CN107589346A - The method that power distribution network realizes fault location and boundary by fault detector - Google Patents
The method that power distribution network realizes fault location and boundary by fault detector Download PDFInfo
- Publication number
- CN107589346A CN107589346A CN201710983236.5A CN201710983236A CN107589346A CN 107589346 A CN107589346 A CN 107589346A CN 201710983236 A CN201710983236 A CN 201710983236A CN 107589346 A CN107589346 A CN 107589346A
- Authority
- CN
- China
- Prior art keywords
- sequence current
- test point
- transient zero
- amplitude
- fault
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Abstract
The invention discloses the method that power distribution network realizes fault location and boundary by fault detector, purpose is to provide the method that power distribution network realizes fault location and boundary by fault detector, solve when low current singlephase earth fault occurs for system, fault current very little, fault-signal is faint, cause fault detect, route selection, positioning it is all highly difficult the problem of comprise the following steps：The transient zero-sequence current of each test point on each bar circuit in bus exit is gathered, when line failure, transient zero-sequence current is undergone mutation；The amplitude of the transient zero-sequence current of each test point on each bar circuit is calculated, selects the circuit of at least three transient zero-sequence current amplitude maximums；Low current grounding positioning is carried out according to the situation of change of the transient zero-sequence current amplitude of each test point on the circuit selected in the step D.It is an advantage of the invention that：The circuit without line selection device for low current in station is overcome, the on-line monitoring of failure can be realized, timely find abort situation.
Description
Technical field
The present invention relates to a kind of Fault Locating Method, and in particular to power distribution network by fault detector realize fault location and
The method of boundary.
Background technology
To the year two thousand twenty, key city (area) intelligent construction and application level greatly improve, and power supply reliability reaches
99.99%, the average annual power off time of user is no more than 1 hour, and power supply quality is reached advanced world standards；Urban Areas power supply capacity
And power supply safety level is obviously improved, power supply reliability reaches more than 99.88%, and it is small that the average annual power off time of user is no more than 10
When, ensure that regional economy society is fast-developing；Comprehensively solve power network weakness problem rural and from far-off regions, substantially eliminate long-term
" low-voltage ", capacity of distribution transform is not less than 2 kilovolt-amperes per family, the effective guarantee people's livelihood.Power distribution network have it is complicated, duty factor relatively point
The characteristics of dissipating, the probability that transmission line of electricity breaks down is very high, especially the singlephase earth fault of small current system.When system occurs
During low current singlephase earth fault, fault current very little, fault-signal is faint, causes fault detect, route selection, positioning all very tired
It is difficult.After low current grounding occurs for circuit, three-phase voltage is still symmetrical, so system can run 1~2h, or even it is longer when
Between, the reliability of power supply can be improved.But tape jam is unable to longtime running, if run time is long to easily cause phase fault
Failure, the harm brought to power system are more serious.As can be seen here, the position of singlephase earth fault is found in time, and in time
Processing, to improving power supply reliability, ensureing that controller switching equipment tool safe for operation is of great significance.
The content of the invention
The technical problems to be solved by the invention are that fault current is very when low current singlephase earth fault occurs for system
Small, fault-signal is faint, causes fault detect, route selection, positioning all highly difficult, and it is an object of the present invention to provide power distribution network passes through indicating fault
The method that device realizes fault location and boundary, solve when low current singlephase earth fault occurs for system, fault current very little, therefore
Hinder weak output signal, cause fault detect, route selection, position the problem of all highly difficult.
The present invention is achieved through the following technical solutions：
The method that power distribution network realizes fault location and boundary by fault detector, comprises the following steps：
A：The threshold value I for setting feeder terminal unit to startst；
B：The threshold value that the transient zero-sequence current for gathering each test point in bus exit is started with feeder terminal unit
IstContrasted, judge whether the entry condition for meeting feeder terminal unit；
C：The feeder terminal unit starts if condition is met, records fault message and enters step D progress in next step
Processing and calculating；
D：The amplitude of the transient zero-sequence current of each test point on each bar circuit is calculated, selects at least three transient zero-sequence electricity
Flow the circuit of amplitude maximum；
E：Entered according to the situation of change of the transient zero-sequence current amplitude of each test point on the circuit selected in the step D
Row low current grounding positions.
The step A is specially：Using the virtual value of capacitance current between test point i downstream lines and the earth as threshold
Value, the threshold value I that feeder terminal unit startsstFor：Ist=KrelI0i, I0i=3 ω U0iC0i；Wherein：KrelFor coefficient of reliability；
I0iThe virtual value of capacitance current between test point i downstream lines and the earth；U0iFor the virtual value of test point i residual voltage；
C0iFor the electric capacity between test point i downstream lines and the earth.
The entry condition for judging whether to meet feeder terminal unit in the step B is specially：It will be gathered in sampling window
To each bar route in bus exit on each test point transient zero-sequence current and threshold value IstCompare, if continuous at 3
The transient zero-sequence current amplitude for having 2 and above test point in the transient zero-sequence current of test point is more than threshold value Ist, then feeder line
Terminal installation starts and records fault message；Otherwise feeder terminal unit does not start, and continues to sample transient zero-sequence current.
The amplitude of the transient zero-sequence current of each test point on each bar circuit is calculated in the step D, selects at least three
The method of the circuit of transient zero-sequence current amplitude maximum is：Calculate the amplitude I that failure starts transient zero-sequence current in rear T0f；Than
The transient zero-sequence current amplitude I of each test point on more each bar routef, select at least three transient zero-sequence current amplitude IfIt is larger
Circuit
Wherein, IfFor the amplitude of transient zero-sequence current；i0It is test point i in T0Interior transient zero-sequence current value.
The step E is specially：The test point for occurring being mutated in transient zero-sequence current amplitude on the circuit of selection jumps
Become, calculate the amplitude of the transient zero-sequence current of test point in the border area section that occurs to jump at left and right sides of the test point；When generation transition
A transient zero-sequence current amplitude I left sides for the right test points for left side of the transient zero-sequence current amplitude I of test point on the right side of section
When 50%, i.e. the I right sides=0.5I is left, then the circuit is faulty line, and transition point is exactly trouble point.
The present invention compared with prior art, has the following advantages and advantages：
1st, power distribution network of the present invention realizes fault location and the method for boundary by fault detector, overcomes in station without small electricity
The circuit of line selection apparatus is flowed, the on-line monitoring of failure can be realized, timely find abort situation；
2nd, power distribution network of the present invention realizes fault location and the method for boundary by fault detector, only utilizes transient zero-sequence electricity
Signal is flowed, applied widely, method is simple and easily realizes.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is schematic flow sheet of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment, the present invention is made
Further to describe in detail, exemplary embodiment of the invention and its explanation are only used for explaining the present invention, are not intended as to this
The restriction of invention.
Embodiment 1
The method that power distribution network of the present invention realizes fault location and boundary by fault detector, comprises the following steps：
A：The threshold value I for setting feeder terminal unit to startst；
B：The threshold value that the transient zero-sequence current for gathering each test point in bus exit is started with feeder terminal unit
IstContrasted, judge whether the entry condition for meeting feeder terminal unit；
C：The feeder terminal unit starts if condition is met, records fault message and enters step D progress in next step
Processing and calculating；
D：The amplitude of the transient zero-sequence current of each test point on each bar circuit is calculated, selects at least three transient zero-sequence electricity
Flow the circuit of amplitude maximum；
E：Entered according to the situation of change of the transient zero-sequence current amplitude of each test point on the circuit selected in the step D
Row low current grounding positions.
The step A is specially：Using the virtual value of capacitance current between test point i downstream lines and the earth as threshold
Value, the threshold value I that feeder terminal unit startsstFor：Ist=KrelI0i, I0i=3 ω U0iC0i；Wherein：KrelFor coefficient of reliability；
I0iThe virtual value of capacitance current between test point i downstream lines and the earth；U0iFor the virtual value of test point i residual voltage；
C0iFor the electric capacity between test point i downstream lines and the earth.
The entry condition for judging whether to meet feeder terminal unit in the step B is specially：It will be gathered in sampling window
To each bar route in bus exit on each test point transient zero-sequence current and threshold value IstCompare, if continuous at 3
The transient zero-sequence current amplitude for having 2 and above test point in the transient zero-sequence current of test point is more than threshold value Ist, then feeder line
Terminal installation starts and records fault message；Otherwise feeder terminal unit does not start, and continues to sample transient zero-sequence current.
The amplitude of the transient zero-sequence current of each test point on each bar circuit is calculated in the step D, selects at least three
The method of the circuit of transient zero-sequence current amplitude maximum is：Calculate the amplitude I that failure starts transient zero-sequence current in rear T0f；Than
The transient zero-sequence current amplitude I of each test point on more each bar routef, select at least three transient zero-sequence current amplitude IfIt is larger
Circuit
Wherein, IfFor the amplitude of transient zero-sequence current；i0It is test point i in T0Interior transient zero-sequence current value.
The step E is specially：The test point for occurring being mutated in transient zero-sequence current amplitude on the circuit of selection jumps
Become, calculate the amplitude of the transient zero-sequence current of test point in the border area section that occurs to jump at left and right sides of the test point；When generation transition
A transient zero-sequence current amplitude I left sides for the right test points for left side of the transient zero-sequence current amplitude I of test point on the right side of section
When 50%, i.e. the I right sides=0.5I is left, then the circuit is faulty line, and transition point is exactly trouble point.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.
Claims (5)
1. the method that power distribution network realizes fault location and boundary by fault detector, it is characterised in that comprise the following steps：
A：The threshold value I for setting feeder terminal unit to startst；
B：The threshold value I that the transient zero-sequence current for gathering each test point in bus exit is started with feeder terminal unitstEnter
Row contrast, judges whether the entry condition for meeting feeder terminal unit；
C：The feeder terminal unit starts if condition is met, records fault message and enters the place that step D carries out next step
Reason and calculating；
D：The amplitude of the transient zero-sequence current of each test point on each bar circuit is calculated, selects at least three transient zero-sequence current width
It is worth maximum circuit；
E：Carried out according to the situation of change of the transient zero-sequence current amplitude of each test point on the circuit selected in the step D small
Current earthing fault location.
2. the method that power distribution network according to claim 1 realizes fault location and boundary by fault detector, its feature
It is, the step A is specially：Using the virtual value of capacitance current between test point i downstream lines and the earth as threshold value, feedback
The threshold value I that line terminal installation startsstFor：Ist=KrelI0i, I0i=3 ω U0iC0i；Wherein：KrelFor coefficient of reliability；I0iFor
The virtual value of capacitance current between test point i downstream lines and the earth；U0iFor the virtual value of test point i residual voltage；C0iFor
Electric capacity between test point i downstream lines and the earth.
3. the method that power distribution network according to claim 1 realizes fault location and boundary by fault detector, its feature
It is, the entry condition for judging whether to meet feeder terminal unit in the step B is specially：By what is collected in sampling window
The transient zero-sequence current of each test point and threshold value I on each bar route in bus exitstCompare, if in 3 continuous detections
The transient zero-sequence current amplitude for having 2 and above test point in the transient zero-sequence current of point is more than threshold value Ist, then line feed terminals
Device starts and records fault message；Otherwise feeder terminal unit does not start, and continues to sample transient zero-sequence current.
4. the method that power distribution network according to claim 1 realizes fault location and boundary by fault detector, its feature
It is, the amplitude of the transient zero-sequence current of each test point on each bar circuit is calculated in the step D, selects at least three transient state
The method of the circuit of zero-sequence current amplitude maximum is：Calculate the amplitude I that failure starts transient zero-sequence current in rear T0f；Compare each
The transient zero-sequence current amplitude I of each test point on bar routef, select at least three transient zero-sequence current amplitude IfLarger line
Road
<mrow>
<msub>
<mi>I</mi>
<mi>f</mi>
</msub>
<mo>=</mo>
<msqrt>
<mrow>
<mfrac>
<mn>1</mn>
<msub>
<mi>T</mi>
<mn>0</mn>
</msub>
</mfrac>
<msubsup>
<mo>&Integral;</mo>
<mn>0</mn>
<msub>
<mi>T</mi>
<mn>0</mn>
</msub>
</msubsup>
<msup>
<msub>
<mi>i</mi>
<mn>0</mn>
</msub>
<mn>2</mn>
</msup>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>)</mo>
</mrow>
<mi>d</mi>
<mi>t</mi>
</mrow>
</msqrt>
</mrow>
Wherein, IfFor the amplitude of transient zero-sequence current；i0It is test point i in T0Interior transient zero-sequence current value.
5. the method that power distribution network according to claim 1 realizes fault location and boundary by fault detector, its feature
It is, the step E is specially：Transition occurs for the test point for occurring being mutated in transient zero-sequence current amplitude on the circuit of selection,
Calculate the amplitude of the transient zero-sequence current of test point in the border area section that occurs to jump at left and right sides of the test point；When generation transition section
When the transient zero-sequence current amplitude I right sides of the test point on right side are the transient zero-sequence current amplitude I of the test point in left side left 50%,
That is the I right sides=0.5I is left, then the circuit is faulty line, and transition point is exactly trouble point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710983236.5A CN107589346A (en) | 2017-10-20 | 2017-10-20 | The method that power distribution network realizes fault location and boundary by fault detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710983236.5A CN107589346A (en) | 2017-10-20 | 2017-10-20 | The method that power distribution network realizes fault location and boundary by fault detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107589346A true CN107589346A (en) | 2018-01-16 |
Family
ID=61053368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710983236.5A Withdrawn CN107589346A (en) | 2017-10-20 | 2017-10-20 | The method that power distribution network realizes fault location and boundary by fault detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107589346A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298288A (en) * | 2018-11-29 | 2019-02-01 | 中国矿业大学 | The distribution network failure section accurate positioning method of wide area zero-sequence current distributed intelligence |
| CN110501611A (en) * | 2019-08-26 | 2019-11-26 | 珠海许继电气有限公司 | A kind of power distribution network complete fibre Fault Locating Method and system |
| CN111830365A (en) * | 2020-06-20 | 2020-10-27 | 青岛鼎信通讯股份有限公司 | Multi-transient statistical fault positioning method applied to power grid fault diagnosis |
| CN112114226A (en) * | 2020-08-17 | 2020-12-22 | 国家电网有限公司 | Power transmission line fault diagnosis method based on zero-sequence current detection technology |
-
2017
- 2017-10-20 CN CN201710983236.5A patent/CN107589346A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109298288A (en) * | 2018-11-29 | 2019-02-01 | 中国矿业大学 | The distribution network failure section accurate positioning method of wide area zero-sequence current distributed intelligence |
| CN110501611A (en) * | 2019-08-26 | 2019-11-26 | 珠海许继电气有限公司 | A kind of power distribution network complete fibre Fault Locating Method and system |
| CN110501611B (en) * | 2019-08-26 | 2021-07-06 | 珠海许继电气有限公司 | Full-line quick-action fault positioning method and system for power distribution network |
| CN111830365A (en) * | 2020-06-20 | 2020-10-27 | 青岛鼎信通讯股份有限公司 | Multi-transient statistical fault positioning method applied to power grid fault diagnosis |
| CN112114226A (en) * | 2020-08-17 | 2020-12-22 | 国家电网有限公司 | Power transmission line fault diagnosis method based on zero-sequence current detection technology |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107589346A (en) | The method that power distribution network realizes fault location and boundary by fault detector | |
| CN101598761B (en) | Fault line selection method for small electric current grounding system of distribution network | |
| CN102590655B (en) | Failure direction judgment element and judgment method for direct current transmission line | |
| CN104267311B (en) | Phase selection method for faults of double-circuit lines on same tower | |
| CN103424669B (en) | A kind of selection method utilizing fault feeder zero-sequence current matrix principal component analysis (PCA) first principal component | |
| CN102590654B (en) | Element and method for discriminating fault electrode of DC transmission line | |
| CN102427223B (en) | Method for judging lock by zero sequence voltage and current | |
| CN110021918B (en) | Single-phase short-circuit protection method for resistance-grounded power distribution network based on zero-sequence current ratio | |
| CN103278743B (en) | High-resistance grounding fault identifying and positioning method based on fault information | |
| CN103018627A (en) | Adaptive fault type fault line detection method for non-effectively earthed system | |
| CN102937687B (en) | Method for distinguishing disconnection fault and grounding fault during grounding of neutral point through small resistor | |
| CN102818973B (en) | Phase sequence voltage amplitude comparison-based failure phase selection method and device | |
| CN105098738A (en) | Pilot protection method of high-voltage direct current transmission line based on S transformation | |
| CN103018630A (en) | Single-phase earth fault transient line selection method of distribution network | |
| CN1141767C (en) | Earthing protection method for small current earthing system | |
| CN107589347A (en) | Single-phase earth fault discrimination method based on transient zero-sequence current | |
| CN107367669A (en) | The method that broken string transmission line of electricity is locked based on negative sequence network | |
| CN106771804B (en) | A kind of transmission line of electricity broken string area judging method based on zero-sequence network | |
| CN106602528A (en) | Transmission line breaking area judgment method based on two-side zero-sequence power direction | |
| CN106961248A (en) | Mix the photovoltaic system fault arc detection method of quadratic form time-frequency distributions feature and the analysis of self adaptation multiplicative function | |
| CN111641196A (en) | High-voltage direct-current line pilot protection method based on branch current characteristics | |
| CN205157709U (en) | Single -phase ground connection route selection system of dispatch end undercurrent | |
| CN109188209A (en) | AT power supply mode contact net ground fault recognition method | |
| CN105259480A (en) | Dispatching end small current single-phase grounding wire selection method and system | |
| CN107861023A (en) | fault locating method based on zero-sequence current |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180116 |