT) provides new ideas for single-phase fault option, HHT transform, nonlinear non-stationary signal capability, significant advantage; the core of HHT tr...

Claims

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Application Information

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IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088G01R31/52
Inventor 周云巴宇马海薇马海涛张佳赵肖旭侯超吴林朱江渝冯珊珊耿玲娜
Owner STATE GRID JIANGSU ELECTRIC POWER CO ZHENJIANG POWER SUPPLY CO
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