Low-current grounding fault positioning method and system, monitoring device, equipment and medium

A small current grounding and fault location technology, applied in the field of distribution network, can solve the problems of high frequency of single-phase grounding faults, high requirements for wave recording data, and difficult detection

Active Publication Date: 2020-01-31
SHENZHEN POWER SUPPLY BUREAU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The neutral point of the 10kV and below medium and low voltage distribution network in my country is widely operated without grounding or grounding through the arc suppression coil. On the one hand, when a single-phase (small current) grounding fault occurs, the fault signal is weak and difficult to detect, while single-phase grounding Due to the high frequency of faults, numerous distribution network branches, and random load distribution, the location of small current ground faults has become a major technical problem in distribution network fault handling; , the remote transmission and storage of a large amount of wave recording data have high requirements on the master station and distributed terminals

Method used

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  • Low-current grounding fault positioning method and system, monitoring device, equipment and medium
  • Low-current grounding fault positioning method and system, monitoring device, equipment and medium
  • Low-current grounding fault positioning method and system, monitoring device, equipment and medium

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Embodiment 1

[0050] Embodiment 1 of the present invention proposes a small current grounding fault location method, figure 1 For the flowchart of the method described in embodiment one, refer to figure 1 , the method described in embodiment one comprises the steps:

[0051] Step S1, real-time monitoring of the zero-sequence current mutation at the monitoring point of the line, and when the zero-sequence current mutation at the monitoring point satisfies the preset condition, record the wave to obtain the corresponding fault zero-sequence current data;

[0052] Among them, the preset conditions are:

[0053] Sample the zero-sequence current of the line at the monitoring point according to the preset sampling frequency. If the amplitude of n-1 or more sampling points in n consecutive sampling points satisfies the following formula (2), start wave recording and obtain the corresponding The fault zero-sequence current data and enter step S2, otherwise do not start wave recording, and continu...

Embodiment 2

[0075] Embodiment 2 of the present invention proposes a small current ground fault monitoring device, which is used to implement the steps of the small current ground fault monitoring method described in Embodiment 1 of the present invention, Figure 4 For the frame schematic diagram of the device described in the second embodiment, refer to Figure 4 , the device includes:

[0076] The monitoring and recording unit 1 is used to monitor the zero-sequence current mutation of the line monitoring node in real time, and when the zero-sequence current mutation of the monitoring point meets the preset conditions, record the wave to obtain the corresponding fault zero-sequence current data;

[0077] The node monitoring unit 2 is used to extract the transient quantity of the fault zero-sequence current data, determine the first extreme value point in the transient quantity, and detect a sampling point Q before the extreme value point 0 The slope of;

[0078] Curve fitting unit 3, fo...

Embodiment 3

[0087] Embodiment 3 of the present invention proposes a small current grounding fault location system, Figure 5 For the frame diagram of the system described in embodiment three, refer to Figure 5 , the system includes: a plurality of small current ground fault monitoring devices 100, and a host computer 6; the plurality of monitoring devices are respectively arranged at a plurality of monitoring nodes of the line; the host computer 6 is used to signal to determine the location of the fault. Specifically, the host computer 6 is a master station or a distributed agent terminal, and one host computer 6 corresponds to receiving fault signals from a plurality of monitoring devices 100 .

[0088] in, Figure 6 It is a working flow chart of the small current ground fault location system described in this embodiment.

[0089] Wherein, the host computer is specifically used for: when a positive angle fault occurs, if S i (n)>0, it is judged that the i monitoring point is located...

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Abstract

The invention relates to a low-current grounding fault positioning method and system, a monitoring device, equipment and a medium. The method comprises steps of detecting zero-sequence current abruptchange energy by monitoring points along the line and carrying out starting quickly; recording fault waveforms, AND then, according to opposite characteristics of upstream and downstream transient zero-sequence current mutation directions of a fault point, calculating whether the slope of the previous sampling point of the first extreme point of the zero-sequence current in the low-frequency bandcontaining the power frequency is positive or negative; correspondingly fitting a maximum value point curve or a minimum value point curve in an original signal by adopting cubic spline interpolation;and finally calculating a break variable characteristic value, and carrying out fault positioning according to the break variable characteristic value. The storage medium is a computer readable storage medium, and a computer program used for achieving the reset control method is stored on the storage medium. The equipment includes a processor and a memory storing the computer program, and is capable of implementing the reset control method. According to the invention, rapid fault positioning can be carried out when a small-current grounding system has a single-phase grounding fault.

Description

technical field [0001] The invention relates to the technical field of distribution network, in particular to a small current grounding fault location method and system, a monitoring device, computer equipment, and a computer-readable storage medium. Background technique [0002] The neutral point of the 10kV and below medium and low voltage distribution network in my country is widely operated without grounding or grounding through the arc suppression coil. On the one hand, when a single-phase (small current) grounding fault occurs, the fault signal is weak and difficult to detect, while single-phase grounding Due to the high frequency of faults, numerous distribution network branches, and random load distribution, the location of small current ground faults has become a major technical problem in distribution network fault handling; , the remote transmission and storage of a large amount of wave recording data have high requirements on the master station and distributed term...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/52
CPCG01R31/086G01R31/088Y04S10/52
Inventor 黄福全李国栋董春林刘子俊王廷凰
Owner SHENZHEN POWER SUPPLY BUREAU
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