CN110133446A - The earth fault line selection method and device of topological graph - Google Patents
The earth fault line selection method and device of topological graph Download PDFInfo
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- CN110133446A CN110133446A CN201910505971.4A CN201910505971A CN110133446A CN 110133446 A CN110133446 A CN 110133446A CN 201910505971 A CN201910505971 A CN 201910505971A CN 110133446 A CN110133446 A CN 110133446A
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- G—PHYSICS
- 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
Present disclose provides a kind of earth fault line selection method of topological graph and devices.Wherein, a kind of earth fault line selection method of topological graph, comprising: the transient for acquiring each power circuit obtains the transient state measurement of each power circuit；Artificial building transient, and artificial transient is put into the small current neutral grounding system to break down；Acquisition puts into the current transient amount of each power circuit of artificial transient, is denoted as the transient composite value of each power circuit；Determine the power circuit of W-shape occur in the topological graph of transient composite value for failure power circuit.
Description
Technical field
The disclosure belongs to field of power system more particularly to a kind of earth fault line selection method of topological graph
With device.
Background technique
Only there is provided background technical informations relevant to the disclosure for the statement of this part, it is not necessary to so constitute first skill
Art.
The real-time acquisition system fault-signal of current line selection apparatus carries out faulty line selection using a variety of selection methods, specifically
It include: intelligent group than width phase comparing method, harmonic ratio width phase comparing method, wavelet method, first half-wave method, active component method, energy method, zero sequence
Jump-value of current method etc..A variety of selection methods are fused together with mathematical tools such as rough set theories, are protected to the maximum extent
It demonstrate,proves and realizes have complementary advantages between various selection methods.
Inventors have found that being all based on measured value at present, wherein measured value includes the transient measured when failure occurs
Or steady-state quantity, due to the influence of various interference, especially after system is smaller or installs the arc suppression coil tuned automatically additional, electricity
Capacitance current numerical value is smaller, and when grounding point arc resistance is unstable, the numerical value very little of zero-sequence current or harmonic current may be disturbed
It floods, phase is not necessarily correct, to cause to judge by accident.
Summary of the invention
To solve the above-mentioned problems, the first aspect of the disclosure provides a kind of small current grounding fault of topological graph
Selection method by the size of the fault transient amount or steady-state quantity that artificially control, and generates topological graph, is differentiated by figure
Break down power circuit, improves the accuracy of anti-interference ability and judgement.
To achieve the goals above, the disclosure adopts the following technical scheme that
In one or more embodiments, a kind of earth fault line selection method of topological graph, comprising:
The transient for acquiring each power circuit obtains the transient state measurement of each power circuit；
Artificial building transient, and artificial transient is put into the small current neutral grounding system to break down；
Acquisition puts into the current transient amount of each power circuit of artificial transient, is denoted as the transient of each power circuit
Composite value；
Determine the power circuit of W-shape occur in the topological graph of transient composite value for failure power circuit.
In one or more embodiments, a kind of earth fault line selection method of topological graph, comprising:
The transient for acquiring each power circuit obtains the transient state measurement of each power circuit；
Artificial building transient, and artificial transient is cut off from the small current neutral grounding system to break down；
Acquisition puts into the current transient amount of each power circuit of artificial transient, is denoted as the transient of each power circuit
Composite value；
Determine the power circuit of W-shape occur in the topological graph of transient composite value for failure power circuit.
As an implementation, a kind of earth fault line selection method of topological graph, further includes:
It is multiplied using related coefficient with the transient artificially constructed, to adjust the size of transient composite value, so that transient state
Measure composite value within a preset range.
The advantages of above-mentioned technical proposal is, can when the transient for collecting failure is more than minimum given threshold
To be increased by the transient artificially controlled；When the transient for collecting failure is more than maximum predetermined threshold value, people can be passed through
Reduce for the transient of control, the transient of new failure controlled within the scope of presetting, and generate topological graph,
The power circuit that breaks down is differentiated by figure, and reliable performance, accuracy rate are high.
In one or more embodiments, a kind of earth fault line selection method of topological graph, comprising:
The steady-state quantity for acquiring each power circuit obtains the stable state measurement of each power circuit；
Artificial building steady-state quantity, and put into the small current neutral grounding system to break down；
Acquisition puts into the current steady state amount of each power circuit of artificial steady-state quantity, is denoted as the steady-state quantity of each power circuit
Composite value；
Determine the power circuit of W-shape occur in the topological graph of steady-state quantity composite value for failure power circuit.
In one or more embodiments, a kind of earth fault line selection method of topological graph, comprising:
The steady-state quantity for acquiring each power circuit obtains the stable state measurement of each power circuit；
Artificial building steady-state quantity, and artificial transient is cut off from the small current neutral grounding system to break down；
Acquisition puts into the current steady state amount of each power circuit of artificial steady-state quantity, is denoted as the steady-state quantity of each power circuit
Composite value；
Determine the power circuit of W-shape occur in the topological graph of steady-state quantity composite value for failure power circuit.
As an implementation, a kind of earth fault line selection method of topological graph, further includes:
It is multiplied using related coefficient with the steady-state quantity artificially constructed, to adjust the size of steady-state quantity composite value, so that stable state
Measure composite value within a preset range.
The advantages of above-mentioned technical proposal is, can when the steady-state quantity for collecting failure is more than minimum given threshold
To be increased by the steady-state quantity artificially controlled；When the steady-state quantity for collecting failure is more than maximum predetermined threshold value, people can be passed through
Reduce for the steady-state quantity of control, the steady-state quantity of new failure controlled within the scope of presetting, and generate topological graph,
The power circuit that breaks down is differentiated by figure, and reliable performance, accuracy rate are high.
To solve the above-mentioned problems, the second aspect of the disclosure provides a kind of small current grounding fault of topological graph
Line selection apparatus by the size of the fault transient amount or steady-state quantity that artificially control, and generates topological graph, is differentiated by figure
Break down power circuit, improves the accuracy of anti-interference ability and judgement.
To achieve the goals above, the disclosure adopts the following technical scheme that
A kind of low-current ground fault line selection device of topological graph, comprising:
Failure data acquisition unit is used to acquire transient/steady-state quantity of each power circuit, obtains each power line
Transient state measurement/stable state the measurement on road；
Artificial data setting unit is used to artificially construct steady-state quantity/steady-state quantity；
Artificial data switching unit, is used to put into artificial transient/steady-state quantity to the small current neutral grounding broken down
In system, or artificial transient/steady-state quantity cut off from the small current neutral grounding system to break down；
Composite value data acquisition unit is used to acquire working as each power circuit for putting into artificial transient/steady-state quantity
Preceding transient/current steady state amount is denoted as transient composite value/steady-state quantity composite value of each power circuit；
Failure line selection unit is used to determine W-shape occur in transient composite value/steady-state quantity composite value topological graph
Power circuit be failure power circuit.
As an implementation, the artificial data setting unit, is also used to:
It is multiplied using related coefficient with the transient/steady-state quantity artificially constructed, is closed to adjust transient composite value/steady-state quantity
At the size of value, so that transient composite value/steady-state quantity composite value is within a preset range.
The advantages of above-mentioned technical proposal, is, when the transient/steady-state quantity for collecting failure is more than minimum given threshold
When, it can be increased by the transient/steady-state quantity artificially controlled；When the transient/steady-state quantity for collecting failure is more than maximum
When predetermined threshold, it can be reduced by the transient/steady-state quantity artificially controlled, transient/steady-state quantity of new failure is controlled
Within the scope of presetting, and topological graph is generated, the power circuit that breaks down, reliable performance, standard are differentiated by figure
True rate is high.
As an implementation, artificial data switching unit is high-pressure vacuum contactor or high-voltage circuitbreaker.
The advantages of above-mentioned technical proposal, is, puts into artificial value by high-pressure vacuum contactor or high-voltage circuitbreaker and occurs
The small current neutral grounding system of failure, or from the small current neutral grounding system excision broken down, improve artificial value investment or excision
Efficiency and accuracy, and then for improve failure line selection accuracy lay a good foundation.
The beneficial effect of the disclosure is:
(1) disclosure folds artificial building steady-state quantity/steady-state quantity with the transient/steady-state quantity for acquiring each power circuit
Add, generate transient composite value/steady-state quantity composite value of each power circuit, by judging that transient composite value/steady-state quantity closes
At whether there is W-shape in the topological graph of value, the power circuit for W-shape occur is determined as failure power circuit, and the disclosure is logical
It crosses figure and differentiates the power circuit that breaks down, improve the accuracy of anti-interference ability and judgement.
(2) when the transient/steady-state quantity for collecting failure is more than minimum given threshold, the disclosure is by artificially controlling
The transient of system/steady-state quantity increases；When the transient/steady-state quantity for collecting failure is more than maximum predetermined threshold value, the disclosure is logical
The transient that artificially controls/steady-state quantity is crossed to reduce, transient/steady-state quantity control of new failure preset range it
Interior, reliable performance, accuracy rate are high.
Detailed description of the invention
The Figure of description for constituting a part of this disclosure is used to provide further understanding of the disclosure, and the disclosure is shown
Meaning property embodiment and its explanation do not constitute the improper restriction to the disclosure for explaining the disclosure.
Fig. 1 is a kind of 1 flow chart of earth fault line selection method embodiment for topological graph that the disclosure provides.
Fig. 2 is a kind of 2 flow chart of earth fault line selection method embodiment for topological graph that the disclosure provides.
Fig. 3 is a kind of 3 flow chart of earth fault line selection method embodiment for topological graph that the disclosure provides.
Fig. 4 is a kind of 4 flow chart of earth fault line selection method embodiment for topological graph that the disclosure provides.
Fig. 5 is a kind of low-current ground fault line selection device example structure signal for topological graph that the disclosure provides
Figure.
Specific embodiment
The disclosure is described further with embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the disclosure.Unless another
It indicates, all technical and scientific terms used herein has usual with disclosure person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the disclosure.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
Embodiment 1
Fig. 1 gives a kind of earth fault line selection method flow chart of topological graph of embodiment 1.Such as Fig. 1
It is shown, the earth fault line selection method of the topological graph of the present embodiment, comprising:
S101: acquiring the transient of each power circuit, obtains the transient state measurement of each power circuit.
In specific implementation, the transient of each power circuit can be acquired by collection in worksite or a distant place.
It should be noted that transient can be the magnitude of current or voltage, those skilled in the art can come according to the actual situation
Voluntarily selection acquisition.
If transient is the magnitude of current, current collecting device can be used and carry out collection in worksite or distant place acquisition.
It is set it should be noted that current collecting device includes but is not limited to that current transformer etc. is existing for current acquisition
It is standby.
If transient is voltage, voltage collecting device can be used and carry out collection in worksite or distant place acquisition.
It is set it should be noted that voltage collecting device includes but is not limited to that voltage transformer etc. is existing for current acquisition
It is standby.
S102: transient is artificially constructed, and artificial transient is put into the small current neutral grounding system to break down.
Specifically, artificially building transient is known quantity.
It should be noted that transient can be the magnitude of current or voltage, and consistent with the transient in step S101.
After artificially constructing transient, the transient artificially constructed can be put into hair by high-pressure vacuum contactor
In the small current neutral grounding system of raw failure.
S103: acquisition puts into the current transient amount of each power circuit of artificial transient, is denoted as each power circuit
Transient composite value.
In specific implementation, it is also multiplied using related coefficient with the transient artificially constructed, to adjust transient composite value
Size so that transient composite value is within a preset range.
When the transient for collecting failure is more than minimum given threshold, it can be increased by the transient artificially controlled
Greatly；When the transient for collecting failure is more than maximum predetermined threshold value, can be reduced by the transient artificially controlled, new
The transient of failure controls within the scope of presetting, and generates topological graph, differentiates the electric power that breaks down by figure
Route, reliable performance, accuracy rate are high.
Specifically, collection in worksite or a distant place collect the transient of failure and are superimposed with the transient of arteface, transient state
Measure the calculation formula of composite value are as follows:
F=(A+x)-(kB+x)
F=A-kB
In formula:
A: the power circuit transient state measurement to break down, abbreviation measured value；
X: the disturbance quantity of system；
B: the transient artificially constructed, abbreviation artificial value；
K: related coefficient；
F: the transient after measured value and artificial value operation, abbreviation composite value.
By the formula of above-mentioned transient composite value: transient composite value is not influenced by the disturbance quantity of system, is led to
The power circuit that is out of order can accurately be judged by crossing transient composite value.
S104: determine the power circuit of W-shape occur in the topological graph of transient composite value for failure power circuit.
There is " W " shape and shows in computer background in the topological graph of transient composite value, obtains intuitive image, calculates
Machine obtains occurring the power circuit of ground fault according to " W " shape topological graph or artificial observation obtains that ground fault occurs
Power circuit, realize the route selection of the small current grounding fault of topological graph.
Embodiment 2
Fig. 2 gives a kind of earth fault line selection method flow chart of topological graph of embodiment 2.Such as Fig. 2
It is shown, the earth fault line selection method of the topological graph of the present embodiment, comprising:
S201: acquiring the transient of each power circuit, obtains the transient state measurement of each power circuit.
In specific implementation, the transient of each power circuit can be acquired by collection in worksite or a distant place.
It should be noted that transient can be the magnitude of current or voltage, those skilled in the art can come according to the actual situation
Voluntarily selection acquisition.
If transient is the magnitude of current, current collecting device can be used and carry out collection in worksite or distant place acquisition.
It is set it should be noted that current collecting device includes but is not limited to that current transformer etc. is existing for current acquisition
It is standby.
If transient is voltage, voltage collecting device can be used and carry out collection in worksite or distant place acquisition.
It is set it should be noted that voltage collecting device includes but is not limited to that voltage transformer etc. is existing for current acquisition
It is standby.
S202: transient is artificially constructed, and artificial transient is cut off from the small current neutral grounding system to break down.
Specifically, artificially building transient is known quantity.
It should be noted that transient can be the magnitude of current or voltage, and consistent with the transient in step S201.
After artificially constructing transient, artificial transient can be connect from the low current to break down by high-voltage circuitbreaker
It is cut off in ground system.
S203: acquisition puts into the current transient amount of each power circuit of artificial transient, is denoted as each power circuit
Transient composite value.
In specific implementation, it is also multiplied using related coefficient with the transient artificially constructed, to adjust transient composite value
Size so that transient composite value is within a preset range.
When the transient for collecting failure is more than minimum given threshold, it can be increased by the transient artificially controlled
Greatly；When the transient for collecting failure is more than maximum predetermined threshold value, can be reduced by the transient artificially controlled, new
The transient of failure controls within the scope of presetting, and generates topological graph, differentiates the electric power that breaks down by figure
Route, reliable performance, accuracy rate are high.
Specifically, collection in worksite or a distant place collect the transient of failure and are superimposed with the transient of arteface, transient state
Measure the calculation formula of composite value are as follows:
F=(A+x)-(kB+x)
F=A-kB
In formula:
A: the power circuit transient state measurement to break down, abbreviation measured value；
X: the disturbance quantity of system；
B: the transient artificially constructed, abbreviation artificial value；
K: related coefficient；
F: the transient after measured value and artificial value operation, abbreviation composite value.
By the formula of above-mentioned transient composite value: transient composite value is not influenced by the disturbance quantity of system, is led to
The power circuit that is out of order can accurately be judged by crossing transient composite value.
S204: determine the power circuit of W-shape occur in the topological graph of transient composite value for failure power circuit.
There is " W " shape and shows in computer background in the topological graph of transient composite value, obtains intuitive image, calculates
Machine obtains occurring the power circuit of ground fault according to " W " shape topological graph or artificial observation obtains that ground fault occurs
Power circuit, realize the route selection of the small current grounding fault of topological graph.
Embodiment 3
Fig. 3 gives a kind of earth fault line selection method flow chart of topological graph of embodiment 3.Such as Fig. 3
It is shown, the earth fault line selection method of the topological graph of the present embodiment, comprising:
S301: acquiring the steady-state quantity of each power circuit, obtains the stable state measurement of each power circuit.
In specific implementation, the steady-state quantity of each power circuit can be acquired by collection in worksite or a distant place.
It should be noted that steady-state quantity can be the magnitude of current or voltage, those skilled in the art can come according to the actual situation
Voluntarily selection acquisition.
If steady-state quantity is the magnitude of current, current collecting device can be used and carry out collection in worksite or distant place acquisition.
It is set it should be noted that current collecting device includes but is not limited to that current transformer etc. is existing for current acquisition
It is standby.
If steady-state quantity is voltage, voltage collecting device can be used and carry out collection in worksite or distant place acquisition.
It is set it should be noted that voltage collecting device includes but is not limited to that voltage transformer etc. is existing for current acquisition
It is standby.
S302: steady-state quantity is artificially constructed, and is put into the small current neutral grounding system to break down.
Specifically, artificially building steady-state quantity is known quantity.
It should be noted that steady-state quantity can be the magnitude of current or voltage, and consistent with the steady-state quantity in step S301.
After artificially constructing steady-state quantity, the steady-state quantity artificially constructed can be put into hair by high-pressure vacuum contactor
In the small current neutral grounding system of raw failure.
S303: acquisition puts into the current steady state amount of each power circuit of artificial steady-state quantity, is denoted as each power circuit
Steady-state quantity composite value.
In specific implementation, it is also multiplied using related coefficient with the steady-state quantity artificially constructed, to adjust steady-state quantity composite value
Size so that steady-state quantity composite value is within a preset range.
When the steady-state quantity for collecting failure is more than minimum given threshold, it can be increased by the steady-state quantity artificially controlled
Greatly；When the steady-state quantity for collecting failure is more than maximum predetermined threshold value, can be reduced by the steady-state quantity artificially controlled, new
The steady-state quantity of failure controls within the scope of presetting, and generates topological graph, differentiates the electric power that breaks down by figure
Route, reliable performance, accuracy rate are high.
Specifically, collection in worksite or a distant place collect the steady-state quantity of failure and are superimposed with the steady-state quantity of arteface, stable state
Measure the calculation formula of composite value are as follows:
F '=(A '+x)-(kB '+x)
F '=A '-kB '
In formula:
A ': the power circuit stable state measurement to break down, abbreviation measured value；
X: the disturbance quantity of system；
B ': the steady-state quantity artificially constructed, abbreviation artificial value；
K: related coefficient；
F ': the steady-state quantity after measured value and artificial value operation, abbreviation composite value.
By the formula of above-mentioned steady-state quantity composite value: steady-state quantity composite value is not influenced by the disturbance quantity of system, is led to
The power circuit that is out of order can accurately be judged by crossing steady-state quantity composite value.
S304: determine the power circuit of W-shape occur in the topological graph of steady-state quantity composite value for failure power circuit.
There is " W " shape and shows in computer background in the topological graph of steady-state quantity composite value, obtains intuitive image, calculates
Machine obtains occurring the power circuit of ground fault according to " W " shape topological graph or artificial observation obtains that ground fault occurs
Power circuit, realize the route selection of the small current grounding fault of topological graph.
Embodiment 4
Fig. 4 gives a kind of earth fault line selection method flow chart of topological graph of embodiment 4.Such as Fig. 4
It is shown, the earth fault line selection method of the topological graph of the present embodiment, comprising:
S401: acquiring the steady-state quantity of each power circuit, obtains the stable state measurement of each power circuit；
In specific implementation, the steady-state quantity of each power circuit can be acquired by collection in worksite or a distant place.
It should be noted that steady-state quantity can be the magnitude of current or voltage, those skilled in the art can come according to the actual situation
Voluntarily selection acquisition.
If steady-state quantity is the magnitude of current, current collecting device can be used and carry out collection in worksite or distant place acquisition.
It is set it should be noted that current collecting device includes but is not limited to that current transformer etc. is existing for current acquisition
It is standby.
If steady-state quantity is voltage, voltage collecting device can be used and carry out collection in worksite or distant place acquisition.
It is set it should be noted that voltage collecting device includes but is not limited to that voltage transformer etc. is existing for current acquisition
It is standby.
S402: steady-state quantity is artificially constructed, and artificial transient is cut off from the small current neutral grounding system to break down；
Specifically, artificially building steady-state quantity is known quantity.
It should be noted that steady-state quantity can be the magnitude of current or voltage, and consistent with the steady-state quantity in step S401.
It, can be former from occurring by artificial transient by high-pressure vacuum contactor or breaker after artificially constructing steady-state quantity
It is cut off in the small current neutral grounding system of barrier.
S403: acquisition puts into the current steady state amount of each power circuit of artificial steady-state quantity, is denoted as each power circuit
Steady-state quantity composite value；
In specific implementation, it is also multiplied using related coefficient with the steady-state quantity artificially constructed, to adjust steady-state quantity composite value
Size so that steady-state quantity composite value is within a preset range.
When the steady-state quantity for collecting failure is more than minimum given threshold, it can be increased by the steady-state quantity artificially controlled
Greatly；When the steady-state quantity for collecting failure is more than maximum predetermined threshold value, can be reduced by the steady-state quantity artificially controlled, new
The steady-state quantity of failure controls within the scope of presetting, and generates topological graph, differentiates the electric power that breaks down by figure
Route, reliable performance, accuracy rate are high.
Specifically, collection in worksite or a distant place collect the steady-state quantity of failure and are superimposed with the steady-state quantity of arteface, stable state
Measure the calculation formula of composite value are as follows:
F '=(A '+x)-(kB '+x)
F '=A '-kB '
In formula:
A ': the power circuit stable state measurement to break down, abbreviation measured value；
X: the disturbance quantity of system；
B ': the steady-state quantity artificially constructed, abbreviation artificial value；
K: related coefficient；
F ': the steady-state quantity after measured value and artificial value operation, abbreviation composite value.
By the formula of above-mentioned steady-state quantity composite value: steady-state quantity composite value is not influenced by the disturbance quantity of system, is led to
The power circuit that is out of order can accurately be judged by crossing steady-state quantity composite value.
S404: determine the power circuit of W-shape occur in the topological graph of steady-state quantity composite value for failure power circuit.
There is " W " shape and shows in computer background in the topological graph of steady-state quantity composite value, obtains intuitive image, calculates
Machine obtains occurring the power circuit of ground fault according to " W " shape topological graph or artificial observation obtains that ground fault occurs
Power circuit, realize the route selection of the small current grounding fault of topological graph.
Embodiment 5
As shown in figure 5, a kind of low-current ground fault line selection device of topological graph of the present embodiment, comprising:
(1) failure data acquisition unit is used to acquire transient/steady-state quantity of each power circuit, obtains each electricity
Transient state measurement/stable state the measurement on line of force road；
(2) artificial data setting unit is used to artificially construct steady-state quantity/steady-state quantity；
Specifically, the artificial data setting unit, is also used to:
It is multiplied using related coefficient with the transient/steady-state quantity artificially constructed, is closed to adjust transient composite value/steady-state quantity
At the size of value, so that transient composite value/steady-state quantity composite value is within a preset range.
When transient/the steady-state quantity for collecting failure is more than minimum given threshold, the present embodiment is by artificially controlling
The transient of system/steady-state quantity increases；When the transient/steady-state quantity for collecting failure is more than maximum predetermined threshold value, the present embodiment
Reduced by the transient/steady-state quantity artificially controlled, transient/steady-state quantity of new failure is controlled in preset range
Within, reliable performance, accuracy rate are high.
(3) artificial data switching unit, is used to put into artificial transient/steady-state quantity to the low current to break down and connects
In ground system, or artificial transient/steady-state quantity cut off from the small current neutral grounding system to break down.
The artificial data switching unit of the present embodiment is high-pressure vacuum contactor switching capacitance, and then generates composite value.
It should be noted that high-pressure vacuum contactor or high-voltage circuitbreaker can also be used in artificial data switching unit, other are existing
Some control devices put into artificial transient/steady-state quantity into the small current neutral grounding system to break down to realize, or by people
It is cut off from the small current neutral grounding system to break down for transient/steady-state quantity.
(4) composite value data acquisition unit is used to acquire each power circuit for putting into artificial transient/steady-state quantity
Current transient amount/current steady state amount is denoted as transient composite value/steady-state quantity composite value of each power circuit；
(5) failure line selection unit is used to determine W occur in transient composite value/steady-state quantity composite value topological graph
The power circuit of shape is failure power circuit.
Artificial building steady-state quantity/steady-state quantity is superimposed by the present embodiment with the transient/steady-state quantity for acquiring each power circuit,
Transient composite value/steady-state quantity the composite value for generating each power circuit, by judging transient composite value/steady-state quantity composite value
Topological graph in whether there is W-shape, the power circuit for W-shape occur is determined as failure power circuit, and the disclosure passes through figure
Shape differentiates the power circuit that breaks down, and improves the accuracy of anti-interference ability and judgement.
The foregoing is merely preferred embodiment of the present disclosure, are not limited to the disclosure, for the skill of this field
For art personnel, the disclosure can have various modifications and variations.It is all within the spirit and principle of the disclosure, it is made any to repair
Change, equivalent replacement, improvement etc., should be included within the protection scope of the disclosure.
Claims (10)
1. a kind of earth fault line selection method of topological graph characterized by comprising
The transient for acquiring each power circuit obtains the transient state measurement of each power circuit；
Artificial building transient, and artificial transient is put into the small current neutral grounding system to break down；
Acquisition puts into the current transient amount of each power circuit of artificial transient, is denoted as the transient synthesis of each power circuit
Value；
Determine the power circuit of W-shape occur in the topological graph of transient composite value for failure power circuit.
2. a kind of earth fault line selection method of topological graph as described in claim 1, which is characterized in that also wrap
It includes:
It is multiplied using related coefficient with the transient artificially constructed, to adjust the size of transient composite value, so that transient closes
Within a preset range at value.
3. a kind of earth fault line selection method of topological graph characterized by comprising
The transient for acquiring each power circuit obtains the transient state measurement of each power circuit；
Artificial building transient, and artificial transient is cut off from the small current neutral grounding system to break down；
Acquisition puts into the current transient amount of each power circuit of artificial transient, is denoted as the transient synthesis of each power circuit
Value；
Determine the power circuit of W-shape occur in the topological graph of transient composite value for failure power circuit.
4. a kind of earth fault line selection method of topological graph as claimed in claim 3, which is characterized in that also wrap
It includes:
It is multiplied using related coefficient with the transient artificially constructed, to adjust the size of transient composite value, so that transient closes
Within a preset range at value.
5. a kind of earth fault line selection method of topological graph characterized by comprising
The steady-state quantity for acquiring each power circuit obtains the stable state measurement of each power circuit；
Artificial building steady-state quantity, and put into the small current neutral grounding system to break down；
Acquisition puts into the current steady state amount of each power circuit of artificial steady-state quantity, is denoted as the steady-state quantity synthesis of each power circuit
Value；
Determine the power circuit of W-shape occur in the topological graph of steady-state quantity composite value for failure power circuit.
6. a kind of earth fault line selection method of topological graph as claimed in claim 5, which is characterized in that also wrap
It includes:
It is multiplied using related coefficient with the steady-state quantity artificially constructed, to adjust the size of steady-state quantity composite value, so that steady-state quantity closes
Within a preset range at value.
7. a kind of earth fault line selection method of topological graph characterized by comprising
The steady-state quantity for acquiring each power circuit obtains the stable state measurement of each power circuit；
Artificial building steady-state quantity, and artificial transient is cut off from the small current neutral grounding system to break down；
Acquisition puts into the current steady state amount of each power circuit of artificial steady-state quantity, is denoted as the steady-state quantity synthesis of each power circuit
Value；
Determine the power circuit of W-shape occur in the topological graph of steady-state quantity composite value for failure power circuit.
8. a kind of earth fault line selection method of topological graph as claimed in claim 7, which is characterized in that also wrap
It includes:
It is multiplied using related coefficient with the steady-state quantity artificially constructed, to adjust the size of steady-state quantity composite value, so that steady-state quantity closes
Within a preset range at value.
9. a kind of low-current ground fault line selection device of topological graph characterized by comprising
Failure data acquisition unit is used to acquire transient/steady-state quantity of each power circuit, obtains each power circuit
Transient state measurement/stable state measurement；
Artificial data setting unit is used to artificially construct steady-state quantity/steady-state quantity；
Artificial data switching unit, is used to put into artificial transient/steady-state quantity to the small current neutral grounding system to break down
In, or artificial transient/steady-state quantity cut off from the small current neutral grounding system to break down；
Composite value data acquisition unit is used to acquire the current temporary of each power circuit for putting into artificial transient/steady-state quantity
State amount/current steady state amount is denoted as transient composite value/steady-state quantity composite value of each power circuit；
Failure line selection unit is used to determine the electricity of W-shape occur in transient composite value/steady-state quantity composite value topological graph
Line of force road is failure power circuit.
10. a kind of low-current ground fault line selection device of topological graph as claimed in claim 9, which is characterized in that institute
Artificial data setting unit is stated, is also used to:
It is multiplied using related coefficient with the transient/steady-state quantity artificially constructed, to adjust transient composite value/steady-state quantity composite value
Size so that transient composite value/steady-state quantity composite value is within a preset range；
Or
Artificial data switching unit is high-pressure vacuum contactor or high-voltage circuitbreaker.
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