Power distribution network overvoltage fault type intelligent identification method and fault identification unit

A fault type and fault identification technology, applied in the direction of testing dielectric strength, etc., can solve problems such as scalability of fault diagnosis items, poor compatibility, single monitoring fault items of power transmission and transformation equipment, and strong dependence on the original manufacturer for transformation and upgrading. Improve real-time performance, improve scalability, and ease of field installation

Pending Publication Date: 2022-03-01
CHANGJI POWER SUPPLY COMPANY STATE GRID XINJIANGELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the poor scalability and compatibility of most of the existing fault diagnosis items, the transformation, upgrading, replication and promotion are highly dependent on the original manufacturers, and it is difficult to realize the Internet of Things interconnection and interoperability of power transmission and transformation equipment through large-scale development so that monitoring An intelligent identification method and a fault identification unit for overvoltage fault types in distribution networks based on the problem of a single fault item

Method used

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  • Power distribution network overvoltage fault type intelligent identification method and fault identification unit
  • Power distribution network overvoltage fault type intelligent identification method and fault identification unit
  • Power distribution network overvoltage fault type intelligent identification method and fault identification unit

Examples

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Embodiment 1

[0055] A method for intelligent identification of overvoltage fault types in a distribution network, comprising the following steps:

[0056] S1: Using the Cassie arc model-based single-phase arc-ground fault simulation model of the neutral point ungrounded system built by the project, the simulated three-phase voltage and current waveform diagrams of the system before and after the arc-ground fault occurred, and extracted voltage and current waveforms for a specific period of time. The first choice is to extract the four fault waveforms of bus three-phase voltage, bus zero-sequence voltage, PT neutral current, and transformer low-voltage side three-phase current. The one-cycle wave before the fault and the two-week wave after the fault are used as input samples;

[0057] S2: Construct the time-frequency matrix of the fault waveform using HHT and band-pass filtering algorithm, where HHT is mainly divided into two parts: EMD and Hilbert transform;

[0058] First, use EMD to dec...

Embodiment 2

[0102] see Figure 2-6 , a distribution network overvoltage fault type intelligent fault identification unit applied to any one of claims 1-5, comprising a fault identification box 1, and further comprising: a fault identification system 2, the fault identification system 2 being installed in the fault identification box 1 internally includes the cable fault detection and fault signal transmission; the cable connection mechanism 3, the cable connection mechanism 3 is installed on the top of the fault identification box 1 for the connection between the cable and the fault identification box 1, so as to realize the movement stability of the fault identification box 1 and Easy to disassemble.

[0103] A layer of rubber shock-absorbing layer is installed inside the fault identification box 1 , the outer cover of the fault identification box 1 is provided with a sealed protection box 4 , and the cable connection mechanism 3 is accommodated inside the sealed protection box 4 .

[0...

Embodiment 3

[0110] see Figure 5-9 , based on Embodiment 2, the difference is that the cable connection mechanism 3 includes a fixed seat 301, the fixed seat 301 is opened in an arc-shaped structure, and an arc-shaped limiting groove 302 is provided inside, and the fixed seat 301 is slid inside. The fixed block 303 with the opening facing upwards, the outer side of the fixed block 303 protrudes and is provided with an arc-shaped stop block 304 embedded in the arc-shaped limit groove 302, and the first fixed ear 305 is welded on the top side of the fixed seat 301, and the fixed block 303 is obliquely provided with a second fixing ear 306 at a position symmetrical to the first fixing ear 305 , and the two fixing seats 301 are center-symmetrically fixed on both sides of the top surface of the fault identification box 1 .

[0111] The middle part of the fixing block 303 of the present invention is a U-shaped groove, which is used for the passage of the cable. The two fixing blocks 303 are res...

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PUM

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Abstract

The invention discloses a power distribution network overvoltage fault type intelligent identification method and a fault identification unit, and belongs to the technical field of overvoltage fault identification. A power distribution network overvoltage fault type intelligent identification method comprises the following steps: establishing a single-phase arc light grounding fault simulation model of a neutral ungrounded system based on a Cassie arc model, and simulating to obtain a three-phase voltage and current oscillogram before and after single-phase grounding before and after a fault; by collecting three-phase voltage, open triangular voltage and primary side neutral point current of a voltage transformer, 11 fault types of metal grounding, arc grounding, medium resistance grounding, high resistance grounding, under / overvoltage, PT disconnection and resonance of different frequencies are identified, the fault type of the system is judged, early warning and suppression are carried out on the degree of harm, and the system reliability is improved. And a movable fault type intelligent fault identification unit is established for the erected cable, so that the device is stable in movement and convenient to disassemble, and can move on the high-voltage cable to carry out multi-point detection so as to realize accurate identification of a fault position.

Description

technical field [0001] The invention relates to the technical field of overvoltage fault identification, in particular to an intelligent identification method and a fault identification unit for an overvoltage fault type of a distribution network. Background technique [0002] At present, domestic research on this aspect is in a state of dispersal, technical standards and transmission protocols among various equipment manufacturers are not uniform, and the development of "isolated chimneys" is serious. Business applications are relatively closed, and their computing, communication, and network capabilities cannot be shared. Most projects have poor scalability and compatibility. Renovation, upgrading, replication, and promotion are highly dependent on the original manufacturer. It is difficult to realize the Internet of Things for power transmission and transformation equipment through large-scale development. interconnection. [0003] Such as single-phase ground fault proce...

Claims

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/12
Inventor 何龙王清彬谭栋赵普志郑义李勇刘刚朱咏明杜龙基宋国栋李志远杨柱石王琛陈立志糟伟红吴伟丽李磊祁鹏刘俊刘勇张国勇
Owner CHANGJI POWER SUPPLY COMPANY STATE GRID XINJIANGELECTRIC POWER
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