CN111175610A - Fault positioning system and method for distribution line - Google Patents
Fault positioning system and method for distribution line Download PDFInfo
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- CN111175610A CN111175610A CN202010081964.9A CN202010081964A CN111175610A CN 111175610 A CN111175610 A CN 111175610A CN 202010081964 A CN202010081964 A CN 202010081964A CN 111175610 A CN111175610 A CN 111175610A
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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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- 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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- 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
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Abstract
The invention provides a fault positioning system and method of a distribution line, which comprises a signal generating device, a plurality of partial discharge detection sensors and a control center, wherein the signal generating device is used for generating a signal; the signal generating device is connected with a calibration interface of the partial discharge detection sensor and used for injecting a first pulse signal into a distribution line to be detected, wherein a second pulse signal is generated when the distribution line is in fault; the partial discharge detection sensors are sequentially installed along a distribution line in a segmented mode, one end of each partial discharge detection sensor is connected with one end of each coupling capacitor, and the other end of each coupling capacitor is grounded and used for acquiring an analog voltage signal, a first pulse signal and a second pulse signal in the distribution line; and the control center is used for receiving, analyzing and processing the analog voltage signal, the first pulse signal and the second pulse signal, and calculating to obtain distance information and fault position information of the installation positions of two adjacent partial discharge detection sensors. The quick and accurate positioning of the fault position of the distribution line can be realized, and the method has the advantages of being efficient, intelligent, convenient and the like.
Description
Technical Field
The invention belongs to the technical field of power grid fault detection and positioning, and particularly relates to a fault positioning system and method for a power distribution line.
Background
The power distribution network is a supply and demand link connecting a power transmission network and power consumers, belongs to the tail end of a power system, directly faces the consumers, and is an important public infrastructure for serving the residents. The length of the power distribution network line accounts for about 90% of the length of each level of power grid line, the power distribution network line has the characteristics of multiple line structure changes and complex fault conditions, statistical data show that more than 80% of power failure accidents are caused by power distribution network faults, the safe and stable operation of a power grid can be seriously influenced after the line faults, and a key area can be subjected to large-scale power failure in serious cases, so that huge loss is caused to national economy and people's life, and even personal safety is endangered.
The most common fault of a distribution line is an earth fault, where the probability of occurrence of a single-phase earth fault is the highest. Accurate positioning of power distribution network faults is a key technology for reducing power failure time and accelerating power supply recovery. The conventional single-phase earth fault positioning method utilizes an overvoltage signal, but the method has low precision, unsatisfactory error control and low fault finding efficiency, and needs to invest a large amount of manpower and material resources. In addition, the power distribution network line structure changes a lot, and when a latent fault such as an insulation fault of a device and a power distribution line in a system occurs, the problem of difficulty in fault location also exists. In addition, in the prior art, a method for positioning a high-resistance ground fault section of a power distribution network is disclosed, wherein each fault positioning terminal is used for performing section division on the power distribution network to acquire data of each fault positioning terminal, current and voltage data acquired by each terminal are processed according to recording data, whether a ground fault occurs in the power distribution network is judged according to comparison of processing results of each terminal data, and a ground fault section is determined.
Therefore, when a single-phase earth fault and a latent fault occur in the power distribution network, how to quickly locate the fault and improve the fault location accuracy is a technical problem to be solved urgently by the person in the art.
Disclosure of Invention
The invention provides a fault positioning system and method for a power distribution line, and solves the technical problems of rapid fault positioning and improvement of fault positioning accuracy when a single-phase earth fault and a latent fault occur in a power distribution network.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
according to a first aspect of the embodiments of the present invention, there is provided a fault location system for a distribution line, the system including: the device comprises a signal generating device, a plurality of partial discharge detection sensors and a control center;
the signal generating device is connected with the calibration interface of the partial discharge detection sensor and is used for injecting a first pulse signal into a distribution line to be detected, wherein a second pulse signal is generated when the distribution line is in fault;
the partial discharge detection sensors are sequentially installed along the distribution line in a segmented mode, one end of each partial discharge detection sensor is connected with one end of a coupling capacitor, the other end of each partial discharge detection sensor is grounded, and the partial discharge detection sensors are used for collecting analog voltage signals, first pulse signals and second pulse signals in the distribution line and transmitting the analog voltage signals, the first pulse signals and the second pulse signals to the control center in a communication mode;
and the control center is used for receiving, analyzing and processing the analog voltage signal, the first pulse signal and the second pulse signal, calculating and obtaining distance information and fault position information of the installation positions of two adjacent partial discharge detection sensors, and storing the distance information and the fault position information.
Further, the partial discharge detection sensor includes:
the signal acquisition module is used for acquiring and recording the analog voltage signal, the first pulse signal and the second pulse signal;
and the first communication module is used for transmitting the analog voltage signal, the first pulse signal and the second pulse signal to the control center.
Further, the control center includes:
the second communication module is used for transmitting the analog voltage signal, the first pulse signal and the second pulse signal with a partial discharge detection sensor;
the data analysis module is used for analyzing and processing the analog voltage signal, the first pulse signal and the second pulse signal to obtain the voltage amplitude and the phase of the power distribution line and the relative phase of the first pulse signal and the second pulse signal relative to the analog voltage signal;
the fault detection module is used for judging whether the distribution line has a fault according to the second pulse signal;
the fault positioning module is used for judging the section of the distribution line where the fault point is located according to the relative phase and calculating the distance between the fault point and the installation positions of two adjacent partial discharge detection sensors;
and the human-computer interaction module is used for displaying the operating condition of the distribution line and providing the user for inquiring the information of the distribution line.
Further, the calculating to obtain distance information of the mounting positions of two adjacent partial discharge detection sensors includes:
selecting the position of any one partial discharge detection sensor on the distribution line, and injecting a first pulse signal into the distribution line through a signal generating device;
all the partial discharge detection sensors detect the first pulse signals and transmit the detected first pulse signals to a control center;
the data analysis module analyzes the first pulse signal to obtain the relative phase of the first pulse signal detected by all the partial discharge detection sensors relative to the analog voltage signal;
the fault positioning module is used for acquiring the relative phase obtained by the partial discharge detection sensor at any position and the position adjacent to the any position, and recording the any position as a monitoring position k and the adjacent position as a monitoring position k + 1;
the fault location module calculates a relative phase difference between the monitored position k and the monitored position k +1
And a distance Lk(k+1)And storing said
And L(k+1)(k+2)：
Wherein the content of the first and second substances,
and
v is the relative phase at the monitoring position k and the monitoring position k +1, V is the propagation speed of the first pulse signal in the distribution line, and V is 3 x 108m/s (speed of light).
According to a second aspect of the embodiment of the present invention, a method for locating a fault of a distribution line is provided, where a system for locating a fault of a distribution line provided by the first aspect of the embodiment of the present invention is adopted, and the method includes:
monitoring a second pulse signal sent out at the fault point o by using a partial discharge detection sensor;
judging a fault line of the distribution line according to the second pulse signal by using the control center;
analyzing the second pulse signal by using a control center to obtain the minimum relative phase of the second pulse signal relative to the analog voltage signal of the distribution line
And corresponding detection position x, finding out adjacent monitoring positions y and z at two sides of the monitoring position x, and obtaining the relative phase of the second pulse signal at the monitoring positions y and z relative to the analog voltage signal
And
calculating the relative phase difference between the monitoring position x and the monitoring position y by using the control center
Relative phase difference of the monitoring position x and the monitoring position z
Wherein:
judging the section where the fault point o is located according to the relative phase difference by using the control center;
and calculating the distance between the fault point o and the monitoring positions at the two sides of the fault point o by using the control center according to the relative phase.
Further, the determining the faulty line of the distribution line by using the second pulse signal includes:
judging whether the control center receives the second pulse signal;
if the fault line is received, judging that the distribution line has a fault, and taking the line with the maximum amplitude of the second pulse signal in the distribution line as a fault line;
and if not, determining that the distribution line has no fault.
Further, the determining a section where the fault point o is located according to the relative phase difference includes:
inquiring the relative phase difference between the monitoring position x and the monitoring position y stored in the control center as
Relative phase difference of the monitoring position x and the monitoring position z
If it is
The fault point o is located between the monitoring position x and the monitoring position y;
if it is
The fault point o is located between the monitoring position x and the monitoring position z.
Further, the calculating the distance between the fault point o and the monitoring positions on the two sides of the fault point o by using a fault positioning module includes:
if the fault point o is located between the monitoring position x and the monitoring position y, inquiring the distance L between the monitoring position x and the monitoring position y stored by the control centerxyDistance L of said fault point o from said monitoring position xoxDistance L of fault point o from monitoring position yoyThe following equation is satisfied:
the distance of the fault point o from the position x can be calculated as:
the distance y from the fault point to the position is as follows:
Loy＝Lxy-Lox
if the fault point is positioned between the monitoring position x and the monitoring position z, inquiring the distance L between the monitoring position x and the monitoring position z stored by the control centerxzThe distance of the fault point from the control center position x and the control center position z satisfies the following equation:
the distance x from the fault point to the location can be calculated as:
the distance z from the fault point to the position is as follows:
Loz＝Lxz-Lox
wherein V is a propagation speed of the second pulse signal in the distribution line, and V is 3 × 108m/s (speed of light).
Based on the above embodiments, it can be seen that a complete set of fault location system is constructed by the fault location system and the method for the distribution line provided by the embodiments of the present invention. According to the invention, the pulse signal is injected into the distribution line to be detected through the signal generating device, the pulse signal is collected by using the partial discharge detection sensor, then the control center compares, analyzes and calculates the pulse signal and the analog voltage signal of the distribution line to obtain the distance between the installation positions of the two partial discharge detection sensors, and the accurate measurement of the distance between the installation positions of the partial discharge detection sensors is realized. And then, acquiring a second pulse signal generated when the distribution line has a single-phase earth fault and a latent fault by using the partial discharge detection sensor, and then, comparing, analyzing and calculating the second pulse signal and the analog voltage signal of the distribution line by using the control center to obtain a section of a fault point and the distance from the fault point to the installation positions of the partial discharge detection sensors on two sides. The method realizes online distance measurement by utilizing the phase generated by injecting the pulse signal, and has the characteristics of convenient operation and accurate distance measurement. The second pulse signal sent by the fault point has the characteristics of easiness in acquisition and online monitoring, so that the second pulse signal is utilized to realize fault positioning and has the characteristics of high positioning precision and high response speed. The invention shortens the troubleshooting time, greatly lightens the operation and maintenance burden of operation and maintenance personnel, and effectively improves the power supply reliability and the intelligent level of a power grid.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a fault location system of a distribution line according to an embodiment of the present invention;
fig. 2 is a flowchart of an online distance measuring method for a distribution line according to an embodiment of the present invention;
fig. 3 is a flowchart of a distribution line fault location method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an online distance measuring method for a distribution line according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a distribution line fault location method according to an embodiment of the present invention, where fig. (a), (b), and (c) are schematic diagrams of a fault location method when a fault point o is between a detection position x and a detection position y, and fig. (d), (e), and (f) are schematic diagrams of a fault location method when a fault point is between a detection position x and a detection position z.
Description of reference numerals:
FIG. 1: 1 is a distribution line, 2 is a coupling capacitor, 3 is a signal generating device, 4 is a partial discharge detection sensor and 5 is a control center;
FIG. 4:
to monitor the relative phase at position k,
To monitor the relative phase, L, at position k +1k(k+1)Is the distance between the monitoring position k and the monitoring position k + 1;
FIG. 5:
to monitor the relative phase at position x,
To monitor the relative phase at position y,
For monitoring the relative phase, L, at position zxyFor monitoring the distance, L, between the position x and the position yxzFor monitoring the distance, L, between the position x and the position zoxIs the distance, L, between the fault point o and the monitoring location xoyIs the distance, L, between the fault point o and the monitoring location yozIs the distance between the fault point o and the monitoring position z.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a schematic structural diagram of a fault location system for a distribution line according to an embodiment of the present invention, and as shown in fig. 1, the system includes a signal generation device 3, a plurality of partial discharge detection sensors 4, a control center 5, and a plurality of coupling capacitors 2. The partial discharge detection sensor 4 comprises a signal acquisition module and a first communication module, and the control center 5 comprises a second communication module, a data analysis module, a fault detection module, a fault positioning module and a man-machine interaction module.
Specifically, the signal generating device 3 is connected to a calibration interface of the partial discharge detection sensor 4, and is configured to inject a first pulse signal into the distribution line 1 to be measured, where a second pulse signal is generated when a latent fault such as a single-phase ground fault or an insulation fault occurs in the distribution line 1. Preferably, the signal generating device 3 is a commercially available pulse signal generating device, and the generated first pulse signal is a square wave pulse signal.
According to the specific conditions such as the regional position of distribution lines 1's place, natural environment, operating mode, partial discharge detection sensor 4 installs in proper order along distribution lines's generating line segmentation, for example, can the short distance segmentation in distribution lines district position, the environment is abominable, the operating mode is complicated, partial discharge detection sensor 4 installs relatively denseness promptly. When installing partial discharge detection sensor 4 on distribution lines 1's generating line, need install coupling capacitor 2 between distribution lines 1's generating line and partial discharge detection sensor 4, coupling capacitor 2 has the effect of separation high pressure and coupling signal, and coupling capacitor 2's configuration can realize that signal generation device 3 directly injects first pulse signal under distribution lines 1 electrified circumstances, and then realizes online range finding. The other end of the partial discharge detection sensor 4 is grounded to prevent high voltage electric shock. The partial discharge detection sensor 4 is used for acquiring an analog voltage signal in the distribution line 1, a first pulse signal injected by the signal generation device 3 and a second pulse signal generated when the distribution line 1 fails, and transmitting the analog voltage signal, the first pulse signal and the second pulse signal to the control center 5 in a communication manner. Further, the partial discharge detection sensor 4 comprises a signal acquisition module and a first communication module, wherein the signal acquisition module is used for acquiring and recording an analog voltage signal, a first pulse signal and a second pulse signal; the first communication module is used for transmitting the analog voltage signal, the first pulse signal and the second pulse signal to the control center 5.
And the control center 5 is used for receiving, analyzing and processing the analog voltage signal, the first pulse signal and the second pulse signal, calculating and obtaining distance information and fault position information of the installation positions of the two adjacent partial discharge detection sensors 4, and storing the distance information and the fault position information. Further, the control center 5 comprises a second communication module, a data analysis module, a fault detection module, a fault positioning module and a man-machine interaction module. The second communication module is configured to transmit an analog voltage signal, a first pulse signal, and a second pulse signal with the partial discharge detection sensor 4. The data analysis module carries out digital analysis on the waveform of the analog voltage signal to obtain a digital signal, and further obtains the voltage amplitude and the phase of the distribution line corresponding to the analog voltage signal; the data analysis module analyzes the first pulse signal and the second pulse signal, and obtains the relative phase of the first pulse signal and the second pulse signal relative to the analog voltage signal through comparison and analysis of the pulse signal and the analog voltage signal. And the fault detection module is used for judging whether the distribution line has a fault according to the second pulse signal, specifically, after the second communication module receives the second pulse signal and transmits the second pulse signal to the fault detection module, the fault detection module receives the second pulse signal and can judge that the distribution line 1 has a fault, and the line with the maximum amplitude of the second pulse signal is a fault phase. And the fault positioning module is used for judging the section of the distribution line 1 where the fault point is located according to the relative phase and calculating the distance between the fault point and the installation positions of the two adjacent partial discharge detection sensors 4. And the human-computer interaction module is used for displaying the running condition of the distribution line 1 and providing the user for inquiring the information of the distribution line 1.
Further, the distance information of the mounting positions of the two adjacent partial discharge detection sensors 4 is obtained through calculation, that is, the distance information of the mounting positions of the two adjacent partial discharge detection sensors 4 is obtained through calculation by using a distribution line online distance measurement method. Fig. 2 is a flowchart of a distribution line online distance measurement method according to an embodiment of the present invention, and fig. 4 is a schematic diagram of a distribution line online distance measurement method according to an embodiment of the present invention, as shown in fig. 2 and fig. 4, the online distance measurement method specifically includes the following steps:
s101, selecting the position of any partial discharge detection sensor 4 on the distribution line 1, and injecting a first pulse signal into the distribution line 1 through the signal generating device 3.
S102 all the partial discharge detection sensors 4 detect the first pulse signal and transmit the detected first pulse signal to the control center 5.
S103, the data analysis module analyzes the first pulse signal to obtain the relative phase of the first pulse signal detected by all the partial discharge detection sensors 4 with respect to the analog voltage signal.
S104 the fault location module takes the relative phase obtained by the partial discharge detection sensor 4 at any position and the adjacent position of any position, and records that any position is a monitoring position k and the adjacent position is a monitoring position k + 1.
S105, the fault positioning module calculates the relative phase difference between the monitoring position k and the monitoring position k +1
And a distance Lk(k+1)And store
And L(k+1)(k+2)：
Wherein the content of the first and second substances,
and
in order to monitor the relative phase at the position k and the position k +1, V is the propagation speed of the first pulse signal in the distribution line, and V is 3 × 108m/s (speed of light).
Based on the above implementation principle, the fault location method provided by the present embodiment will be described in detail below with reference to the accompanying drawings. Fig. 3 is a flowchart of a distribution line fault location method according to an embodiment of the present invention; fig. 5 is a schematic diagram of a distribution line fault location method according to an embodiment of the present invention, where fig. (a), (b), and (c) are schematic diagrams of a fault location method when a fault point o is between a detection position x and a detection position y, and fig. (d), (e), and (f) are schematic diagrams of a fault location method when a fault point is between a detection position x and a detection position z. As shown in fig. 3 and fig. 5, with the distribution line fault location system provided by the embodiment of the present invention, the fault location method includes the following steps:
s201 monitors the second pulse signal emitted at the fault point o using the partial discharge detection sensor.
When the distribution line has a latent fault such as a single-phase earth fault or an insulation fault, a pulse signal is generated at the fault point o, and the signal is named as a second pulse signal for distinguishing the signal sent by the signal generator. All the partial discharge detection sensors installed on the distribution line monitor the second pulse signal emitted from the fault point o and transmit the detected second pulse signal to the control center.
And S202, judging a fault line of the distribution line by using the second pulse signal.
When the distribution line has single-phase earth fault or insulation fault latency, a second pulse signal is generated at a fault point o, and the second pulse signal is monitored by the partial discharge detection sensor and is sent to the control center. Therefore, whether the distribution line has a fault or not and the line where the fault is located can be obtained by judging whether the control center receives the second pulse signal or not. Specifically, a fault monitoring module of the control center judges whether the control center receives a second pulse signal; if the fault is received, the fault of the distribution line is judged, and the line with the maximum amplitude of the second pulse signal in the distribution line is used as the fault line; and if not, determining that the distribution line has no fault.
S203, the control center is used for analyzing the second pulse signal to obtain the minimum relative phase of the second pulse signal relative to the analog voltage signal of the distribution line
And corresponding detection position x, finding out adjacent monitoring positions y and z at two sides of the monitoring position x, and obtaining the relative phase of the second pulse signal at the monitoring positions y and z relative to the analog voltage signal
And
when the distribution line has single-phase earth fault or insulation fault or other latency, the partial discharge detection sensors installed at different positions monitor a second pulse signal. Because the installation positions of the partial discharge detection sensors are different relative to the position of the fault point o, the relative phases of the second pulse signals monitored by each partial discharge detection sensor installed on the fault line relative to the analog voltage signals of the distribution line are different, and then the control center receives the second pulse signals and has different relative phases, and the different relative phases correspond to the monitoring positions of the partial discharge detection sensors one by one. According to the definition and the characteristics of the phase, the relative phase of the second pulse signal monitored by the partial discharge detection sensor at the position closest to the fault point o is the minimum, and the rough position of the fault point o can be preliminarily judged according to the characteristic. Specifically, all the received pulse signals are analyzed by the data analysis module of the control center, and the second pulse signal is compared with the analog voltage signal and analyzed (as shown in fig. 5(b)), so as to obtain the second pulse signalThe relative phase of the two pulse signals with respect to the analog voltage signal. Obtaining the minimum relative phase of the second pulse signal by utilizing a fault positioning module of a control center
And the corresponding detection position x where the partial discharge detection sensor is positioned, finding out the adjacent monitoring positions y and z at the two sides of the monitoring position x, and obtaining the relative phases of the second pulse signals at the monitoring positions y and z relative to the analog voltage signal
And
s204, calculating the relative phase difference between the monitoring position x and the monitoring position y
Relative phase difference between monitoring position x and monitoring position z
Wherein:
the relative phases of the monitor position x, the monitor position y, and the monitor position z are obtained in step S203
And
then, the fault positioning module of the control center locates the fault according to the relative phase
And
calculate and obtain the monitorRelative phase difference between measuring position x and monitoring position y
Relative phase difference between monitoring position x and monitoring position z
Wherein:
s205, the control center is used for judging the section where the fault point o is located according to the relative phase difference.
According to the contents of the other parts of the embodiment, the control center obtains and stores the relative phase difference between the monitoring positions where each of the adjacent partial discharge detection sensors is installed, which is obtained by injecting the first pulse signal under the normal condition of the distribution line. When a fault occurs, the control center obtains the relative phase difference at the fault point o according to a second pulse signal sent by the fault point o. Depending on the characteristics of the phase difference, the section in which the fault point o is located will get a relative phase difference different from the stored corresponding section. Therefore, the position section where the fault point o is located can be determined by comparing the relative phase differences respectively corresponding to the second pulse signal and the first pulse signal. Specifically, the relative phase difference between the monitoring position x and the monitoring position y stored in the query control center is
Relative phase difference between monitoring position x and monitoring position z
If it is
The fault point o is located between the monitoring position x and the monitoring position y; if it is
The fault point o is located at the monitoring position x andbetween the monitoring positions z.
S206, the control center is used for calculating the distance between the fault point o and the monitoring positions on the two sides of the fault point o according to the relative phase.
After the step S205 determines to obtain the section of the location section where the fault point o is located, the fault location module of the control center obtains the relative phases of the section of the location section where the fault point o is located and the monitoring position x, the monitoring position y, and the monitoring position z
And
the specific location of the fault point o is obtained by further analytical calculations.
Specifically, if the fault point o is located between the monitoring position x and the monitoring position y, the distance L between the monitoring position x and the monitoring position y stored in the control center is queriedxyDistance L of said fault point o from said monitoring position xoxDistance L of fault point o from monitoring position yoyThe following equation is satisfied:
the distance of the fault point o from the position x can be calculated as:
the distance y from the fault point to the position is as follows:
Loy＝Lxy-Lox
if the fault point is located between the monitoring position x and the monitoring position z, inquiring the distance L between the monitoring position x and the monitoring position z stored in the control centerxzThe distance of the fault point from the control center position x and the control center position z satisfies the following equation:
the distance x from the fault point to the location can be calculated as:
the distance z from the fault point to the position is as follows:
Loz＝Lxz-Lox
wherein V is the propagation speed of the second pulse signal in the distribution line, and V is 3 × 108m/s (speed of light).
The embodiments in this specification are described in a progressive manner. Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It should be noted that, unless otherwise specified and limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, mechanically or electrically connected, or may be communicated between two elements, directly or indirectly through an intermediate medium, and specific meanings of the terms may be understood by those skilled in the relevant art according to specific situations. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of additional like elements in the article or device comprising the element. Relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. A fault location system of a distribution line is characterized by comprising a signal generation device (3), a plurality of partial discharge detection sensors (4) and a control center (5);
the signal generating device (3) is connected with a calibration interface of the partial discharge detection sensor (4) and is used for injecting a first pulse signal into the distribution line (1) to be detected, wherein a second pulse signal is generated when the distribution line (1) is in fault;
the partial discharge detection sensors (4) are sequentially installed along the distribution line (1) in a segmented manner, one end of each partial discharge detection sensor is connected with one end of the coupling capacitor (2), the other end of each partial discharge detection sensor is grounded, and the partial discharge detection sensors are used for acquiring an analog voltage signal, the first pulse signal and the second pulse signal in the distribution line (1) and transmitting the analog voltage signal, the first pulse signal and the second pulse signal to the control center (5) in a communication manner;
the control center (5) is used for receiving, analyzing and processing the analog voltage signal, the first pulse signal and the second pulse signal, calculating and obtaining distance information and fault position information of the installation positions of two adjacent partial discharge detection sensors (4), and storing the distance information and the fault position information.
2. Fault localization system of a distribution line according to claim 1, characterized in that the partial discharge detection sensor (4) comprises:
the signal acquisition module is used for acquiring and recording the analog voltage signal, the first pulse signal and the second pulse signal;
the first communication module is used for transmitting the analog voltage signal, the first pulse signal and the second pulse signal to the control center (5).
3. Fault localization system of a distribution line according to claim 1, characterized in that the control center (5) comprises:
the second communication module is used for transmitting the analog voltage signal, the first pulse signal and the second pulse signal with a partial discharge detection sensor (4);
the data analysis module is used for analyzing and processing the analog voltage signal, the first pulse signal and the second pulse signal to obtain the voltage amplitude and the phase of the power distribution line (1) and the relative phase of the first pulse signal and the second pulse signal relative to the analog voltage signal;
the fault detection module is used for judging whether the distribution line (1) has a fault according to the second pulse signal;
the fault positioning module is used for judging the section of the distribution line (1) where a fault point is located according to the relative phase, and calculating the distance between the fault point and the installation positions of two adjacent partial discharge detection sensors (4);
and the human-computer interaction module is used for displaying the running state of the distribution line (1) and providing the user for inquiring the information of the distribution line (1).
4. The fault location system for distribution lines according to claim 3, wherein the calculating to obtain distance information of the installation positions of two adjacent partial discharge detection sensors (4) comprises:
selecting the position of any one partial discharge detection sensor (4) on the distribution line (1), and injecting a first pulse signal into the distribution line (1) through a signal generating device (3);
all the partial discharge detection sensors (4) detect the first pulse signals and transmit the detected first pulse signals to a control center (5);
the data analysis module analyzes the first pulse signals to obtain the relative phase of the first pulse signals detected by all the partial discharge detection sensors (4) relative to the analog voltage signals;
the fault positioning module takes the relative phase obtained by the partial discharge detection sensor (4) at any position and the position adjacent to the any position, and records that the any position is a monitoring position k and the adjacent position is a monitoring position k + 1;
the fault location module calculates a relative phase difference between the monitored position k and the monitored position k +1
And a distance Lk(k+1)And storing said
And L(k+1)(k+2)：
Wherein the content of the first and second substances,
and
for the relative phases at the monitoring position k and the monitoring position k +1, V is the propagation speed of the first pulse signal in the distribution line (1), V3 x 108m/s (speed of light).
5. A method for locating a fault of a distribution line, which employs the fault locating system of the distribution line according to any one of claims 1 to 4, the method comprising:
monitoring a second pulse signal sent out at the fault point o by using a partial discharge detection sensor;
judging a fault line of the distribution line according to the second pulse signal by using a control center;
analyzing the second pulse signal by using a control center to obtain the minimum relative phase of the second pulse signal relative to the analog voltage signal of the distribution line
And corresponding detection position x, finding out adjacent monitoring positions y and z at two sides of the monitoring position x, and obtaining the relative phase of the second pulse signal at the monitoring positions y and z relative to the analog voltage signal
And
calculating the relative phase difference between the monitoring position x and the monitoring position y by using the control center
Relative phase difference of the monitoring position x and the monitoring position z
Wherein:
judging the section where the fault point o is located according to the relative phase difference by using the control center;
and calculating the distance between the fault point o and the monitoring positions at the two sides of the fault point o by using the control center according to the relative phase.
6. The method of claim 5, wherein the determining the faulty line of the distribution line using the second pulse signal comprises:
judging whether the control center receives the second pulse signal;
if the fault line is received, judging that the distribution line has a fault, and taking the line with the maximum amplitude of the second pulse signal in the distribution line as a fault line;
and if not, determining that the distribution line has no fault.
7. The method of claim 5, wherein the determining the section of the fault point o according to the relative phase difference comprises:
inquiring the relative phase difference between the monitoring position x and the monitoring position y stored in the control center as
Relative phase difference of the monitoring position x and the monitoring position z
If it is
The fault point o is located between the monitoring position x and the monitoring position y;
if it is
The fault point o is located at the monitoring position x and the stationBetween said monitoring positions z.
8. The method of claim 7, wherein the calculating the distance between the fault point o and the monitoring positions on two sides of the fault point o by using the fault location module comprises:
if the fault point o is located between the monitoring position x and the monitoring position y, inquiring the distance L between the monitoring position x and the monitoring position y stored by the control centerxyDistance L of said fault point o from said monitoring position xoxDistance L of fault point o from monitoring position yoyThe following equation is satisfied:
the distance of the fault point o from the position x can be calculated as:
the distance y from the fault point to the position is as follows:
Loy＝Lxy-Lox
if the fault point is positioned between the monitoring position x and the monitoring position z, inquiring the distance L between the monitoring position x and the monitoring position z stored by the control centerxzThe distance of the fault point from the control center position x and the control center position z satisfies the following equation:
the distance x from the fault point to the location can be calculated as:
the distance z from the fault point to the position is as follows:
Loz＝Lxz-Lox
wherein V is a propagation speed of the second pulse signal in the distribution line, and V is 3 × 108m/s (speed of light).
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