CN108061842A - Single-phase grounded malfunction in grounded system of low current localization method and system - Google Patents
Single-phase grounded malfunction in grounded system of low current localization method and system Download PDFInfo
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- CN108061842A CN108061842A CN201711346962.2A CN201711346962A CN108061842A CN 108061842 A CN108061842 A CN 108061842A CN 201711346962 A CN201711346962 A CN 201711346962A CN 108061842 A CN108061842 A CN 108061842A
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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
- G01R31/088—Aspects of digital computing
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
Abstract
The present invention provides single-phase grounded malfunction in grounded system of low current localization method and system, method includes obtaining the line state information of system parameter message and each test point；Adaptively selected mutually to inject disturbing signal to a certain non-faulting according to line state information failure judgement phase line, which is realized by the ground resistance for the resistance value that can be self-regulated；Disturbing signal response sequence is formed using disturbing signal, and judges whether test point is located at fault section according to disturbing signal response sequence；It will determine that result forms test point report and is uploaded to main website, and line selection and location completed according to wire topologies.By the present invention in that different Groundings of the disturbing signal according to neutral point, select the Fault Locating Method of out of phase injection, effectively improve the accuracy of pouring-in fault location, have very high practical value in engineering.
Description
Technical field
The present invention relates to technical field of electric power automation, are positioned more particularly, to single-phase grounded malfunction in grounded system of low current
Method and system.
Background technology
China's 6-35kV medium voltage distribution networks generally by the way of isolated neutral or neutral by arc extinction coil grounding,
Singlephase earth fault often occurs in the process of running for system, since the fault current of singlephase earth fault is smaller, fault signature is multiple
It is miscellaneous so that the search and orientation of trouble point is extremely difficult.
Existing method can be divided into two major classes：Fault message line selection and location and additional diagnostic signal line selection and location.Wherein,
The existing protective device according to the second class method development, using it is random or alternately by the way of the mutually additional diagnostic signal of non-faulting into
Row fault location, but in actual moving process, for occurring the system of singlephase earth fault through larger transition resistance, it is random or
Alternately after the mutually additional diagnostic signal of non-faulting, the electric current of failure phase test point is likely to occur change compared with disturbing signal is not applied
Greatly, situations such as constant and reduction, make the various fault location that can not be accurately used for system of obtained fault message, cause to protect
Protection unit stroke defect.
In conclusion at present in the additional diagnostic signal Fault Locating Method of the technical field, electrical quantity selection, calculate with
And all had some disadvantages on logic judgment, and it is poor for increasingly flexible power distribution network accuracy, it can not be in engineering field
It is widely popularized.
The content of the invention
In view of this, it is an object of the invention to provide single-phase grounded malfunction in grounded system of low current localization method and it is
System, by making disturbing signal according to the different Groundings of neutral point using the adaptively selected event mutually injected to a certain non-faulting
Hinder localization method, effectively improve the accuracy of pouring-in fault location, there is very high practical value in engineering.
In a first aspect, an embodiment of the present invention provides single-phase grounded malfunction in grounded system of low current localization method, including：
Obtain the line state information of system parameter message and each test point；
It is adaptively selected to inject disturbance letter to non-faulting phase line according to the line state information failure judgement phase line
Number；
Disturbing signal response sequence is formed using the disturbing signal, and institute is judged according to the disturbing signal response sequence
State whether test point is located at fault section；
It will determine that result forms test point report and is uploaded to main website, and line selection and location completed according to wire topologies.
With reference to first aspect, an embodiment of the present invention provides the first possible embodiment of first aspect, wherein, root
It is adaptively selected to include to non-faulting phase line injection disturbance information according to the line state information failure judgement phase line：
System neutral ground state is judged according to the system parameter message, wherein, the neutral ground state bag
It whether includes through grounding through arc；
If through grounding through arc, judge whether the arc suppression coil is undercompensation state, and in non-undercompensation shape
Under state, according to the line state information judge the system whether single-phase earthing；；
If single-phase earthing, then the first virtual value of phase current of the failure phase line is recorded；
Apply the disturbing signal to the phase for being ahead of failure phase, the disturbing signal is disconnected after continuing 0.2s, wherein,
The disturbing signal is the ground resistance signal of resistance value of being self-regulated；
Record applies the second virtual value of phase current of the failure phase line after the disturbing signal；
Stop after applying the disturbing signal, wait 0.2s.
The possible embodiment of with reference to first aspect the first, an embodiment of the present invention provides second of first aspect
Possible embodiment, wherein, it further includes：
If without grounding through arc or through grounding through arc and under the undercompensation state, according to
Line state information judge the system whether single-phase earthing；
If single-phase earthing, then the phase current virtual value of the failure phase line is recorded；
Apply the disturbing signal to the phase for lagging behind failure phase, the disturbing signal is disconnected after continuing 0.2s, wherein,
The disturbing signal is the ground resistance signal of resistance value of being self-regulated；
Record applies the 3rd virtual value of phase current of the failure phase line after the disturbing signal；
Stop after applying the disturbing signal, wait 0.2s.
With reference to first aspect, an embodiment of the present invention provides the third possible embodiment of first aspect, wherein,
It is described adaptively selected after non-faulting mutually injects disturbing signal, it is described to form disturbing signal response using the disturbing signal
Before sequence, further include：
Judge whether the number for applying the disturbing signal is more than predetermined threshold value, the predetermined threshold value is the disturbing signal
The threshold number of injection；
If less than the predetermined threshold value, then circulate operation is carried out according to continuing to inject the disturbing signal, and recorded every
Secondary circulate operation result.
The possible embodiment of with reference to first aspect the first or second of possible embodiment, the embodiment of the present invention
The 4th kind of possible embodiment of first aspect is provided, wherein, it is described to form disturbing signal sound using the disturbing signal
It answers sequence, and judges whether the test point includes positioned at fault section according to the disturbing signal response sequence：
According to apply the second virtual value of the phase current after the disturbing signal or the 3rd virtual value of the phase current with
The ratio of the first virtual value of the phase current when single-phase earthing only occurs determines the disturbing signal response sequence；
Judge whether the injection sequence of the disturbing signal response sequence and disturbing signal is identical；
If identical, the test point is located at the fault section；
If it is different, then the test point is located at normal reach.
The 4th kind of possible embodiment with reference to first aspect, an embodiment of the present invention provides the 5th kind of first aspect
Possible embodiment, wherein, the line state information includes the three-phase current of each test point, according to the circuit shape
State information judges whether single-phase earthing includes the system：
Phase current mutation parameter is calculated according to the three-phase current of each test point；
By the phase current mutation parameter compared with default value, when the phase current mutation parameter is greater than or equal to
The default value then judges that the phase current is undergone mutation.
Second aspect, an embodiment of the present invention provides a kind of single-phase grounded malfunction in grounded system of low current alignment system, bags
It includes：
Acquiring unit, for obtaining the line state information of system parameter message and each test point；
First judging unit, for according to the line state information failure judgement phase line, it is adaptively selected to non-therefore
Hinder phase line injection disturbing signal；
Second judgment unit, for forming disturbing signal response sequence using the disturbing signal, and according to the disturbance
Signal response sequence judges whether the test point is located at fault section；
Line selection and location unit is uploaded to main website for will determine that result forms test point report, and according to line topological knot
Structure completes line selection and location.
With reference to second aspect, an embodiment of the present invention provides the first possible embodiment of second aspect, wherein, institute
Stating the first judging unit includes：
3rd judging unit, for judging system neutral ground state according to the system parameter message, wherein, it is described
Neutral ground state is included whether through grounding through arc；
4th judging unit, in the case of through grounding through arc, judging institute according to the line state information
State system whether single-phase earthing；
First recording unit, the phase current first in the case of single-phase earthing, recording the failure phase line have
Valid value；
Signal injection unit for applying the disturbing signal to the phase for being ahead of failure phase, disconnects after continuing 0.2s
The disturbing signal, wherein, the disturbing signal is the ground resistance signal of resistance value of being self-regulated；
Second recording unit, the phase current second for the failure phase line after the record application disturbing signal are effective
Value；
Timing unit, for after stopping applying the disturbing signal, waiting 0.2s.
With reference to second aspect, an embodiment of the present invention provides second of possible embodiment of second aspect, wherein, institute
Stating second judgment unit includes：
Computing unit, for effective according to the second virtual value of phase current after the application disturbing signal or phase current the 3rd
The ratio of the first virtual value of phase current when value is with only occurring single-phase earthing determines the disturbing signal response sequence；
5th judging unit, for judge the injection sequence of the disturbing signal response sequence and disturbing signal whether phase
Together, if identical, the test point is located at the fault section；If it is different, then the test point is located at normal reach.
With reference to the first possible embodiment of second aspect, an embodiment of the present invention provides the third of second aspect
Possible embodiment, wherein, the line state information includes the three-phase current of each test point, and the described 4th judges list
Member includes：
Phase current mutation parameter is calculated according to the three-phase current of each test point；
By the phase current mutation parameter compared with default value, when the phase current mutation parameter is greater than or equal to
The default value then judges that the phase current is undergone mutation.
The present invention provides single-phase grounded malfunction in grounded system of low current localization method and system, method includes acquisition system
The line state information of parameter information and each test point；According to line state information failure judgement phase line, it is adaptively selected to
A certain non-faulting mutually injects disturbing signal；Disturbing signal response sequence is formed using disturbing signal, and is responded according to disturbing signal
Sequence judges whether test point is located at fault section；It will determine that result forms test point report and is uploaded to main website, and according to circuit
Topological structure completes line selection and location.By the present invention in that different Groundings of the disturbing signal according to neutral point, select different phases
The Fault Locating Method of position injection effectively improves the accuracy of pouring-in fault location, has very high practical valency in engineering
Value.
Other features and advantages of the present invention will illustrate in the following description, also, partly become from specification
It obtains it is clear that being understood by implementing the present invention.The purpose of the present invention and other advantages are in specification, claims
And specifically noted structure is realized and obtained in attached drawing.
For the above objects, features and advantages of the present invention is enable to be clearer and more comprehensible, preferred embodiment cited below particularly, and coordinate
Appended attached drawing, is described in detail below.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution of the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in describing below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is single-phase grounded malfunction in grounded system of low current localization method flow chart provided in an embodiment of the present invention；
Fig. 2 is another single-phase grounded malfunction in grounded system of low current localization method flow chart provided in an embodiment of the present invention；
Fig. 3 is isolated neutral low current single-phase-to-ground fault simulation model figure provided in an embodiment of the present invention；
Fig. 4 is provided in an embodiment of the present invention when ground resistance is respectively 10 Ω, 100 Ω, 500 Ω, applies disturbance letter
The oscillogram of test point curent change before and after number；
Fig. 5 is single-phase grounded malfunction in grounded system of low current alignment system schematic diagram provided in an embodiment of the present invention.
Icon：
10- acquiring units；The first judging units of 20-；30- second judgment units；40- line selection and location units.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with attached drawing to the present invention
Technical solution be clearly and completely described, it is clear that described embodiment be part of the embodiment of the present invention rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower all other embodiments obtained, belong to the scope of protection of the invention.
At present, the method for the prior art all has some disadvantages on electrical quantity selection, calculating and logic judgment, and
It is poor for increasingly flexible power distribution network accuracy, it can not be widely popularized in engineering field, based on this, the embodiment of the present invention provides
Single-phase grounded malfunction in grounded system of low current localization method and system, by the way that disturbing signal is made to be grounded according to the different of neutral point
Situation using the adaptively selected Fault Locating Method mutually injected to a certain non-faulting, effectively improves pouring-in fault location
Accuracy has very high practical value in engineering.
It is single-phase to the small current neutral grounding system disclosed in the embodiment of the present invention first for ease of understanding the present embodiment
Earth design method describes in detail.
Embodiment one：
Fig. 1 is single-phase grounded malfunction in grounded system of low current localization method flow chart provided in an embodiment of the present invention.
With reference to Fig. 1, step S101, the line state information of acquisition system parameter message and each test point；
Step S102, it is adaptively selected mutually to be injected to a certain non-faulting according to line state information failure judgement phase line
Disturbing signal；
Step S103 forms disturbing signal response sequence using disturbing signal, and is judged according to disturbing signal response sequence
Whether test point is located at fault section；
Step S104 will determine that result forms test point report and is uploaded to main website, and complete to select according to wire topologies
Line positions.
Specifically, first, after obtaining and reading system parameter message, judge the ground state of system neutral, pass through electricity
Current transformer monitors three-phase current at each test point of power distribution network in real time, quick true after singlephase earth fault occurs for power distribution network
Surely the failure phase of single-phase earthing occurs, then, with reference to the neutral ground situation of small current neutral grounding system, to lag or lead in
The non-faulting of failure phase mutually applies disturbing signal, so as to increase test point faulted phase current signal, and passes through detection disturbing signal
Response sequence judges whether the test point is located at fault section, finally, the judgement information of each test point is uploaded to main website,
The topological structure of combined circuit is so as to fulfill line selection and location.Here, by installing current transformer on each test point of power distribution network
The parameter acquiring monitored in real time.
It should be noted that it as shown in Fig. 2, is reading systematic parameter and is judging that system neutral is through arc suppression coil
After the situation of ground connection, it should also judge that arc suppression coil whether in undercompensation state, will be refined as with this through grounding through arc
Two kinds of situations.If it is judged that for undercompensation state, then Fault Locating Method with system provided in an embodiment of the present invention without
Grounding through arc is consistent；If a determination be made that being not in undercompensation state, then Fault Locating Method is implemented with the present invention
Example provides consistent through grounding through arc localization method.
Further, step S102 includes：
System neutral ground state is judged according to system parameter message, wherein, neutral ground state include whether through
Grounding through arc；
If through grounding through arc, according to line state information judge system whether single-phase earthing；
If single-phase earthing, then the first virtual value of phase current of failure phase line is recorded；
Apply disturbing signal to the phase for being ahead of failure phase, disturbing signal is disconnected after continuing 0.2s, wherein, disturbing signal
For the ground resistance signal for the resistance value that can be self-regulated；
Record applies the second virtual value of phase current of failure phase line after disturbing signal；
Stop after applying disturbing signal, wait 0.2s.
Further, if without grounding through arc, the disturbing signal is applied to the phase for lagging behind failure phase,
Remaining step is consistent with the situation through grounding through arc.
Further, after step s 102, further included before step S103：
Judge whether the number for applying disturbing signal is more than predetermined threshold value；
If less than predetermined threshold value, then circulate operation is carried out according to continuing to inject disturbing signal, and record cycle behaviour every time
Make result.
Further, step S103 includes：
The list occurs according to the second virtual value of phase current after application disturbing signal or the 3rd virtual value of phase current and only
The ratio of the first virtual value of phase current when being mutually grounded determines disturbing signal response sequence；
Judge whether the injection sequence of disturbing signal response sequence and disturbing signal is identical；
If identical, test point is located at the fault section；
If it is different, then test point is located at normal reach.
Specifically, by ratio compared with artificial default definite value, when the ratio is more than default definite value, then this is disturbed
Dynamic signal response is 1, conversely, being then 0, records the disturbing signal response sequence that all disturbing signals are formed, and by it with disturbing
The injection sequence of dynamic signal is compared, so as to judge whether test point is located at fault section.
Further, line state information includes the three-phase current of each test point, judges system according to line state information
Whether single-phase earthing includes：
Phase current mutation parameter is calculated according to the three-phase current of each test point；
By phase current mutation parameter compared with default value, when phase current mutation parameter is greater than or equal to present count
Value, then judge that phase current is undergone mutation.
Further, predetermined threshold value is the threshold number of disturbing signal injection.
The present invention provides single-phase grounded malfunction in grounded system of low current localization method and system, method includes acquisition system
The line state information of parameter information and each test point；According to line state information failure judgement phase line, it is adaptively selected to
A certain non-faulting mutually injects disturbing signal；Disturbing signal response sequence is formed using disturbing signal, and is responded according to disturbing signal
Sequence judges whether test point is located at fault section；It will determine that result forms test point report and is uploaded to main website, and according to circuit
Topological structure completes line selection and location.By the present invention in that different Groundings of the disturbing signal according to neutral point, using adaptive
The Fault Locating Method mutually injected to a certain non-faulting is selected, the accuracy of pouring-in fault location is effectively improved, in engineering
With very high practical value.
Embodiment two：
The method provided below according to simulation model inventive embodiments is discussed in detail.As shown in figure 3, Fig. 3 is use
The isolated neutral low current single-phase-to-ground fault model that electric power transient simulation software ATP is built.Wherein, CT is installation
Current transformer on three-phase line installs current transformer additional to the head end of each branched line in addition to busbar, for
The different length of circuit sets one or more test points, and in embodiments of the present invention, X0025 exports test point, CT for busbar
1 is is arranged on the current transformer on the test point, and XX0007 is that Single-phase Ground Connection Failure, XX0015 and XX0018 are non-faulting
Phase disturbing signal decanting point, test simulation failure in 0.1s A phases through different transition resistances there is a situation where singlephase earth fault,
Test of accuracy is carried out to the localization method.
The embodiment of the present invention may be employed to neutral point earth-free small current neutral grounding system generation singlephase earth fault to carry
The single-phase grounded malfunction in grounded system of low current localization method of confession carries out fault location, and electric current is installed on each test point of power distribution network
Mutual inductor.Referring to attached drawing 2, its step are as follows：
Step 1：Acquisition system parameter judges system neutral ground state；
Step 2：Three-phase current at monitoring each test point of power distribution network in real time, monitors whether phase current at each test point occurs
Mutation, when judging that phase current is undergone mutation at certain test point, the failure phase of quick definite system jam；
The instantaneous rate of change of phase current mutation electric currentIt weighs (Δ t=1ms), is shown below：
WhenWhen, it is determined as that phase current is undergone mutation；WhenWhen, it is determined as that phase current is not undergone mutation, returns
Step 1 continues to monitor the state of phase current.
In embodiments of the present invention, singlephase earth fault occurs in 0.1s for A phases, as shown in Figure 4, Fig. 4 (a) (b) (c)
Occur larger waveform jump in 0.1s, illustrate to undergo mutation in the moment electric current.
Step 3：It calculates and records the virtual value of each detection point failure phase phase current when singlephase earth fault only occurs
ifRMS, calculate as shown in formula (1)：
Wherein, ifRMSThe virtual value of failure phase phase current during for singlephase earth fault only occurs, t are the time, and T is a work
Frequency cycle, i.e. 20ms,For fault current vector.
In the embodiment of the present invention by taking X0025 test points as an example, illustrate to detect the effective value calculating method of point failure phase phase current.
Calculate respectively and simulating, verifying A phases through transition resistance be 10 Ω, 100 Ω, 500 Ω, tri- kinds of situations ground connection when, detect point failure phase
Current effective value, such as attached drawing 4 (a) (b) (c) is shown respectively for test point curent change situation, the abscissa table of each reference axis in figure
Show the time, ordinate represents the size of current effective value.Wherein, t=0.2s is taken, T=0.02s, simulation result is as shown in table 1：
Table 1
Step 4：The leading phase of its failure phase is found through arc suppression coil system for neutral point, to isolated neutral system
System finds the lagging phase of its failure phase, injects disturbing signal to the phase searched out, continues 0.2s；
In embodiments of the present invention, system is isolated neutral system, should by 0.3s to lagging behind failure phase
B phases inject disturbing signal, which is realized by being closed the switch at decanting point XX0015, and closing period is
0.2s。
Step 5：It calculates and records each detection point failure phase phase current of isolated neutral system after injection disturbing signal
Virtual value ifzRMSOr it calculates and records each detection point failure of neutral by arc extinction coil grounding system after injection disturbing signal
The virtual value i of phase phase currentfcRMS；Shown in calculation formula such as formula (2) and formula (3)：
Wherein, ifzRMSFor after injection disturbing signal neutral point not compensated distribution network failure phase phase current it is effective
Value, ifcRMSFor the virtual value of neutral by arc extinction coil grounding system failure phase phase current after injection disturbing signal, t is the time, T
For a power frequency period, i.e. 20ms,WithFailure electricity when respectively without grounding through arc and through grounding through arc
Flow vector.
In the embodiment of the present invention by taking X0025 test points as an example, respectively calculate and simulating, verifying A phases transition resistance for 10 Ω,
In the case of 100 Ω, tri- kinds of 500 Ω, to B phases apply disturbing signal after test point faulted phase current virtual value, it was demonstrated that apply to B phases
Disturbing signal can obtain effective test point disturbing signal response sequence.Wherein take t=0.4s, T=0.02s, result of calculation row
It writes in table 2：
Table 2
Step 6：Ground signalling is disconnected, waits 0.2s；
In embodiments of the present invention, realized by the switch in 0.5s at disconnection detection point XX0015, disconnect and continuing
Time is 0.2s.
Step 7：Judge disturbing signal injection frequency n and the size of disturbing signal injection threshold number K；If n<K is then recorded
Disturbing signal injects frequency n=n+1, and return to step 4；Conversely, then complete disturbing signal injection；
In embodiments of the present invention, if defining K value is 6.Disturbing signal sequence is denoted as 10101010101, wherein applying disturbance
During signal, 1 is denoted as；Conversely, it is 0.
Step 8：Test point disturbing signal response sequence is formed, the sequence is according to test point after n-th application disturbing signal
The ratio between failure phase test point phase current virtual value determines when faulted phase current virtual value is with only occurring single-phase fault；The ratio is more than
Pre-set value, then n-th disturbing signal response is 1；Conversely, it is then 0；
In embodiments of the present invention, it is 1.2 to arrange ratio preset value according to the topological structure of circuit.It is preferably implemented other
In example, pre-set value can take the numerical value in 1.05~1.2 value ranges.The disturbing signal corresponding sequence that present example is formed
For 10101010101；Wherein, after applying disturbing signal for the first time, simulation result is in table 3:
Table 3
Step 9：Judge whether test point disturbing signal response sequence is identical with disturbing signal injection sequence；If identical,
The test point is located at fault section；Conversely, then the test point is located at normal reach.
In embodiments of the present invention, responded by comparing the disturbing signal in the disturbing signal sequence and step 8 in step 7
Sequence, it is known that X0025 test points are located at fault section.
Step 10：The judgement information of each test point is uploaded to main website, the topological structure of combined circuit completes system
Fault location；
The topological structure of combined circuit understands that the X0025 test points are determined for the failure of earth-free small current neutral grounding system
Site, it was demonstrated that the accuracy of the pouring-in low current fault localization method of disturbing signal.
The embodiment of the present invention proposes disturbing signal foundation neutral point situation by adaptively selected to a certain non-faulting phase
The Fault Locating Method of injection, is improved the method for the previous prior art, improves the standard of pouring-in fault location well
True property has higher practical value in engineering.
Embodiment three：
Fig. 5 is single-phase grounded malfunction in grounded system of low current alignment system schematic diagram provided in an embodiment of the present invention.
With reference to Fig. 5, single-phase grounded malfunction in grounded system of low current alignment system includes：
Acquiring unit 10, for obtaining the line state information of system parameter message and each test point；
First judging unit 20, for according to the line state information failure judgement phase line, and to non-faulting phase line
Disturbing signal is injected on road；
Second judgment unit 30 for forming disturbing signal response sequence using the disturbing signal, and is disturbed according to described
Dynamic signal response sequence judges whether the test point is located at fault section；
Line selection and location unit 40 is uploaded to main website for will determine that result forms test point report, and according to line topological
Structure completes line selection and location.
Further, the first judging unit 20 includes：
3rd judging unit (not shown), for judging system neutral ground state according to the system parameter message,
Wherein, the neutral ground state is included whether through grounding through arc；
4th judging unit (not shown), in the case of through grounding through arc, being believed according to the line status
Breath judge the system whether single-phase earthing；
First recording unit (not shown), in the case of single-phase earthing, recording the phase of failure phase line electricity
Flow the first virtual value；
Signal injection unit (not shown) for applying the disturbing signal to the phase for being ahead of failure phase, continues
The disturbing signal is disconnected after 0.2s, wherein, the disturbing signal is ground signalling；
Second recording unit (not shown) applies the phase current of the failure phase line after the disturbing signal for record
Second virtual value；
Timing unit (not shown), for after stopping applying the disturbing signal, waiting 0.2s.
Further, second judgment unit 30 includes：
Computing unit (not shown), for according to the second virtual value of the phase current after the application disturbing signal or institute
The ratio of the first virtual value of phase current when stating the 3rd virtual value of phase current and the single-phase earthing only occurs determines described
Disturbing signal response sequence；
5th judging unit (not shown), for judging the injection sequence of the disturbing signal response sequence and disturbing signal
Whether identical, if identical, the test point is located at the fault section；If it is different, then the test point is located at normally
Section.
Single-phase grounded malfunction in grounded system of low current alignment system provided in an embodiment of the present invention is provided with above-described embodiment
Single-phase grounded malfunction in grounded system of low current localization method have identical technical characteristic, so can also solve identical technology
Problem reaches identical technique effect.
The single-phase grounded malfunction in grounded system of low current localization method and the computer of system that the embodiment of the present invention is provided
Program product, the computer readable storage medium including storing program code, the instruction that said program code includes can be used for
The method described in previous methods embodiment is performed, specific implementation can be found in embodiment of the method, and details are not described herein.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description
With the specific work process of device, the corresponding process in preceding method embodiment is may be referred to, details are not described herein.
If the function is realized in the form of SFU software functional unit and is independent production marketing or in use, can be with
It is stored in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words
The part contribute to the prior art or the part of the technical solution can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, is used including some instructions so that a computer equipment (can be
People's computer, server or network equipment etc.) perform all or part of the steps of the method according to each embodiment of the present invention.
And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic disc or CD.
In addition, term " first ", " second ", " the 3rd " are only used for description purpose, and it is not intended that instruction or implying phase
To importance.
Finally it should be noted that：Embodiment described above is only the specific embodiment of the present invention, to illustrate the present invention
Technical solution, rather than its limitations, protection scope of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that：Any one skilled in the art
In the technical scope disclosed by the present invention, can still modify to the technical solution recorded in previous embodiment or can be light
It is readily conceivable that variation or equivalent substitution is carried out to which part technical characteristic；And these modifications, variation or replacement, do not make
The essence of appropriate technical solution departs from the spirit and scope of technical solution of the embodiment of the present invention, should all cover the protection in the present invention
Within the scope of.Therefore, protection scope of the present invention described should be subject to the protection scope in claims.
Claims (10)
1. a kind of single-phase grounded malfunction in grounded system of low current localization method, which is characterized in that including：
Obtain the line state information of system parameter message and each test point；
It is adaptively selected mutually to inject disturbing signal to non-faulting according to the line state information failure judgement phase line；
Disturbing signal response sequence is formed using the disturbing signal, and the inspection is judged according to the disturbing signal response sequence
Whether measuring point is located at fault section；
It will determine that result forms test point report and is uploaded to main website, and line selection and location completed according to wire topologies.
2. single-phase grounded malfunction in grounded system of low current localization method according to claim 1, which is characterized in that according to institute
State line state information failure judgement phase line, it is adaptively selected mutually to inject disturbance information to non-faulting and include：
System neutral ground state is judged according to the system parameter message, wherein, the neutral ground state is including being
It is no through grounding through arc；
If through grounding through arc, judge whether the arc suppression coil is undercompensation state, and under non-undercompensation state,
According to the line state information judge the system whether single-phase earthing；
If single-phase earthing, then the first virtual value of phase current of the failure phase line is recorded；
Apply the disturbing signal to the phase for being ahead of failure phase, the disturbing signal is disconnected after continuing 0.2s, wherein, it is described
Disturbing signal is the ground resistance signal of resistance value of being self-regulated；
Record applies the second virtual value of phase current of the failure phase line after the disturbing signal；
Stop after applying the disturbing signal, wait 0.2s.
3. single-phase grounded malfunction in grounded system of low current localization method according to claim 2, which is characterized in that also wrap
It includes：
If without grounding through arc or through grounding through arc and under the undercompensation state, according to the circuit
Status information judge the system whether single-phase earthing；
If single-phase earthing, then the phase current virtual value of the failure phase line is recorded；
Apply the disturbing signal to the phase for lagging behind failure phase, the disturbing signal is disconnected after continuing 0.2s, wherein, it is described
Disturbing signal is the ground resistance signal of resistance value of being self-regulated；
Record applies the 3rd virtual value of phase current of the failure phase line after the disturbing signal；
Stop after applying the disturbing signal, wait 0.2s.
4. single-phase grounded malfunction in grounded system of low current localization method according to claim 1, which is characterized in that described
It is adaptively selected after non-faulting mutually injects disturbing signal, it is described using the disturbing signal formed disturbing signal response sequence
Before, further include：
Judge whether the number for applying the disturbing signal is more than predetermined threshold value, wherein, the predetermined threshold value is believed for the disturbance
Number injection threshold number；
If less than the predetermined threshold value, then circulate operation is carried out according to continuing to inject the disturbing signal, and record and follow every time
Ring operating result.
5. the single-phase grounded malfunction in grounded system of low current localization method according to Claims 2 or 3, which is characterized in that institute
It states and forms disturbing signal response sequence using the disturbing signal, and the detection is judged according to the disturbing signal response sequence
Whether point includes positioned at fault section：
According to the second virtual value of the phase current after the application disturbing signal or the 3rd virtual value of the phase current with only sending out
The phase current the first virtual value ratio calculated during the raw single-phase earthing, and determine the disturbing signal response sequence；
Judge whether the injection sequence of the disturbing signal response sequence and disturbing signal is identical；
If identical, the test point is located at the fault section；
If it is different, then the test point is located at normal reach.
6. single-phase grounded malfunction in grounded system of low current localization method according to claim 5, which is characterized in that the line
Line state information includes the three-phase current of each test point, judges whether the system is single-phase according to the line state information
Ground connection includes：
Phase current mutation parameter is calculated according to the three-phase current of each test point；
By the phase current mutation parameter compared with default value, when the phase current mutation parameter is more than or equal to described
Default value then judges that the phase current is undergone mutation.
7. a kind of single-phase grounded malfunction in grounded system of low current alignment system, which is characterized in that including：
Acquiring unit, for obtaining the line state information of system parameter message and each test point；
First judging unit, for according to the line state information failure judgement phase line, and to adaptively selected non-therefore
Hinder phase line injection disturbing signal；
Second judgment unit, for forming disturbing signal response sequence using the disturbing signal, and according to the disturbing signal
Response sequence judges whether the test point is located at fault section；
Line selection and location unit is uploaded to main website for will determine that result forms test point report, and complete according to wire topologies
Into line selection and location.
8. single-phase grounded malfunction in grounded system of low current alignment system according to claim 7, which is characterized in that described
One judging unit includes：
3rd judging unit, for judging system neutral ground state according to the system parameter message, wherein, the neutrality
Point ground state is included whether through grounding through arc；
4th judging unit, in the case of through grounding through arc, judging the system according to the line state information
System whether single-phase earthing；
First recording unit, in the case of single-phase earthing, recording the first virtual value of phase current of the failure phase line；
Signal injection unit, for applying the disturbing signal to the phase for being ahead of failure phase, persistently after 0.2s described in disconnection
Disturbing signal, wherein, the disturbing signal is ground signalling；
Second recording unit applies the second virtual value of phase current of the failure phase line after the disturbing signal for record；
Timing unit, for after stopping applying the disturbing signal, waiting 0.2s.
9. single-phase grounded malfunction in grounded system of low current alignment system according to claim 7, which is characterized in that described
Two judging units include：
Computing unit, for according to apply the second virtual value of phase current after the disturbing signal or the 3rd virtual value of phase current with
The first virtual value of phase current when single-phase earthing only occurs calculates ratio, determines the disturbing signal response sequence；
5th judging unit, for judging whether the injection sequence of the disturbing signal response sequence and disturbing signal is identical, such as
Fruit is identical, then the test point is located at the fault section；If it is different, then the test point is located at normal reach.
10. single-phase grounded malfunction in grounded system of low current alignment system according to claim 8, which is characterized in that described
Line state information includes the three-phase current of each test point, and the 4th judging unit includes：
Phase current mutation parameter is calculated according to the three-phase current of each test point；
By the phase current mutation parameter compared with default value, when the phase current mutation parameter is more than or equal to described
Default value then judges that the phase current is undergone mutation.
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