CN110082646A - T-link fault distance measurement and computer readable storage medium based on distribution curve along power-frequency voltage - Google Patents
T-link fault distance measurement and computer readable storage medium based on distribution curve along power-frequency voltage Download PDFInfo
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- CN110082646A CN110082646A CN201910464050.8A CN201910464050A CN110082646A CN 110082646 A CN110082646 A CN 110082646A CN 201910464050 A CN201910464050 A CN 201910464050A CN 110082646 A CN110082646 A CN 110082646A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
Abstract
The present invention provides a kind of T-link fault distance measurements based on distribution curve along power-frequency voltage, this method first determines whether the fault point currently broken down in which branch of T link, confirm that fault point F after branch where the end M, passes through the zero sequence power-frequency voltage of two branch ends where the N-terminal that does not break down, the end OWith zero sequence power current To calculate T contact zero sequence power-frequency voltage UTAnd T contact is in the electric current I of the end side MTIt is last to be calculated according to the end the M voltage being calculated, current parameters from voltage distribution curves along guilty culprit one end, and it could be used without T junction voltage, the current parameters that two end datas of failure are calculated and calculate from voltage distribution curves along the guilty culprit route of T contact, the two is calculated into the coaxial superimposed processing of voltage distribution curves along resulting, the intersection point of two curves is actual fault point position.
Description
Technical field
The present invention relates to T link fault detection technique application field, in particular to a kind of computer readable storage medium,
Computer-readable recording medium storage has computer program, realizes when computer program is executed by a controller and is based on power-frequency voltage edge
The T-link fault distance measurement of line distribution curve.
Background technique
T link is a kind of common line connection of 110kV and following voltage class.This martingale is simple,
Speed of application is fast, can effectively reduce equipment investment and save transmission of electricity corridor land used.But since the line connection is with defeated
The high feature of electrical power, once line failure, it is possible to it causes mostly to have a power failure, coverage is big, therefore, to looking in time
Demand to fault point and debugging is more urgent.
Fault localization main task is to pass through the parameters such as route measured current, voltage when the somewhere of route is broken down
To calculate the position of fault point.Currently, the difference of the signal frequency usually used according to Fault Location Algorithm is by power transmission line
Road fault distance-finding method is divided into two class of impedance method and traveling wave method.Impedance method is directly to calculate failure using the power frequency component after failure
The method of impedance or its percentage；Traveling wave rule is to use arteries and veins using after high frequency fault transient current, voltage traveling wave signal or failure
Rush the method that frequency modulated radar system etc. carrys out indirect judgement position of failure point.But impedance method fault localization can be after T contact
Failure, and traveling wave method can discontinuously cause fault point back wave to be difficult to differentiate because of T contact bring wave impedance.The presence of T contact
It will lead to track walker to be difficult to judge fault section and increase line walking blindness, the special wiring form of T link also results in
Conventional fault distance measuring method is difficult directly to carry out fault localization, can not quickly fault point position, caused very to troubleshooting
It is big difficult.
Summary of the invention
It is an object of the invention to: avoid above-mentioned shortcoming in the prior art and zero sequence work can be utilized by providing one kind
Distribution curve quickly, to be accurately positioned the T-link fault distance measurement of position of failure point along frequency voltage.
Mentality of designing of the invention is: after the failure occurred, fault point will destroy uniform transmission line as a kind of boundary
Continuity causes electromagnetic wave that catadioptric occurs in fault point, when this to calculate the power-frequency voltage of route by telegraph equation, meter
Work after the fault point that obtained fault point and its power-frequency voltage before are consistent with measured value, and are calculated
Frequency voltage differs greatly with actual measurement power-frequency voltage, this makes using the voltage distribution curves along the line being calculated by power-frequency voltage
Judge that the position of fault point will appear deviation, and since position of failure point is unknown, may be unexpected by deviation.And invention human hair
It is existing, although the branch to break down can not by single line voltage distribution distribution curve come accurate judgement position of failure point,
It is to be had only by power-frequency voltage along power-frequency voltage along T contact calculating gained and fault branch end calculating gained in fault point
The two is calculated the coaxial superimposed processing of voltage distribution curves along resulting by one intersection point, and the intersection point of two curves is practical event
Barrier point position.After verifying, it was demonstrated that this method accuracy with higher.
The purpose of the present invention is achieved through the following technical solutions:
T-link fault distance measurement based on distribution curve along power-frequency voltage is provided, is included the following steps:
Voltage's distribiuting obtaining step along the line calculates separately fault branch from T contact to branch end along line voltage
DistributionAnd the voltage's distribiuting along the line from branch end to T contact
The position of trouble spot judging step, the point of failure definition branch road is x, and x makes if it existsWithValue phase
Deng, then it is assumed that position x is the fault point F on fault branch.
Preferably, the voltage's distribiuting including along of voltage's distribiuting obtaining step along the lineObtaining step:
Wherein, UT、ITRespectively failure side power-frequency voltage and power current of the T contact relative to fault branch,For from
Hold the line length of T contact, ZcFor surge impedance of a line, γ is line Phases coefficient.
Preferably, using T contact be respectively relative to two fault-free branches power-frequency voltage average value as the failure
Side power-frequency voltage UTValue.
Preferably, according to the end power current of two fault-free branchesAnd power-frequency voltageIt calculates
The failure side power current IT:
Preferably, the voltage's distribiuting including along of voltage's distribiuting obtaining step along the lineObtaining step:
Wherein,WithRespectively power-frequency voltage and power current of the fault branch end relative to T contact,For from
Hold the line length of T contact, ZcFor surge impedance of a line, γ is line Phases coefficient.
Preferably, the fault branch judgment step including being executed before the voltage's distribiuting obtaining step along the line:
End power-frequency voltage/power current of T link all branches is obtained, if it exists power-frequency voltage/power frequency of branch
Power-frequency voltage/power current of electric current and other all branches is different from, then judges the branch for fault branch.
Preferably, in the fault branch judgment step, if it exists power-frequency voltage/power current of branch and two or
The power-frequency voltage of the above branch/power current difference exceeds preset threshold, then judges the branch for fault branch.
Preferably, in the trouble spot judging step, respectively according to voltage's distribiuting along the lineWithIt draws with x and is
The wherein voltage distribution curves along the line of the same reference axis of an axis judge that the intersection point is corresponding if two curve existence anduniquess intersection points
X position be fault point F.
Preferably, the power-frequency voltage is zero sequence power-frequency voltage, and the power current is zero sequence power current.
A kind of computer readable storage medium is also provided, which is stored with executable computer program, computer
It can be realized the above-mentioned T-link fault distance measurement based on distribution curve along power-frequency voltage when program is executed by a controller.
Beneficial effects of the present invention: it is somebody's turn to do the T-link fault distance measurement based on distribution curve along power-frequency voltage, first
Judge that the fault point currently broken down in which branch of T link, confirms that fault point F after branch where the end M, passes through
The zero sequence power-frequency voltage of two branch ends where the N-terminal that does not break down, the end OWith zero sequence power current To calculate T contact zero sequence power-frequency voltage UTAnd T contact is in the electric current I of the end side MT, last according to the end M being calculated electricity
Pressure, current parameters are calculated from voltage distribution curves along guilty culprit one end, and could be used without the both ends number of failure
It is calculated according to the T junction voltage, the current parameters that are calculated bent from voltage's distribiuting along the guilty culprit route of T contact
The two is calculated voltage distribution curves along resulting and coaxially handled by line, and the intersection point of two curves is actual fault point position.
This method process is simple, can quickly fault point position, after repeatedly surveying verifying, it was demonstrated that this method is with higher
Accuracy.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings, but the embodiment in attached drawing is not constituted to any limit of the invention
System, for those of ordinary skill in the art, without creative efforts, can also obtain according to the following drawings
Other attached drawings.
Fig. 1 is the T link schematic diagram based on the T-link fault distance measurement of distribution curve along power-frequency voltage.
Fig. 2 is two based on the fault branch of the T-link fault distance measurement of distribution curve along power-frequency voltage
The coaxial superimposed schematic diagram of voltage distribution curves.
Fig. 3 is the zero sequence power frequency electric based on the end fault branch M of the T link of distribution curve along zero sequence power-frequency voltage
Corrugating figure.
Fig. 4 is the zero sequence power frequency electric based on the end fault branch M of the T link of distribution curve along zero sequence power-frequency voltage
Flow waveform diagram.
Fig. 5 is the zero sequence power frequency voltage waveform based on the N-terminal of the T link of distribution curve along zero sequence power-frequency voltage
Figure.
Fig. 6 is the zero sequence power current waveform based on the N-terminal of the T link of distribution curve along zero sequence power-frequency voltage
Figure.
Fig. 7 is the zero sequence power frequency voltage waveform based on the end O of the T link of distribution curve along zero sequence power-frequency voltage
Figure.
Fig. 8 is the zero sequence power current waveform based on the end O of the T link of distribution curve along zero sequence power-frequency voltage
Figure.
Specific embodiment
The invention will be further described with the following Examples.
Three terminated line modes of T link are as shown in Figure 1, occur single-phase asymmetric ground fault, the end M is away from T on T link
Contact 130km, N-terminal is away from the T contact end 60km, O away from T contact 20km.Electric system recognizes T link and asymmetric ground connection event occurs
Barrier identifies the branch to break down by T link singlephase earth fault branch method of discrimination first, is then based on again by this
The T-link fault distance measurement of distribution curve obtains the accurate location of fault point F along power-frequency voltage.
(1) when judging fault branch, the zero sequence power-frequency voltage at tri- end T link O, M, N is measured respectivelyWith zero sequence work
Frequency electric currentWhereinUsual guilty culprit one end calculates that gained T contact zero sequence power-frequency voltage is pushed away with other both ends
It calculates gained zero sequence power frequency electric and is pressed with relatively large deviation, the both ends without failure calculate that gained zero sequence power-frequency voltage is very close, such as
This may recognize that failure generation, and when calculating T contact zero sequence power-frequency voltage, there are the branches where one end of deviation.Fig. 3~8
Respectively illustrate zero sequence power-frequency voltage, the current waveform figure at the end M, N-terminal, the end O.From Fig. 3,5,7 and Fig. 4,6,8 comparison of wave shape
As can be seen that all there are larger differences with two other branch for the zero sequence power-frequency voltage at the end M, current waveform, it is possible to determine that failure
Region is between the end M and T contact, to judge that the branch to break down is branch where the end M.
(2) leg endpoint voltage is usedIn addition the branch impedance voltage calculates T contact zero sequence power-frequency voltageTool
Body, T contact is calculated according to the line characteristic of branch where each branch voltage of T link, current parameters and each end measured
Zero sequence power-frequency voltage relative to each end
Wherein,For fromHold the line length of T contact, ZcFor surge impedance of a line, γ is line Phases coefficient.
It could be used without the N-terminal to break down, the zero sequence power-frequency voltage U that the end O is extrapolatedNTAnd UOTBe added and seeks putting down
Mean value is as the T contact zero sequence power-frequency voltage U currently surveyedT:
(3) because T contact be the end M, N-terminal, three branches where the end O aggregation node, branch where passing through N-terminal, the end O
Electric current can calculate the electric current I of branch where obtaining the T contact failure side end MT:
(4) point of the branch road where the end M x is defined to the distance value at the end M, passes through the end M zero sequence power-frequency voltage UMAnd zero sequence
Power current IMIt is calculated from the end M to the voltage's distribiuting U along the line between T contactMT0:
UMT0(x)=UMcosh(γx)+ZcIMsinh(γx)；
Oppositely, pass through T contact zero sequence power current ITWith zero sequence power-frequency voltage UTTo calculate from T contact between the end M
Voltage's distribiuting U along the lineTM0:
UTM0(x)=UTcosh(γ(lM-x))+ZcITsinh(γ(lM-x))。
If there is no failure, U for the branch of T linkMT0It should be with UTM0It is overlapped.And branch road is when breaking down, from T
Contact or endpoint set out, and the power-frequency voltage being calculated can all shift at actual fault point, this to be calculated by T contact
Power-frequency voltage has unique intersection point in fault point with power-frequency voltage along fault branch end calculating gained along gained, it may be assumed that works as UMT0
(x0)=UTM0(x0) when, that is, it can determine that x0For the distance value at the end actual fault point F distance M.As shown in Fig. 2, from power frequency electric is passed through
It presses and is seen on the voltage distribution curves along the line being calculated, the electricity along the line of the end the M place branch to break down is calculated from T contact
Press distribution curve UTM, and with the end of branch where the end M be calculated along voltage distribution curves UMTCompared
Compared with the intersection point of this two curves is the position actual fault point F.X is actually calculated0=80, i.e., fault point F is away from T contact
50km。
The T-link fault distance measurement based on distribution curve along power-frequency voltage first determines whether currently to break down
Fault point T link which branch, confirm fault point F after branch where the end M, by the N-terminal that does not break down,
The zero sequence power-frequency voltage of two branch ends where the end OWith zero sequence power currentTo calculate T contact
Zero sequence power-frequency voltage UTAnd T contact is in the electric current I of the end side MT, last to be calculated according to the end the M voltage being calculated, current parameters
Voltage distribution curves along from guilty culprit one end, and could be used without the T that two end datas of failure are calculated and connect
Point voltage, current parameters are calculated from voltage distribution curves along the guilty culprit route of T contact, and the two is calculated gained
Along the coaxial superimposed processing of voltage distribution curves, the intersection point of two curves is actual fault point position.By repeatedly surveying
After verifying, it was demonstrated that this method accuracy with higher.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than the present invention is protected
The limitation of range is protected, although explaining in detail referring to preferred embodiment to the present invention, those skilled in the art are answered
Work as understanding, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the reality of technical solution of the present invention
Matter and range.
Claims (10)
1. the T-link fault distance measurement based on distribution curve along power-frequency voltage, which comprises the steps of:
Voltage's distribiuting obtaining step along the line calculates separately along the line voltage's distribiuting of the fault branch from T contact to branch endAnd the voltage's distribiuting along the line from branch end to T contact
The position of trouble spot judging step, the point of failure definition branch road is x, and x makes if it existsWithValue it is equal, then
Think that position x is the fault point F on fault branch.
2. the T-link fault distance measurement as described in claim 1 based on distribution curve along power-frequency voltage, feature exist
In the voltage's distribiuting including along of voltage's distribiuting obtaining step along the lineObtaining step:
Wherein, UT、ITRespectively failure side power-frequency voltage and power current of the T contact relative to fault branch,For fromHold T
The line length of contact, ZcFor surge impedance of a line, γ is line Phases coefficient.
3. the T-link fault distance measurement as claimed in claim 2 based on distribution curve along power-frequency voltage, feature exist
In T contact is respectively relative to the average value of the power-frequency voltage of two fault-free branches as the failure side power-frequency voltage UT
Value.
4. the T-link fault distance measurement as claimed in claim 2 based on distribution curve along power-frequency voltage, feature exist
According to the end power current of two fault-free branchesAnd power-frequency voltageCalculate failure side work
Frequency electric current IT:
5. the T-link fault distance measurement as described in claim 1 based on distribution curve along power-frequency voltage, feature exist
In the voltage's distribiuting including along of voltage's distribiuting obtaining step along the lineObtaining step:
Wherein,WithRespectively power-frequency voltage and power current of the fault branch end relative to T contact,For fromIt holds
The line length of T contact, ZcFor surge impedance of a line, γ is line Phases coefficient.
6. the T-link fault distance measurement as described in claim 1 based on distribution curve along power-frequency voltage, feature exist
In including the fault branch judgment step executed before the voltage's distribiuting obtaining step along the line:
End power-frequency voltage/power current of T link all branches is obtained, if it exists power-frequency voltage/power current of branch
It is different from power-frequency voltage/power current of other all branches, then judges the branch for fault branch.
7. the T-link fault distance measurement as claimed in claim 6 based on distribution curve along power-frequency voltage, feature exist
In, in the fault branch judgment step, the work of power-frequency voltage/power current of branch and two or more branch if it exists
Frequency voltage/power current difference exceeds preset threshold, then judges the branch for fault branch.
8. the T-link fault distance measurement as described in claim 1 based on distribution curve along power-frequency voltage, feature exist
In in the trouble spot judging step, respectively according to voltage's distribiuting along the lineWithDrawing with x is the same of a wherein axis
Voltage distribution curves judge the corresponding x position of the intersection point for failure if two curve existence anduniquess intersection points along reference axis
Point F.
9. the T link fault localization side based on distribution curve along power-frequency voltage as described in any one of claim 2~8
Method, which is characterized in that the power-frequency voltage is zero sequence power-frequency voltage, and the power current is zero sequence power current.
10. computer readable storage medium is stored with computer program, characterized in that the computer program is by controller
It can be realized method according to any one of claims 1 to 9 when execution.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111413591A (en) * | 2020-04-29 | 2020-07-14 | 华中科技大学 | Fault positioning method and device based on voltage fault component distribution characteristics |
| CN111426913A (en) * | 2020-04-17 | 2020-07-17 | 南方电网科学研究院有限责任公司 | Fault positioning method and system based on positive sequence voltage distribution characteristics |
| CN111736039A (en) * | 2020-08-21 | 2020-10-02 | 武汉品迅科技有限公司 | Distribution line fault positioning method and system |
| CN113687129A (en) * | 2021-09-10 | 2021-11-23 | 广东电网有限责任公司 | Real-time short-circuit current calculation method and device for switching line |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107202936A (en) * | 2017-05-04 | 2017-09-26 | 许继集团有限公司 | A kind of T-link fault distance measurement |
-
2019
- 2019-05-30 CN CN201910464050.8A patent/CN110082646A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107202936A (en) * | 2017-05-04 | 2017-09-26 | 许继集团有限公司 | A kind of T-link fault distance measurement |
Non-Patent Citations (3)
| Title |
|---|
| 杨军等: "一种高压电缆- 架空线混合线路智能重合闸方案", 《电力自动化设备》 * |
| 王守鹏等: "基于线路分段参数的非全程同塔双回线故障定位算法", 《电工技术学报》 * |
| 王志梅等: "T型接线的一种新型精确故障定位算法的研究", 《电力情报》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111426913A (en) * | 2020-04-17 | 2020-07-17 | 南方电网科学研究院有限责任公司 | Fault positioning method and system based on positive sequence voltage distribution characteristics |
| CN111426913B (en) * | 2020-04-17 | 2021-07-27 | 南方电网科学研究院有限责任公司 | Fault positioning method and system based on positive sequence voltage distribution characteristics |
| CN111413591A (en) * | 2020-04-29 | 2020-07-14 | 华中科技大学 | Fault positioning method and device based on voltage fault component distribution characteristics |
| CN111413591B (en) * | 2020-04-29 | 2021-10-08 | 华中科技大学 | Fault positioning method and device based on voltage fault component distribution characteristics |
| CN111736039A (en) * | 2020-08-21 | 2020-10-02 | 武汉品迅科技有限公司 | Distribution line fault positioning method and system |
| CN111736039B (en) * | 2020-08-21 | 2020-11-13 | 武汉品迅科技有限公司 | Distribution line fault positioning method and system |
| CN113687129A (en) * | 2021-09-10 | 2021-11-23 | 广东电网有限责任公司 | Real-time short-circuit current calculation method and device for switching line |
| CN113687129B (en) * | 2021-09-10 | 2023-12-29 | 广东电网有限责任公司 | Real-time short-circuit current calculation method and device for switching line |
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