CN108181553A - A kind of small current neutral grounding system single-phase wire break fault section location method based on line voltage variation characteristic - Google Patents
A kind of small current neutral grounding system single-phase wire break fault section location method based on line voltage variation characteristic Download PDFInfo
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- CN108181553A CN108181553A CN201810061686.3A CN201810061686A CN108181553A CN 108181553 A CN108181553 A CN 108181553A CN 201810061686 A CN201810061686 A CN 201810061686A CN 108181553 A CN108181553 A CN 108181553A
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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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Abstract
The present invention relates to a kind of small current neutral grounding system single-phase wire break fault section location methods based on line voltage variation characteristic, suitable for isolated neutral mode power distribution network, belong to power distribution network relay protection field.After insulated conductor application, the probability that disconnection fault occurs increases, and existing single-phase wire break phase to phase fault Section Location has certain limitation, it is impossible in extensive utilization to distribution system.Overcome the deficiencies in the prior art of the present invention, comprehensively utilize the amplitude of line voltage and the changing rule of phase when single-phase wire break phase to phase fault occurs, fault section location is realized using existing distribution automation system platform or malfunction indicator system, utilize line feed terminals or fault detector gathering line voltage information, after reporting main website, generation and determining fault section by each test point line voltage information failure judgement of main website comprehensive analysis, adaptability is stronger, reliability higher, while there is very high engineering application value.
Description
Technical field
The present invention relates to a kind of small current neutral grounding system single-phase wire break fault section locations based on line voltage variation characteristic
Method suitable for small current neutral grounding mode power distribution network, belongs to power distribution network relay protection field.
Background technology
In power distribution network, disconnection fault has become one of common failure.Especially after insulated conductor application, due to
Electric arc cannot be moved arbitrarily, and crust cannot radiate in time, caused line temperature excessively high and be blown, and disconnection fault occur general
Rate increases.If line drop after broken string, people and animals' electric shock accidents easily occurs, but scene lacks effective detection technique measure.
Therefore when single-phase wire break failure occurs, how to be properly positioned failure and section occurs, it has also become power distribution network single-phase disconnection failure is determined
Position technical research and hot spot, the emphasis of application.
It is hanging that power distribution network broken string type can be divided into fracture, and three kinds of situations are grounded after ground connection and fracture before fracture.It is right at present
Have more analysis and research, but the analysis for single-phase wire break phase to phase fault and section in single-phase wire break and earth fault
The method of positioning is less.For example, the single-phase wire break fault zone determination method based on load monitor, single-phase by delimiting generation
The Probability Area of disconnection fault and impossible region, and set difference operation is made into two regions, so as to obtain minimum broken string region, but
It is that the accuracy of this method depends on the extensive layout of feeder load monitoring point.Changed using Trapezoid Fuzzy Number estimation distribution transformer load
The calculating of range and node current, and the possibility for being zero according to node current judge disconnection fault occur position method
Influenced by the circuit method of operation very big, reliability is poor.Disconnection fault selection method based on energy norm is matched by analysis
The general changing rule of negative-sequence current during power grid single-phase wire break failure, can judge the generation of disconnection fault, but cannot be right
Fault section is positioned.It can be seen that existing single-phase wire break phase to phase fault Section Location, has certain limitation, no
In energy extensive utilization to distribution system.
Invention content
The technical problem to be solved by the present invention is to：Overcome the deficiencies in the prior art, the earth-free event of comprehensive utilization single-phase wire break
The amplitude of line voltage and the changing rule of phase when barrier occurs provide a kind of reliability height, adaptable single-phase wire break does not connect
Earth fault Section Location.
The present invention technical solution be：
A kind of small current neutral grounding system single-phase wire break fault section of amplitude and phasing characteristics based on line voltage is determined
Position method is uploaded the amplitude and phase data of line voltage using several test points set in power circuit, is received simultaneously by main website
Fault section location judgement is carried out after processing, it is characterised in that：It is determined using the relationship between the amplitude and phase of each line voltage
Fault section residing for trouble point.
Relationship between the amplitude and phase using each line voltage determines the fault section residing for trouble point, tool
Body breakdown judge step is：
Step 1, the test point in busbar exit is denoted as test point 1, and adjacent test point is denoted as test point 2, and test point is compiled
Number progressively increase successively, the last one test point is denoted as test point n；
Step 2, test point 1 is labeled as k, at this time k=1；
Step 3, judge whether k values meet less than or equal to n, defining each line voltage at test point k respectively if meeting is Main website calculates the sum of amplitude that each line voltage is added two-by-two at test point k successively, respectively
It is defined asIf not satisfied, then judge fault section for inspection
Measuring point n is transferred to step 7 to the section between line end；
Step 4, it is respectively compared U at test point k1WithU2WithU3WithSize and θ1、θ2And θ3Between
Relationship；
Step 5, if meetingAnd θ1=θ2± 2m π=θ3± (2m+1) π (m is integer), then can be determined that broken string
It is mutually B phases；If meetAnd θ2=θ3± 2m π=θ1± (2m+1) π (m is integer), then can be determined that broken string is mutually C
Phase；If meetAnd θ3=θ1± 2m π=θ2± (2m+1) π (m is integer), then can be determined that broken string is mutually A phases；It is if full
Any one of sufficient above three condition, then be transferred to step 6；Otherwise k adds 1 automatically, continues to execute step 3；
Step 6, section of the judgement fault section between test point k and test point k-1；
Step 7, terminate to judge, determine fault section.
Compared with prior art, a kind of single-phase wire break fault section location side based on line voltage variation characteristic of the invention
It is had the beneficial effect that possessed by method：
The present invention can utilize existing distribution automation system platform or malfunction indicator system to realize, that is, utilize feedback
Line terminal (FTU) or fault detector (FI) gathering line voltage information, after reporting main website, by each test point of main website comprehensive analysis
The generation of line voltage information failure judgement simultaneously determines fault section.Adaptability is stronger, reliability higher, while has very high work
Journey application value.
Description of the drawings
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings：
Attached drawing 1 is a kind of fault location flow of the single-phase wire break fault section location method based on line voltage variation characteristic
Figure；
Attached drawing 2 is detected for a kind of faulty line of single-phase wire break fault section location method based on line voltage variation characteristic
Point distribution map；
Attached drawing 3 is a kind of system construction drawing of the single-phase wire break fault section location method based on line voltage variation characteristic；
Attached drawing 4 is S in attached system shown in Figure 34Line voltage simulation waveform at test point.
Specific embodiment
To achieve the above object, the present invention can be realized with following technical proposals：
Attached drawing 1~4 is the preferred example of the present invention, and 1~4 the present invention will be further described below in conjunction with the accompanying drawings：
For single-phase wire break phase to phase fault, existing single-phase wire break phase to phase fault Section Location has certain
Limitation, it is impossible in extensive utilization to distribution system.Overcome the deficiencies in the prior art of the present invention comprehensively utilizes single-phase wire break
The amplitude of the line voltage and changing rule of phase when phase to phase fault occurs, using existing distribution automation system platform or
Person's malfunction indicator system realizes fault section location, that is, utilizes line feed terminals (FTU) or fault detector (FI) gathering line
Information of voltage, after reporting main website, generation and determining failure by each test point line voltage information failure judgement of main website comprehensive analysis
Section.
As shown in Fig. 2, from busbar exit between load, one test point is set every a distance, it is two neighboring
Several sections are formed between test point.After single-phase wire break phase to phase fault occurs, main website receives each fault detecting point and uploads
Line voltage amplitude and phase data information and successively to each section carry out location determination, until find out failure generation area
Section.
As shown in Figure 1, its specific judgment step is as follows：
Step 1, the test point in busbar exit is denoted as test point 1, and adjacent test point is denoted as test point 2, and test point is compiled
Number progressively increase successively, the last one test point is denoted as test point n；
Step 2, test point 1 is labeled as k, at this time k=1；
Step 3, judge whether k values meet less than or equal to n, defining each line voltage at test point k respectively if meeting is Main website calculates the sum of amplitude that each line voltage is added two-by-two at test point k successively, respectively
It is defined asIf not satisfied, then judge fault section for inspection
Measuring point n is transferred to step 7 to the section between line end；
Step 4, it is respectively compared U at test point k1WithU2WithU3WithSize and θ1、θ2And θ3Between
Relationship；
Step 5, if meetingAnd θ1=θ2± 2m π=θ3± (2m+1) π (m is integer), then can be determined that broken string
It is mutually B phases；If meetAnd θ2=θ3± 2m π=θ1± (2m+1) π (m is integer), then can be determined that broken string is mutually C
Phase；If meetAnd θ3=θ1± 2m π=θ2± (2m+1) π (m is integer), then can be determined that broken string is mutually A phases；It is if full
Any one of sufficient above three condition, then be transferred to step 6；Otherwise k adds 1 automatically, continues to execute step 3；
Step 6, section of the judgement fault section between test point k and test point k-1；
Step 7, terminate to judge, determine fault section.
As shown in figure 3, a whole set of detecting system is made of three parts：It is distributed in the detection device of each test point (herein
It is assumed that being all FTU), main website, each detection device of contact and main website communication system.L1、L2、L3、L44 for busbar 1 go out
Line, wherein line length are respectively L1=3km, L2=8.5km, L3=12km, L4=10km.S1、S2、S3、S'1、S'2、S'3For
Block switch, K are interconnection switch.Assuming that it is break point that system A phases, which break and set F, break point is located in faulty line
Between (away from busbar distance be this line length 50%).In such a system, the positive order parameter of the correlation of overhead transmission line is：Z1=
(0.17+j0.38) Ω/km, b1=(j3.045) us/km.Zero sequence parameter is Z0=(0.23+j1.72) Ω/km, b0=
(j1.884)us/km.Load is connected using triangle, and each line equivalent load impedance is used uniformly Zl=400 Ω.Utilize this
System verifies the validity of above-mentioned fault section location method.
During system normal operation, when the amplitude of line voltage is with phase changing capacity very little, not up to definite value, FTU will not start.
As generation single-phase wire break phase to phase fault (such as S3、S4Between A phase disconnection faults phase to phase fault occurs) when, each FTU
Continuous gathering line voltage information simultaneously detects 1/2 of the line voltage amplitude between certain two-phase less than or equal to line voltage before failure, then
Line voltage amplitude with time tag and phase information are reported main website by FTU.Main website is collected into electric substation's line selection apparatus and each
After a FTU fault messages, it is confirmed whether that single-phase wire break phase to phase fault occurs according to the information of voltage of line selection apparatus, for disturbance
Then exit.As shown in Figure 3, it is assumed that 4 test points between busbar and load are set altogether, and assume S3With S4Between occur A phases break
Failure phase to phase fault then positions single-phase wire break phase to phase fault using following steps：
Main website first judges the upstream zone of test point 1, i.e., k=1 at this time.Main website calculates 1 each line of test point electricity
The sum of amplitude being added two-by-two is pressed, is respectively defined asRespectively
Compare U1WithU2WithU3WithSize and θ1、θ2And θ3Between relationship.It is unsatisfactory forAnd θ1=
θ2± 2m π=θ3± (2m+1) π (m is integer),And θ2=θ3± 2m π=θ1± (2m+1) π (m is integer),And θ3=θ1± 2m π=θ2Any one in three conditions of ± (2m+1) π (m is integer), the upstream of test point 1
Section is perfects section.
K at this time<4, k values add 1 automatically, at this time k=2, and main website enters between next section, that is, test point 2 and test point 1
Section is judged.It is unsatisfactory forAnd θ1=θ2± 2m π=θ3± (2m+1) π (m is integer),And θ2=θ3
± 2m π=θ1± (2m+1) π (m is integer),And θ3=θ1± 2m π=θ2Three conditions of ± (2m+1) π (m is integer)
In any one, section between test point 2 and test point 1 is perfects section.
K at this time<4, k values add 1 automatically, at this time k=3, and main website enters between next section, that is, test point 3 and test point 2
Section is judged.It is unsatisfactory forAnd θ1=θ2± 2m π=θ3± (2m+1) π (m is integer),And θ2=θ3
± 2m π=θ1± (2m+1) π (m is integer),And θ3=θ1± 2m π=θ2Three conditions of ± (2m+1) π (m is integer)
In any one, section between test point 3 and test point 2 is perfects section.
K at this time<4, k values add 1 automatically, at this time k=4, and main website enters between next section, that is, test point 4 and test point 3
Section is judged.As shown in Fig. 4 system emulation oscillograms,WithAmplitude is equal, and phase is identical, and the two amplitude is
Half, phase withOn the contrary, sampled value is hereinIt can
See satisfactionAnd θ3=θ1=θ2+ π, so as to judge that broken string is mutually A phases, and the area between test point 4 and test point 3
Section is fault section.
Disconnection information, and automatic or manual machine in due course instruction disconnection detection point 3 and inspection are reported in a variety of manners by main website
Measuring point 4 switchs and is closed interconnection switch, ensures that isolated fault section is overhauled, while do not influence to perfect the power supply of section.
When failure is located at other sections, it is located at S with failure3、S4Between it is similar, no longer repeat one by one.
It is to determine failure using the variation characteristic of fracture downstream line voltage after the generation of single-phase wire break phase to phase fault above
The localization method of the residing fault section of point.
The above is only presently preferred embodiments of the present invention, is not that the invention has other forms of limitations, any ripe
Know the equivalent reality that professional and technical personnel was changed or be modified as equivalent variations possibly also with the technology contents of the disclosure above
Apply example.But it is every without departing from technical solution of the present invention content, what technical spirit according to the present invention made above example
Any simple modification, equivalent variations and remodeling still fall within the protection domain of technical solution of the present invention.
Claims (1)
1. a kind of small current neutral grounding system single-phase wire break fault section location method based on line voltage variation characteristic, utilizes electric power
The line voltage amplitude and the data information of phase that several test points set in circuit upload, carry out after being received and processed by main website
Fault location judges, it is characterised in that：Specifically breakdown judge step is：
Step 1, the test point in busbar exit is denoted as test point 1, and adjacent test point is denoted as test point 2, and test point number according to
Secondary to progressively increase, the last one test point is denoted as test point n；
Step 2, test point 1 is labeled as k, at this time k=1；
Step 3, judge whether k values meet less than or equal to n, defining each line voltage at test point k respectively if meeting is Main website calculates the sum of amplitude that each line voltage is added two-by-two at test point k successively, fixed respectively
Justice is If not satisfied, then judge fault section for test point n
To the section between line end, it is transferred to step 7；
Step 4, it is respectively compared U at test point k1WithU2WithU3WithSize and θ1、θ2And θ3Between pass
System；
Step 5, if meetingAnd θ1=θ2± 2m π=θ3± (2m+1) π (m is integer), then can be determined that broken string is mutually B
Phase；If meetAnd θ2=θ3± 2m π=θ1± (2m+1) π (m is integer), then can be determined that broken string is mutually C phases；It is if full
FootAnd θ3=θ1± 2m π=θ2± (2m+1) π (m is integer), then can be determined that broken string is mutually A phases；If meet above-mentioned
Any one of three conditions, then be transferred to step 6；Otherwise k adds 1 automatically, continues to execute step 3；
Step 6, section of the judgement fault section between test point k and test point k-1；
Step 7, terminate to judge, determine fault section.
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| CN201810061686.3A CN108181553A (en) | 2018-01-23 | 2018-01-23 | A kind of small current neutral grounding system single-phase wire break fault section location method based on line voltage variation characteristic |
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Cited By (10)
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| CN111579927A (en) * | 2020-05-22 | 2020-08-25 | 南京南瑞继保电气有限公司 | Disconnection protection judgment method and device suitable for single-side power transmission line |
| CN111679157A (en) * | 2020-07-31 | 2020-09-18 | 广东电网有限责任公司 | Method for positioning single-phase disconnection and load side grounding fault section of neutral point ungrounded system |
| CN112015160A (en) * | 2019-05-31 | 2020-12-01 | 北京新能源汽车股份有限公司 | Fault temperature determination method and device |
| CN112557810A (en) * | 2020-11-10 | 2021-03-26 | 国网天津市电力公司 | Power distribution network fault diagnosis and positioning method based on flexible switch |
| CN112595923A (en) * | 2020-11-24 | 2021-04-02 | 国网河南省电力公司电力科学研究院 | Positioning method for single-phase disconnection fault section of ungrounded system of power distribution network |
| CN113203915A (en) * | 2021-04-16 | 2021-08-03 | 国网宁夏电力有限公司电力科学研究院 | Multi-source information fusion power distribution network single-phase line fault analysis method |
| CN113484661A (en) * | 2021-05-26 | 2021-10-08 | 贵州电网有限责任公司 | 10kV distribution line single-phase line break fault direction detection method and system based on line voltage change information |
| CN113484659A (en) * | 2021-05-26 | 2021-10-08 | 贵州电网有限责任公司 | 10kV distribution line single-phase line break fault direction detection method and device based on phase voltage change information |
| CN114236306A (en) * | 2021-11-09 | 2022-03-25 | 珠海许继芝电网自动化有限公司 | Distribution line interval insulation degradation degree evaluation method and system based on distribution main station |
| CN114487709A (en) * | 2022-01-27 | 2022-05-13 | 国网江苏省电力有限公司南通供电分公司 | Power distribution network disconnection fault diagnosis method and system based on PT sliding combination electricity taking method |
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| CN111579927A (en) * | 2020-05-22 | 2020-08-25 | 南京南瑞继保电气有限公司 | Disconnection protection judgment method and device suitable for single-side power transmission line |
| CN111679157A (en) * | 2020-07-31 | 2020-09-18 | 广东电网有限责任公司 | Method for positioning single-phase disconnection and load side grounding fault section of neutral point ungrounded system |
| CN112557810A (en) * | 2020-11-10 | 2021-03-26 | 国网天津市电力公司 | Power distribution network fault diagnosis and positioning method based on flexible switch |
| CN112595923A (en) * | 2020-11-24 | 2021-04-02 | 国网河南省电力公司电力科学研究院 | Positioning method for single-phase disconnection fault section of ungrounded system of power distribution network |
| CN113203915A (en) * | 2021-04-16 | 2021-08-03 | 国网宁夏电力有限公司电力科学研究院 | Multi-source information fusion power distribution network single-phase line fault analysis method |
| CN113484661A (en) * | 2021-05-26 | 2021-10-08 | 贵州电网有限责任公司 | 10kV distribution line single-phase line break fault direction detection method and system based on line voltage change information |
| CN113484659A (en) * | 2021-05-26 | 2021-10-08 | 贵州电网有限责任公司 | 10kV distribution line single-phase line break fault direction detection method and device based on phase voltage change information |
| CN114236306A (en) * | 2021-11-09 | 2022-03-25 | 珠海许继芝电网自动化有限公司 | Distribution line interval insulation degradation degree evaluation method and system based on distribution main station |
| CN114487709A (en) * | 2022-01-27 | 2022-05-13 | 国网江苏省电力有限公司南通供电分公司 | Power distribution network disconnection fault diagnosis method and system based on PT sliding combination electricity taking method |
| CN114487709B (en) * | 2022-01-27 | 2023-08-11 | 国网江苏省电力有限公司南通供电分公司 | PT sliding combination power taking method-based power distribution network disconnection fault diagnosis method and system |
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