CN110082647A - Circuit fault distance measurement and computer readable storage medium based on phase angle curve along power-frequency voltage - Google Patents
Circuit fault distance measurement and computer readable storage medium based on phase angle curve along power-frequency voltage Download PDFInfo
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- CN110082647A CN110082647A CN201910464422.7A CN201910464422A CN110082647A CN 110082647 A CN110082647 A CN 110082647A CN 201910464422 A CN201910464422 A CN 201910464422A CN 110082647 A CN110082647 A CN 110082647A
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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
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Abstract
The present invention provides a kind of circuit fault distance measurement based on phase angle curve along power-frequency voltage, this method measures the power frequency residual voltage U at the both ends faulty line M, N respectively firstM、UNWith power frequency zero-sequence current IM、IN, the voltage's distribiuting U along the line from both ends to the other end respectively is then calculated by telegraph equationMd(x) and UNdThen the respective plural phase angle theta of extractor (x),M(xf) and θN(yf) and it is converted into curve respectively, finally by the resulting coaxial superimposed processing of voltage phase angle distribution curve along the line of the two, the intersection point of two curves is actual fault point position.This method only needs residual voltage and electric current, calculates simply, without detecting to wavefront, the initial phase angle of failure does not influence this method accuracy；Required sample frequency is lower, it is only necessary to 1.2kHz.And after repeatedly surveying verifying, it was demonstrated that this method accuracy with higher.
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 circuit fault distance measurement of line phase angle curve.
Background technique
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.Accurate fault location can not only mitigate line walking burden, can also accelerate the recovery of faulty line
Power supply mitigates because of economic loss caused by having a power failure.Currently, the difference of the signal frequency usually used according to Fault Location Algorithm
Fault positioning method for transmission line is divided into two class of impedance method and traveling wave method.Impedance method is direct using the power frequency component after failure
Calculate fault impedance or the method for its percentage；Traveling wave rule is to utilize high frequency fault transient current, voltage traveling wave signal or event
With pulse frequency modulated radar system etc. come the method for indirect judgement position of failure point after barrier.Impedance method is depended on to route
Impedance is calculated, and is easy to be influenced by fault type, transition resistance and system impedance, distance measurement result is not ideal enough, and goes
Wave method needs higher sample rate to capture wavefront, will receive the influence of the initial phase angle of failure, and wavefront is slightly
It is vertical to die, once failing accurately to capture, will be unable to carry out ranging.
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
Phase angle curve is accurately positioned the circuit 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, this to pass through route when calculating the power-frequency voltage phase angle of route
The electric parameter that end obtains is only capable of being calculated fault point and its accurate power-frequency voltage phase angle before, and calculates resulting
Power-frequency voltage phase angle after fault point is shunted by fault point to be influenced, and is differed greatly with practical power-frequency voltage phase angle.And it sends out
Bright people discovery, by the way that route both ends are calculated power-frequency voltage phase angle respectively as end, the two existence anduniquess intersection point, and the friendship
Point is position of failure point.After verifying, it was demonstrated that this method accuracy with higher.
The purpose of the present invention is achieved through the following technical solutions:
Circuit fault distance measurement based on phase angle curve along power-frequency voltage is provided, is included the following steps:
Line voltage phase angle distributed acquisition step calculates separately along the line voltage phase angle distribution θ of the route from M end to N-terminalM, with
And the voltage phase angle along the line from N-terminal to the end M is distributed θN；
The position of trouble spot judging step, the point of failure definition branch road is x, and x makes θ if it existsMAnd θNValue it is equal,
Then think that position x is the fault point F on fault branch.
Preferably, the voltage's distribiuting obtaining step along the line includes the θ of voltage phase angle distribution along the lineMAnd θNObtaining step:
θM(x)=angle (UMd(x))；
θN(y)=angle (UNd(y))；
Wherein, UMd(x) and UNdIt (x) is respectively from the end M to the voltage's distribiuting along the line between N-terminal and from N-terminal between the end M
Along voltage's distribiuting.
Preferably, the power frequency residual voltage U at the end M is obtainedMWith power frequency zero-sequence current IM, the power frequency residual voltage U of N-terminalNAnd work
Frequency zero-sequence current IN, the U is calculated according to telegraph equationMd(x) and UNd(x):
UMd(x)=UMcosh(γx)+IMsinh(γx)/Zc；
UNd(x)=UNcosh(γx)+INsinh(γx)/Zc；
Wherein, x is distance value of the point on route to the end M, and y is distance value of the point to N-terminal on route, ZcFor route wave
Impedance, γ are line Phases coefficient.
Preferably, in the trouble spot judging step, voltage phase angle is distributed θ along respectivelyMAnd θNIt 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, wherein x, y ∈ [0, l], l are total line length, x=l-y.
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 circuit fault distance measurement based on phase angle 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 circuit fault distance measurement based on phase angle curve along power-frequency voltage, is divided first
The power frequency residual voltage U at the both ends faulty line M, N is not measuredM、UNWith power frequency zero-sequence current IM、IN, then pass through telegraph equation meter
It calculates and obtains the voltage's distribiuting U along the line from both ends to the other end respectivelyMd(x) and UNdThen the respective plural phase of extractor (x),
Angle θM(xf) and θN(yf) and it is converted into curve respectively, it is finally that the resulting voltage phase angle distribution curve along the line of the two is coaxial
Stacked processing, the intersection point of two curves is actual fault point position.Route event based on phase angle curve along power-frequency voltage
Hinder distance measuring method and calculates phase angle along zero sequence power-frequency voltage using the surveyed zero sequence power-frequency voltage of line end and zero sequence power current
Curve, without calculating line impedance, while without capturing to wavefront, required sample rate is low, calculates simple.
And after repeatedly surveying verifying, it was demonstrated that this method accuracy with higher.
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 conspectus based on the circuit fault distance measurement of phase angle curve along power-frequency voltage.
Fig. 2 is that two voltage phase angles based on the circuit fault distance measurement of phase angle curve along power-frequency voltage are distributed song
The coaxial superimposed schematic diagram of line.
Specific embodiment
The invention will be further described with the following Examples.
As shown in Figure 1, overall length 130km between the end route M and N-terminal, occurs ground fault at the F of fault point.Electric system
Line failure is recognized, the respective residual voltage in route both ends after failure occurs and zero-sequence current data is extracted, passes through
The circuit fault distance measurement based on phase angle curve along power-frequency voltage obtains the accurate location of fault point F.
When line failure, the end line power transmitting terminal M can measure to obtain power frequency residual voltage UMWith power frequency zero
Sequence electric current IM, line power receiving terminal N-terminal can measure to obtain power frequency residual voltage UNWith power frequency zero-sequence current IN.In addition, obtaining
The intrinsic parameter of route: line Phases coefficient gamma and surge impedance of a line Zc。
(1) it defines the distance value that x is point to the end M on route and the end M zero sequence power-frequency voltage U is passed through according to telegraph equationM
With zero sequence power current IMIt is calculated from the end M to the voltage's distribiuting U along the line between N-terminalMd(x):
UMd(x)=UMcosh(γx)+IMsinh(γx)/Zc；
(2) oppositely, it defines the distance value that y is point to the N-terminal on route and N-terminal zero sequence power frequency is passed through according to telegraph equation
Voltage UNWith zero sequence power current INIt is calculated from N-terminal to the voltage's distribiuting U along the line between the end MNd(x):
UNd(x)=UNcosh(γx)+INsinh(γx)/Zc；
(3) voltage's distribiuting U along extracting respectivelyMd(x) and UNd(x) plural phase angle:
θM(x)=angle (UMd(x))；
θN(y)=angle (UNd(y))；
(4) if there is no failure, θ for routeM(xf) should be with θN(yf) be overlapped, and when breaking down on route, from the end M
Or N-terminal sets out, the power-frequency voltage being calculated can all shift at actual fault point, and plural phase angle deviates therewith, this
So that being had uniquely by power-frequency voltage phase angle along power-frequency voltage phase angle along the end M calculating gained and N-terminal calculating gained in fault point
Intersection point, it may be assumed that work as θM(xf)=θN(yf) when, that is, it can determine that actual fault point position and the end M distance are xf, it is y with N-terminal distancef.Its
In, xf, yf∈ [0, l], l are total line length, and xf=l-yf。
As shown in Fig. 2, along being obtained by power-frequency voltage phase calculation from voltage phase angle distribution curve, from the end M
It sets out and calculates the voltage phase angle distribution curve θ along the line of routeM, and with the route that is calculated from N-terminal along line voltage phase
Angle distribution curve θNIt is compared, the intersection point of this two curves is the position actual fault point F.X=50 is actually calculated, i.e.,
Fault point F is away from the end M 50km, away from N-terminal 80km.
The circuit fault distance measurement based on phase angle curve along power-frequency voltage, measures faulty line M, N respectively first
The power frequency residual voltage U at both endsM、UNWith power frequency zero-sequence current IM、IN, then it is calculated respectively by telegraph equation from both ends
It sets out to voltage's distribiuting U along the other endMd(x) and UNdThen the respective plural phase angle theta of extractor (x),M(xf) and θN(yf) simultaneously
It is converted into curve respectively, finally by the resulting coaxial superimposed processing of voltage phase angle distribution curve along the line of the two, two curves
Intersection point be actual fault point position.This method only needs residual voltage and electric current, calculates simply, without carrying out to wavefront
Detection, the initial phase angle of failure do not influence this method accuracy；Required sample frequency is lower, it is only necessary to 1.2kHz.And by repeatedly real
After test card, 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 (6)
1. the circuit fault distance measurement based on phase angle curve along power-frequency voltage, which comprises the steps of:
Voltage phase angle distributed acquisition step along the line calculates separately along the line voltage phase angle distribution θ of the route from M end to N-terminalM, Yi Jicong
N-terminal sets out to voltage phase angle distribution θ along the end MN；
The position of trouble spot judging step, the point of failure definition branch road is x, and x makes θ if it existsMAnd θNValue it is equal, then recognize
For the fault point F that position x is on fault branch.
2. the circuit fault distance measurement as described in claim 1 based on phase angle curve along power-frequency voltage, which is characterized in that
Voltage's distribiuting obtaining step includes the θ of voltage phase angle distribution along the line along describedMAnd θNObtaining step:
θM(x)=angle (UMd(x))；
θN(y)=angle (UNd(y))；
Wherein, UMd(x) and UNd(x) respectively from the end M to the voltage's distribiuting along the line between N-terminal and from N-terminal to along between the end M
Voltage's distribiuting.
3. the circuit fault distance measurement as claimed in claim 2 based on phase angle curve along power-frequency voltage, which is characterized in that
Obtain the power frequency residual voltage U at the end MMWith power frequency zero-sequence current IM, the power frequency residual voltage U of N-terminalNWith power frequency zero-sequence current IN, root
The U is calculated according to telegraph equationMd(x) and UNd(x):
UMd(x)=UMcosh(γx)+IMsinh(γx)/Zc；
UNd(x)=UNcosh(γx)+INsinh(γx)/Zc；
Wherein, x is distance value of the point on route to the end M, and y is distance value of the point to N-terminal on route, ZcFor surge impedance of a line,
γ is line Phases coefficient.
4. the circuit fault distance measurement as described in claim 1 based on phase angle curve along power-frequency voltage, which is characterized in that
In the trouble spot judging step, voltage phase angle is distributed θ along respectivelyMAnd θNDraw the same coordinate with x for a wherein axis
Axis along voltage distribution curves, if two curve existence anduniquess intersection points, judge the corresponding x position of the intersection point for fault point F,
Wherein, x, y ∈ [0, l], l are total line length, x=l-y.
5. the circuit fault distance measurement based on phase angle curve along power-frequency voltage as described in any one of claim 2~4,
It is characterized in that, the power-frequency voltage is zero sequence power-frequency voltage, the power current is zero sequence power current.
6. computer readable storage medium is stored with computer program, characterized in that the computer program is held by controller
It can be realized method according to any one of claims 1 to 5 when row.
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Cited By (1)
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| CN112578225A (en) * | 2020-12-07 | 2021-03-30 | 广东电网有限责任公司韶关供电局 | Method, device and system for determining single-phase earth fault point |
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Address after: Room 509, building D, 39 Ruihe Road, Huangpu District, Guangzhou City, Guangdong Province Applicant after: Guangzhou Shuimu Qinghua Technology Co.,Ltd. Address before: Room 936, Room 333 Jiufojian Road, Zhongxin Guangzhou Knowledge City, Guangzhou, Guangdong Province Applicant before: Guangzhou Shuimu Qinghua Technology Co.,Ltd. |
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Application publication date: 20190802 |