CN113253062B - Power cable fault inspection system based on risk hidden danger - Google Patents
Power cable fault inspection system based on risk hidden danger Download PDFInfo
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- CN113253062B CN113253062B CN202110675519.XA CN202110675519A CN113253062B CN 113253062 B CN113253062 B CN 113253062B CN 202110675519 A CN202110675519 A CN 202110675519A CN 113253062 B CN113253062 B CN 113253062B
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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
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
Abstract
The invention relates to a power cable fault inspection system based on risk hidden danger, wherein a central control unit firstly obtains the distance between a fault point and a transmitting end as S0, the central control unit transmits different pulse signals to the sequenced power cables, the calculated distance between the fault point and the transmitting end is compared with S0, the ratio of the obtained difference value which is less than or equal to a distance error Sw is set as Ax, if the central control unit adjusts the pulse signal, the ratio of the difference between the fault point distance and S0, which is less than or equal to the distance error Sw, is set to Atx and Ax for comparison, and different adjustments are carried out, if the adjustment is carried out for the second time, the central control unit compares the obtained A2tx with Atx, and the central control unit obtains a fault point or judges an operation fault according to the comparison result, the invention reduces the obstruction of hardware to the fault, and the distance between the fault point of the power cable fault and the transmitting point is accurately determined by the optimized inspection system in a layer-by-layer progressive adjusting mode.
Description
Technical Field
The invention relates to the technical field of inspection, in particular to a power cable fault inspection system based on a risk potential.
Background
The traditional inspection mode has the following problems: the inspection in-place confirmation mode is unscientific; the inspection result cannot be monitored and guaranteed; in the inspection process, missing inspection and error inspection occur sometimes; when the site is abnormal, the site operation cannot be directly and rapidly guided; the paper surface operation is complicated and time-consuming, the record is difficult to identify, and the data cannot be effectively analyzed; history records are difficult to trace and audit; the labor capacity of the inspection personnel is large, and the effect is not ideal.
In daily use of the power cable, the inspection workload is very huge and dangerous, and often, the condition of inaccurate detection caused by system errors exists in inspection, so that the power cable fault inspection system based on the risk hidden danger is still urgently needed in the prior art.
Disclosure of Invention
Therefore, the invention provides a power cable fault inspection system based on risk hidden danger, which is used for overcoming the problem that the power cable fault inspection system based on the risk hidden danger is urgently needed in the prior art.
In order to achieve the above object, the present invention provides a power cable fault inspection system based on risk hidden danger, including:
the signal transmitting unit is connected with the power cable and is used for transmitting pulse signals into the power cable;
the data acquisition unit is connected with the power cable and the signal transmitting unit and is used for acquiring pulse signals in the power cable in real time;
the central control unit is connected with the signal transmitting unit and used for controlling a pulse signal transmitted by the signal transmitting unit, the central control unit is connected with the data acquisition unit and used for receiving data of the data acquisition unit, analyzing the data, adjusting the transmitted data of the signal transmitting unit or obtaining a fault point or judging the operation fault of the signal transmitting unit, and the central control unit is connected with the power cable and used for sequencing the power cable;
the data storage unit is connected with the central control unit and used for storing data information in the inspection process;
when the inspection system inspects the power cable fault, the central control unit transmits the power cable according to a preset pulse signal F0, the data acquisition unit acquires the pulse signal in the power cable in real time and records the time of transmitting the pulse and the time of reflecting the pulse, and the central control unit calculates the distance between the fault point with the risk potential and the transmitting end in the power cable to be S0 according to the time of receiving the transmitted pulse and the time of reflecting the pulse transmitted by the data acquisition unit in real time and the transmission speed of the pulse in the power cable;
the central control unit sequences the power cables in sequence, sequentially transmits pulse signals Fi gradually increasing to the power cables according to the sequencing sequence, calculates the distances between fault points and transmitting ends of the power cables to be Si, compares the Si with S0 respectively to obtain a difference absolute value Sci, sets the proportion of the obtained Sci which is less than or equal to a distance error Sw to be Ax, if Ax is within a preset range, the central control unit adjusts the transmitted pulse signals to be Fti, if Ax is not within the preset range, the central control unit judges that the signal transmitting unit has an operation fault or determines that the distance between the fault points and the transmitting ends is Si, and sets i =1,2,3, …, n and n to be integers greater than 1;
the central control unit calculates fault points of a plurality of power cables and distances Sti of transmitting ends after running according to the adjusted pulse signals Fti, compares Sti with S0 respectively to obtain absolute difference values Stci, sets the proportion smaller than or equal to a distance error Sw in Stci as Atx, compares Atx with Ax, regulates the pulse signals transmitted by the signal transmitting unit to be F2ti for two times if the comparison result is in a preset range, and judges that the signal transmitting unit has a fault in running or determines that the distance between the fault points and the transmitting ends is Sti if the comparison result is not in the preset range;
the central control unit calculates the distances S2ti between the fault point and the transmitting end of a plurality of power cables after running according to the pulse signal F2ti after secondary adjustment, the central control unit compares S2ti with S0 respectively to obtain absolute difference values S2tci, the proportion of the distance error Sw smaller than or equal to in S2tci is set as A2tx, the central control unit compares A2tx with Atx, if the comparison result is within a preset range, the central control unit determines that the distance between the fault point and the transmitting end is S2ti, and if the comparison result is not within the preset range, the central control unit determines that the signal transmitting unit is in fault operation.
Further, pulse emission signals F1, F2, F3, … and Fn are preset in the central control unit, wherein F1 represents a first preset pulse signal, F2 represents a second preset pulse signal, F3 represents a third preset pulse signal, and Fn represents an nth preset pulse signal;
power cables D1, D2, D3, … and Dn are preset in the central control unit, wherein D1 represents a first preset power cable, D2 represents a second preset power cable, D3 represents a third preset power cable, and Dn represents an nth preset power cable.
Further, the central control unit controls the signal transmitting unit to transmit different pulse transmitting signals to different power cables and receives transmitting pulse time and reflected pulse time in a plurality of power cables in real time, the power cables are set to be Di, i =1,2,3, …, n,
if Di is D1, the central control unit controls the pulse signal transmitted by the signal transmitting unit to the first power cable to be F1;
if Di is D2, the central control unit controls the pulse signal transmitted by the signal transmitting unit to the second power cable to be F2;
if Di is D3, the central control unit controls the pulse signal transmitted by the signal transmitting unit to the third power cable to be F3;
if Di is Dn, the central control unit controls the pulse signal transmitted by the signal transmitting unit to the nth power cable to be Fn.
Further, the central control unit obtains transmitted pulses and reflected pulse signals of the plurality of power cables by transmitting different pulse transmitting signals to the plurality of power cables, and the central control unit calculates distances between a fault point with a risk potential and a transmitting end in the plurality of power cables to be S1, S2, S3, … and Sn, wherein S1 represents the distance between the fault point and the transmitting end calculated after a first pulse signal F1 is introduced into a first power cable D1, S2 represents the distance between the fault point and the transmitting end calculated after a second pulse signal F2 is introduced into a second power cable D2, S3 represents the distance between the fault point and the transmitting end calculated after a third pulse signal F3 is introduced into a third power cable D3, and Sn represents the distance between the fault point and the transmitting end calculated after an nth pulse signal Fn is introduced into an nth power cable Dn;
the central control unit compares S1, S2, S3, … and Sn with S0 respectively to obtain absolute difference values Sc1, Sc2, Sc3, … and Scn, wherein Sc1 represents the absolute difference value between S1 and S0, Sc2 represents the absolute difference value between S2 and S0, Sc3 represents the absolute difference value between S3 and S0, and Scn represents the absolute difference value between Sn and S0.
Further, the central control unit compares Sc1, Sc2, Sc3, …, Scn with Sw respectively, sets the distance error to Sw, calculates the ratio smaller than or equal to Sw in Sci to be Ax, sets the pulse signal emitted by the signal emitting unit to be Fi, sets i =1,2,3, …, n,
if the Ax is more than 80% and less than or equal to 90%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be Fti, and Fti =1.15 × Fi;
if the Ax is more than 70% and less than or equal to 80%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be Fti, and Fti =1.1 × Fi;
if the Ax is more than 60% and less than or equal to 70%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be Fti, and Fti =1.05 × Fi;
if Ax is more than 90% or Ax is less than or equal to 60%, the central control unit does not adjust the pulse signal transmitted by the signal transmitting unit.
Furthermore, when the central control unit does not adjust the pulse signal transmitted by the transmitting unit, the central control unit judges that the operating state of the signal transmitting unit is,
if Ax is larger than 90%, the central control unit judges that the signal transmitting unit has operation failure;
if Ax is less than or equal to 60%, the central control unit judges that the signal transmitting unit normally operates, and takes the detected Si as the distance between the fault point and the transmitting end;
the inspection system is also provided with an alarm unit, if the central control unit judges that the signal transmitting unit has a fault in operation, the central control unit sends an alarm instruction to the alarm unit, and the alarm unit sends an alarm notice.
Further, when the central control unit adjusts the pulse signal transmitted by the transmitting unit, the central control unit operates according to the adjusted pulse signal Fti, transmits the adjusted pulse signal Fti to each power cable Di, and obtains the distances between the fault point and the transmitting end as St1, St2, St3, … and Stn, wherein St1 represents the distance between the fault point and the transmitting end calculated after the first pulse signal Ft1 is fed into the first power cable D1, St2 represents the distance between the fault point and the transmitting end calculated after the second pulse signal Ft2 is fed into the second power cable D2, St3 represents the distance between the fault point and the transmitting end calculated after the third pulse signal Ft3 is fed into the third power cable D3, and Stn represents the distance between the fault point and the transmitting end calculated after the nth pulse signal Ftn is fed into the nth power cable Dn;
the central control unit compares St1, St2, St3, St … and Stn with S0 respectively to obtain absolute difference values Stc1, Stc2, Stc3, … and Stcn, wherein Stc1 represents the absolute difference value between St1 and S0, Stc2 represents the absolute difference value between St2 and S0, Stc3 represents the absolute difference value between St3 and S0, and Stcn represents the absolute difference value between Stn and S0;
the central control unit compares Stc1, Stc2, Stc3, … and Stcn with Sw respectively to set a distance error Sw, the central control unit calculates the quantity ratio of the Sw to be less than or equal to Stci as Atx, the central control unit compares the Atx with Ax,
if Ax-Atx is larger than 5%, the central control unit judges that the signal transmitting unit normally operates, and takes the detected Sti as the distance between the fault point and the transmitting end;
if the Ax-Atx is more than 0 and less than or equal to 5 percent, the central control unit carries out secondary regulation on the pulse signal transmitted by the signal transmitting unit;
and if the Ax-Atx is more than or equal to 0, the central control unit judges that the signal transmitting unit has operation failure.
Further, if the central control unit secondarily adjusts the pulse signal transmitted by the signal transmitting unit, the adjusted pulse signal transmitted by the signal transmitting unit is set to be F2ti, i =1,2,3, …, n,
if the Atx is more than 80% and less than or equal to 90%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be F2ti, and F2ti =1.15 × Fti;
if the Atx is more than 70% and less than or equal to 80%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be F2ti, and F2ti =1.1 × Fti;
if the Atx is more than 60% and less than or equal to 70%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be F2ti, and F2ti =1.05 × Fti;
if the Atx is larger than 90%, the central control unit judges that the signal transmitting unit has a running fault;
and if the Atx is less than or equal to 60 percent, the central control unit judges that the signal transmitting unit normally operates, and the detected Sti is taken as the distance between the fault point and the transmitting end.
Further, after the central control unit performs secondary adjustment on the pulse signal transmitted by the transmitting unit, the central control unit operates according to the adjusted pulse signal F2ti, transmits the adjusted pulse signal F2ti to each power cable Di, and obtains the distances between the fault point and the transmitting end, which are S2t1, S2t2, S2t3, … and S2tn, where S2t1 represents the calculated distance between the fault point and the transmitting end after the first pulse signal F2t1 is introduced into the first power cable D1, S2t2 represents the calculated distance between the fault point and the transmitting end after the second pulse signal F2t2 is introduced into the second power cable D2, S2t 38 represents the calculated distance between the fault point and the transmitting end after the third pulse signal F2t3 is introduced into the third power cable D3, and S2tn represents the calculated distance between the fault point and the transmitting end after the nth pulse signal F2t3 is introduced into the nth power cable Dn;
the central control unit compares S2t1, S2t2, S2t3, … and S2tn with S0 respectively to obtain absolute difference values S2tc1, S2tc2, S2tc3, … and S2tc, wherein S2tc1 represents the absolute difference value between S2t1 and S0, S2tc2 represents the absolute difference value between S2t2 and S0, S2tc3 represents the absolute difference value between S2t3 and S0, and S2tc represents the absolute difference value between S2tn and S0.
Further, the central control unit compares S2tc1, S2tc2, S2tc3, … and S2tc with Sw respectively, the central control unit sets the ratio of S2tc less than or equal to Sw as A2tx, the central control unit compares A2tx with Atx,
if the Atx-A2tx is larger than or equal to 5%, the central control unit judges that the signal transmitting unit normally operates, and the detected S2ti is used as the distance between the fault point and the transmitting end;
and if the Atx-A2tx is less than 5%, the central control unit judges that the signal transmitting unit is in operation failure.
Compared with the prior art, the invention has the advantages that the invention provides the power cable fault inspection system based on the risk potential, the central control unit transmits the pulse signals to the power cable according to the preset pulse signals, the data acquisition unit acquires the pulse signals in the power cable in real time, the distance between the fault point with the risk potential and the transmitting end in the power cable is calculated to be S0 by combining the propagation speed of the pulse in the power cable, the central control unit sorts the power cable, transmits different pulse signals to the power cable according to the sorting order, calculates the calculated distances between a plurality of fault points and the transmitting end and the pre-calculated S0 to calculate the difference value, the number ratio Ax of the difference value is less than or equal to the distance error Sw, the central control unit adjusts the transmitting data of the signal transmitting unit according to the difference of the ratio or determines the distance between the fault point and the transmitting end or determines the operation fault of the signal transmitting unit, if the adjustment is carried out according to the adjusted pulse signal, the central control unit compares the calculated difference between the distance between the fault point and the transmitting end and S0, wherein the ratio of the distance error Sw is less than or equal to Atx and Ax, the central control unit carries out secondary adjustment on the transmitting data of the signal transmitting unit according to the comparison result or obtains the distance between a fault point and a transmitting end or judges the operation fault of the signal transmitting unit, if the transmitting unit transmits the pulse signal after secondary modulation, the central control unit compares the calculated difference between the distance between the fault point and the transmitting end and S0, wherein the ratio of the difference is less than or equal to the distance error Sw is A2tx with Atx, the central control unit obtains the distance between the fault point and the transmitting end or judges the operation fault of the signal transmitting unit according to the comparison result, the invention reduces the obstruction of hardware to the fault, and optimizing the accurate determination of the distance between the fault point of the power cable fault and the transmitting point by the inspection system through a layer-by-layer progressive adjusting mode.
Particularly, according to the method for injecting the pulse signals into the power cables, the fault signals can be timely acquired when the power cables are in fault, system faults are checked according to the proportion of the range of the distances between the transmitting ends of the power cables and the fault points, the condition that the inspection result is inaccurate due to the faults of the transmitting units is reduced, the pulse signals of different degrees are adjusted according to the power cables in the preset range of the proportion, and the accurate detection of the inspection system on the fault points is improved.
Furthermore, different pulse signals are introduced into the power cables to acquire the distances of the fault points, the measurement error is reduced by comparing the difference between the distance and the preset distance, meanwhile, the absolute value of the difference is smaller than the difference of the preset distance, so that the proportion of the distance is determined, different adjustment modes are performed on different proportions, fault alarm is directly prompted on the obvious error condition, the inspection efficiency of the inspection system is improved, and the inspection effect of the inspection system on the power cables is improved in a gradual adjustment mode by performing different adjustment modes on the ranges of different proportions, so that accurate fault points are obtained.
Drawings
Fig. 1 is a functional framework diagram of the power cable fault inspection system based on the risk potential 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, the present invention provides a power cable fault inspection system based on risk hazards, including:
the signal transmitting unit is connected with the power cable and is used for transmitting pulse signals into the power cable;
the data acquisition unit is connected with the power cable and the signal transmitting unit and is used for acquiring pulse signals in the power cable in real time;
the central control unit is connected with the signal transmitting unit and used for controlling a pulse signal transmitted by the signal transmitting unit, the central control unit is connected with the data acquisition unit and used for receiving data of the data acquisition unit, analyzing the data, adjusting the transmitted data of the signal transmitting unit or obtaining a fault point or judging the operation fault of the signal transmitting unit, and the central control unit is connected with the power cable and used for sequencing the power cable;
and the data storage unit is connected with the central control unit and used for storing data information in the polling process.
Specifically, in the embodiment of the present invention, when the inspection system inspects the power cable fault, the central control unit transmits the pulse signal F0 to the power cable according to the preset pulse signal, the data acquisition unit acquires the pulse signal in the power cable in real time and records the time of transmitting the pulse and the time of reflecting the pulse, and the central control unit calculates the distance between the fault point where the risk hazard occurs and the transmitting end in the power cable as S0 according to the time of receiving the transmitted pulse and the time of reflecting the pulse transmitted by the data acquisition unit in real time and by combining the propagation speed of the pulse in the power cable.
Specifically, in the embodiment of the present invention, the central control unit sequences the power cables in sequence, and sequentially transmits pulse signals Fi gradually increasing to the power cables in sequence, the central control unit calculates that distances between a fault point and a transmitting end of the power cables are Si, and compares Si with S0 respectively to obtain an absolute value of difference Sci, the central control unit sets a ratio of the obtained Sci that is less than or equal to a distance error Sw to Ax, if Ax is within a preset range, the central control unit adjusts the transmitted pulse signal to Fti, if not, the central control unit determines that the signal transmitting unit is in operation fault or determines that the distance between the fault point and the transmitting end is Si, and sets i =1,2,3, …, n, n is an integer greater than 1.
Specifically, in the embodiment of the present invention, the central control unit operates according to the adjusted pulse signal Fti, and then calculates the distances Sti between the fault point and the transmitting end of the power cables, the central control unit compares Sti with S0 to obtain absolute difference values Sti, the central control unit sets a ratio smaller than or equal to the distance error Sw in Sti to Atx, the central control unit compares Atx with Ax, if the comparison result is within a preset range, the central control unit secondarily adjusts the pulse signal transmitted by the signal transmitting unit to F2ti, and if not, the central control unit determines that the signal transmitting unit has an operation fault or determines that the distance between the fault point and the transmitting end is Sti.
Specifically, in the embodiment of the present invention, after the central control unit operates according to the pulse signal F2ti after secondary adjustment, the central control unit calculates the distances S2ti between the fault point and the transmitting end of the power cables, the central control unit compares S2ti with S0 to obtain absolute difference values S2tci, the central control unit sets the ratio smaller than or equal to the distance error Sw in S2tci to be A2tx, the central control unit compares A2tx with Atx, if the comparison result is within a preset range, the central control unit determines that the distance between the fault point and the transmitting end is S2ti, and if the comparison result is not within the preset range, the central control unit determines that the signal transmitting unit operates in fault.
Specifically, in the embodiment of the present invention, pulse emission signals F1, F2, F3, …, and Fn are preset in the central control unit, where F1 represents a first preset pulse signal, F2 represents a second preset pulse signal, F3 represents a third preset pulse signal, and Fn represents an nth preset pulse signal.
Specifically, in the embodiment of the present invention, the pulse transmission signal Fi is set to i =1,2,3, …, n, F1 is smaller than F2, F2 is smaller than F3, and F3 is smaller than Fn, and is set to F1 and Fn as the minimum transmission pulse and the maximum transmission pulse in the embodiment of the present invention in an increasing manner, and when the transmission pulse Fi is adjusted, if F (1-1) is adjusted for F1, F1 is used as the adjusted transmission pulse, and if F (n + 1) is adjusted for Fn, Fn is used as the adjusted transmission pulse.
Specifically, in the embodiment of the present invention, for the transmitted pulse signal smaller than F1 and larger than Fn, without departing from the protection scope of the present invention, the pulse waveform of Fi in the present invention may be a rectangular waveform or a sawtooth waveform, the adjustment of Fi may be the adjustment of pulse width or the adjustment of transmitted pulse voltage, the adjustment of pulse voltage is used in the present embodiment, and the present invention does not limit the manner and type of adjustment, and is subject to specific implementation.
Power cables D1, D2, D3, … and Dn are preset in the central control unit, wherein D1 represents a first preset power cable, D2 represents a second preset power cable, D3 represents a third preset power cable, and Dn represents an nth preset power cable. In the embodiment of the invention, the power cables are numbered indiscriminately, that is, the number is numbered in sequence, the number of the power cables is at least not less than three, and the more data is, the more accurate the data is, but the specific number is not limited by the invention, so that the adjustment determination mode of the invention can be realized.
Specifically, in the embodiment of the present invention, the central control unit controls the signal transmitting unit to transmit different pulse transmitting signals to different power cables, and receives the pulse transmitting time and the pulse reflecting time in a plurality of power cables in real time, where Di is set as a power cable, i =1,2,3, …, n is set as,
if Di is D1, the central control unit controls the pulse signal transmitted by the signal transmitting unit to the first power cable to be F1;
if Di is D2, the central control unit controls the pulse signal transmitted by the signal transmitting unit to the second power cable to be F2;
if Di is D3, the central control unit controls the pulse signal transmitted by the signal transmitting unit to the third power cable to be F3;
if Di is Dn, the central control unit controls the pulse signal transmitted by the signal transmitting unit to the nth power cable to be Fn.
Specifically, in the embodiment of the present invention, the central control unit obtains the transmitted pulses and the reflected pulse signals of the plurality of power cables by transmitting different pulse transmission signals to the plurality of power cables, and the central control unit calculates distances between a fault point where a risk hazard occurs and a transmission end in the plurality of power cables as S1, S2, S3, …, and Sn, where S1 represents a distance between the fault point and the transmission end calculated after a first pulse signal F1 is introduced into a first power cable D1, S2 represents a distance between the fault point and the transmission end calculated after a second pulse signal F2 is introduced into a second power cable D2, S3 represents a distance between the fault point and the transmission end calculated after a third pulse signal F3 is introduced into a third power cable D3, and Sn represents a distance between the fault point and the transmission end calculated after an nth pulse signal Fn is introduced into an nth power cable Dn.
The central control unit compares S1, S2, S3, … and Sn with S0 respectively to obtain absolute difference values Sc1, Sc2, Sc3, … and Scn, wherein Sc1 represents the absolute difference value between S1 and S0, Sc2 represents the absolute difference value between S2 and S0, Sc3 represents the absolute difference value between S3 and S0, and Scn represents the absolute difference value between Sn and S0.
Specifically, in the embodiment of the present invention, the central control unit compares Sc1, Sc2, Sc3, …, Scn with Sw, respectively, and sets the distance error to Sw, the central control unit calculates the ratio smaller than or equal to Sw in Sci to be Ax, sets the pulse signal emitted by the signal emitting unit to be Fi, sets i =1,2,3, …, n,
if the Ax is more than 80% and less than or equal to 90%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be Fti, and Fti =1.15 × Fi;
if the Ax is more than 70% and less than or equal to 80%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be Fti, and Fti =1.1 × Fi;
if the Ax is more than 60% and less than or equal to 70%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be Fti, and Fti =1.05 × Fi;
if Ax is more than 90% or Ax is less than or equal to 60%, the central control unit does not adjust the pulse signal transmitted by the signal transmitting unit.
Specifically, in the embodiment of the present invention, when comparing the distances Si and S0, for example, when Si is S1, Sc1= | S1-S0|, Sw is set to 10 meters, S1 is set to 2 meters, and S0 is set to 50 meters, then Sc1=48, then Sc1 is not less than or equal to Sw, if Sc1, Sc2, Sc3, …, and Scn are compared with Sw, 10 is less than or equal to Sw, and if the total number is 100, Ax =10%, then the detected Si is directly used as the distance between the failure point and the transmitting end.
Specifically, in the embodiment of the present invention, in the process of adjusting Fi, when the adjustment is made to Fti =1.05 × Fi, if i =1, Ft1=1.05 × F1, if i =2, Ft2=1.05 × F2, if i =3, Ft3=1.05 × F3, and if i = n, Ftn =1.05 × Fn.
Specifically, in the embodiment of the present invention, when the central control unit does not adjust the pulse signal transmitted by the transmitting unit, the central control unit determines that the operating state of the signal transmitting unit is,
if Ax is larger than 90%, the central control unit judges that the signal transmitting unit has operation failure;
and if Ax is less than or equal to 60%, the central control unit judges that the signal transmitting unit normally operates, and takes the detected Si as the distance between the fault point and the transmitting end.
The inspection system is also provided with an alarm unit, if the central control unit judges that the signal transmitting unit has a fault in operation, the central control unit sends an alarm instruction to the alarm unit, and the alarm unit sends an alarm notice.
Specifically, in the embodiment of the present invention, when the central control unit adjusts the pulse signal transmitted by the transmitting unit, the central control unit operates according to the adjusted pulse signal Fti, transmits the adjusted pulse signal Fti to each power cable Di, and obtains the distances between the fault point and the transmitting end as St1, St2, St3, …, and Stn, where St1 represents the distance between the fault point and the transmitting end calculated after the first pulse signal Ft1 is fed into the first power cable D1, St2 represents the distance between the fault point and the transmitting end calculated after the second pulse signal Ft2 is fed into the second power cable D2, St3 represents the distance between the fault point and the transmitting end calculated after the third pulse signal Ft3 is fed into the third power cable D3, and Stn represents the distance between the fault point and the transmitting end calculated after the nth pulse signal Ftn is fed into the nth power cable Dn.
Specifically, in the embodiment of the present invention, the central control unit compares St1, St2, St3, …, Stn with S0 to obtain absolute difference values Stc1, Stc2, Stc3, …, Stcn, where Stc1 represents the absolute difference value between St1 and S0, Stc2 represents the absolute difference value between St2 and S0, Stc3 represents the absolute difference value between St3 and S0, and Stcn represents the absolute difference value between Stn and S0.
Specifically, in the embodiment of the present invention, the central control unit compares Stc1, Stc2, Stc3, … and Stcn with Sw respectively to set the distance error Sw, the central control unit calculates the proportion of the number of Sw in Stci to be smaller than or equal to Sw as Atx, the central control unit compares Atx with Ax,
if Ax-Atx is larger than 5%, the central control unit judges that the signal transmitting unit normally operates, and takes the detected Sti as the distance between the fault point and the transmitting end;
if the Ax-Atx is more than 0 and less than or equal to 5 percent, the central control unit carries out secondary regulation on the pulse signal transmitted by the signal transmitting unit;
and if the Ax-Atx is more than or equal to 0, the central control unit judges that the signal transmitting unit has operation failure.
Specifically, in the embodiment of the present invention, when the central control unit secondarily adjusts the pulse signal transmitted by the signal transmitting unit, the adjusted pulse signal transmitted by the signal transmitting unit is set to be F2ti, i =1,2,3, …, n,
if the Atx is more than 80% and less than or equal to 90%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be F2ti, and F2ti =1.15 × Fti;
if the Atx is more than 70% and less than or equal to 80%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be F2ti, and F2ti =1.1 × Fti;
if the Atx is more than 60% and less than or equal to 70%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be F2ti, and F2ti =1.05 × Fti;
if the Atx is larger than 90%, the central control unit judges that the signal transmitting unit has a running fault;
and if the Atx is less than or equal to 60 percent, the central control unit judges that the signal transmitting unit normally operates, and the detected Sti is taken as the distance between the fault point and the transmitting end.
Specifically, in the embodiment of the present invention, after the central control unit performs secondary adjustment on the pulse signal transmitted by the transmitting unit, the central control unit operates according to the adjusted pulse signal F2ti, transmits the adjusted pulse signal F2ti to each power cable Di, and obtains the distance between the fault point and the transmitting end as S2t1, S2t2, S2t3, …, and S2tn, where S2t1 represents the distance between the fault point and the transmitting end calculated after the first pulse signal F2t1 is introduced into the first power cable D1, S2t2 represents the distance between the fault point and the transmitting end calculated after the second pulse signal F2t2 is introduced into the second power cable D2, S2t3 represents the distance between the fault point and the transmitting end calculated after the third pulse signal F2t3 is introduced into the third power cable D3, and S2tn represents the distance between the fault point and the transmitting end calculated after the nth pulse signal F2t 367 is introduced into the nth power cable Dn 2 tn.
Specifically, in the embodiment of the present invention, the central control unit compares S2t1, S2t2, S2t3, …, and S2tn with S0, respectively, to obtain absolute difference values S2tc1, S2tc2, S2tc3, …, and S2tcn, where S2tc1 represents an absolute difference value between S2t1 and S0, S2tc2 represents an absolute difference value between S2t2 and S0, S2tc3 represents an absolute difference value between S2t3 and S0, and S2tcn represents an absolute difference value between S2tn and S0.
Specifically, in the embodiment of the present invention, the central control unit compares S2tc1, S2tc2, S2tc3, …, and S2tc with Sw, respectively, the central control unit sets a ratio smaller than or equal to Sw in S2tc to A2tx, the central control unit compares A2tx with Atx,
if the Atx-A2tx is larger than or equal to 5%, the central control unit judges that the signal transmitting unit normally operates, and the detected S2ti is used as the distance between the fault point and the transmitting end;
and if the Atx-A2tx is less than 5%, the central control unit judges that the signal transmitting unit is in operation failure.
Specifically, in the embodiment of the present invention, the inspection system may further include a human-machine interface unit, a time counting unit, a converter unit, an amplifier or a signal conditioner unit. When the inspection system acquires the pulse signals, the pulse signals and the reflected echo signals thereof can be acquired by a sensor or can be sampled by a high-speed A/D converter.
Specifically, according to the method for injecting the pulse signals into the power cables, the fault signals can be timely acquired when the power cables are in fault, system faults are checked according to the proportion of the range of the distances between the transmitting ends of the power cables and the fault points, the condition that the inspection result is inaccurate due to the faults of the transmitting units is reduced, the pulse signals of different degrees are adjusted according to the power cables of which the proportion is within the preset range, and the accurate detection of the inspection system on the fault points is improved.
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. The utility model provides a power cable trouble system of patrolling and examining based on risk hidden danger which characterized in that includes:
the signal transmitting unit is connected with the power cable and is used for transmitting pulse signals into the power cable;
the data acquisition unit is connected with the power cable and the signal transmitting unit and is used for acquiring pulse signals in the power cable in real time;
the central control unit is connected with the signal transmitting unit and used for controlling a pulse signal transmitted by the signal transmitting unit, the central control unit is connected with the data acquisition unit and used for receiving data of the data acquisition unit, analyzing the data, adjusting the transmitted data of the signal transmitting unit or obtaining the distance between a fault point and a transmitting end or judging the operation fault of the signal transmitting unit, and the central control unit is connected with a power cable and used for sequencing the power cable;
the data storage unit is connected with the central control unit and used for storing data information in the inspection process;
when the inspection system inspects the power cable fault, the central control unit transmits the power cable according to a preset pulse signal F0, the data acquisition unit acquires the pulse signal in the power cable in real time and records the time of transmitting the pulse and the time of reflecting the pulse, and the central control unit calculates the distance between the fault point with the risk potential and the transmitting end in the power cable to be S0 according to the time of receiving the transmitted pulse and the time of reflecting the pulse transmitted by the data acquisition unit in real time and the transmission speed of the pulse in the power cable;
the central control unit sequences the power cables in sequence, sequentially transmits pulse signals Fi gradually increasing to the power cables according to the sequencing sequence, calculates the distances between fault points and transmitting ends of the power cables to be Si, compares the Si with S0 respectively to obtain a difference absolute value Sci, sets the proportion of the obtained Sci which is less than or equal to a distance error Sw to be Ax, if Ax is within a preset range, the central control unit adjusts the transmitted pulse signals to be Fti, if Ax is not within the preset range, the central control unit judges that the signal transmitting unit has an operation fault or determines that the distance between the fault points and the transmitting ends is Si, and sets i =1,2,3, …, n and n to be integers greater than 1;
the central control unit calculates fault points of a plurality of power cables and distances Sti of transmitting ends after running according to the adjusted pulse signals Fti, compares Sti with S0 respectively to obtain absolute difference values Stci, sets the proportion smaller than or equal to a distance error Sw in Stci as Atx, compares Atx with Ax, regulates the pulse signals transmitted by the signal transmitting unit to be F2ti for two times if the comparison result is in a preset range, and judges that the signal transmitting unit has a fault in running or determines that the distance between the fault points and the transmitting ends is Sti if the comparison result is not in the preset range;
the central control unit calculates the distances S2ti between the fault point and the transmitting end of a plurality of power cables after running according to the pulse signal F2ti after secondary adjustment, the central control unit compares S2ti with S0 respectively to obtain absolute difference values S2tci, the proportion of the distance error Sw smaller than or equal to in S2tci is set as A2tx, the central control unit compares A2tx with Atx, if the comparison result is within a preset range, the central control unit determines that the distance between the fault point and the transmitting end is S2ti, and if the comparison result is not within the preset range, the central control unit determines that the signal transmitting unit is in fault operation.
2. The power cable fault inspection system based on the risk potential according to claim 1, wherein pulse emission signals F1, F2, F3, … and Fn are preset in the central control unit, wherein F1 represents a first preset pulse signal, F2 represents a second preset pulse signal, F3 represents a third preset pulse signal, and Fn represents an nth preset pulse signal;
power cables D1, D2, D3, … and Dn are preset in the central control unit, wherein D1 represents a first preset power cable, D2 represents a second preset power cable, D3 represents a third preset power cable, and Dn represents an nth preset power cable.
3. The power cable fault inspection system based on the risk potential according to claim 2, wherein the central control unit controls the signal transmitting unit to transmit different pulse transmitting signals to different power cables and to receive the pulse transmitting time and the pulse reflecting time of a plurality of power cables in real time, the power cables are set to be Di, i =1,2,3, …, n,
if Di is D1, the central control unit controls the pulse signal transmitted by the signal transmitting unit to the first power cable to be F1;
if Di is D2, the central control unit controls the pulse signal transmitted by the signal transmitting unit to the second power cable to be F2;
if Di is D3, the central control unit controls the pulse signal transmitted by the signal transmitting unit to the third power cable to be F3;
if Di is Dn, the central control unit controls the pulse signal transmitted by the signal transmitting unit to the nth power cable to be Fn.
4. The risk potential based power cable fault inspection system according to claim 3, the central control unit transmits different pulse transmitting signals to a plurality of power cables to obtain transmitting pulse and reflected pulse signals of the power cables, the central control unit calculates the distances between the fault point with the risk hidden danger and the transmitting end in the plurality of power cables to be S1, S2, S3, … and Sn, wherein S1 represents the distance between the fault point and the transmitting end calculated after the first pulse signal F1 is fed into the first power cable D1, S2 represents the distance between the fault point and the transmitting end calculated after the second pulse signal F2 is fed into the second power cable D2, S3 represents the distance between the fault point and the transmitting end calculated after the third pulse signal F3 is fed into the third power cable D3, and Sn represents the distance between the fault point and the transmitting end calculated after the nth pulse signal Fn is fed into the nth power cable Dn;
the central control unit compares S1, S2, S3, … and Sn with S0 respectively to obtain absolute difference values Sc1, Sc2, Sc3, … and Scn, wherein Sc1 represents the absolute difference value between S1 and S0, Sc2 represents the absolute difference value between S2 and S0, Sc3 represents the absolute difference value between S3 and S0, and Scn represents the absolute difference value between Sn and S0.
5. The risk potential-based power cable fault inspection system according to claim 4, wherein the central control unit compares Sc1, Sc2, Sc3, …, Scn with Sw, respectively, sets the distance error to Sw, calculates the ratio of the Sci less than or equal to Sw to be Ax, sets the pulse signal emitted by the signal emitting unit to be Fi, sets i =1,2,3, …, n,
if the Ax is more than 80% and less than or equal to 90%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be Fti, and Fti =1.15 × Fi;
if the Ax is more than 70% and less than or equal to 80%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be Fti, and Fti =1.1 × Fi;
if the Ax is more than 60% and less than or equal to 70%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be Fti, and Fti =1.05 × Fi;
if Ax is more than 90% or Ax is less than or equal to 60%, the central control unit does not adjust the pulse signal transmitted by the signal transmitting unit.
6. The power cable fault inspection system according to claim 5, wherein when the central control unit does not adjust the pulse signal transmitted by the transmitting unit, the central control unit determines that the operating state of the signal transmitting unit is,
if Ax is larger than 90%, the central control unit judges that the signal transmitting unit has operation failure;
if Ax is less than or equal to 60%, the central control unit judges that the signal transmitting unit normally operates, and takes the detected Si as the distance between the fault point and the transmitting end;
the inspection system is also provided with an alarm unit, if the central control unit judges that the signal transmitting unit has a fault in operation, the central control unit sends an alarm instruction to the alarm unit, and the alarm unit sends an alarm notice.
7. The risk potential based power cable fault inspection system according to claim 6, when the central control unit adjusts the pulse signal transmitted by the transmitting unit, the central control unit operates according to the adjusted pulse signal Fti, the adjusted pulse signal Fti is transmitted to each power cable Di, and the distances from the fault point to the transmitting end are obtained as St1, St2, St3, …, Stn, wherein St1 represents the distance between the fault point and the transmitting end calculated after the first pulse signal Ft1 is fed into the first power cable D1, St2 represents the distance between the fault point and the transmitting end calculated after the second pulse signal Ft2 is fed into the second power cable D2, St3 represents the distance between the fault point and the transmitting end calculated after the third pulse signal Ft3 is fed into the third power cable D3, and Stn represents the distance between the fault point and the transmitting end calculated after the nth pulse signal Ftn is fed into the nth power cable Dn;
the central control unit compares St1, St2, St3, St … and Stn with S0 respectively to obtain absolute difference values Stc1, Stc2, Stc3, … and Stcn, wherein Stc1 represents the absolute difference value between St1 and S0, Stc2 represents the absolute difference value between St2 and S0, Stc3 represents the absolute difference value between St3 and S0, and Stcn represents the absolute difference value between Stn and S0;
the central control unit compares Stc1, Stc2, Stc3, … and Stcn with Sw respectively to set a distance error Sw, the central control unit calculates the quantity ratio of the Sw to be less than or equal to Stci as Atx, the central control unit compares the Atx with Ax,
if Ax-Atx is larger than 5%, the central control unit judges that the signal transmitting unit normally operates, and takes the detected Sti as the distance between the fault point and the transmitting end;
if the Ax-Atx is more than 0 and less than or equal to 5 percent, the central control unit carries out secondary regulation on the pulse signal transmitted by the signal transmitting unit;
and if the Ax-Atx is more than or equal to 0, the central control unit judges that the signal transmitting unit has operation failure.
8. The power cable fault inspection system according to claim 7, wherein if the central control unit secondarily adjusts the pulse signal transmitted by the signal transmitting unit, the adjusted pulse signal transmitted by the signal transmitting unit is set to F2ti, i =1,2,3, …, n,
if the Atx is more than 80% and less than or equal to 90%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be F2ti, and F2ti =1.15 × Fti;
if the Atx is more than 70% and less than or equal to 80%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be F2ti, and F2ti =1.1 × Fti;
if the Atx is more than 60% and less than or equal to 70%, the central control unit adjusts the pulse signal transmitted by the signal transmitting unit to be F2ti, and F2ti =1.05 × Fti;
if the Atx is larger than 90%, the central control unit judges that the signal transmitting unit has a running fault;
and if the Atx is less than or equal to 60 percent, the central control unit judges that the signal transmitting unit normally operates, and the detected Sti is taken as the distance between the fault point and the transmitting end.
9. The risk potential based power cable fault inspection system according to claim 8, after the central control unit carries out secondary adjustment on the pulse signal transmitted by the transmitting unit, the central control unit operates according to the adjusted pulse signal F2ti, transmitting the adjusted pulse signal F2ti to each power cable Di, obtaining the distances from the fault point to the transmitting end as S2t1, S2t2, S2t3, … and S2tn, wherein S2t1 represents the distance between the fault point and the transmitting end calculated after the first pulse signal F2t1 is introduced into the first power cable D1, S2t2 represents the distance between the fault point and the transmitting end calculated after the second pulse signal F2t2 is introduced into the second power cable D2, S2t3 represents the distance between the fault point and the transmitting end calculated after the third pulse signal F2t3 is introduced into the third power cable D3, and S2tn represents the distance between the fault point and the transmitting end calculated after the nth pulse signal F2t 2tn is introduced into the nth power cable Dn;
the central control unit compares S2t1, S2t2, S2t3, … and S2tn with S0 respectively to obtain absolute difference values S2tc1, S2tc2, S2tc3, … and S2tc, wherein S2tc1 represents the absolute difference value between S2t1 and S0, S2tc2 represents the absolute difference value between S2t2 and S0, S2tc3 represents the absolute difference value between S2t3 and S0, and S2tc represents the absolute difference value between S2tn and S0.
10. The risk potential based power cable fault inspection system according to claim 9,
if the Atx-A2tx is larger than or equal to 5%, the central control unit judges that the signal transmitting unit normally operates, and the detected S2ti is used as the distance between the fault point and the transmitting end;
and if the Atx-A2tx is less than 5%, the central control unit judges that the signal transmitting unit is in operation failure.
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| CN102680855A (en) * | 2012-05-15 | 2012-09-19 | 东南大学 | Cable fault detecting and positioning method based on waveform replication |
| CN103592576B (en) * | 2013-10-24 | 2015-09-30 | 西安理工大学 | Based on anti-theft monitoring positioning system and the monitoring method of the power cable of GIS |
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| CN105510767A (en) * | 2015-11-06 | 2016-04-20 | 中国电子科技集团公司第四十一研究所 | Fault point positioning method for multiple interconnection cables of different types |
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| CN111273129B (en) * | 2020-03-02 | 2021-11-19 | 深圳供电局有限公司 | Cable defect detection method and device based on composite test signal |
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