CN116609618A - Method for achieving fault location based on primary and secondary fusion of breaker to obtain traveling wave - Google Patents
Method for achieving fault location based on primary and secondary fusion of breaker to obtain traveling wave Download PDFInfo
- Publication number
- CN116609618A CN116609618A CN202310729977.6A CN202310729977A CN116609618A CN 116609618 A CN116609618 A CN 116609618A CN 202310729977 A CN202310729977 A CN 202310729977A CN 116609618 A CN116609618 A CN 116609618A
- Authority
- CN
- China
- Prior art keywords
- traveling wave
- circuit breaker
- fault
- fault point
- wave signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000004927 fusion Effects 0.000 title claims abstract description 12
- 238000005070 sampling Methods 0.000 claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims description 34
- 238000012545 processing Methods 0.000 claims description 27
- 230000005428 wave function Effects 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 12
- 238000000691 measurement method Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 abstract description 8
- 239000003990 capacitor Substances 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000008054 signal transmission Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- 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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses a method for realizing fault location based on a secondary fusion breaker to acquire traveling waves, which relates to the technical field of power distribution network fault detection and comprises the following steps: installing a traveling wave sampling assembly in a circuit breaker on a distribution line; acquiring position information of all the circuit breakers, and constructing a topological graph based on the position information; acquiring a first traveling wave signal of a fault point; acquiring time information of the first traveling wave signal reaching all the circuit breakers to obtain first time data; based on the first time data, obtaining two circuit breakers closest to a fault point; and judging whether a branch line exists between the two circuit breakers based on the topological graph, if so, determining the position of the fault point by a three-terminal traveling wave ranging method, and if not, determining the position of the fault point by a double-terminal traveling wave ranging method. According to the invention, the traveling wave sampling assembly is combined with the circuit breaker, the circuit breaker topological graph is built again, the position of the fault point is determined by a double-end or three-end traveling wave ranging method, and finally, the accurate positioning of the fault of the complex distribution line is realized.
Description
Technical Field
The invention relates to the technical field of power distribution network fault detection, in particular to a method for achieving fault location based on a secondary fusion breaker to obtain traveling waves.
Background
In the construction of an automatic system of a distribution network, the detection and positioning of faults of the distribution line are always difficult problems of line operation maintenance personnel, particularly in severe weather and operation electricity-keeping time, once the fault happens to the line suddenly, the consequences caused by the fault are serious, and most of faults are hidden faults, the fault point is difficult to find by manual inspection or a long time is needed, so that a power enterprise needs to invest a great deal of effort to study fault detection technology, traveling wave ranging in the existing transmission line fault detection and positioning technology has mature experience, the most common traveling wave ranging method is double-end traveling wave ranging, the principle is that the fault position is judged according to the time difference of traveling waves generated by the fault point and moving towards buses at two sides to reach the two ends of the buses, but for complex distribution lines, the line nodes and branches are more, the equipment properties are various, the traveling waves of the fault point on the line are serious after refraction and reflection, the traveling waves are difficult to extract, and errors are caused to the fault detection and positioning result appear. Therefore, how to ensure the accuracy of fault detection and positioning is a problem to be solved for complex distribution lines.
Disclosure of Invention
In order to ensure the accuracy of fault detection and positioning of a complex distribution line, the invention provides a method for realizing fault positioning based on acquiring traveling waves by a secondary fusion breaker, which comprises the following steps:
a1. installing a traveling wave sampling assembly in a circuit breaker on a distribution line;
a2. acquiring the position information of all the circuit breakers, and constructing a topological graph based on the position information;
a3. acquiring a first traveling wave signal of a fault point;
a4. acquiring time information of the first line wave signal reaching all the circuit breakers to obtain first time data, wherein the first time data are t respectively 1 、t 2 … … and t n ；
a5. Based on the first time data, obtaining two circuit breakers closest to the fault point;
a6. and judging whether a branch line exists between the two circuit breakers based on the topological graph, if yes, determining the position of the fault point through a three-terminal traveling wave distance measurement method, and if not, determining the position of the fault point through a two-terminal traveling wave distance measurement method.
The principle of the invention is as follows: and combining the traveling wave sampling assembly with the circuit breakers on the distribution network line, then acquiring the position information of the circuit breakers and constructing a topological graph, and knowing the relative positions and distances among the circuit breakers through the topological graph, so that the follow-up fault positioning is facilitated. Acquiring a first traveling wave signal of a fault point, acquiring time data of the traveling wave signal reaching all the circuit breakers, finding out two circuit breakers closest to the fault point according to the time data, judging whether branch lines exist between the two circuit breakers based on a topological graph, if so, determining the position of the fault point by adopting a three-terminal traveling wave ranging method, and if not, determining the position of the fault point by adopting a double-terminal traveling wave ranging method. According to the invention, the traveling wave sampling assembly is combined with the circuit breaker, so that the on-site collection and processing of traveling wave signals are realized, the interference of traveling wave signal transmission during long-distance transmission is reduced, the accuracy of traveling wave signal collection in a complex distribution line is ensured, the position of a fault point is determined by using a double-end or three-end traveling wave ranging method based on the collected traveling wave signals and combined with a constructed circuit breaker topological graph, and the accurate positioning of the fault of the complex distribution line is finally realized.
Preferably, determining the fault point location by the double-ended traveling wave ranging method includes:
the two circuit breakers closest to the fault point are respectively a first circuit breaker and a second circuit breaker, and the time for the first line wave signal to reach the first circuit breaker is t 1 The time for the first traveling wave signal to reach the second circuit breaker is t 2 ；
Based on the topological graph, obtaining a distance s between the first circuit breaker and the second circuit breaker;
the fault point location is determined using the following formula,
s1＝(t 1 -t 2 )k/2+s/2；
s2＝(t 2 -t 1 )k/2+s/2；
s1 is the distance from the fault point to the first circuit breaker, s2 is the distance from the fault point to the second circuit breaker, and k is the propagation speed of the first traveling wave signal in the line.
When no branch line exists between the first circuit breaker and the second circuit breaker, the distance from the fault point to the first circuit breaker and the second circuit breaker can be accurately calculated through the formula.
Preferably, determining the fault point position by the three-terminal traveling wave ranging method includes:
acquiring a third circuit breaker which is a circuit breaker on a branch line between the first circuit breaker and the second circuit breaker, wherein the time for the first traveling wave signal to reach the third circuit breaker is t 3 ；
Based on the topological graph, obtaining a distance m between the first circuit breaker and the third circuit breaker, and obtaining a distance n between the second circuit breaker and the third circuit breaker;
the fault point location is determined using the following formula,
s1＝(t 1 -t 3 )k/2+m/2；
s2＝(t 2 -t 3 )k/2+n/2；
s3＝(t 3 -t 1 )k/2+m/2；
s3 is the distance from the fault point to the third circuit breaker.
When a branch line exists between the first circuit breaker and the second circuit breaker, namely the line is a T-junction line, although the fault ranging result can be calculated through double-end traveling wave ranging, the branch of the fault point needs to be judged, and if the fault branch is judged to have a larger error, the accuracy of the fault ranging result obtained through double-end traveling wave ranging is lower. Therefore, fault distance measurement is carried out based on the three-terminal traveling wave distance measurement principle, and the distances from the fault point to the first circuit breaker, the second circuit breaker and the third circuit breaker can be accurately calculated through the formula.
Preferably, a plurality of first line wave signals of the fault point in a preset time period are obtained, and steps a4-a6 are circularly executed to obtain a plurality of fault distance measurement results of the fault point; and analyzing a plurality of distance measurement results of the fault point to determine the position of the fault point.
The fault location is performed by using one traveling wave signal, and the fault location result may deviate due to reasons such as line interference, so that a plurality of traveling wave signals of a fault point in a preset time period are obtained, a plurality of fault distance measurement results are obtained by calculation based on the plurality of traveling wave signals, and the positions of the fault point are finally determined by analyzing and comparing the plurality of fault distance measurement results, so that the accuracy of fault point location is improved.
Preferably, the method uses GPS to control the time synchronization of the traveling wave sampling components in all the circuit breakers.
The time synchronization of the traveling wave sampling assembly in the circuit breaker on the control line is controlled by adopting GPS/Beidou time synchronization, so that an absolute time scale is assigned to the traveling wave signal when a fault occurs.
Preferably, the method further comprises arranging the structure and layout between the traveling wave sampling assembly and the circuit breaker based on a uniform field strength distribution principle.
The structure and the layout between the traveling wave sampling assembly and the circuit breaker are arranged based on the principle of uniform field intensity distribution, so that the influence on the accuracy of traveling wave acquisition caused by high-frequency signal interference sources generated in a field strong concentrated area is avoided.
Preferably, the traveling wave sampling assembly comprises a voltage sensor, a filter, a phase-mode signal conversion module, a traveling wave signal processing module and a fault location calculation module, wherein the input end of the voltage sensor is connected with the incoming line side of the circuit breaker, the output end of the voltage sensor is connected with the input end of the filter, the grounding end of the filter is grounded, the output end of the filter is connected with the input end of the phase-mode signal conversion module, the output end of the phase-mode signal conversion module is connected with the input end of the traveling wave signal processing module, and the output end of the traveling wave signal processing module is connected with the input end of the fault location calculation module.
The circuit breaker is installed on a high-voltage line, the traveling wave sampling assembly is installed on the circuit breaker, the incoming line side of the circuit breaker is connected with the voltage sensor, the voltage sensor is connected with the filter, the filter is connected with the phase-mode signal conversion module, the phase-mode signal conversion module is connected with the traveling wave signal processing module, the traveling wave signal processing module is connected with the fault location calculation module, the traveling wave signal acquisition module is combined with the circuit breaker, the on-site acquisition and processing of traveling wave signals are realized, the interference of traveling wave signal transmission during long-distance transmission is reduced, the accuracy of traveling wave signal acquisition in a complex distribution circuit is guaranteed, and meanwhile the circuit breaker also has the advantages of simple structure and convenience in installation.
Preferably, the phase-to-analog signal conversion module includes a differential amplifier D1, a differential amplifier D2, and a differential amplifier D3, the a-phase traveling wave signal filtered by the filter is connected to the in-phase input end of the differential amplifier D1 and the anti-phase input end of the differential amplifier D3, the B-phase traveling wave signal filtered by the filter is connected to the anti-phase input end of the differential amplifier D1 and the in-phase input end of the differential amplifier D2, the C-phase traveling wave signal filtered by the filter is connected to the anti-phase input end of the differential amplifier D2 and the in-phase input end of the differential amplifier D3, and the output end of the differential amplifier D1, the output end of the differential amplifier D2, and the output end of the differential amplifier D3 are all connected to the input end of the traveling wave signal processing module.
In the prior art, most of the acquisition of the traveling wave signals is to acquire phase mode signals, when the grounding of line equipment is unreliable or the grounding resistance is overlarge, larger traveling wave interference is caused, so that the extraction of the traveling wave characteristic signals is influenced.
Preferably, the output end of the filter is connected with the input end of the phase-mode signal conversion module through a coaxial cable.
Wherein, traveling wave signals are transmitted through the coaxial cable, so that interference in the traveling wave signal transmission process can be avoided.
Preferably, the traveling wave sampling assembly further comprises a traveling wave function control box, the traveling wave function control box is connected with the circuit breaker, and the voltage sensor, the filter, the phase-mode signal conversion module, the traveling wave signal processing module and the fault positioning calculation module are all fixed in the traveling wave function control box.
The traveling wave function control box is connected with the circuit breaker and provides protection and fixing functions for the voltage sensor, the filter, the phase-mode signal conversion module, the traveling wave signal processing module and the fault positioning calculation module.
The one or more technical schemes provided by the invention have at least the following technical effects or advantages:
according to the invention, the traveling wave sampling assembly is combined with the circuit breaker, so that the on-site collection and processing of traveling wave signals are realized, the interference of traveling wave signal transmission during long-distance transmission is reduced, the accuracy of traveling wave signal collection in a complex distribution line is ensured, the position of a fault point is determined by using a double-end or three-end traveling wave ranging method based on the collected traveling wave signals and combined with a constructed circuit breaker topological graph, and the accurate positioning of the fault of the complex distribution line is finally realized.
The invention also provides a phase mode signal conversion module, which converts the three-phase fault traveling wave signals into line mode signals through the differential amplifier, can filter the common mode part of the three-phase traveling wave characteristic signals, simultaneously strengthen the traveling wave characteristic signals, can effectively resist the interference on a line, and simultaneously avoid the traveling wave interference caused by unreliable grounding of the line equipment or overlarge grounding resistance, thereby further ensuring the accuracy of the traveling wave signal acquisition.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention;
FIG. 1 is a schematic flow chart of a method for achieving fault location based on a secondary fused breaker to obtain traveling waves;
fig. 2 is a schematic topology of a circuit breaker on a distribution line in accordance with the present invention;
FIG. 3 is a schematic diagram of the connection of the traveling wave sampling assembly to the circuit breaker in accordance with the present invention;
FIG. 4 is a circuit diagram of the voltage sensor and filter connection of the present invention;
fig. 5 is a circuit diagram of a phase-mode signal conversion module according to the present invention.
Wherein, 11-circuit breaker, 12-coaxial cable.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. In addition, the embodiments of the present invention and the features in the embodiments may be combined with each other without collision.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than within the scope of the description, and the scope of the invention is therefore not limited to the specific embodiments disclosed below.
Example 1
Referring to fig. 1, fig. 1 is a flow chart of a method for achieving fault location based on a secondary fusion breaker to obtain traveling waves, where the method includes:
a1. installing a traveling wave sampling assembly in a circuit breaker on a distribution line;
a2. acquiring the position information of all the circuit breakers, and constructing a topological graph based on the position information;
a3. acquiring a first traveling wave signal of a fault point;
a4. acquiring time information of the first traveling wave signal reaching all the circuit breakers to obtain first time data, wherein the first time data are respectivelyt 1 、t 2 … … and t n ；
a5. Based on the first time data, obtaining two circuit breakers closest to the fault point;
a6. and judging whether a branch line exists between the two circuit breakers based on the topological graph, if yes, determining the position of the fault point through a three-terminal traveling wave distance measurement method, and if not, determining the position of the fault point through a two-terminal traveling wave distance measurement method.
In the embodiment of the invention, a traveling wave sampling assembly is arranged in a circuit breaker 11 on a distribution line, the traveling wave sampling assembly comprises a voltage sensor, a filter, a phase-mode signal conversion module, a traveling wave signal processing module and a fault location calculation module, the input end of the voltage sensor is connected with the wire inlet side of the circuit breaker 11, the output end of the voltage sensor is connected with the input end of the filter, the grounding end of the filter is grounded, the output end of the filter is connected with the input end of the phase-mode signal conversion module, the output end of the phase-mode signal conversion module is connected with the input end of the traveling wave signal processing module, and the output end of the traveling wave signal processing module is connected with the input end of the fault location calculation module. By combining the traveling wave sampling assembly with the circuit breaker 11, the in-situ sampling and processing of traveling wave signals are realized, the transmission interference of the traveling wave signals during long-distance transmission is reduced, and the accuracy of the traveling wave signal acquisition in a complex distribution line is ensured.
In the embodiment of the invention, the position information of the circuit breakers in the power distribution network is obtained, the topological graph of the circuit breakers is constructed based on the position information, the position and distance information among the circuit breakers can be known through the topological graph, the generation of the topological graph can be manually drawn or generated through a distribution network PMS system, and the generation mode is not particularly limited. And acquiring the first traveling wave signal of the fault point in the preset time period, wherein when fault positioning is carried out, the fault positioning cannot be accurately carried out only by one traveling wave signal, so that the accuracy of the fault positioning is ensured by acquiring a plurality of traveling wave signals in the preset time period and using the traveling wave signals for subsequent fault positioning. Acquiring time of a first traveling wave signal reaching each circuit breaker to obtain first time data, finding two circuit breakers closest to a fault point by analyzing the first time data, judging whether a branch line exists between the two circuit breakers based on a topological graph, judging that the circuit is a T-junction circuit if the branch line exists, and performing fault positioning by adopting a three-terminal traveling wave ranging method; and if the branch line does not exist, adopting a double-end traveling wave ranging method to perform fault location. Because for the T-junction line, although the double-end traveling wave ranging method can calculate the fault ranging result, the branch of the fault point needs to be judged, and when a large error occurs in the judgment of the fault branch, the reliability of the fault positioning result obtained by the double-end traveling wave ranging method is lower. According to the invention, the traveling wave sampling assembly is combined with the circuit breaker 11, and the position of a fault point is determined by using a double-end or three-end traveling wave ranging method based on the acquired traveling wave signals and combined with the constructed circuit breaker topological graph, so that the accurate positioning of the fault of the complex distribution line is finally realized.
Referring to fig. 2, fig. 2 is a schematic topology diagram of a circuit breaker on a distribution line according to the present invention, and determining the fault point position by a double-ended traveling wave ranging method includes:
the two circuit breakers closest to the fault point are respectively a first circuit breaker and a second circuit breaker, and the time for the first line wave signal to reach the first circuit breaker is t 1 The time for the first traveling wave signal to reach the second circuit breaker is t 2 ；
Based on the topological graph, obtaining a distance s between the first circuit breaker and the second circuit breaker;
the fault point location is determined using the following formula,
s1＝(t 1 -t 2 )k/2+s/2 (1)；
s2＝(t 2 -t 1 )k/2+s/2 (2)；
s1 is the distance from the fault point to the first circuit breaker, s2 is the distance from the fault point to the second circuit breaker, and k is the propagation speed of the first traveling wave signal in the line.
The first circuit breaker is the circuit breaker 1, and the second circuit breaker is the circuit breaker 2, and when there is not the branch line between circuit breaker 1 and the circuit breaker 2, namely the branch line that circuit breaker 3 is located does not exist, fixes a position the trouble based on bi-polar traveling wave ranging principle this moment, can accurately calculate the distance between fault point distance circuit breaker 1 and the circuit breaker 2 through formula (1) and (2). The above examples are for illustrative purposes only, and can be adjusted as desired, and the present invention is not limited thereto.
Preferably, determining the fault point position by the three-terminal traveling wave ranging method includes:
acquiring a third circuit breaker which is a circuit breaker on a branch line between the first circuit breaker and the second circuit breaker, wherein the time for the first traveling wave signal to reach the third circuit breaker is t 3 ；
Based on the topological graph, obtaining a distance m between the first circuit breaker and the third circuit breaker, and obtaining a distance n between the second circuit breaker and the third circuit breaker;
the fault point location is determined using the following formula,
s1＝(t 1 -t 3 )k/2+m/2 (3)；
s2＝(t 2 -t 3 )k/2+n/2 (4)；
s3＝(t 3 -t 1 )k/2+m/2 (5)；
s3 is the distance from the fault point to the third circuit breaker.
When a branch line exists between the circuit breaker 1 and the circuit breaker 2, that is, the line is a T-junction line, although the fault ranging result can be calculated through double-end traveling wave ranging, a branch of the fault point needs to be determined, if a larger error occurs in the fault branch determination, the accuracy of the fault ranging result obtained through double-end traveling wave ranging is lower. Therefore, fault distance measurement is carried out based on the three-terminal traveling wave distance measurement principle, and the distances from the fault point to the circuit breaker 1, the circuit breaker 2 and the circuit breaker 3 can be accurately calculated through formulas (3), (4) and (5). The above examples are for illustrative purposes only, and can be adjusted as desired, and the present invention is not limited thereto.
The method comprises the steps of obtaining a plurality of first line wave signals of a fault point in a preset time period, and circularly executing steps a4-a6 to obtain a plurality of fault distance measurement results of the fault point; and analyzing a plurality of distance measurement results of the fault point to determine the position of the fault point. The fault location is carried out by utilizing one traveling wave signal, and the fault location result is possibly deviated due to line interference and other reasons, so that a plurality of fault location results are obtained by acquiring a plurality of traveling wave signals of the fault point in a preset time period and calculating based on the plurality of traveling wave signals, and the position of the fault point is finally determined by analyzing and comparing the plurality of fault location results, thereby further improving the accuracy of fault location.
The method adopts GPS to control the time synchronization of the traveling wave sampling components in all the circuit breakers. And the time synchronization of the traveling wave sampling assembly in the circuit breaker on the control line is controlled by adopting GPS/Beidou time synchronization, so that an absolute time scale is assigned to the traveling wave signal when a fault occurs.
The method further comprises the step of arranging the structure and layout between the traveling wave sampling assembly and the circuit breaker based on a uniform field intensity distribution principle. Based on the principle of uniform field intensity distribution, the structure and layout between the traveling wave sampling assembly and the circuit breaker are arranged, and the influence on the accuracy of traveling wave acquisition caused by high-frequency signal interference sources generated in a field strong concentrated area is avoided.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a connection between a traveling wave sampling assembly and a circuit breaker 11 in the present invention, where the traveling wave sampling assembly includes a voltage sensor, a filter, a phase-mode signal conversion module, a traveling wave signal processing module and a fault location calculation module, an input end of the voltage sensor is connected to a line incoming side of the circuit breaker 11, an output end of the voltage sensor is connected to an input end of the filter, a ground connection of the filter is provided, an output end of the filter is connected to an input end of the phase-mode signal conversion module, an output end of the phase-mode signal conversion module is connected to an input end of the traveling wave signal processing module, and an output end of the traveling wave signal processing module is connected to an input end of the fault location calculation module. The voltage sensor adopts a capacitive voltage division principle, can sense the measured voltage, converts the obtained voltage into direct current voltage and isolates and outputs an analog traveling wave signal within a certain period of time, a filter filters a power frequency signal in the analog traveling wave signal, simultaneously amplifies a high-frequency characteristic signal, and a phase-mode signal conversion module performs phase-mode conversion on the traveling wave signal after filtering and amplifying, namely converts a three-phase traveling wave signal into 3 line-mode signals, can filter a common mode part in the three-phase traveling wave signal, and ensures the accuracy of traveling wave signal extraction. The traveling wave processing module is used for carrying out digital conversion and storage on traveling wave signals subjected to phase mode conversion, and finally the fault positioning calculation module is used for positioning faults based on the acquired traveling wave signals.
Referring to fig. 4, fig. 4 is a circuit diagram of a voltage sensor connected to a filter in the present invention, in an embodiment of the present invention, the voltage sensor includes a capacitor C1 and a capacitor C2, an anode of the capacitor C1 is connected to a line incoming side of the breaker main body, a cathode of the capacitor C1 is connected to an anode of the capacitor C2, and a cathode of the capacitor C2 is connected to an input end of the filter. The voltage sensor can sense the measured voltage, convert the obtained voltage into direct current voltage within a certain time and isolate and output the analog traveling wave signal. The filter comprises a piezoresistor mov, a resistor R1 and a capacitor C3, wherein one end of the piezoresistor mov, one end of the resistor R1 and the positive electrode of the capacitor C3 are connected with the negative electrode of the capacitor C2, the other end of the piezoresistor mov, the other end of the resistor R1 and the negative electrode of the capacitor C3 are grounded, and the positive electrode of the capacitor C3 is also used for being connected with the input end of the phase-mode signal conversion module. The filter can filter the power frequency signal of the line, and amplify the high-frequency characteristic signal at the same time, so that the fault characteristic signal on the line can be accurately obtained.
Referring to fig. 5, fig. 5 is a circuit diagram of a phase-to-mode signal conversion module in the present invention, where the phase-to-mode signal conversion module includes a differential amplifier D1, a differential amplifier D2, and a differential amplifier D3, an a-phase traveling wave signal filtered by the filter is connected to an in-phase input end of the differential amplifier D1 and an inverting input end of the differential amplifier D3, a B-phase traveling wave signal filtered by the filter is connected to an inverting input end of the differential amplifier D1 and an in-phase input end of the differential amplifier D2, and a C-phase traveling wave signal filtered by the filter is connected to an inverting input end of the differential amplifier D2 and an in-phase input end of the differential amplifier D3, and an output end of the differential amplifier D1, an output end of the differential amplifier D2, and an output end of the differential amplifier D3 are all connected to an input end of the traveling wave signal processing module. The phase-mode signal conversion module adopts a differential input principle, each two-phase pair of ABC three-phase traveling wave signals are respectively connected into differential amplifiers D1-D3, the three-phase traveling wave signals are converted into 3 line-mode signals by 3 differential amplifiers, common mode parts in the three-phase traveling wave signals can be filtered, and meanwhile, the three-phase traveling wave signals are amplified in an enhanced mode, so that interference on a line is effectively resisted, traveling wave interference caused by unreliable grounding of line equipment or overlarge grounding resistance is avoided, and the accuracy of traveling wave signal extraction is further ensured.
Wherein the output end of the filter is connected with the input end of the phase-mode signal conversion module through a coaxial cable 12. The traveling wave signal is transmitted through the coaxial cable 12, so that the traveling wave signal can be effectively prevented from being interfered in the transmission process, and the accuracy of the traveling wave signal acquisition is improved.
The traveling wave sampling assembly further comprises a traveling wave function control box, the traveling wave function control box is connected with the circuit breaker 11, and the voltage sensor, the filter, the phase-mode signal conversion module, the traveling wave signal processing module and the fault positioning calculation module are all fixed in the traveling wave function control box. The traveling wave function control box is arranged on the breaker 11, the voltage sensor, the filter, the phase-mode signal conversion module, the traveling wave signal processing module and the fault positioning calculation module are all arranged in the traveling wave function control box, the traveling wave function control box plays roles of protection and fixation,
while preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. The method for achieving fault location based on the acquisition of the traveling wave by the secondary fusion circuit breaker is characterized by comprising the following steps of:
a1. installing a traveling wave sampling assembly in a circuit breaker on a distribution line;
a2. acquiring the position information of all the circuit breakers, and constructing a topological graph based on the position information;
a3. acquiring a first traveling wave signal of a fault point;
a4. acquiring time information of the first line wave signal reaching all the circuit breakers to obtain first time data, wherein the first time data are t respectively 1 、t 2 … … and t n ；
a5. Based on the first time data, obtaining two circuit breakers closest to the fault point;
a6. and judging whether a branch line exists between the two circuit breakers based on the topological graph, if yes, determining the position of the fault point through a three-terminal traveling wave distance measurement method, and if not, determining the position of the fault point through a two-terminal traveling wave distance measurement method.
2. The method for achieving fault location based on a secondary fused circuit breaker to obtain traveling waves according to claim 1, wherein determining the fault point location through a double-ended traveling wave ranging method comprises:
acquiring the distance from the faultThe two nearest circuit breakers are a first circuit breaker and a second circuit breaker respectively, and the time for the first line wave signal to reach the first circuit breaker is t 1 The time for the first traveling wave signal to reach the second circuit breaker is t 2 ；
Based on the topological graph, obtaining a distance s between the first circuit breaker and the second circuit breaker;
the fault point location is determined using the following formula,
s1＝(t 1 -t 2 )k/2+s/2；
s2＝(t 2 -t 1 )k/2+s/2；
s1 is the distance from the fault point to the first circuit breaker, s2 is the distance from the fault point to the second circuit breaker, and k is the propagation speed of the first traveling wave signal in the line.
3. The method for achieving fault location based on a secondary fused circuit breaker to obtain traveling waves according to claim 2, wherein determining the fault point location through a three-terminal traveling wave ranging method comprises:
acquiring a third circuit breaker which is a circuit breaker on a branch line between the first circuit breaker and the second circuit breaker, wherein the time for the first traveling wave signal to reach the third circuit breaker is t 3 ；
Based on the topological graph, obtaining a distance m between the first circuit breaker and the third circuit breaker, and obtaining a distance n between the second circuit breaker and the third circuit breaker;
the fault point location is determined using the following formula,
s1＝(t 1 -t 3 )k/2+m/2；
s2＝(t 2 -t 3 )k/2+n/2；
s3＝(t 3 -t 1 )k/2+m/2；
s3 is the distance from the fault point to the third circuit breaker.
4. The method for achieving fault location based on the secondary fusion circuit breaker obtaining the traveling wave according to claim 1, further comprising: a plurality of first line wave signals of the fault point in a preset time period are obtained, and steps a4-a6 are circularly executed to obtain a plurality of fault distance measurement results of the fault point; and analyzing a plurality of fault distance measurement results of the fault points to determine the positions of the fault points.
5. A method for achieving fault location based on a secondary fused circuit breaker obtaining traveling waves according to any one of claims 1-4, wherein said method uses GPS to control the time synchronization of said traveling wave sampling components in all said circuit breakers.
6. The method for fault location based on a secondary fused circuit breaker according to any of claims 1-4 further comprising arranging the structure and layout between the traveling wave sampling assembly and the circuit breaker based on a uniform field strength distribution principle.
7. The method for achieving fault location based on the secondary fusion circuit breaker according to claim 1, wherein the traveling wave sampling assembly comprises a voltage sensor, a filter, a phase-mode signal conversion module, a traveling wave signal processing module and a fault location calculation module, wherein the input end of the voltage sensor is connected with the incoming line side of the circuit breaker, the output end of the voltage sensor is connected with the input end of the filter, the grounding end of the filter is grounded, the output end of the filter is connected with the input end of the phase-mode signal conversion module, the output end of the phase-mode signal conversion module is connected with the input end of the traveling wave signal processing module, and the output end of the traveling wave signal processing module is connected with the input end of the fault location calculation module.
8. The method for achieving fault location based on a secondary fusion circuit breaker according to claim 7, wherein the phase-mode signal conversion module comprises a differential amplifier D1, a differential amplifier D2 and a differential amplifier D3, the a-phase traveling wave signal filtered by the filter is respectively connected with the non-inverting input terminal of the differential amplifier D1 and the inverting input terminal of the differential amplifier D3, the B-phase traveling wave signal filtered by the filter is respectively connected with the inverting input terminal of the differential amplifier D1 and the non-inverting input terminal of the differential amplifier D2, the C-phase traveling wave signal filtered by the filter is respectively connected with the inverting input terminal of the differential amplifier D2 and the non-inverting input terminal of the differential amplifier D3, and the output terminal of the differential amplifier D1, the output terminal of the differential amplifier D2 and the output terminal of the differential amplifier D3 are respectively connected with the input terminal of the traveling wave signal processing module.
9. The method for achieving fault location based on the secondary fusion circuit breaker obtaining traveling waves according to claim 7, wherein the output end of the filter is connected with the input end of the phase-mode signal conversion module through a coaxial cable.
10. The method for achieving fault location based on the secondary fusion circuit breaker according to claim 7, wherein the traveling wave sampling assembly further comprises a traveling wave function control box, the traveling wave function control box is connected with the circuit breaker, and the voltage sensor, the filter, the phase-mode signal conversion module, the traveling wave signal processing module and the fault location calculation module are all fixed in the traveling wave function control box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310729977.6A CN116609618B (en) | 2023-06-20 | 2023-06-20 | Method for achieving fault location based on primary and secondary fusion of breaker to obtain traveling wave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310729977.6A CN116609618B (en) | 2023-06-20 | 2023-06-20 | Method for achieving fault location based on primary and secondary fusion of breaker to obtain traveling wave |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116609618A true CN116609618A (en) | 2023-08-18 |
| CN116609618B CN116609618B (en) | 2024-05-14 |
Family
ID=87683657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310729977.6A Active CN116609618B (en) | 2023-06-20 | 2023-06-20 | Method for achieving fault location based on primary and secondary fusion of breaker to obtain traveling wave |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116609618B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117538684A (en) * | 2023-12-12 | 2024-02-09 | 西安兴汇电力科技有限公司 | High-frequency signal acquisition and processing system for pole-mounted circuit breaker |
| CN118275825A (en) * | 2024-06-03 | 2024-07-02 | 东方电子股份有限公司 | Data processing method and system for distribution line traveling wave ranging |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157981A (en) * | 2011-02-28 | 2011-08-17 | 清华大学 | High-speed data acquisition and digital signal processing device |
| CN110658420A (en) * | 2019-11-01 | 2020-01-07 | 国网江苏省电力有限公司徐州供电分公司 | Double-end traveling wave fault location method for hybrid power transmission line based on wavelet transformation and time search strategy |
| CN111381130A (en) * | 2020-03-16 | 2020-07-07 | 国网安徽省电力有限公司阜阳供电公司 | T-connection line fault positioning method and system considering traveling wave velocity |
| CN216697089U (en) * | 2021-12-29 | 2022-06-07 | 国网安徽省电力有限公司电力科学研究院 | Multifunctional standard voltage source for state detection of power equipment |
| CN115308538A (en) * | 2022-10-11 | 2022-11-08 | 西安兴汇电力科技有限公司 | Power distribution network fault positioning method, system, terminal and storage medium based on YOLOV5 |
-
2023
- 2023-06-20 CN CN202310729977.6A patent/CN116609618B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157981A (en) * | 2011-02-28 | 2011-08-17 | 清华大学 | High-speed data acquisition and digital signal processing device |
| CN110658420A (en) * | 2019-11-01 | 2020-01-07 | 国网江苏省电力有限公司徐州供电分公司 | Double-end traveling wave fault location method for hybrid power transmission line based on wavelet transformation and time search strategy |
| CN111381130A (en) * | 2020-03-16 | 2020-07-07 | 国网安徽省电力有限公司阜阳供电公司 | T-connection line fault positioning method and system considering traveling wave velocity |
| CN216697089U (en) * | 2021-12-29 | 2022-06-07 | 国网安徽省电力有限公司电力科学研究院 | Multifunctional standard voltage source for state detection of power equipment |
| CN115308538A (en) * | 2022-10-11 | 2022-11-08 | 西安兴汇电力科技有限公司 | Power distribution network fault positioning method, system, terminal and storage medium based on YOLOV5 |
Non-Patent Citations (5)
| Title |
|---|
| 何锐;韩涛;顾泽玉;苏国泷;史艳刚;: "基于行波折反射特征的单相接地故障区段定位方法", 智慧电力, vol. 46, no. 01, pages 77 - 81 * |
| 曲广龙;杨洪耕;吴晓清;周辉;: "考虑电网拓扑结构的行波故障定位方法", 电力系统及其自动化学报, no. 06, pages 117 - 121 * |
| 王炳刚;: "基于配电自动化系统的配电网精确故障定位研究", 才智, no. 20, pages 146 - 147 * |
| 苏彪;于建友;郑益慧;李立学;王昕;杨景波;: "基于分布式检测的多分支输电线路故障精确定位技术", 电气自动化, no. 03, pages 36 - 37 * |
| 董爱华;李志超;闵天文;仝兆景;: "基于多个测量点的高压输电线路故障定位新方法", 控制工程, vol. 23, no. 03, pages 411 - 416 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117538684A (en) * | 2023-12-12 | 2024-02-09 | 西安兴汇电力科技有限公司 | High-frequency signal acquisition and processing system for pole-mounted circuit breaker |
| CN118275825A (en) * | 2024-06-03 | 2024-07-02 | 东方电子股份有限公司 | Data processing method and system for distribution line traveling wave ranging |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116609618B (en) | 2024-05-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN116609618B (en) | Method for achieving fault location based on primary and secondary fusion of breaker to obtain traveling wave | |
| CN104597376B (en) | A kind of high voltage direct current transmission line fault location method considering actual measurement velocity of wave | |
| CN109001594B (en) | Fault traveling wave positioning method | |
| CN108344923B (en) | High-adaptability power transmission line fault location method and system | |
| CN109444657B (en) | Method for positioning high-resistance grounding fault section of power distribution network | |
| CN107329045B (en) | Least square positioning method for distribution network fault | |
| CN115047284B (en) | High-voltage direct-current transmission line fault location method and system | |
| CN103604991A (en) | Device and method for measuring bus voltage phase of capacitor voltage transformer | |
| CN118226202B (en) | Traveling wave positioning type secondary fusion switch and fault positioning method | |
| CN115097253A (en) | MMC-HVDC direct current transmission line fault distance measurement method and system | |
| CN103427405B (en) | The differential guard method of transmission line of electricity based on Higher Order Cumulants | |
| CN117192292B (en) | Lightning grounding electrode line fault distance measurement method and system | |
| CN115015686A (en) | LCC-VSC hybrid high-voltage direct-current transmission line fault distance measurement method and system | |
| CN116930685A (en) | Single-end ranging method suitable for single-phase earth fault of power distribution network | |
| CN115015687A (en) | Four-end annular flexible direct-current power grid fault location method and system | |
| CN114966307A (en) | Fault positioning method and device | |
| CN113533900B (en) | System and method for judging fault section of power distribution network cable hybrid line | |
| CN112858842B (en) | Small current ground fault distance measurement method based on transient zero-modulus component | |
| CN113702762B (en) | Distribution network single-phase earth fault distance measurement method utilizing zero sequence information quantity | |
| CN116773960A (en) | Single-ended fusion multi-terminal hybrid power distribution network fault positioning method for optimizing wave recording device distribution point | |
| CN115825649A (en) | Cable fault point midpoint traveling wave distance measurement online positioning system based on current magnetic signal and parameter optimization variational modal decomposition | |
| CN115951174A (en) | Traveling wave ranging network correction method and system based on power grid abnormal credible area identification | |
| CN115166411B (en) | Single-loop T-type power transmission line fault location method based on fault branch judgment | |
| CN114200246B (en) | Fault location method and system for direct-current transmission line | |
| CN109067375A (en) | A kind of PT secondary side neutral point multipoint earthing sensed current signal amplifying circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |