CN113253057A - Automatic fault finding method for overhead transmission line - Google Patents
Automatic fault finding method for overhead transmission line Download PDFInfo
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- CN113253057A CN113253057A CN202110684766.6A CN202110684766A CN113253057A CN 113253057 A CN113253057 A CN 113253057A CN 202110684766 A CN202110684766 A CN 202110684766A CN 113253057 A CN113253057 A CN 113253057A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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Abstract
The invention relates to an automatic fault searching method for an overhead transmission line, which comprises the following steps: s1, labeling each detection block of the line to be detected; s2, each detection block carries out parameter acquisition on the line to be detected; and S3, the signal emitter sends the signal information acquired by the corresponding detection block to the central control module, and the central control module performs data integration and analyzes whether the electric wire to be detected has a fault and a fault point of existence. According to the invention, the detection block is used for collecting the power data of each wire pole, and the power data is fed back to the power station in a wireless transmission manner, so that the power condition of the line responsible for the power station is monitored in real time, when the power problem occurs, the power station can find the power data in the fastest time, the time for personnel inspection is reduced, the power supply level is greatly improved, and meanwhile, a foundation is laid for the maintenance of a power system.
Description
Technical Field
The invention relates to the technical field of overhead wire detection, in particular to an automatic fault finding method for an overhead transmission line.
Background
With the improvement demand of the power grid system, higher requirements are put on the erection of the power system. The overhead transmission line is exposed in the open air for a long time and continuously bears the gifts of various severe environments of the nature for a long time, and particularly the electric power consumption in the peak in summer can cause hidden danger damage which is difficult to predict and has different degrees to the electrical equipment. Overhead transmission line's the erection, overhead distribution line from the transformer substation, accesss to each power utilization place, generally is arborescent distributary, includes: the trunk line, the branch line and the sub-branch line on the branch line, until finally reaching the distribution transformer.
The prior art needs technical staff to manually detect the fault condition of the overhead distribution line, the time for finding a problem point is long through manual detection of the technical staff, the problem is easy to make mistakes, the problem can not be well found and solved, the electric power recovery time is prolonged, and the timeliness is poor.
Disclosure of Invention
Therefore, the invention provides an automatic fault finding method and system for an overhead power transmission line, which are used for solving the problem that in the prior art, technicians manually detect the fault condition of the overhead power transmission line, so that the real-time performance of fault detection is poor.
In order to achieve the above object, the present invention provides an automatic fault finding method for an overhead transmission line, comprising,
s1, marking each detection block of the line to be detected, wherein N stringing poles are shared from a power station to a receiving point, and the detection blocks are marked as a first detection block, a second detection block and a … Nth detection block according to the sequence of gradually departing from the power station;
s2, each detection block carries out parameter acquisition on the line to be detected, and each detection block is respectively provided with a signal emitter corresponding to the detection block;
s3, a central control module is arranged at a power station at the power output end, the signal emitter sends signal information acquired by the corresponding detection block to the central control module, and the central control module performs data integration and analyzes whether a fault exists in the wire to be detected;
in S2, the data set detected by the ith detection block is Ai, and Ai includes a parameter Bi, a parameter Ci and a parameter Di, i =1,2,3,4 … N, N is a natural number greater than 0, where Bi is a current parameter at the detection point of the ith detection block, Ci is a wire temperature parameter at the detection point of the ith detection block, Di is a voltage parameter between the ith detection block and the ith-1 detection block, and when i =1, Di is a voltage parameter between the first detection block and the power station;
the acquisition interval duration of parameter acquisition of the line to be detected by each detection block is T1, when the line to be detected passes through T1, the line to be detected is subjected to a new round of parameter acquisition by each detection block, the data set detected by the ith detection block in the new round is Ai ', Ai' comprises parameters Bi ', Ci' and Di ', wherein Bi' is a current parameter of the detection point of the ith detection block after the acquisition interval duration T1, Ci 'is a temperature parameter of a wire at the detection point of the ith detection block after the acquisition interval duration T1, and Di' is a voltage parameter between the ith detection block and the ith-1 detection block after the acquisition interval duration T1;
and when the central control module judges that the fault exists in the electric wire to be detected, the central control module judges according to the data of each detection block to determine the position of the fault existence point.
Further, when the central control module performs data integration, the central control module collects current parameters of all acquisition points to generate a current parameter group B0, where B0 includes a parameter B1, a parameter B2, and a parameter … Bi … parameter BN, where B1 is a current parameter of a first detection block detection point, B2 is a current parameter … Bi of a second detection block detection point, and B … BN is a current parameter of an ith detection block detection point;
the central control module collects the electric wire temperature parameters of all the acquisition points to generate an electric wire temperature parameter group C0, C0 comprises a parameter C1, a parameter C2 and a parameter …, namely a parameter Ci …, wherein C1 is the electric wire temperature parameter at the detection point of the first detection block, C2 is the electric wire temperature parameter at the detection point of the second detection block, Ci is the electric wire temperature parameter at the detection point of the ith detection block, and Cn is the electric wire temperature parameter at the detection point of the Nth detection block;
the central control module collects voltage parameters of all acquisition points to generate a voltage parameter group D0, D0 comprises a parameter D1, a parameter D2 and a parameter … parameter Di … parameter DN, wherein D1 is a voltage parameter between the first detection block and a power station, D2 is a voltage parameter between the second detection block and the first detection block, … Di is a voltage parameter between the ith detection block and the i-1 th detection block, and … Dn is a voltage parameter between the Nth detection block and the N-1 th detection block.
Furthermore, a first preset current standard value Bb1 and a second preset current standard value Bb2 are arranged in the central control module, the central control module compares each item of data in the current parameter group B0 with the first preset current standard value Bb1 and the second preset current standard value Bb2 one by one,
and when the parameter Bi stored in the current parameter group B0 is not in the range of Bb 1-Bb 2, the central control module judges that the line to be detected has a fault.
Further, when Bi > Bb2 exists in the current parameter group B0, and Di is approximately equal to 0, the central control module judges that the short circuit phenomenon exists in the detection wire;
when Bi < Bb1 exists in the current parameter group B0, the central control module judges that the detection wire is broken;
when Bi ≈ 0 is stored in the current parameter group B0 and Di = D1, the central control module determines that the open circuit exists in the detection wire.
Further, when the central control module determines that the short circuit phenomenon exists in the detection wire, the central control module analyzes the current parameter group B0 to find a short circuit point,
when Bj is approximately equal to Bi and Bj +1 ≪ Bj exists, the central control module determines that a short-circuit point is between the j-th detection block and the j + 1-th detection block;
and when BN is approximately equal to Bi, the central control module judges that a short-circuit point is between the Nth detection block and the receiving power transformer.
Further, when the central control module determines that the detection wire is damaged, the central control module makes a difference between the wire temperature parameter set C0 and all the data parameters in the wire temperature parameter set C0' of the collection interval duration T1 one by one,
△C1=C1’- C1，△C2=C2’- C2，△C3=C3’- C3，…△CN=CN’- CN;
the central control module selects the maximum value delta Cj from the difference values, compares the values of delta Cj +1 and delta Cj-1,
when the delta Cj +1 is > -the delta Cj-1, the central control module judges that a breakage point is between the j detection block and the j +1 detection block;
when the delta Cj +1 is smaller than the delta Cj-1, the central control module judges that the breakage point is between the j-1 detection block and the j detection block.
Further, when the central control module determines that the breakage point is between the j-1 detection block and the j-1 detection block, the central control module calculates a ratio Q between Δ Cj and Δ Cj-1, Q =Δcj/Δ Cj-1, a distance parameter L between the j-1 detection block and the j-1 detection block is arranged in the central control module, the central control module calculates an approximate distance Lz between the breakage point and the j-detection block through the ratio Q, and Lz = L × (Q-1) × Q, wherein Q is a compensation parameter of the ratio Q to the distance Lz, and similarly, when the central control module determines that the breakage point is between the j-detection block and the j +1 detection block, the breakage point position is calculated according to the same method.
Further, when the central control module determines that the detection wire has an open circuit, the central control module analyzes the voltage parameter group D0, and when Dj = D1 and Dj +1 ≈ 0 is stored, the central control module determines that the open circuit point is between the j-th detection block and the j + 1-th detection block.
An automatic fault finding system of the overhead transmission line, which is applied to the automatic fault finding method of the overhead transmission line, comprises,
the detection block is arranged on the wire to be detected and used for detecting various parameters of the wire, and one detection block is arranged on each wire erecting rod of the same wire to be detected;
the signal emitter is connected with the detection block and used for generating data information collected by the detection block, and one signal emitter is arranged on each stringing pole;
the base station is wirelessly connected with the signal transmitter and is used for receiving the data information transmitted by the signal transmitter; the base station is internally provided with a central control module and a storage module, the central control module is used for analyzing the data information collected by the detection block, and the storage module is used for storing the data information collected by the detection block.
Furthermore, a solar cell panel is arranged on the detection block and used for providing energy for the detection block and the signal transmitter.
Compared with the prior art, the method has the advantages that each detection block carries out parameter acquisition on the line to be detected, the data set detected by the ith detection block is Ai, Ai (Bi, Ci, Di), i =1,2,3 and 4 … N, wherein Bi is a current parameter of a detection point of the ith detection block, Ci is a temperature parameter of an electric wire at the detection point of the ith detection block, Di is a voltage parameter between the ith detection block and the ith-1 detection block, and Di is a voltage parameter between the first detection block and the electric wire when i = 1; when the central control module performs data integration, the central control module collects current parameters of all collection points to generate current parameter groups B0 and B0 (B1, B2 and … Bi … BN), the central control module collects wire temperature parameters of all collection points to generate wire temperature parameter groups C0 and C0 (C1, C2 and … Ci … CN), and the central control module collects voltage parameters of all collection points to generate voltage parameter groups D0 and D0 (D1, D2 and … Di … DN); the central control module is internally provided with a first preset current standard value Bb1 and a second preset current standard value Bb2, the central control module compares various data in a current parameter group B0 with the first preset current standard value Bb1 and the second preset current standard value Bb2 one by one, acquires power data of each wire pole through the detection block, and feeds the power data back to the power station in a wireless transmission mode, the power station is monitored in real time for the power condition of a line, when the power problem occurs, the power station can find the power station in the fastest time, the time for personnel inspection is reduced, the power supply level is greatly improved, and meanwhile, a foundation is laid for the maintenance of a power system.
Particularly, when Bi > Bb2 exists in the current parameter group B0 and Di is approximately equal to 0, the central control module judges that the short-circuit phenomenon exists in the detection wire; when Bi < Bb1 exists in the current parameter group B0, the central control module judges that the detection wire is broken; when Bi ≈ 0 is stored in the current parameter group B0 and Di = D1, the central control module determines that the open circuit exists in the detection wire. Whether a line fault exists in the checked line or not is judged by judging the specific numerical value of the current, and circuit data are fed back in real time, so that the power station can find the line fault in the fastest time when the power problem occurs, and particularly, when the current value in the circuit is larger than a preset value and the voltage is almost zero, the short circuit phenomenon of the line to be detected can be judged; when the current value in the circuit is smaller than the preset value, the resistance in the circuit can be judged to be increased, and the resistance in the overhead circuit is likely to be increased because the line is damaged, so that a certain point of the electric wire becomes thin; when the current value is almost zero and the voltage value is close to the initial value, the circuit is judged to be broken; through monitoring the current condition, the problem in the circuit is accurately judged, and the type of the problem is accurately judged, so that the time for personnel to check is further shortened, the power supply level is greatly improved, and a foundation is laid for the maintenance of the power system.
In particular, when the central control module determines that the short-circuit phenomenon exists in the detection electric wire, the central control module analyzes the current parameter group B0 to find a short-circuit point, and when Bj ≈ Bi and Bj +1 ≪ Bj exist, the central control module determines that the short-circuit point is between the jth detection block and the jth +1 detection block; when a short circuit occurs in a circuit, the current value of the circuit of the short circuit section is increased, the current of the circuit outside the short circuit section approaches to zero, namely, the current value detected by the detection block before the short circuit point is larger than the normal current value, the current value detected by the detection block after the short circuit point approaches to zero, and the position of the short circuit point can be quickly determined by searching two detection blocks with sudden change of the current value, so that the time for personnel to check is further shortened, the power supply level is greatly improved, and a foundation is laid for the maintenance of an electric power system.
In particular, when the central control module determines that the detection wire is broken, the central control module performs a subtraction on all data parameters in the wire temperature parameter group C0 and the wire temperature parameter group C0' of the collection interval duration T1 one by one. The central control module selects a maximum value delta Cj from the difference values, compares the values of delta Cj +1 and delta Cj-1, when a circuit to be detected is damaged, the resistance value is increased, the overall temperature of the circuit is raised, meanwhile, the damaged point is thinned due to the circuit, the temperature change value is larger than the temperature change values of other positions, the position of the detection block with the closest damaged point is determined by calculating the difference value of the temperature change values detected by all the detection blocks, meanwhile, the specific interval position of the damaged point is determined by comparing the temperature values of the detection blocks at the two ends of the detection block with the closest damaged point, the time for personnel to check is further reduced, the power supply level is greatly improved, and a foundation is laid for the maintenance of a power system.
Particularly, when the central control module judges that a damaged point is between the j-1 detection block and the j detection block, the central control module calculates a ratio Q between delta Cj and delta Cj-1, a distance parameter L between the j-1 detection block and the j detection block is arranged in the central control module, the central control module calculates an approximate distance Lz between the damaged point and the j detection block according to the ratio Q, the damage and the incomplete fracture in a power supply line are the most difficult to be found in the conventional line detection, the damaged point is very serious in the existing detection technology, and even the circuit problem can be found after the fracture, the invention can find the damaged point by detecting the temperature and the current of the power transmission line, prevent the line from being interrupted to cause the breakpoint loss, and the damaged condition and the position are determined in advance by carrying out data analysis on the detection line, thereby greatly improving the power supply level, and the foundation is laid for the maintenance of the power system. Particularly, the approximate range of the damage point is determined by calculating the temperature ratio of the two ends of the damage point, so that the manual detection time is further shortened, the power supply level is greatly improved, and a foundation is laid for the maintenance of the power system.
In particular, when the central control module determines that there is an open circuit of the detection wire, the central control module analyzes the voltage parameter set D0, and when Dj = D1 and Dj +1 ≈ 0 is stored, the central control module determines that the open circuit point is between the j-th detection block and the j + 1-th detection block. When the circuit to be detected is broken, the voltage is stored in the broken section, the next detection point of the broken point has no voltage input, namely, the voltage does not exist, and the position of the broken point can be quickly determined by searching the two detection blocks with sudden change of the voltage value, so that the time for personnel to check is further reduced, the power supply level is greatly improved, and a foundation is laid for the maintenance of the power system.
Furthermore, a solar cell panel is arranged on the detection block and used for providing energy for the detection block and the signal transmitter. The detection block is powered by solar energy, so that data transmission can be still carried out when the line to be detected fails, and the timeliness of data transmission is guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of an automatic fault finding system for an overhead transmission line according to the present invention;
fig. 2 is a flowchart of an automatic fault finding method for an overhead transmission line according to the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, which is a schematic structural diagram of an automatic fault finding system for an overhead transmission line according to the present invention, the present invention discloses an automatic fault finding system for an overhead transmission line, including,
the detection block 1 is arranged on the wire to be detected and used for detecting various parameters of the wire, and one detection block 1 is arranged on each wire erecting rod of the same wire to be detected;
the signal emitter 2 is connected with the detection block 1 and used for generating data information collected by the detection block, and one signal emitter 2 is arranged on each stringing pole;
a base station 3, which is arranged in the power generation station and is wirelessly connected with the signal transmitter 2, and is used for receiving the data information transmitted by the signal transmitter 2; a central control module 31 and a storage module 32 are arranged in the base station 3, the central control module 31 is used for analyzing the data information collected by the detection block 1, and the storage module 32 is used for storing the data information collected by the detection block 1.
The detection block 2 is provided with a solar cell panel 4, and the solar cell panel 4 is used for providing energy for the detection block 1 and the signal emitter 2.
The detection block is powered by solar energy, so that data transmission can be still carried out when the line to be detected fails, and the timeliness of data transmission is guaranteed.
Referring to fig. 2, which is a flowchart of an automatic fault finding method for an overhead transmission line according to the present invention, the present invention discloses an automatic fault finding method for an overhead transmission line, including:
s1, labeling each detection block of a line to be detected, wherein N stringing poles are shared by the detection blocks sent from a power station to a receiving point, and the detection blocks are labeled as a first detection block, a second detection block, a third detection block and an Nth detection block according to the sequence of gradually departing from the power station;
s2, each detection block carries out parameter acquisition on the line to be detected, the data set detected by the ith detection block is Ai, Ai (Bi, Ci, Di), i =1,2,3,4 … N, wherein Bi is a current parameter of a detection point of the ith detection block, Ci is a wire temperature parameter of the detection point of the ith detection block, Di is a voltage parameter between the ith detection block and the ith-1 detection block, and Di is a voltage parameter between the first detection block and the power station when i = 1;
and S3, the signal emitter sends the signal information acquired by the corresponding detection block to the central control module, and the central control module performs data integration and analyzes whether the electric wire to be detected has a fault and the fault point of existence.
In S2, the acquisition interval duration of parameter acquisition performed by each detection block on the line to be detected is T1, when the line passes through T1, each detection block performs a new round of parameter acquisition on the line to be detected, and the data set detected by the ith detection block in the new round is Ai ', Ai ' (Bi ', Ci ', Di ');
specifically, when the central control module performs data integration, the central control module collects current parameters of all collection points to generate current parameter groups B0 and B0 (B1, B2 and … Bi … BN), the central control module collects wire temperature parameters of all collection points to generate wire temperature parameter groups C0 and C0 (C1, C2 and … Ci … CN), and the central control module collects voltage parameters of all collection points to generate voltage parameter groups D0 and D0 (D1, D2 and … Di … DN);
specifically, a first preset current standard value Bb1 and a second preset current standard value Bb2 are provided in the central control module, the central control module compares each item of data in the current parameter set B0 with the first preset current standard value Bb1 and the second preset current standard value Bb2 one by one,
and when the parameter Bi stored in the current parameter group B0 is not in the range of Bb 1-Bb 2, the central control module judges that the line to be detected has a fault.
The electric power data of each line pole is gathered through detecting the piece to with electric power data through the form feedback to the power station of wireless conveying, the real-time supervision power station is responsible for the electric power condition of circuit, when electric power problem appeared, the power station can be with the fastest time discovery, has reduced the personnel and has examined the used time, has improved the power supply level greatly, simultaneously, lays the foundation for power system's maintenance.
Specifically, when Bi > Bb2 exists in the current parameter group B0 and Di is approximately equal to 0, the central control module judges that the short-circuit phenomenon exists in the detection electric wire;
when Bi < Bb1 exists in the current parameter group B0, the central control module judges that the detection wire is broken;
when Bi ≈ 0 is stored in the current parameter group B0 and Di = D1, the central control module determines that the open circuit exists in the detection wire.
Whether a line fault exists in the checked line or not is judged by judging the specific numerical value of the current, and circuit data are fed back in real time, so that the power station can find the line fault in the fastest time when the power problem occurs, and particularly, when the current value in the circuit is larger than a preset value and the voltage is almost zero, the short circuit phenomenon of the line to be detected can be judged; when the current value in the circuit is smaller than the preset value, the resistance in the circuit can be judged to be increased, and the resistance in the overhead circuit is likely to be increased because the line is damaged, so that a certain point of the electric wire becomes thin; when the current value is almost zero and the voltage value is close to the initial value, the circuit is judged to be broken; through monitoring the current condition, the problem in the circuit is accurately judged, and the type of the problem is accurately judged, so that the time for personnel to check is further shortened, the power supply level is greatly improved, and a foundation is laid for the maintenance of the power system.
Specifically, when the central control module determines that the short circuit phenomenon exists in the detection wire, the central control module analyzes the current parameter group B0 to find a short circuit point,
when Bj is approximately equal to Bi and Bj +1 ≪ Bj exists, the central control module determines that a short-circuit point is between the j-th detection block and the j + 1-th detection block;
and when BN is approximately equal to Bi, the central control module judges that a short-circuit point is between the Nth detection block and the receiving power transformer.
When a short circuit occurs in a circuit, the current value of the circuit of the short circuit section is increased, the current of the circuit outside the short circuit section approaches to zero, namely, the current value detected by the detection block before the short circuit point is larger than the normal current value, the current value detected by the detection block after the short circuit point approaches to zero, and the position of the short circuit point can be quickly determined by searching two detection blocks with sudden change of the current value, so that the time for personnel to check is further shortened, the power supply level is greatly improved, and a foundation is laid for the maintenance of an electric power system.
Specifically, when the central control module determines that the detection wire is damaged, the central control module performs subtraction on all data parameters in the wire temperature parameter group C0 and the wire temperature parameter group C0' of the collection interval duration T1 one by one.
Specifically, Δ C1= C1 '-C1, Δ C2= C2' -C2, Δ C3= C3 '-C3, … Δ CN = CN' -CN;
the central control module selects the maximum value delta Cj from the difference values, compares the values of delta Cj +1 and delta Cj-1,
when the delta Cj +1 is > -the delta Cj-1, the central control module judges that a breakage point is between the j detection block and the j +1 detection block;
when the delta Cj +1 is smaller than the delta Cj-1, the central control module judges that the breakage point is between the j-1 detection block and the j detection block.
When waiting to detect and appear when damaged in the circuit, the resistance value grow, the whole temperature of circuit can promote, and simultaneously, the damaged point becomes thin because of the circuit, the temperature variation value can be greater than the temperature variation value of other positions, through calculating the difference of the temperature variation value that all detection piece detected, confirm the detection piece position that the damaged point is closest, and simultaneously, through the temperature value that the detection piece both ends that contrast the damaged point is closest detect the piece, confirm the specific interval position of damaged point, personnel's inspection time has further been reduced, the power supply level has been improved greatly, lay the basis for power system's maintenance.
Specifically, when the central control module judges that a damaged point is between a j-1 detection block and a j detection block, the central control module calculates a ratio Q of delta Cj to delta Cj-1, Q =deltacj/[ delta ] Cj-1, a distance parameter L between the j-1 detection block and the j detection block is arranged in the central control module, the central control module calculates an approximate distance Lz between the damaged point and the j detection block through the ratio Q, and Lz = L x (Q-1) xq, wherein Q is a compensation parameter of the ratio Q to the distance Lz;
similarly, when the central control module judges that the damaged point is between the jth detection block and the jth +1 detection block, the position of the damaged point is calculated according to the same method.
The invention can detect the temperature and the current of the power transmission line, can find the damaged point, prevent the breakpoint loss caused by the line interruption, determine the damaged condition and position in advance by analyzing the data of the detection line, greatly improve the power supply level and lay a foundation for the maintenance of the power system. Particularly, the approximate range of the damage point is determined by calculating the temperature ratio of the two ends of the damage point, so that the manual detection time is further shortened, the power supply level is greatly improved, and a foundation is laid for the maintenance of the power system.
Specifically, when the central control module determines that there is an open circuit of the detection wire, the central control module analyzes the voltage parameter group D0, and when Dj = D1 and Dj +1 ≈ 0 are stored, the central control module determines that the open circuit point is between the j-th detection block and the j + 1-th detection block.
When the circuit to be detected is broken, the voltage is stored in the broken section, the next detection point of the broken point has no voltage input, namely, the voltage does not exist, and the position of the broken point can be quickly determined by searching the two detection blocks with sudden change of the voltage value, so that the time for personnel to check is further reduced, the power supply level is greatly improved, and a foundation is laid for the maintenance of the power system.
In this embodiment, the absolute value of the value about equal to the range representing the difference between the value on the left side of the approximation number minus the value on the right side of the approximation number is no more than 5% of the value on the left side, e.g., Bj ≈ Bi, | ≦ 5% Bj,
dj +1 ≦ 5% Dj when Dj = D1 and Dj +1 ≈ 0.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An automatic fault searching method for an overhead transmission line is characterized by comprising the following steps,
s1, marking each detection block of the line to be detected, wherein N stringing poles are shared from a power station to a receiving point, and the detection blocks are marked as a first detection block, a second detection block and a … Nth detection block according to the sequence of gradually departing from the power station;
s2, each detection block carries out parameter acquisition on the line to be detected, and each detection block is respectively provided with a signal emitter corresponding to the detection block;
s3, a central control module is arranged at a power station at the power output end, the signal emitter sends signal information acquired by the corresponding detection block to the central control module, and the central control module performs data integration and analyzes whether a fault exists in the wire to be detected;
in S2, the data set detected by the ith detection block is Ai, and Ai includes a parameter Bi, a parameter Ci and a parameter Di, i =1,2,3,4 … N, N is a natural number greater than 0, where Bi is a current parameter at the detection point of the ith detection block, Ci is a wire temperature parameter at the detection point of the ith detection block, Di is a voltage parameter between the ith detection block and the ith-1 detection block, and when i =1, Di is a voltage parameter between the first detection block and the power station;
the acquisition interval duration of parameter acquisition of the line to be detected by each detection block is T1, when the line to be detected passes through T1, the line to be detected is subjected to a new round of parameter acquisition by each detection block, the data set detected by the ith detection block in the new round is Ai ', Ai' comprises parameters Bi ', Ci' and Di ', wherein Bi' is a current parameter of the detection point of the ith detection block after the acquisition interval duration T1, Ci 'is a wire temperature parameter of the detection point of the ith detection block after the acquisition interval duration T1, and Di' is a voltage parameter between the ith detection block and the (i-1) detection block after the acquisition interval duration T1;
and when the central control module judges that the fault exists in the electric wire to be detected, the central control module judges according to the data of each detection block to determine the position of the fault existence point.
2. The method for automatically searching for the fault of the overhead transmission line according to claim 1, wherein when the central control module performs data integration, the central control module collects current parameters of all the collection points to generate a current parameter group B0, wherein B0 includes a parameter B1, a parameter B2, and a parameter Bi … parameter BN of B2, and wherein B1 is a current parameter of a first detection block detection point, and B2 is a current parameter … Bi of a second detection block detection point, and B … BN is a current parameter of an ith detection block detection point;
the central control module collects the electric wire temperature parameters of all the acquisition points to generate an electric wire temperature parameter group C0, C0 comprises a parameter C1, a parameter C2 and a parameter …, namely a parameter Ci …, wherein C1 is the electric wire temperature parameter at the detection point of the first detection block, C2 is the electric wire temperature parameter at the detection point of the second detection block, Ci is the electric wire temperature parameter at the detection point of the ith detection block, and Cn is the electric wire temperature parameter at the detection point of the Nth detection block;
the central control module collects voltage parameters of all acquisition points to generate a voltage parameter group D0, D0 comprises a parameter D1, a parameter D2 and a parameter … parameter Di … parameter DN, wherein D1 is a voltage parameter between the first detection block and a power station, D2 is a voltage parameter between the second detection block and the first detection block, … Di is a voltage parameter between the ith detection block and the i-1 th detection block, and … Dn is a voltage parameter between the Nth detection block and the N-1 th detection block.
3. The automatic fault finding method for the overhead transmission line according to claim 2, wherein a first preset current standard value Bb1 and a second preset current standard value Bb2 are provided in the central control module, the central control module compares each item of data in the current parameter group B0 with the first preset current standard value Bb1 and the second preset current standard value Bb2 one by one,
and when the parameter Bi stored in the current parameter group B0 is not in the range of Bb 1-Bb 2, the central control module judges that the line to be detected has a fault.
4. The automatic fault finding method for the overhead transmission line according to claim 3, wherein when the current parameter group B0 contains Bi > Bb2 and Di ≈ 0, the central control module determines that the short circuit phenomenon exists in the detection electric line;
when Bi < Bb1 exists in the current parameter group B0, the central control module judges that the detection wire is broken;
when Bi ≈ 0 is stored in the current parameter group B0 and Di = D1, the central control module determines that the open circuit exists in the detection wire.
5. The method of claim 4, wherein when the central control module determines that the short circuit phenomenon exists in the detected wire, the central control module analyzes the current parameter set B0 to find the short circuit point,
when Bj is approximately equal to Bi and Bj +1 ≪ Bj exists, the central control module determines that a short-circuit point is between the j-th detection block and the j + 1-th detection block;
and when BN is approximately equal to Bi, the central control module judges that a short-circuit point is between the Nth detection block and the receiving power transformer.
6. The method of claim 4, wherein when the central control module determines that there is a damage to the detection line, the central control module individually subtracts the parameter set C0 from all the data parameters in the parameter set C0' of the temperature of the line over the collection interval time T1,
△C1=C1’- C1，△C2=C2’- C2，△C3=C3’- C3，…△CN=CN’- CN;
the central control module selects the maximum value delta Cj from the difference values, compares the values of delta Cj +1 and delta Cj-1,
when the delta Cj +1 is > -the delta Cj-1, the central control module judges that a breakage point is between the j detection block and the j +1 detection block;
when the delta Cj +1 is smaller than the delta Cj-1, the central control module judges that the breakage point is between the j-1 detection block and the j detection block.
7. The automatic searching method for the overhead transmission line fault according to claim 6, wherein when the central control module determines that the damaged point is between the j-1 detection block and the j-1 detection block, the central control module calculates a ratio Q of Δ Cj to Δ Cj-1, Q =Δcj/[ delta ] Cj-1, a distance parameter L between the j-1 detection block and the j-detection block is arranged in the central control module, the central control module calculates an approximate distance Lz between the damaged point and the j-detection block through the ratio Q, Lz = L x (Q-1) × Q, wherein Q is a compensation parameter of the ratio Q to the distance Lz; similarly, when the central control module judges that the damaged point is between the jth detection block and the jth +1 detection block, the position of the damaged point is calculated according to the same method.
8. The method of claim 7, wherein the central control module analyzes the voltage parameter set D0 when the central control module determines that there is an open circuit in the detection wire, and determines that the open circuit point is between the j-th detection block and the j + 1-th detection block when Dj = D1 and Dj +1 ≈ 0.
9. An automatic fault finding system for an overhead transmission line, to which the automatic fault finding method for an overhead transmission line according to any one of claims 1 to 8 is applied, comprising,
the detection block is arranged on the wire to be detected and used for detecting various parameters of the wire, and one detection block is arranged on each wire erecting rod of the same wire to be detected;
the signal emitter is connected with the detection block and used for generating data information collected by the detection block, and one signal emitter is arranged on each stringing pole;
the base station is wirelessly connected with the signal transmitter and is used for receiving the data information transmitted by the signal transmitter; the base station is internally provided with a central control module and a storage module, the central control module is used for analyzing the data information collected by the detection block, and the storage module is used for storing the data information collected by the detection block.
10. The automatic overhead transmission line fault locating system according to claim 9, wherein a solar panel is provided on the detection block, and the solar panel is used to provide energy to the detection block and the signal transmitter.
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