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Topologically graphical small-current ground fault route selection method and device

A technology of small current grounding and fault line selection, applied in the field of power systems, can solve problems such as small capacitive current value, interference submersion, misjudgment, etc., and achieve high accuracy and reliable performance

Inactive Publication Date: 2019-08-16
POWER MANAGEMENT CORP OF SHENGLI PETROLEUM ADMINISTATION BUREAU OF CHINA PETROCHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The inventors have found that all of them are currently based on measured values, wherein the measured values ​​include the measured transient or steady-state quantities when a fault occurs. Due to the influence of various disturbances, especially when the system is small or equipped with automatic tuning After the arc suppression coil, the value of the capacitive current is small, and when the arc resistance of the grounding point is unstable, the value of the zero-sequence current or harmonic current is very small, which may be submerged by interference, and its phase may not be correct, resulting in misjudgment

Method used

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  • Topologically graphical small-current ground fault route selection method and device
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  • Topologically graphical small-current ground fault route selection method and device

Examples

Experimental program
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Embodiment 1

[0059] figure 1 A flowchart of a method for line selection for small current grounding faults based on topological graphs in Embodiment 1 is given. Such as figure 1 As shown, the method for line selection of small current grounding faults based on topological graphics in this embodiment includes:

[0060] S101: Collect transient quantities of each power line to obtain transient measurement values ​​of each power line.

[0061] In a specific implementation, the transient quantities of each power line can be collected on-site or remotely.

[0062] It should be noted that the transient quantity can be a current quantity or a voltage quantity, and those skilled in the art can choose to collect according to actual conditions.

[0063] If the transient quantity is the current quantity, the current collection device can be used for on-site collection or remote collection.

[0064] It should be noted that the current collection device includes, but is not limited to, existing curr...

Embodiment 2

[0087] figure 2 A flowchart of a method for line selection for small current grounding faults based on topological graphs in Embodiment 2 is given. Such as figure 2 As shown, the method for line selection of small current grounding faults based on topological graphics in this embodiment includes:

[0088] S201: Collect transient quantities of each power line to obtain transient measurement values ​​of each power line.

[0089] In a specific implementation, the transient quantities of each power line can be collected on-site or remotely.

[0090] It should be noted that the transient quantity can be a current quantity or a voltage quantity, and those skilled in the art can choose to collect according to actual conditions.

[0091] If the transient quantity is the current quantity, the current collection device can be used for on-site collection or remote collection.

[0092] It should be noted that the current collection device includes, but is not limited to, existing cu...

Embodiment 3

[0115] image 3 A flowchart of a method for line selection for small current grounding faults based on topological graphs in Embodiment 3 is given. Such as image 3 As shown, the method for line selection of small current grounding faults based on topological graphics in this embodiment includes:

[0116] S301: Collect the steady-state quantities of each power line, and obtain the measured values ​​of the steady-state quantities of each power line.

[0117] In a specific implementation, the steady-state quantities of each power line can be collected on-site or remotely.

[0118] It should be noted that the steady-state quantity may be a current quantity or a voltage quantity, and those skilled in the art may choose to collect according to actual conditions.

[0119] If the steady-state quantity is the current quantity, the current collection device can be used for on-site collection or remote collection.

[0120] It should be noted that the current collection device includ...

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Abstract

The invention provides a topologically graphical small-current ground fault route selection method and device. The topologically graphical small-current ground fault route selection method comprises the following steps that: collecting the temporary state quantity of each electric power circuit to obtain the temporary state quantity measurement value of each electric power circuit; manually constructing the temporary state quantity, and inputting the manual temporary state quantity into a small-current ground system which has faults; collecting the current temporary state quantity of each electric power circuit in which the temporary state quantity is input, and marking as the temporary state quantity synthesis value of each electric power circuit; and judging the electric power circuit ofwhich the topological graph of the temporary state quantity synthesis value has a W shape as a fault electric power circuit.

Description

technical field [0001] The disclosure belongs to the field of power systems, and in particular relates to a method and device for line selection of small current grounding faults based on topological graphs. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] The current line selection device collects system fault signals in real time, and uses a variety of line selection methods for comprehensive line selection, including: intelligent group amplitude and phase comparison method, harmonic amplitude and phase comparison method, wavelet method, first half-wave method, active power Component method, energy method, zero-sequence current mutation method, etc. Using mathematical tools such as rough set theory to integrate multiple line selection methods together to ensure that the advantages of various line selection methods complement each other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085
Inventor 高志鹏郑志华姚继荣朱玉波丁磊张维进李长杰门利君
Owner POWER MANAGEMENT CORP OF SHENGLI PETROLEUM ADMINISTATION BUREAU OF CHINA PETROCHEM CORP