CN110470950A - Fault positioning method for transmission line - Google Patents
Fault positioning method for transmission line Download PDFInfo
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- CN110470950A CN110470950A CN201910759453.5A CN201910759453A CN110470950A CN 110470950 A CN110470950 A CN 110470950A CN 201910759453 A CN201910759453 A CN 201910759453A CN 110470950 A CN110470950 A CN 110470950A
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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
- G01R31/088—Aspects of digital computing
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Abstract
This application provides a kind of fault positioning method for transmission line; it include: the first side three-phase voltage and the first side three-phase current of the transmission line of electricity to be obtained by the first protective device of transmission line of electricity first end, and the first zero-sequence current is determined based on the first side three-phase current.Second side three-phase voltage and second side three-phase current of transmission line of electricity are obtained by the second protective device of transmission line of electricity second end, and the second zero-sequence current is determined based on second side three-phase current.The first side three-phase voltage, the first side three-phase current and the first zero-sequence current are obtained by the second protective device, and determines the first distance of transmission line of electricity second end to fault point based on second side three-phase voltage, second side three-phase current and the second zero-sequence current.First distance is compared with the total length of transmission line of electricity, if first distance is less than the total length of transmission line of electricity, it is determined that first distance is Fisrt fault distance of the transmission line of electricity second end to fault point.
Description
Technical field
This application involves technical field of power systems, more particularly to fault positioning method for transmission line.
Background technique
With the continuous development of electric system, super-pressure, long distance transmission line are more and more.Ultra-high-tension power transmission line is electricity
The lifeblood of Force system, it is responsible for the important task of transmission electric energy.Meanwhile it is most place of breaking down in electric system again.
Ultra-high-tension power transmission line failure constitutes larger threat to the safe operation of entire electric system, at present the fault point of ultra-high-tension power transmission line
Fault location device is mostly used to carry out fault detection greatly.
Fault location device is also known as fault locator, is a kind of automatic device for measuring position of failure point.It can root
Fault point is quickly and accurately measured according to different fault signatures, this not only significantly reduces the hardships labour of artificial line walking, but also
The indiscoverable failure of people can also be found.
The method of existing fault localization can be divided into unit faults recorder analysis method, impedance method, travelling wave analysis method by range measurement principle.And
The information source according to needed for ranging can be divided into single end distance measurement method and both ends telemetry again.Traveling wave method used at present is that both-end is surveyed
It away from method, but needs to install special traveling wave ranging device and GPS or Beidou time synchronization system and carries out ranging, installation cost and be mounted to
This height.
Summary of the invention
Based on this, it is necessary to need to install special traveling wave ranging device and GPS or north for existing both ends fault localization
The time synchronization system that struggles against carries out ranging, installation cost and the high problem of installation cost, provides a kind of fault positioning method for transmission line.
A kind of fault positioning method for transmission line, the method are wrapped for detecting whether the transmission line of electricity occurs short circuit
It includes:
The first side three-phase voltage of the transmission line of electricity is obtained by the first protective device of the transmission line of electricity first end
With the first side three-phase current, and the first zero-sequence current, first side three-phase voltage are determined based on first side three-phase current
Including first the first phase voltage of side, first the second phase voltage of side and the first side third phase voltage, the first side three-phase current packet
Include first the first phase current of side, first the second phase current of side and the first side third phase current；
Second side three-phase voltage of the transmission line of electricity is obtained by the second protective device of the transmission line of electricity second end
With second side three-phase current, and the second zero-sequence current, second side three-phase voltage are determined based on second side three-phase current
Including the first phase voltage of second side, the second phase voltage of second side and second side third phase voltage, second side three-phase current packet
Include the first phase current of second side, the second phase current of second side and second side third phase current, second protective device with it is described
The communication connection of first protective device；
First side three-phase voltage, first side three-phase current and described the are obtained by second protective device
One zero-sequence current, and determined based on second side three-phase voltage, second side three-phase current and second zero-sequence current
For the transmission line of electricity second end to the first distance of the fault point, the first distance includes first phase of transmission line of electricity
The distance of two ends to the fault point, the distance of the transmission line of electricity the second phase second end to the fault point, the power transmission line
Road third phase second end to the fault point distance；
The first distance is compared with the total length of the transmission line of electricity, if the first distance is less than described defeated
The total length of electric line, it is determined that the first distance be the transmission line of electricity second end to the fault point Fisrt fault away from
From.
First side three-phase voltage, described the are obtained by second protective device in one of the embodiments,
Side three-phase current and first zero-sequence current, and based on second side three-phase voltage, second side three-phase current and
Second zero-sequence current determines that the step of first distance of the transmission line of electricity second end to fault point includes:
First side three-phase voltage, first side three-phase current and described the are obtained by second protective device
One zero-sequence current, and determined based on second side three-phase voltage, second side three-phase current and second zero-sequence current
The transmission line of electricity second end to the fault point the first impedance；
Determine the transmission line of electricity second end to the fault point according to first impedance and based on default impedance factor
First distance.
It is described in one of the embodiments, that first side three-phase voltage, institute are obtained by second protective device
The first side three-phase current and first zero-sequence current are stated, and is based on second side three-phase voltage, second side three-phase electricity
Flowing the step of determining the first impedance of the transmission line of electricity second end to the fault point with second zero-sequence current includes:
First side three-phase voltage, first side three-phase current and described the are obtained by second protective device
One zero-sequence current；
First side three-phase voltage, first side three-phase current, described the are based on by second protective device
One zero-sequence current, second side three-phase voltage, second side three-phase current and second zero-sequence current calculate described defeated
Electric line second end to the fault point the first impedance, specific formula is as follows:
Wherein, ZNKFor first impedance,For first side three-phase current,For first side three-phase electricity
Pressure,For first zero-sequence current,For second side three-phase voltage,For second side three-phase current,
For second zero-sequence current, K is zero-utility theory, ZLFor the transmission line of electricity total impedance.
It is described in one of the embodiments, to determine the transmission of electricity according to first impedance and based on default impedance factor
Route second end to the fault point first distance the step of include:
Obtain the default impedance factor；
The transmission line of electricity second end is calculated to the fault point according to first impedance and the default impedance factor
First distance, specific formula is as follows:
Wherein, LNFor the first distance, Z is the default impedance factor.
First side three-phase voltage, described the are obtained by second protective device in one of the embodiments,
Side three-phase current and first zero-sequence current, and based on second side three-phase voltage, second side three-phase current and
Before second zero-sequence current determines the step of first distance of the transmission line of electricity second end to the fault point, the side
Method further include:
Second side three-phase voltage, second side three-phase current and described the are obtained by first protective device
Two zero-sequence currents, and determined based on first side three-phase voltage, first side three-phase current and first zero-sequence current
For the transmission line of electricity first end to the second distance of the fault point, the second distance includes first phase of transmission line of electricity
The distance of one end to the fault point, the distance of the transmission line of electricity the second phase first end to the fault point, the power transmission line
Road third phase first end to the fault point distance；
The second distance is compared with the total length of the transmission line of electricity, if the second distance is less than described defeated
The total length of electric line, it is determined that the second distance be the transmission line of electricity first end to the fault point the second failure away from
From.
Second side three-phase voltage, described the are obtained by first protective device in one of the embodiments,
Two side three-phase currents and second zero-sequence current, and based on first side three-phase voltage, first side three-phase current and
First zero-sequence current determines that the step of second distance of the transmission line of electricity first end to the fault point includes:
Second side three-phase voltage, second side three-phase current and described the are obtained by first protective device
Two zero-sequence currents, and determined based on first side three-phase voltage, first side three-phase current and first zero-sequence current
The transmission line of electricity second end to the fault point the second impedance；
Determine the transmission line of electricity first end to the fault point according to second impedance and based on default impedance factor
The second distance.
Second side three-phase voltage, described the are obtained by first protective device in one of the embodiments,
Two side three-phase currents and second zero-sequence current, and based on first side three-phase voltage, first side three-phase current and
First zero-sequence current determines that the step of the second impedance of the transmission line of electricity first end to the fault point includes:
Second side three-phase voltage, second side three-phase current and described the are obtained by first protective device
Two zero-sequence currents；
First side three-phase voltage, first side three-phase current, described the are based on by first protective device
One zero-sequence current, second side three-phase voltage, second side three-phase current and second zero-sequence current calculate described defeated
Electric line first end to the fault point the second impedance, specific formula is as follows:
Wherein, ZMKFor second impedance,For first side three-phase current,For first side three-phase electricity
Pressure,For first zero-sequence current,For second side three-phase voltage,For second side three-phase current,
For second zero-sequence current, K is zero-utility theory, ZLFor the transmission line of electricity total impedance.
The transmission line of electricity is determined according to second impedance and based on default impedance factor in one of the embodiments,
First end to the fault point the second distance the step of include:
Obtain the default impedance factor；
The transmission line of electricity first end is calculated to the fault point according to second impedance and the default impedance factor
Second distance, specific formula is as follows:
Wherein, LMFor the second distance, Z is the default impedance factor.
First protective device and second protective device are connected by fiber optic communication in one of the embodiments,
It connects.
First protective device includes: in one of the embodiments,
First detection module, for detect first side of fault point first side three-phase voltage and first side
Three-phase current；
First processing module is electrically connected with the first detection module, is communicated to connect, is used for second protective device
First zero-sequence current is determined based on first side three-phase current, and according to first side three-phase voltage, described first
Side three-phase current, first zero-sequence current, second side three-phase voltage, second side three-phase current and the described 2nd 0
Sequence electric current calculates the second distance of the transmission line of electricity first end to the fault point.
Second protective device includes: in one of the embodiments,
Second detection module, for detect described fault point second side second side three-phase voltage and described second side
Three-phase current；
Second processing module is electrically connected with second detection module, is communicated to connect, is used for first protective device
Second zero-sequence current is determined based on second side three-phase current, and according to first side three-phase voltage, described first
Side three-phase current, first zero-sequence current, second side three-phase voltage, second side three-phase current and the described 2nd 0
Sequence electric current calculates the first distance of the transmission line of electricity second end to the fault point.
Compared with prior art, above-mentioned fault positioning method for transmission line passes through the transmission line of electricity first end first
First protective device obtains the first side three-phase voltage and the first side three-phase current of the transmission line of electricity, according to the first side three-phase electricity
Stream determines first zero-sequence current.Then the power transmission line is obtained by the second protective device of the transmission line of electricity second end
Second side three-phase voltage and second side three-phase current on road determine second zero-sequence current according to second side three-phase current.So
First side three-phase voltage, first side three-phase current and first zero sequence are obtained by second protective device afterwards
Electric current, and determined based on second side three-phase voltage, second side three-phase current and second zero-sequence current described defeated
Electric line second end to the fault point first distance.If the first distance is less than the total length of the transmission line of electricity,
Determine that the first distance is Fisrt fault distance of the transmission line of electricity second end to the fault point.
The application uses aforesaid way, when transmission line of electricity breaks down, the three-phase current of fault inspecting two sides and three
Phase voltage, and cooperated by first protective device and second protective device, that is, it can measure the position of fault point, realize
The accurate positionin of fault point.Ranging is carried out so as to avoid the special traveling wave ranging device of installation and GPS or Beidou time synchronization system,
And then under the premise of realizing the accurate positionin of fault point, installation cost and installation cost are greatly reduced.
Detailed description of the invention
Fig. 1 is the flow chart for the fault positioning method for transmission line that one embodiment of the application provides；
Fig. 2 is the fault localization schematic illustration for the transmission line of electricity that one embodiment of the application provides.
100 first protective devices
110 first detection modules
120 first processing modules
200 second protective devices
210 second detection modules
220 Second processing modules
300 optical fiber
Specific embodiment
In order to make the above objects, features, and advantages of the present application more apparent, with reference to the accompanying drawing to the application
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this Shen
Please.But the application can be implemented with being much different from other way described herein, those skilled in the art can be not
Similar improvement is done in the case where violating the application intension, therefore the application is not limited by following public specific implementation.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
Referring to Figure 1 and Fig. 2, one embodiment of the application provide a kind of fault positioning method for transmission line, and the method is used
Whether short circuit occurs in the detection transmission line of electricity, comprising:
S102: the first side of the transmission line of electricity is obtained by the first protective device 100 of the transmission line of electricity first end
Three-phase voltage and the first side three-phase current, and the first zero-sequence current, first side are determined based on first side three-phase current
Three-phase voltage includes first the first phase voltage of side, first the second phase voltage of side and the first side third phase voltage, first side three
Phase current includes first the first phase current of side, first the second phase current of side and the first side third phase current.
In one embodiment, the specific structure of first protective device 100 with no restrictions, as long as have obtain described in
First side three-phase voltage and first side three-phase current of transmission line of electricity, and determined based on first side three-phase current
The function of first zero-sequence current.In one embodiment, first protective device 100 can be by measure voltage & current
Sensor and processor are constituted.In one embodiment, first protective device 100 can also by measure voltage & current device and
MCU (microprocessing unit) is constituted.
In one embodiment, the every transmission line of electricity includes both ends, i.e. first end and second end.Can every institute
The both ends for stating transmission line of electricity are respectively arranged a protective device (i.e. first end are correspondingly arranged first protective device 100, second end
The second protective device 200 can be correspondingly arranged).In one embodiment, the event can be obtained by first protective device 100
First side three-phase voltage and first side three-phase current of the first side of barrier point.
In one embodiment, first side three-phase voltage may include first phase voltage of the first side, described first
The second phase voltage of side and the first side third phase voltage.First side three-phase current may include the first phase of the first side electricity
Stream, second phase current of the first side and the first side third phase current.The fault point can be on the transmission line of electricity
The first phase and/or the second phase and/or third phase failure.In one embodiment, first protective device 100 can be real
When detect the three-phase voltage (including the first phase voltage, the second phase voltage and third phase voltage) and three of the transmission line of electricity first end
Phase current (including the first phase current, the second phase current and third phase current).
In one embodiment, first protective device 100 can calculate described the according to first side three-phase current
One zero-sequence current.Specifically, can be calculated according to the following formula when phase on the basis of A phase (i.e. the first phase):
Wherein,For first phase current of the first side,For second phase current of the first side,It is described
First side third phase current,For first zero-sequence current.
S104: second side of the transmission line of electricity is obtained by the second protective device 200 of the transmission line of electricity second end
Three-phase voltage and second side three-phase current, and the second zero-sequence current, described second side are determined based on second side three-phase current
Three-phase voltage includes the first phase voltage of second side, the second phase voltage of second side and second side third phase voltage, described second side three
Phase current includes the first phase current of second side, the second phase current of second side and second side third phase current, the second protection dress
200 are set to communicate to connect with first protective device 100.
In one embodiment, the specific structure of second protective device 200 with no restrictions, as long as have obtain described in
Second side three-phase voltage and second side three-phase current of transmission line of electricity, and determined based on second side three-phase current
The function of second zero-sequence current.In one embodiment, second protective device 200 can be by measure voltage & current
Sensor and processor are constituted.In one embodiment, second protective device 200 can also by measure voltage & current device and
MCU (microprocessing unit) is constituted.
In one embodiment, described the of described fault point second side can be obtained by second protective device 200
Two side three-phase voltages and second side three-phase current.In one embodiment, second side three-phase voltage may include described
The first phase voltage of second side, the second phase voltage of described second side and second side third phase voltage.Second side three-phase electricity
Stream may include first phase current of second side, the second phase current of described second side and second side third phase current.One
In a embodiment, second protective device 200 can be with the three-phase voltage and three-phase of transmission line of electricity second end described in real-time detection
Electric current.
In one embodiment, second protective device 200 can calculate described the according to second side three-phase current
Two zero-sequence currents.Specifically, can be calculated according to the following formula when phase on the basis of A phase (i.e. the first phase):
Wherein,For first phase current of second side,For second phase current of second side,It is described
Second side third phase current,For second zero-sequence current.
In one embodiment, the mode communicated between second protective device 200 and first protective device 100
It is unlimited, it can be selected according to actual needs.In one embodiment, second protective device 200 and first protection
Device 100 can be communicated to connect by optical fiber 300.Second protective device 200 can also pass through with first protective device 100
Other way is communicated, such as WIFI, bluetooth.
S106: first side three-phase voltage, first side three-phase current are obtained by second protective device 200
With first zero-sequence current, and be based on second side three-phase voltage, second side three-phase current and second zero sequence
Electric current determines the first distance of the transmission line of electricity second end to the fault point.The first distance includes the transmission line of electricity
First phase second end is to the distance of the fault point, the distance of the transmission line of electricity the second phase second end to the fault point, institute
State the distance of transmission line of electricity third phase second end to the fault point.
In one embodiment, first protective device 100 can be obtained by second protective device 200 to calculate
First side three-phase voltage, first side three-phase current and first zero-sequence current arrived, and it is based on described second side
Three-phase voltage, second side three-phase current and second zero-sequence current determine the transmission line of electricity second end to the failure
First impedance of point.Specifically, first impedance can be calculated according to the following formula:
Wherein, ZNKFor first impedance,For first side three-phase current,For first side three-phase electricity
Pressure,For first zero-sequence current,For second side three-phase voltage,For second side three-phase current,
For second zero-sequence current, K is zero-utility theory, ZLFor the transmission line of electricity total impedance.
In one embodiment,Can in the three-phase current of first side first phase current of the first side or institute
State first the second phase current of side or the first side third phase current.Likewise,It can be in the three-phase voltage of first side
First side, first phase voltage or second phase voltage of the first side or the first side third phase voltage.Use above-mentioned public affairs
First impedance that formula is calculated can include: impedance of transmission line of electricity the first phase second end to the fault point, institute
State impedance of transmission line of electricity the second phase second end to the fault point, the transmission line of electricity third phase second end to the fault point
One of impedance or a variety of.
Then the transmission line of electricity second end can be further calculated according to first impedance being calculated to the event
Hinder the first distance of point.Specifically, the default impedance factor can be obtained first, then according to first impedance and described default
Impedance factor calculates the first distance of the transmission line of electricity second end to the fault point, specific formula is as follows:
Wherein, LNFor the first distance, Z is the default impedance factor.
Likewise, the first distance being calculated includes: transmission line of electricity the first phase second end to the failure
Distance, the distance of the transmission line of electricity the second phase second end to the fault point, the transmission line of electricity third phase second end of point
One of distance to the fault point is a variety of.
S108: the total length of the first distance and the transmission line of electricity is carried out by second protective device 200
Compare, if the first distance is less than the total length of the transmission line of electricity, it is determined that the first distance is the transmission line of electricity
Second end to the fault point Fisrt fault distance.
In one embodiment, the first distance is compared with the total length of the transmission line of electricity and is referred to: by institute
State distance, the transmission line of electricity second phase second end to the fault point of transmission line of electricity the first phase second end to the fault point
Distance, the distance of the transmission line of electricity third phase second end to the fault point respectively with the total length of the transmission line of electricity into
Row compares, and judges which phase second end to the distance of the fault point is less than the power transmission line in transmission line of electricity three-phase described above
The total length on road, to can determine that current corresponding distance is the Fisrt fault distance.
Such as: if the transmission line of electricity the first phase second end is to the distance of the fault point and/or the transmission line of electricity
Two-phase second end is small to the distance of the fault point and/or the distance of transmission line of electricity third phase second end to the fault point
In the total length of the transmission line of electricity, then the distance is the Fisrt fault distance.
In one embodiment, if the first distance is equal to the total length of the transmission line of electricity, it is determined that the distance is simultaneously
It is not the transmission line of electricity second end to the distance of fault point, return step S106 at this time.
As a result, using aforesaid way can calculate the transmission line of electricity second end to the fault point described first away from
From being how many, so that the accurate positionin of fault point can be realized.And then under the premise of realizing the accurate positionin of fault point, drop significantly
Low installation cost and installation cost.
In one embodiment, before step S106, the method also includes: pass through first protective device 100
Second side three-phase voltage, second side three-phase current and second zero-sequence current are obtained, and is based on first side
Three-phase voltage, first side three-phase current and first zero-sequence current determine the transmission line of electricity first end to the failure
The second distance of point.The second distance includes transmission line of electricity the first phase first end to the distance, described of the fault point
Distance, the transmission line of electricity third phase first end to the fault point of transmission line of electricity the second phase first end to the fault point
Distance.
The second distance is compared with the total length of the transmission line of electricity by first protective device 100,
If the second distance is less than the total length of the transmission line of electricity, it is determined that the second distance is the transmission line of electricity first end
To the second fault distance of the fault point.
In one embodiment, first protective device 100 can be first passed through and obtain second side three-phase voltage, described
Second side three-phase current and second zero-sequence current, and it is based on first side three-phase voltage, first side three-phase current
The second impedance of the transmission line of electricity second end to the fault point is determined with first zero-sequence current.Specific formula is as follows:
Wherein, ZMKFor second impedance,For first side three-phase current,For first side three-phase electricity
Pressure,For first zero-sequence current,For second side three-phase voltage,For second side three-phase current,
For second zero-sequence current, K is zero-utility theory, ZLFor the transmission line of electricity total impedance.
In one embodiment, second impedance being calculated using above-mentioned formula can include: the transmission line of electricity
First phase first end is to the impedance of the fault point, the impedance of the transmission line of electricity the second phase first end to the fault point, institute
Transmission line of electricity third phase first end is stated to one of the impedance of the fault point or a variety of.
Then the transmission line of electricity first end can be further calculated according to second impedance being calculated to the event
Hinder the second distance of point.Specifically, the default impedance factor can be obtained first, then according to second impedance and described default
Impedance factor calculates the second distance of the transmission line of electricity first end to the fault point, specific formula is as follows:
Wherein, LMFor the second distance, Z is the default impedance factor.
Likewise, the second distance being calculated can include: transmission line of electricity the first phase first end to the event
Hinder distance, the distance of the transmission line of electricity the second phase first end to the fault point, the transmission line of electricity third phase first of point
End is to one of the distance of the fault point or a variety of.
In one embodiment, the second distance is compared with the total length of the transmission line of electricity and is referred to: by institute
State distance, the transmission line of electricity second phase first end to the fault point of transmission line of electricity the first phase first end to the fault point
Distance, the distance of the transmission line of electricity third phase first end to the fault point respectively with the total length of the transmission line of electricity into
Row compares, and judges which phase first end to the distance of the fault point is less than the power transmission line in transmission line of electricity three-phase described above
The total length on road, to can determine that current corresponding distance is second fault distance.
Such as: if the transmission line of electricity the first phase first end is to the distance of the fault point and/or the transmission line of electricity
Two-phase first end is small to the distance of the fault point and/or the distance of transmission line of electricity third phase first end to the fault point
In the total length of the transmission line of electricity, then the distance is second fault distance.
In one embodiment, if the second distance is equal to the total length of the transmission line of electricity, it is determined that the distance is simultaneously
It is not the transmission line of electricity first end to the distance of fault point, return step at this time: passes through first protective device 100 and obtain
Second side three-phase voltage, second side three-phase current and second zero-sequence current, and it is based on first side three-phase
Voltage, first side three-phase current and first zero-sequence current determine the transmission line of electricity first end to the fault point
Second distance.
As a result, using aforesaid way can calculate the transmission line of electricity first end to the fault point described second away from
From being how many, so that the accurate positionin of fault point can be realized.And then under the premise of realizing the accurate positionin of fault point, drop significantly
Low installation cost and installation cost.
At the same time, the present embodiment can also be matched by first protective device 100 and second protective device 200
It closes, when the transmission line of electricity breaks down, the three-phase current and three-phase voltage of the fault point two sides can be detected simultaneously, and really
The fixed first distance and the second distance.To realize the accurate positionin of fault point.It avoids the need for installing special
Traveling wave ranging device and GPS or Beidou time synchronization system carry out ranging, and then under the premise of realizing the accurate positionin of fault point, greatly
Installation cost and installation cost are reduced greatly.
Fig. 2 is referred to, in one embodiment, first protective device 100 includes: first detection module 110 and
One processing module 120.The first detection module 110 is used to detect first side three-phase voltage of first side of fault point
With first side three-phase current.The first processing module 120 is electrically connected with the first detection module 110.Described first
Processing module 120 and second protective device 200 communicate to connect.The first processing module 120 is used to be based on described first
Side three-phase current determines first zero-sequence current, and according to first side three-phase voltage, first side three-phase current, institute
It states the first zero-sequence current, second side three-phase voltage, second side three-phase current and second zero-sequence current and calculates institute
State the second distance of transmission line of electricity first end to the fault point.
In one embodiment, the specific structure of the first detection module 110 with no restrictions, as long as have detection described in
First side three-phase voltage of the first side of fault point and the function of first side three-phase current.In one embodiment
In, the first detection module 110 can be made of voltage detecting sensor and current detection sensor.In one embodiment,
The first detection module 110 can also be made of measure voltage & current instrument.Pass through the 110 real-time detection institute of first detection module
The first side three-phase voltage and first side three-phase current are stated, and will test result and be sent to the first processing module 120.
In one embodiment, the specific structure of the first processing module 120 does not do specific limitation, as long as having base
In first side, three-phase current determines the function of first zero-sequence current.In one embodiment, at described first
Reason module 120 can be made of single-chip microcontroller.In one embodiment, the first processing module 120 can also be by traditional processor
It constitutes.First zero-sequence current is determined based on first side three-phase current by the first processing module 120, and according to
First side three-phase voltage, first side three-phase current, first zero-sequence current, second side three-phase voltage, described
Two side three-phase currents and second zero-sequence current accurately calculate the transmission line of electricity first end to the fault point second away from
From to realize the accurate positionin to the fault point.
In one embodiment, second protective device 200 includes: the second detection module 210 and Second processing module
220.Second detection module 210 is used to detect second side three-phase voltage and described second of described fault point second side
Side three-phase current.The Second processing module 220 is electrically connected with second detection module 210.The Second processing module 220
It is communicated to connect with first protective device 100.The Second processing module 220 is used for true based on second side three-phase current
Fixed second zero-sequence current, and according to first side three-phase voltage, first side three-phase current, first zero sequence electricity
Stream, second side three-phase voltage, second side three-phase current and second zero-sequence current calculate the transmission line of electricity the
The first distance of two ends to the fault point.
In one embodiment, the specific structure of second detection module 210 with no restrictions, as long as have detection described in
Second side three-phase voltage of fault point second side and the function of second side three-phase current.In one embodiment
In, second detection module 210 can be made of voltage detecting sensor and current detection sensor.In one embodiment,
Second detection module 210 can also be made of measure voltage & current instrument.Pass through the 210 real-time detection institute of the second detection module
Second side three-phase voltage and second side three-phase current are stated, and will test result and be sent to the Second processing module 220.
In one embodiment, the specific structure of the Second processing module 220 does not do specific limitation, as long as having base
The function of second zero-sequence current is determined in second side three-phase current.In one embodiment, at described second
Reason module 220 can be made of single-chip microcontroller.In one embodiment, the Second processing module 220 can also be by traditional processor
It constitutes.Second zero-sequence current is determined based on second side three-phase current by the Second processing module 220, and according to
First side three-phase voltage, first side three-phase current, first zero-sequence current, second side three-phase voltage, described
Two side three-phase currents and second zero-sequence current accurately calculate the transmission line of electricity second end to the fault point first away from
From to realize the accurate positionin to the fault point.
In conclusion the application is when the transmission line of electricity breaks down, the three-phase current of fault inspecting two sides and three
Phase voltage, and cooperated by first protective device 100 and second protective device 200, that is, it can measure the tool of fault point
The accurate positionin of fault point is realized in body position.So as to avoid the special traveling wave ranging device of installation and GPS or Beidou clock synchronization system
System carries out ranging, and then under the premise of realizing the accurate positionin of fault point, greatly reduces installation cost and installation cost.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the concept of this application, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (11)
1. a kind of fault positioning method for transmission line, the method is special for detecting whether the transmission line of electricity occurs short circuit
Sign is, comprising:
The first side three-phase voltage of the transmission line of electricity is obtained by the first protective device (100) of the transmission line of electricity first end
With the first side three-phase current, and the first zero-sequence current, first side three-phase voltage are determined based on first side three-phase current
Including first the first phase voltage of side, first the second phase voltage of side and the first side third phase voltage, the first side three-phase current packet
Include first the first phase current of side, first the second phase current of side and the first side third phase current；
Second side three-phase voltage of the transmission line of electricity is obtained by the second protective device (200) of the transmission line of electricity second end
With second side three-phase current, and the second zero-sequence current, second side three-phase voltage are determined based on second side three-phase current
Including the first phase voltage of second side, the second phase voltage of second side and second side third phase voltage, second side three-phase current packet
Include the first phase current of second side, the second phase current of second side and second side third phase current, second protective device (200) with
First protective device (100) communication connection；
First side three-phase voltage, first side three-phase current and described are obtained by second protective device (200)
First zero-sequence current, and it is true based on second side three-phase voltage, second side three-phase current and second zero-sequence current
For the fixed transmission line of electricity second end to the first distance of fault point, the first distance includes first phase of transmission line of electricity second
It holds to the distance of the fault point, the distance of the transmission line of electricity the second phase second end to the fault point, the transmission line of electricity
Third phase second end to the fault point distance；
The first distance is compared with the total length of the transmission line of electricity, if the first distance is less than the power transmission line
The total length on road, it is determined that the first distance is Fisrt fault distance of the transmission line of electricity second end to the fault point.
2. fault positioning method for transmission line as described in claim 1, which is characterized in that pass through second protective device
(200) first side three-phase voltage, first side three-phase current and first zero-sequence current are obtained, and based on described the
Two side three-phase voltages, second side three-phase current and second zero-sequence current determine the transmission line of electricity second end to failure
Point first distance the step of include:
First side three-phase voltage, first side three-phase current and described are obtained by second protective device (200)
First zero-sequence current, and it is true based on second side three-phase voltage, second side three-phase current and second zero-sequence current
Determine the first impedance of the transmission line of electricity second end to the fault point；
Determine the transmission line of electricity second end to the of the fault point according to first impedance and based on default impedance factor
One distance.
3. fault positioning method for transmission line as claimed in claim 2, which is characterized in that described to be filled by second protection
It sets (200) and obtains first side three-phase voltage, first side three-phase current and first zero-sequence current, and based on described
Second side three-phase voltage, second side three-phase current and second zero-sequence current determine the transmission line of electricity second end to institute
The step of stating the first impedance of fault point include:
First side three-phase voltage, first side three-phase current and described are obtained by second protective device (200)
First zero-sequence current；
First side three-phase voltage, first side three-phase current, described the are based on by second protective device (200)
One zero-sequence current, second side three-phase voltage, second side three-phase current and second zero-sequence current calculate described defeated
Electric line second end to the fault point the first impedance, specific formula is as follows:
Wherein, ZNKFor first impedance,For first side three-phase current,For first side three-phase voltage,For first zero-sequence current,For second side three-phase voltage,For second side three-phase current,For
Second zero-sequence current, K are zero-utility theory, ZLFor the transmission line of electricity total impedance.
4. fault positioning method for transmission line as claimed in claim 3, which is characterized in that it is described according to first impedance simultaneously
The step of determining first distance of the transmission line of electricity second end to the fault point based on default impedance factor include:
Obtain the default impedance factor；
The transmission line of electricity second end is calculated to the of the fault point according to first impedance and the default impedance factor
One distance, specific formula is as follows:
Wherein, LNFor the first distance, Z is the default impedance factor.
5. fault positioning method for transmission line as described in claim 1, which is characterized in that pass through second protective device
(200) first side three-phase voltage, first side three-phase current and first zero-sequence current are obtained, and based on described the
Two side three-phase voltages, second side three-phase current and second zero-sequence current determine the transmission line of electricity second end to failure
Before the step of first distance of point, the method also includes:
Second side three-phase voltage, second side three-phase current and described are obtained by first protective device (100)
Second zero-sequence current, and it is true based on first side three-phase voltage, first side three-phase current and first zero-sequence current
For the fixed transmission line of electricity first end to the second distance of the fault point, the second distance includes first phase of transmission line of electricity
First end is to the distance of the fault point, the distance of the transmission line of electricity the second phase first end to the fault point, the transmission of electricity
Route third phase first end to the fault point distance；
The second distance is compared with the total length of the transmission line of electricity, if the second distance is less than the power transmission line
The total length on road, it is determined that the second distance is second fault distance of the transmission line of electricity first end to the fault point.
6. fault positioning method for transmission line as claimed in claim 5, which is characterized in that pass through first protective device
(100) second side three-phase voltage, second side three-phase current and second zero-sequence current are obtained, and based on described the
Side three-phase voltage, first side three-phase current and first zero-sequence current determine the transmission line of electricity first end to described
The step of second distance of fault point includes:
Second side three-phase voltage, second side three-phase current and described are obtained by first protective device (100)
Second zero-sequence current, and it is true based on first side three-phase voltage, first side three-phase current and first zero-sequence current
Determine the second impedance of the transmission line of electricity second end to the fault point；
The institute of the transmission line of electricity first end to the fault point is determined according to second impedance and based on default impedance factor
State second distance.
7. fault positioning method for transmission line as claimed in claim 6, which is characterized in that pass through first protective device
(100) second side three-phase voltage, second side three-phase current and second zero-sequence current are obtained, and based on described the
Side three-phase voltage, first side three-phase current and first zero-sequence current determine the transmission line of electricity first end to described
The step of second impedance of fault point includes:
Second side three-phase voltage, second side three-phase current and described are obtained by first protective device (100)
Second zero-sequence current；
First side three-phase voltage, first side three-phase current, described the are based on by first protective device (100)
One zero-sequence current, second side three-phase voltage, second side three-phase current and second zero-sequence current calculate described defeated
Electric line first end to the fault point the second impedance, specific formula is as follows:
Wherein, ZMKFor second impedance,For first side three-phase current,For first side three-phase voltage,For first zero-sequence current,For second side three-phase voltage,For second side three-phase current,For
Second zero-sequence current, K are zero-utility theory, ZLFor the transmission line of electricity total impedance.
8. fault positioning method for transmission line as claimed in claim 7, which is characterized in that according to second impedance and be based on
Default impedance factor determines that the step of second distance of the transmission line of electricity first end to the fault point includes:
Obtain the default impedance factor；
The transmission line of electricity first end is calculated to the of the fault point according to second impedance and the default impedance factor
Two distances, specific formula is as follows:
Wherein, LMFor the second distance, Z is the default impedance factor.
9. such as the described in any item fault positioning method for transmission line of claim 1-8, which is characterized in that the first protection dress
(100) and second protective device (200) is set to communicate to connect by optical fiber (300).
10. fault positioning method for transmission line as claimed in claim 9, which is characterized in that first protective device (100)
Include:
First detection module (110), for detecting first side three-phase voltage and described first of first side of fault point
Side three-phase current；
First processing module (120) is electrically connected with the first detection module (110), logical with second protective device (200)
Letter connection, for determining first zero-sequence current based on first side three-phase current, and according to first side three-phase electricity
Pressure, first side three-phase current, first zero-sequence current, second side three-phase voltage, second side three-phase current
The second distance of the transmission line of electricity first end to the fault point is calculated with second zero-sequence current.
11. fault positioning method for transmission line as claimed in claim 9, which is characterized in that second protective device (200)
Include:
Second detection module (210), for detecting second side three-phase voltage and described second of described fault point second side
Side three-phase current；
Second processing module (220) is electrically connected with second detection module (210), logical with first protective device (100)
Letter connection, for determining second zero-sequence current based on second side three-phase current, and according to first side three-phase electricity
Pressure, first side three-phase current, first zero-sequence current, second side three-phase voltage, second side three-phase current
The first distance of the transmission line of electricity second end to the fault point is calculated with second zero-sequence current.
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