CN110133446B - Topological graphical low-current ground fault line selection method and device - Google Patents
Topological graphical low-current ground fault line selection method and device Download PDFInfo
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- CN110133446B CN110133446B CN201910505971.4A CN201910505971A CN110133446B CN 110133446 B CN110133446 B CN 110133446B CN 201910505971 A CN201910505971 A CN 201910505971A CN 110133446 B CN110133446 B CN 110133446B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
Abstract
The disclosure provides a topological graphical low-current ground fault line selection method and device. The topological graphical low-current ground fault line selection method comprises the following steps: collecting the transient state quantity of each power line to obtain the transient state quantity measured value of each power line; artificially constructing a transient quantity, and putting the artificially constructed transient quantity into a low-current grounding system with a fault; collecting the current transient state quantity of each power line which is put into artificially constructed transient state quantity, and recording the current transient state quantity as the composite value of the transient state quantity of each power line; and judging that the power line with the W shape in the topological graph of the transient component composite value is a fault power line.
Description
Technical Field
The disclosure belongs to the field of power systems, and particularly relates to a topological graphical low-current ground fault line selection method and device.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The current line selection device collects system fault signals in real time and carries out comprehensive line selection by applying various line selection methods, and the method specifically comprises the following steps: an intelligent population amplitude-to-amplitude phase comparison method, a harmonic amplitude-to-amplitude phase comparison method, a wavelet method, a first half wave method, a power component method, an energy method, a zero-sequence current mutation method and the like. A plurality of line selection methods are fused together by using mathematical tools such as a rough set theory and the like, and the advantage complementation among the line selection methods is ensured to the maximum extent.
The inventor finds that, at present, the measured values include transient state quantity or steady state quantity when a fault is detected, and due to the influence of various interferences, especially when the system is small or an automatic tuning arc suppression coil is additionally arranged, the capacitance current value is small, and the arc resistance of the grounding point is unstable, the zero sequence current or harmonic current value is small and may be submerged by the interferences, and the phase of the zero sequence current or harmonic current value is not necessarily correct, thereby causing misjudgment.
Disclosure of Invention
In order to solve the above problems, a first aspect of the present disclosure provides a topological-patterned low-current ground fault line selection method, which generates a topological graph by using the magnitude of a fault transient quantity or a steady-state quantity that is manually controlled, and determines a faulty power line by using the graph, thereby improving the anti-interference capability and the accuracy of determination.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
in one or more embodiments, a topographically patterned low current ground fault line selection method includes:
collecting the transient state quantity of each power line to obtain the transient state quantity measured value of each power line;
artificially constructing a transient quantity, and putting the artificially constructed transient quantity into a low-current grounding system with a fault;
collecting the current transient state quantity of each power line which is put into artificially constructed transient state quantity, and recording the current transient state quantity as the composite value of the transient state quantity of each power line;
and judging that the power line with the W shape in the topological graph of the transient component composite value is a fault power line.
In one or more embodiments, a topographically patterned low current ground fault line selection method includes:
collecting the transient state quantity of each power line to obtain the transient state quantity measured value of each power line;
artificially constructing a transient quantity, and cutting off the artificially constructed transient quantity from a low-current grounding system with a fault;
collecting the current transient state quantity of each power line from which the artificially constructed transient state quantity is cut, and recording the current transient state quantity as the transient state quantity composite value of each power line;
and judging that the power line with the W shape in the topological graph of the transient component composite value is a fault power line.
As an implementation manner, a topological-patterned low-current ground fault line selection method further includes:
and the magnitude of the transient component composite value is adjusted by multiplying the correlation coefficient by the artificially constructed transient component, so that the transient component composite value is in a preset range.
The technical scheme has the advantages that when the transient quantity of the collected faults exceeds the minimum set threshold value, the transient quantity can be increased through manual control; when the transient state quantity of the collected faults exceeds the maximum preset threshold value, the transient state quantity can be reduced through manual control, the transient state quantity of new faults is controlled within a preset range, a topological graph is generated, and the power line with the faults is judged through the graph, so that the performance is reliable, and the accuracy is high.
In one or more embodiments, a topographically patterned low current ground fault line selection method includes:
collecting the steady state quantity of each power line to obtain the steady state quantity measured value of each power line;
artificially constructing a steady state quantity, and putting the artificially constructed steady state quantity into a low-current grounding system with a fault;
collecting the current steady state quantity of each power line which is put into artificially constructed steady state quantity, and recording the current steady state quantity as the steady state quantity composite value of each power line;
and judging that the power line with the W shape in the topological graph of the steady-state quantity composite value is a fault power line.
In one or more embodiments, a topographically patterned low current ground fault line selection method includes:
collecting the steady state quantity of each power line to obtain the steady state quantity measured value of each power line;
artificially constructing a steady state quantity, and cutting off the artificially constructed steady state quantity from a low-current grounding system with a fault;
collecting the current steady state quantity of each power line from which the artificially constructed steady state quantity is cut, and recording the current steady state quantity as the steady state quantity synthetic value of each power line;
and judging that the power line with the W shape in the topological graph of the steady-state quantity composite value is a fault power line.
As an implementation manner, a topological-patterned low-current ground fault line selection method further includes:
and the correlation coefficient is multiplied by the artificially constructed steady-state quantity to adjust the magnitude of the steady-state quantity composite value, so that the steady-state quantity composite value is in a preset range.
The technical scheme has the advantages that when the collected fault steady-state quantity exceeds the minimum set threshold value, the steady-state quantity can be increased through manual control; when the collected steady state quantity of the fault exceeds the maximum preset threshold value, the steady state quantity which can be artificially controlled is reduced, the steady state quantity of the new fault is controlled within a preset range, a topological graph is generated, and the power line with the fault is judged through the graph, so that the performance is reliable, and the accuracy is high.
In order to solve the above problems, a second aspect of the present disclosure provides a topological-patterned low-current ground fault line selection apparatus, which generates a topological graph according to the magnitude of a fault transient quantity or a steady-state quantity that is manually controlled, and determines a faulty power line according to the graph, thereby improving the anti-interference capability and the determination accuracy.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
a topological graphical low-current ground fault line selection device comprises:
the fault data acquisition unit is used for acquiring the transient quantity or the steady-state quantity of each power line to obtain a transient quantity measured value or a steady-state quantity measured value of each power line;
an artificial data setting unit for artificially constructing a steady-state quantity or a steady-state quantity;
the artificial data switching unit is used for switching artificially constructed transient state quantity or steady state quantity into the low-current grounding system with the fault or cutting the artificially constructed transient state quantity or steady state quantity from the low-current grounding system with the fault;
the combined value data acquisition unit is used for acquiring current transient quantity or current steady-state quantity of each power line which invests or cuts artificially constructed transient quantity or steady-state quantity, and recording the current transient quantity or current steady-state quantity as a transient quantity combined value or a steady-state quantity combined value of each power line;
and a fault line selection unit for determining that the power line in which the W shape appears in the topological graph of the transient quantity composite value or the steady-state quantity composite value is a fault power line.
As an embodiment, the artificial data setting unit is further configured to:
and the magnitude of the transient state quantity composite value or the steady state quantity composite value is adjusted by multiplying the correlation coefficient by the artificially constructed transient state quantity or the artificially constructed steady state quantity, so that the transient state quantity composite value or the steady state quantity composite value is in a preset range.
The technical scheme has the advantages that when the transient state quantity or the steady state quantity of the collected fault exceeds the minimum set threshold value, the transient state quantity or the steady state quantity can be increased through manual control; when the collected transient state quantity or steady state quantity of the fault exceeds the maximum preset threshold value, the transient state quantity or steady state quantity which can be artificially controlled is reduced, the transient state quantity or steady state quantity of the new fault is controlled within a preset range, a topological graph is generated, and the power line with the fault is judged through the graph, so that the performance is reliable, and the accuracy is high.
As an implementation mode, the artificial data switching unit is a high-voltage vacuum contactor or a high-voltage circuit breaker.
The technical scheme has the advantages that the artificial value is input into the low-current grounding system with the fault or cut off from the low-current grounding system with the fault through the high-voltage vacuum contactor or the high-voltage circuit breaker, so that the efficiency and the accuracy of the artificial value input or cut-off are improved, and a foundation is laid for improving the accuracy of fault line selection.
The beneficial effects of this disclosure are:
(1) according to the method, the artificially constructed steady state quantity or steady state quantity is overlapped with the collected transient state quantity or steady state quantity of each power line to generate the transient state quantity synthetic value or steady state quantity synthetic value of each power line, and the power line with the W shape is judged as the power line with the fault by judging whether the W shape appears in the topological graph of the transient state quantity synthetic value or steady state quantity synthetic value.
(2) When the transient state quantity or the steady state quantity of the fault is collected to exceed the minimum set threshold value, the transient state quantity or the steady state quantity controlled manually is increased; when the collected transient state quantity or steady state quantity of the fault exceeds the maximum preset threshold value, the transient state quantity or steady state quantity controlled manually is reduced, the new transient state quantity or steady state quantity of the fault is controlled within a preset range, and the method is reliable in performance and high in accuracy.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a flowchart of an embodiment 1 of a topological-patterned low-current ground fault line selection method provided by the present disclosure.
Fig. 2 is a flowchart of an embodiment 2 of a topological-patterned low-current ground fault line selection method provided by the present disclosure.
Fig. 3 is a flowchart of an embodiment 3 of a topological-patterned low-current ground fault line selection method provided by the present disclosure.
Fig. 4 is a flowchart of an embodiment 4 of a topological-patterned low-current ground fault line selection method provided by the present disclosure.
Fig. 5 is a schematic structural diagram of an embodiment of a topological-patterned low-current ground fault line selection device provided by the present disclosure.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example 1
Fig. 1 shows a flowchart of a topological-graphical low-current ground fault line selection method of embodiment 1. As shown in fig. 1, the topology-patterned low-current ground fault line selection method of this embodiment includes:
s101: and collecting the transient state quantity of each power line to obtain the transient state quantity measured value of each power line.
In implementations, the transient amount of each power line may be collected on-site or remotely.
It should be noted that the transient amount may be an amount of current or an amount of voltage, and those skilled in the art can select the acquisition according to actual situations.
If the transient quantity is the current quantity, a current collecting device can be adopted for field collection or remote collection.
It should be noted that the current collecting device includes, but is not limited to, a current transformer and the like which are used in current collecting equipment in the prior art.
If the transient state quantity is a voltage quantity, a voltage acquisition device can be adopted for field acquisition or remote acquisition.
It should be noted that the voltage collecting device includes, but is not limited to, a voltage transformer and the like which are used in the current collecting device in the prior art.
S102: artificially constructing transient quantity, and putting the artificially constructed transient quantity into a low-current grounding system with a fault.
Specifically, the artificially constructed transient is a known quantity.
It should be noted that the transient amount may be a current amount or a voltage amount, and is consistent with the transient amount in step S101.
After the transient state quantity is artificially constructed, the artificially constructed transient state quantity can be put into a low-current grounding system with a fault through the high-voltage vacuum contactor.
S103: and collecting the current transient state quantity of each power line which is put into artificially constructed transient state quantity, and recording the current transient state quantity as the transient state quantity composite value of each power line.
In the specific implementation, the magnitude of the transient composite value is adjusted by multiplying the artificially constructed transient by the correlation coefficient, so that the transient composite value is within the preset range.
When the transient state quantity of the collected faults exceeds the minimum set threshold value, the transient state quantity can be increased through manual control; when the transient state quantity of the collected faults exceeds the maximum preset threshold value, the transient state quantity can be reduced through manual control, the transient state quantity of new faults is controlled within a preset range, a topological graph is generated, and the power line with the faults is judged through the graph, so that the performance is reliable, and the accuracy is high.
Specifically, the transient state quantity of the fault acquired on site or remotely is superposed with the artificially constructed transient state quantity, and the calculation formula of the transient state quantity composite value is as follows:
F＝(A+x)-(kB+x)
F＝A-kB
in the formula:
a: a transient measurement value, referred to as a measurement value for short, of a power line with a fault;
x: the disturbance amount of the system;
b: artificially constructed transient quantity, which is called artificial value for short;
k: a correlation coefficient;
and F, transient state quantity after the measured value and the artificial value are operated, which is called composite value for short.
The formula of the transient component composite value can show that: the composite value of the transient state quantity is not influenced by the disturbance quantity of the system, and the fault power line can be accurately judged through the composite value of the transient state quantity.
S104: and judging that the power line with the W shape in the topological graph of the transient component composite value is a fault power line.
The topological graph of the transient component composite value is displayed in a W shape on the background of the computer to obtain an intuitive image, the computer obtains the power line with the ground fault according to the W-shaped topological graph or obtains the power line with the ground fault through manual observation, and the topological-graphical low-current ground fault line selection is realized.
Example 2
Fig. 2 is a flowchart of a topological-graphical low-current ground fault line selection method according to embodiment 2. As shown in fig. 2, the topology-patterned small-current ground fault line selection method of this embodiment includes:
s201: and collecting the transient state quantity of each power line to obtain the transient state quantity measured value of each power line.
In implementations, the transient amount of each power line may be collected on-site or remotely.
It should be noted that the transient amount may be an amount of current or an amount of voltage, and those skilled in the art can select the acquisition according to actual situations.
If the transient quantity is the current quantity, a current collecting device can be adopted for field collection or remote collection.
It should be noted that the current collecting device includes, but is not limited to, a current transformer and the like which are used in current collecting equipment in the prior art.
If the transient state quantity is a voltage quantity, a voltage acquisition device can be adopted for field acquisition or remote acquisition.
It should be noted that the voltage collecting device includes, but is not limited to, a voltage transformer and the like which are used in the current collecting device in the prior art.
S202: and artificially constructing a transient quantity, and cutting off the artificially constructed transient quantity from the low-current grounding system with the fault.
Specifically, the artificially constructed transient is a known quantity.
It should be noted that the transient amount may be a current amount or a voltage amount, and is consistent with the transient amount in step S201.
After the transient state quantity is artificially constructed, the artificially constructed transient state quantity can be cut off from the low-current grounding system with faults through the high-voltage circuit breaker.
S203: and collecting the current transient state quantity of each power line for cutting off the artificially constructed transient state quantity, and recording the current transient state quantity as the transient state quantity composite value of each power line.
In the specific implementation, the magnitude of the transient composite value is adjusted by multiplying the artificially constructed transient by the correlation coefficient, so that the transient composite value is within the preset range.
When the transient state quantity of the collected faults exceeds the minimum set threshold value, the transient state quantity can be increased through manual control; when the transient state quantity of the collected faults exceeds the maximum preset threshold value, the transient state quantity can be reduced through manual control, the transient state quantity of new faults is controlled within a preset range, a topological graph is generated, and the power line with the faults is judged through the graph, so that the performance is reliable, and the accuracy is high.
Specifically, the transient state quantity of the fault acquired on site or remotely is superposed with the artificially constructed transient state quantity, and the calculation formula of the transient state quantity composite value is as follows:
F＝(A+x)-(kB+x)
F＝A-kB
in the formula:
a: a transient measurement value, referred to as a measurement value for short, of a power line with a fault;
x: the disturbance amount of the system;
b: artificially constructed transient quantity, which is called artificial value for short;
k: a correlation coefficient;
and F, transient state quantity after the measured value and the artificial value are operated, which is called composite value for short.
The formula of the transient component composite value can show that: the composite value of the transient state quantity is not influenced by the disturbance quantity of the system, and the fault power line can be accurately judged through the composite value of the transient state quantity.
S204: and judging that the power line with the W shape in the topological graph of the transient component composite value is a fault power line.
The topological graph of the transient component composite value is displayed in a W shape on the background of the computer to obtain an intuitive image, the computer obtains the power line with the ground fault according to the W-shaped topological graph or obtains the power line with the ground fault through manual observation, and the topological-graphical low-current ground fault line selection is realized.
Example 3
Fig. 3 is a flowchart of a topological-graphical low-current ground fault line selection method according to embodiment 3. As shown in fig. 3, the topology-patterned small-current ground fault line selection method of this embodiment includes:
s301: and collecting the steady-state quantity of each power line to obtain the steady-state quantity measured value of each power line.
In implementations, the steady state quantities of each power line may be collected on-site or remotely.
It should be noted that the steady-state quantity may be a current quantity or a voltage quantity, and those skilled in the art can select collection from a row according to actual situations.
If the steady-state quantity is the current quantity, the current collecting device can be used for field collection or remote collection.
It should be noted that the current collecting device includes, but is not limited to, a current transformer and the like which are used in current collecting equipment in the prior art.
If the steady state quantity is a voltage quantity, a voltage acquisition device can be adopted for field acquisition or remote acquisition.
It should be noted that the voltage collecting device includes, but is not limited to, a voltage transformer and the like which are used in the current collecting device in the prior art.
S302: and artificially constructing a steady state quantity, and putting the artificially constructed steady state quantity into a low-current grounding system with a fault.
Specifically, the artificially constructed steady-state quantity is a known quantity.
Note that the steady-state amount may be an amount of current or an amount of voltage, and coincides with the steady-state amount in step S301.
After the steady state quantity is artificially constructed, the artificially constructed steady state quantity can be put into a low-current grounding system with a fault through the high-voltage vacuum contactor.
S303: and collecting the current steady-state quantity of each power line which is put into the artificially constructed steady-state quantity, and recording the current steady-state quantity as the steady-state quantity composite value of each power line.
In specific implementation, the magnitude of the steady-state quantity composite value is adjusted by multiplying the correlation coefficient by the artificially constructed steady-state quantity, so that the steady-state quantity composite value is within a preset range.
When the collected steady-state quantity of the fault exceeds the minimum set threshold value, the steady-state quantity can be increased through manual control; when the collected steady state quantity of the fault exceeds the maximum preset threshold value, the steady state quantity which can be artificially controlled is reduced, the steady state quantity of the new fault is controlled within a preset range, a topological graph is generated, and the power line with the fault is judged through the graph, so that the performance is reliable, and the accuracy is high.
Specifically, the steady state quantity of the fault acquired on site or remotely is superposed with the artificially constructed steady state quantity, and the calculation formula of the steady state quantity composite value is as follows:
F′＝(A′+x)-(kB′+x)
F′＝A′-kB′
in the formula:
a': the steady state quantity measured value of the power line with the fault is called measured value for short;
x: the disturbance amount of the system;
b': artificially constructed steady state quantities, referred to as artificial values for short;
k: a correlation coefficient;
and F' is a steady state quantity after the measured value and the artificial value are operated, which is called a composite value for short.
The formula of the steady state quantity composite value can show that: the steady state quantity composite value is not influenced by the disturbance quantity of the system, and the fault power line can be accurately judged through the steady state quantity composite value.
S304: and judging that the power line with the W shape in the topological graph of the steady-state quantity composite value is a fault power line.
The topological graph of the stable state quantity composite value is displayed in a W shape on the background of the computer to obtain an intuitive image, the computer obtains the power line with the ground fault according to the W-shaped topological graph or obtains the power line with the ground fault through manual observation, and the line selection of the topological graphical low-current ground fault is realized.
Example 4
Fig. 4 is a flowchart of a topological-graphical low-current ground fault line selection method according to embodiment 4. As shown in fig. 4, the topology-patterned small-current ground fault line selection method of this embodiment includes:
s401: collecting the steady state quantity of each power line to obtain the steady state quantity measured value of each power line;
in implementations, the steady state quantities of each power line may be collected on-site or remotely.
It should be noted that the steady-state quantity may be a current quantity or a voltage quantity, and those skilled in the art can select collection from a row according to actual situations.
If the steady-state quantity is the current quantity, the current collecting device can be used for field collection or remote collection.
It should be noted that the current collecting device includes, but is not limited to, a current transformer and the like which are used in current collecting equipment in the prior art.
If the steady state quantity is a voltage quantity, a voltage acquisition device can be adopted for field acquisition or remote acquisition.
It should be noted that the voltage collecting device includes, but is not limited to, a voltage transformer and the like which are used in the current collecting device in the prior art.
S402: artificially constructing a steady state quantity, and cutting off the artificially constructed steady state quantity from a low-current grounding system with a fault;
specifically, the artificially constructed steady-state quantity is a known quantity.
Note that the steady-state amount may be an amount of current or an amount of voltage, and coincides with the steady-state amount in step S401.
After the steady state quantity is artificially constructed, the artificially constructed steady state quantity can be cut off from a small current grounding system with faults through a high-voltage vacuum contactor or a breaker.
S403: collecting the current steady state quantity of each power line from which the artificially constructed steady state quantity is cut, and recording the current steady state quantity as the steady state quantity synthetic value of each power line;
in specific implementation, the magnitude of the steady-state quantity composite value is adjusted by multiplying the correlation coefficient by the artificially constructed steady-state quantity, so that the steady-state quantity composite value is within a preset range.
When the collected steady-state quantity of the fault exceeds the minimum set threshold value, the steady-state quantity can be increased through manual control; when the collected steady state quantity of the fault exceeds the maximum preset threshold value, the steady state quantity which can be artificially controlled is reduced, the steady state quantity of the new fault is controlled within a preset range, a topological graph is generated, and the power line with the fault is judged through the graph, so that the performance is reliable, and the accuracy is high.
Specifically, the steady state quantity of the fault acquired on site or remotely is superposed with the artificially constructed steady state quantity, and the calculation formula of the steady state quantity composite value is as follows:
F′＝(A′+x)-(kB′+x)
F′＝A′-kB′
in the formula:
a': the steady state quantity measured value of the power line with the fault is called measured value for short;
x: the disturbance amount of the system;
b': artificially constructed steady state quantities, referred to as artificial values for short;
k: a correlation coefficient;
and F' is a steady state quantity after the measured value and the artificial value are operated, which is called a composite value for short.
The formula of the steady state quantity composite value can show that: the steady state quantity composite value is not influenced by the disturbance quantity of the system, and the fault power line can be accurately judged through the steady state quantity composite value.
S404: and judging that the power line with the W shape in the topological graph of the steady-state quantity composite value is a fault power line.
The topological graph of the stable state quantity composite value is displayed in a W shape on the background of the computer to obtain an intuitive image, the computer obtains the power line with the ground fault according to the W-shaped topological graph or obtains the power line with the ground fault through manual observation, and the line selection of the topological graphical low-current ground fault is realized.
Example 5
As shown in fig. 5, a topology-patterned low-current ground fault line selection apparatus of this embodiment includes:
(1) the fault data acquisition unit is used for acquiring the transient quantity or the steady-state quantity of each power line to obtain a transient quantity measured value or a steady-state quantity measured value of each power line;
(2) an artificial data setting unit for artificially constructing a steady-state quantity or a steady-state quantity;
specifically, the artificial data setting unit is further configured to:
and the magnitude of the transient state quantity composite value or the steady state quantity composite value is adjusted by multiplying the correlation coefficient by the artificially constructed transient state quantity or the artificially constructed steady state quantity, so that the transient state quantity composite value or the steady state quantity composite value is in a preset range.
When the transient state quantity or the steady state quantity of the collected fault exceeds the minimum set threshold value, the transient state quantity or the steady state quantity controlled manually is increased; when the collected transient state quantity or steady state quantity of the fault exceeds the maximum preset threshold value, the transient state quantity or steady state quantity controlled manually is reduced, the new transient state quantity or steady state quantity of the fault is controlled within a preset range, and the method is reliable in performance and high in accuracy.
(3) And the artificial data switching unit is used for switching artificially constructed transient state quantity or steady state quantity into the low-current grounding system with the fault or cutting the artificially constructed transient state quantity or steady state quantity from the low-current grounding system with the fault.
In this embodiment, the artificial data switching unit switches the capacitor for the high-voltage vacuum contactor, so as to generate a synthetic value.
It should be noted that the artificial data switching unit may also adopt a high-voltage vacuum contactor or a high-voltage circuit breaker or other existing control devices to implement the artificial transient or steady state quantity input into the low-current grounding system with the fault, or to remove the artificial transient or steady state quantity from the low-current grounding system with the fault.
(4) The combined value data acquisition unit is used for acquiring current transient quantity or current steady-state quantity of each power line which invests or cuts artificially constructed transient quantity or steady-state quantity, and recording the current transient quantity or current steady-state quantity as a transient quantity combined value or a steady-state quantity combined value of each power line;
(5) and a fault line selection unit for determining that the power line in which the W shape appears in the topological graph of the transient quantity composite value or the steady-state quantity composite value is a fault power line.
In the embodiment, the artificially constructed steady state quantity or steady state quantity is superposed with the collected transient state quantity or steady state quantity of each power line to generate the transient state quantity synthetic value or steady state quantity synthetic value of each power line, and the power line with the W shape is judged as the power line with the fault by judging whether the W shape appears in the topological graph of the transient state quantity synthetic value or steady state quantity synthetic value.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (11)
1. A topological graphical low-current ground fault line selection method is characterized by comprising the following steps:
collecting the transient state quantity of each power line to obtain the transient state quantity measured value of each power line;
artificially constructing a transient quantity, and putting the artificially constructed transient quantity into a low-current grounding system with a fault;
collecting the current transient state quantity of each power line which is put into artificially constructed transient state quantity, and recording the current transient state quantity as the composite value of the transient state quantity of each power line;
and judging that the power line with the W shape in the topological graph of the transient component composite value is a fault power line.
2. The topographically small-current ground fault line selection method of claim 1, further comprising:
and the magnitude of the transient component composite value is adjusted by multiplying the correlation coefficient by the artificially constructed transient component, so that the transient component composite value is in a preset range.
3. A topological graphical low-current ground fault line selection method is characterized by comprising the following steps:
collecting the transient state quantity of each power line to obtain the transient state quantity measured value of each power line;
artificially constructing a transient quantity, and cutting off the artificially constructed transient quantity from a low-current grounding system with a fault;
collecting the current transient state quantity of each power line from which the artificially constructed transient state quantity is cut, and recording the current transient state quantity as the transient state quantity composite value of each power line;
and judging that the power line with the W shape in the topological graph of the transient component composite value is a fault power line.
4. The topographically small-current ground fault line selection method of claim 3, further comprising:
and the magnitude of the transient component composite value is adjusted by multiplying the correlation coefficient by the artificially constructed transient component, so that the transient component composite value is in a preset range.
5. A topological graphical low-current ground fault line selection method is characterized by comprising the following steps:
collecting the steady state quantity of each power line to obtain the steady state quantity measured value of each power line;
artificially constructing a steady state quantity, and putting the artificially constructed steady state quantity into a low-current grounding system with a fault;
collecting the current steady state quantity of each power line which is put into artificially constructed steady state quantity, and recording the current steady state quantity as the steady state quantity composite value of each power line;
and judging that the power line with the W shape in the topological graph of the steady-state quantity composite value is a fault power line.
6. The topographically small-current ground fault line selection method of claim 5, further comprising:
and the correlation coefficient is multiplied by the artificially constructed steady-state quantity to adjust the magnitude of the steady-state quantity composite value, so that the steady-state quantity composite value is in a preset range.
7. A topological graphical low-current ground fault line selection method is characterized by comprising the following steps:
collecting the steady state quantity of each power line to obtain the steady state quantity measured value of each power line;
artificially constructing a steady state quantity, and cutting off the artificially constructed steady state quantity from a low-current grounding system with a fault;
collecting the current steady state quantity of each power line from which the artificially constructed steady state quantity is cut, and recording the current steady state quantity as the steady state quantity synthetic value of each power line;
and judging that the power line with the W shape in the topological graph of the steady-state quantity composite value is a fault power line.
8. The topographically small-current ground fault line selection method of claim 7, further comprising:
and the correlation coefficient is multiplied by the artificially constructed steady-state quantity to adjust the magnitude of the steady-state quantity composite value, so that the steady-state quantity composite value is in a preset range.
9. A topological graphical low-current ground fault line selection device is characterized by comprising:
the fault data acquisition unit is used for acquiring the transient quantity or the steady-state quantity of each power line to obtain a transient quantity measured value or a steady-state quantity measured value of each power line;
an artificial data setting unit for artificially constructing a steady-state quantity or a steady-state quantity;
the artificial data switching unit is used for switching artificially constructed transient state quantity or steady state quantity into the low-current grounding system with the fault or cutting the artificially constructed transient state quantity or steady state quantity from the low-current grounding system with the fault;
the combined value data acquisition unit is used for acquiring current transient quantity or current steady-state quantity of each power line which invests or cuts artificially constructed transient quantity or steady-state quantity, and recording the current transient quantity or current steady-state quantity as a transient quantity combined value or a steady-state quantity combined value of each power line;
and a fault line selection unit for determining that the power line in which the W shape appears in the topological graph of the transient quantity composite value or the steady-state quantity composite value is a fault power line.
10. The topographically small-current ground-fault line selection apparatus of claim 9, wherein the artificial data setting unit is further configured to:
and the magnitude of the transient state quantity composite value or the steady state quantity composite value is adjusted by multiplying the correlation coefficient by the artificially constructed transient state quantity or the artificially constructed steady state quantity, so that the transient state quantity composite value or the steady state quantity composite value is in a preset range.
11. The topographically small-current ground fault line selection device of claim 9, wherein the artificial data switching unit is a high-voltage vacuum contactor or a high-voltage circuit breaker.
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