CN111537834A - Cable fault positioning online monitoring device and method - Google Patents
Cable fault positioning online monitoring device and method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
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- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
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Abstract
The invention provides a cable fault positioning online monitoring device which comprises a traveling wave current sensor, a power-taking current sensor, a monitoring terminal, a communication module and a background terminal, wherein the traveling wave current sensor and the power-taking current sensor are installed on a cable to be detected, the traveling wave current sensor and the power-taking current sensor are both connected with the monitoring terminal, the monitoring terminal is connected with the background terminal through the communication module, the monitoring terminal comprises an ARM processor and a DSP chip, the ARM processor is connected with the DSP chip, the communication module is respectively connected with the ARM processor and the background terminal, the ARM processor is connected with the background terminal through the communication module, and the DSP chip is connected with the traveling wave current sensor. According to the cable fault positioning online monitoring device, the ARM processor and the DSP chip are used for processing and acquiring current data, so that the high efficiency of the operation efficiency and the stability of the performance of the cable fault positioning online monitoring device are guaranteed.
Description
Technical Field
The invention relates to the field of cable monitoring, in particular to a cable fault positioning online monitoring device and method.
Background
In an electric power system, a power cable, which is a primary device for transmitting and distributing electric energy, is prone to malfunction due to external natural conditions during use. As the scale of power cable usage in power systems increases, the need to accurately find the location of a cable fault is more and more urgent. At present, most of mainstream cable insulation and fault monitoring methods are offline monitoring during cable maintenance, and real-time online monitoring cannot be achieved, so that the cable fault is not timely and effectively processed.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the objectives of the present invention is to provide an online cable fault location monitoring device, which can solve the problem that the existing mainstream cable insulation and fault monitoring methods mostly perform offline monitoring during cable maintenance and cannot perform real-time online monitoring, so that the cable fault is not processed timely and effectively.
The invention also aims to provide a cable fault positioning online monitoring method, which can solve the problem that the existing mainstream cable insulation and fault monitoring method is mainly used for offline monitoring during cable maintenance and cannot realize real-time online monitoring, so that the cable fault is not processed timely and effectively.
One of the purposes of the invention is realized by adopting the following technical scheme:
the utility model provides a cable fault location on-line monitoring device, includes travelling wave current sensor, gets electric current sensor, monitor terminal, communication module and backstage terminal, travelling wave current sensor with get electric current sensor and install on the cable that awaits measuring, travelling wave current sensor with get electric current sensor all with monitor terminal connects, monitor terminal passes through communication module with backstage terminal connects, monitor terminal includes ARM treater and DSP chip, the ARM treater with the DSP chip is connected, communication module respectively with the ARM treater with backstage terminal connects, the ARM treater passes through communication module with backstage terminal connects, the DSP chip with the travelling wave current sensor is connected.
Further, still include GPS to the time device, GPS to the time device with the DSP chip is connected, the ARM treater is connected with temperature sensor, level sensor and the vibrations sensor of installing on the cable that awaits measuring.
Furthermore, the ARM processor comprises a charging interface, and the electricity-taking current sensor is connected to the charging interface to supply power to the ARM processor.
Furthermore, the working bandwidth of the traveling wave current sensor is 10 Hz-100 MHz.
The second purpose of the invention is realized by adopting the following technical scheme:
a cable fault location online monitoring method is applied to a cable fault location online monitoring device in the application, and comprises the following steps:
acquiring current data, wherein the current data of a cable to be detected is acquired by a traveling wave current sensor in real time, and the current data comprises a cable power frequency current signal;
judging faults, namely judging whether the cable to be detected has faults or not according to the current data, if so, acquiring a cable high-frequency current signal of the cable to be detected acquired by the traveling wave current sensor in real time and executing a threshold value judging step, and if not, returning to the step of executing the current data acquisition;
judging a threshold value, namely judging whether a cable high-frequency current value corresponding to the cable high-frequency current signal exceeds a preset high-frequency current threshold value, if so, executing a fault position positioning step, otherwise, judging that the cable to be detected is disturbed, and returning to execute the current data acquiring step;
positioning a fault position, and calculating the fault position according to the cable high-frequency current signal and a traveling wave positioning principle;
and position sending, namely sending the fault position to a background terminal.
Further, the locating the fault location specifically includes:
extracting characteristic quantity, namely extracting the characteristic quantity of the cable high-frequency current signal and reconstructing the cable high-frequency current signal to obtain cable high-frequency current traveling wave data;
calculating wave speed, namely obtaining a traveling wave path according to the cable high-frequency current traveling wave data, and calculating the wave speed according to the traveling wave path;
and calculating the fault position, namely extracting a maximum digital module value and a corresponding maximum digital module value moment in the cable high-frequency current traveling wave data by adopting a wavelet conversion method, and obtaining the fault position according to the wave speed, the maximum digital module value and the maximum digital module value moment.
And further, acquiring temperature information of the cable to be detected, cable vibration information of the cable to be detected and water level information around the cable to be detected, judging the running state of the cable to be detected according to the temperature information of the cable to be detected, the cable vibration information of the cable to be detected and the water level information around the cable to be detected, and sending the running state to the background terminal.
Further, the position sending also comprises sending an alarm signal to the background terminal.
Further, the specifically determining whether the cable to be tested fails according to the current data includes: and judging whether the power frequency current value of the cable corresponding to the power frequency current signal of the cable exceeds a preset power frequency current threshold value, if so, judging that the cable breaks down, and if not, judging that the cable breaks down.
Compared with the prior art, the invention has the beneficial effects that: the utility model provides a cable fault location on-line monitoring device, including the travelling wave current sensor, get electric current sensor, monitor terminal, communication module and backstage terminal, travelling wave current sensor installs on the cable that awaits measuring with getting electric current sensor, travelling wave current sensor all is connected with monitor terminal with getting electric current sensor, monitor terminal passes through communication module and backstage terminal connection, monitor terminal includes ARM treater and DSP chip, the ARM treater is connected with the DSP chip, communication module respectively with ARM treater and backstage terminal connection, the ARM treater passes through communication module and backstage terminal connection, the DSP chip is connected with travelling wave current sensor. The position of the cable to be detected when a local fault or a fault occurs is monitored on line through the monitoring terminal, and the high efficiency and the performance stability of the operation efficiency of the cable fault positioning on-line monitoring device are ensured by processing and acquiring current data through the ARM processor and the DSP chip.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a block diagram of a cable fault location online monitoring device according to the present invention;
FIG. 2 is a schematic flow chart of a cable fault location online monitoring method according to the present invention;
FIG. 3 is an exemplary diagram of a method for monitoring cable fault location on-line according to the present invention, wherein the fault location is calculated by using the traveling wave single-ended distance measurement principle;
fig. 4 is an exemplary diagram of calculating a fault location by using a traveling wave double-end ranging principle in the cable fault location online monitoring method according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
As shown in fig. 1, the present embodiment provides an online cable fault location monitoring device, which includes a traveling wave current sensor, a power-taking current sensor, a monitoring terminal, a communication module, and a background terminal; travelling wave current sensor with get electric current sensor and install on the cable that awaits measuring, travelling wave current sensor with get electric current sensor all with monitor terminal connects, monitor terminal passes through communication module with backstage terminal connects, monitor terminal includes ARM treater and DSP chip, the ARM treater with the DSP chip is connected, communication module respectively with the ARM treater with backstage terminal connects, the ARM treater passes through communication module with backstage terminal connects, the DSP chip with travelling wave current sensor connects. In this embodiment, still include GPS to the time device, GPS to the time device with the DSP chip is connected, the ARM treater is connected with temperature sensor, level sensor and the vibrations sensor of installing on the cable that awaits measuring. The ARM processor comprises a charging interface, and the electricity-taking current sensor is connected to the charging interface to supply power to the ARM processor. The working bandwidth of the traveling wave current sensor in the embodiment is 10Hz to 100 MHz. In this embodiment, the DSP chip refers to a chip capable of implementing a digital signal processing technique. ARM (advanced RISC machines) is a 32-bit Reduced Instruction Set (RISC) processor architecture, which is widely used in many embedded system designs, and has the characteristics of fixed instruction length, high execution efficiency, low cost and the like. The communication module is a wired module or a wireless module.
In the working process, the traveling wave current sensor collects current data of the cable to be measured in real time, wherein the current data comprise a cable power frequency current signal. The method comprises the steps that a DSP chip acquires current data of a cable to be measured collected by a traveling wave current sensor in real time, and when the DSP receives the current data, a GPS time synchronization device records a time tag corresponding to the current data; and the DSP chip incorporates a time tag into the current data and sends the current data to the ARM processor. The ARM processor judges whether the cable to be detected breaks down or not according to current data, if the cable to be detected breaks down, when the current data is a cable power frequency current signal and a cable power frequency current value corresponding to the cable power frequency current signal exceeds a preset power frequency current threshold value, the cable to be detected breaks down, at the moment, the traveling wave current sensor is obtained to collect a cable high-frequency current signal of the cable to be detected in real time, and a fault position is calculated according to the cable high-frequency current signal and a traveling wave positioning principle; and the ARM processor sends the obtained fault position to a background terminal. In this embodiment, the ARM processor may further send an alarm signal to the background terminal, and the background terminal performs accurate maintenance on the cable according to the alarm signal and the obtained fault location. In this embodiment, the cable to be measured is a three-phase cable, and in this embodiment, three identical traveling wave current sensors may be arranged to monitor current data on three lines, respectively.
As shown in fig. 2, the present embodiment provides an online cable fault location monitoring method, which is applied to the online cable fault location monitoring apparatus, and specifically includes the following steps:
acquiring current data, and acquiring current data of a cable to be detected acquired by a traveling wave current sensor in real time, wherein the current data comprises a cable power frequency current signal. In this embodiment, the DSP chip obtains current data of the cable to be measured, which is collected by the traveling wave current sensor in real time, the current data is a cable power frequency current signal, and when the current data is received, the GPS time-alignment device connected to the DSP chip sets a corresponding time tag for the current data at that time, that is, a time for receiving the current data.
And judging the fault, namely judging whether the cable to be detected has the fault according to the current data, if so, acquiring a cable high-frequency current signal of the cable to be detected acquired by the traveling wave current sensor in real time and executing a threshold value judging step, and if not, returning to the step of acquiring the current data. In this embodiment, whether the cable has a fault is determined, that is, whether the power frequency current value of the cable corresponding to the power frequency current signal of the cable exceeds a preset power frequency current threshold value, if so, the cable has a fault, and if not, the cable does not have a fault.
And judging a threshold value, namely judging whether a cable high-frequency current value corresponding to the cable high-frequency current signal exceeds a preset high-frequency current threshold value, if so, executing a fault position positioning step, otherwise, judging that the cable to be detected is a disturbance, wherein the disturbance is a transient state in the embodiment, the cable to be detected does not have a fault and does not need to be processed, and at the moment, returning to execute the current data acquiring step.
And positioning the fault position, and calculating the fault position according to the cable high-frequency current signal and the traveling wave positioning principle. In this embodiment, locating the fault location includes the following substeps:
extracting characteristic quantity, namely extracting the characteristic quantity of the cable high-frequency current signal and reconstructing the cable high-frequency current signal to obtain cable high-frequency current traveling wave data; in this embodiment, the characteristic quantity is a value showing a characteristic of a cable high-frequency current traveling wave after filtering an original cable high-frequency current signal, removing signal noise and interference, and the value is converted into an identifiable signal, that is, signal reconstruction, and the reconstructed signal is a signal showing a cable fault characteristic with noise completely removed.
And calculating the wave velocity, namely obtaining a traveling wave path according to the cable high-frequency current traveling wave data, and calculating the wave velocity according to the traveling wave path.
And calculating the fault position, namely extracting a maximum digital module value and a corresponding maximum digital module value moment in the cable high-frequency current traveling wave data by adopting a wavelet conversion method, and obtaining the fault position according to the wave speed, the maximum digital module value and the maximum digital module value moment.
In this embodiment, the above-mentioned wave velocity calculation and fault location calculation are described and exemplified by information: the medium-cable high-frequency current traveling wave data comprise a round-trip propagation path of a traveling wave between an initial substation and a target substation and the time of the traveling wave passing through a monitoring point, so that the traveling wave path can be obtained according to the cable high-frequency current traveling wave data, the wave speed is calculated according to the traveling wave path and preset position data, in the transmission process of the cable to be detected, the cable transmits electricity of one substation to the other substation, the preset position data comprise the distance between the two substations, in addition, the installation position of the online monitoring device is determined, namely the preset position data comprise the monitoring point position, the distance between the monitoring point and the initial substation is known, and the distance between the monitoring point and the target substation can also be obtained through measurement in advance; therefore, the preset position data comprises the distance between the monitoring point and the initial substation and the distance between the monitoring point and the target substation, and when the number of the monitoring points is two, the preset position data comprises the distance between the two monitoring points, the distance between one monitoring point and the initial substation and the distance between the other monitoring point and the target substation. The cable high-frequency current traveling wave data in this embodiment contains the reconstructed cable high-frequency current traveling wave and the time tag. In this embodiment, the position of the wave velocity and the position of the release point are calculated according to the traveling wave positioning principle by combining the wave velocity path and the preset position data: according to the different number of monitoring points, the calculation principle can be divided into the following two categories:
firstly, when one monitoring point is used, the principle of traveling wave single-end distance measurement is adopted; specifically, with reference to fig. 3, the following is illustrated: assuming that the initial substation is substation a in fig. 3, the target substation is substation B in fig. 3, M is a monitoring point, and F is a fault position, the distance between the monitoring point M and the substation a is L1The distance between the monitoring point and the substation B is L2At the moment, a fault occurs at the F point between the transformer substation A and the monitoring point M, and t0The time when the fault occurs, namely the time when the current data containing the cable high-frequency current signal is received, namely the time tag; t is t1When a fault occurs, the high-frequency current traveling wave of the cable reaches a monitoring point M when being transmitted from the transformer substation A to the transformer substation B; t is t3Reflecting the moment when the cable high-frequency current traveling wave reaches the monitoring point M for the transformer substation B; t is t2And the time when the cable high-frequency current traveling wave reaches the monitoring point M after being transmitted and reflected by the transformer substation A. The wave velocity is shown in equation (1):
wherein v is the wave velocity, t1The time when the cable high-frequency current traveling wave reaches the monitoring point M when being transmitted from the transformer substation A to the transformer substation B; l is2The distance between a monitoring point M and a transformer substation B; t is t3And reflecting the moment when the cable high-frequency current traveling wave reaches the monitoring point M for the substation B.
In the embodiment, a wavelet conversion method is adopted to extract a maximum modulus value and a corresponding maximum modulus value moment in cable high-frequency current traveling wave data, and a fault position is obtained according to the wave speed, the maximum modulus value and the maximum modulus value moment; specifically, as shown in formula (2):
wherein x is1Distance, x, of fault location F from substation A2The distance between the placing point position F and the monitoring point M is obtained; l is1For monitoring the distance of point M from substation A, known L1＝x1+x2(ii) a v is the wave velocity; t is t2The time when the cable high-frequency current traveling wave reaches a monitoring point M after being transmitted and reflected by the transformer substation A is shown; t is t1And the time when the cable high-frequency current traveling wave reaches the monitoring point M when the cable high-frequency current traveling wave is transmitted from the transformer substation A to the transformer substation B. X can be calculated according to the above formula (2)1And x2And the position relation between the fault position F and the transformer substation A and the monitoring point M is obtained, so that the specific information of the fault position is obtained. In this example L1Is a maximum modulus value, t2The corresponding maximum modulo time.
Secondly, when the number of the monitoring points is two, the principle of double-end distance measurement of the traveling wave is obtained; specifically, the following is illustrated with reference to fig. 4: assuming that the initial substation is substation a in fig. 4 and the target substation is substation B in fig. 4, M and N are both monitoring points, F is a fault position, the fault position is between the two monitoring points, the distance between monitoring point M and substation a is L1, the distance between monitoring point N and substation B is L2, the distance between monitoring point M and monitoring point N is L, t is0To send outThe time of generating the fault, namely the time corresponding to the current data containing the cable high-frequency current signal, namely the time tag; t is t1When a fault occurs, the high-frequency current traveling wave of the cable reaches a monitoring point M when being transmitted from the transformer substation B to the transformer substation A; t is t3Reflecting the moment when the cable high-frequency current traveling wave reaches the monitoring point M for the transformer substation A; t is t2The time when the cable high-frequency current traveling wave reaches the monitoring point N after being transmitted and reflected by the transformer substation B; t is t4And the time when the cable high-frequency current traveling wave reaches the monitoring point N after being reflected by the transformer substation B. As shown in FIG. 4, assume t2＞t1When the traveling wave is considered to have the same speed in both directions, the wave speed is as shown in formula (3):
wherein v is the wave velocity, t1The time when the cable high-frequency current traveling wave reaches the monitoring point M when being transmitted from the transformer substation A to the transformer substation B; t is t2The time when the cable high-frequency current traveling wave reaches the monitoring point N after being transmitted and reflected by the transformer substation B; t is t3Reflecting the moment when the cable high-frequency current traveling wave reaches the monitoring point M for the transformer substation A; t is t4The time when the cable high-frequency current traveling wave reaches the monitoring point N after being reflected by the transformer substation B; l is1The distance between a monitoring point M and the transformer substation A is obtained; l is2The distance between a measuring point N and a transformer substation B is calculated;
in the embodiment, a wavelet conversion method is adopted to extract a maximum modulus value and a corresponding maximum modulus value moment in cable high-frequency current traveling wave data, and a fault position is obtained according to the wave speed, the maximum modulus value and the maximum modulus value moment; specifically, as shown in formula (4):
wherein x is1Distance, x, of fault location F from monitoring point M2The distance between the placing point position F and the monitoring point N is obtained; l is the distance between the monitoring point M and the monitoring point N; v is the wave velocity; l ═ x1+x2(ii) a X can be calculated according to the above formula (4)1And x2And the position relation between the fault position F and the monitoring points N and M is obtained, so that the specific information of the fault position is obtained. L in formula (4) is a maximum modulus value, and t in formula (4)2-t1The corresponding maximum modulo time.
And position sending, namely sending the fault position to a background terminal.
The utility model provides a cable fault location on-line monitoring device, including the travelling wave current sensor, get electric current sensor, monitor terminal, communication module and backstage terminal, travelling wave current sensor installs on the cable that awaits measuring with getting electric current sensor, travelling wave current sensor all is connected with monitor terminal with getting electric current sensor, monitor terminal passes through communication module and backstage terminal connection, monitor terminal includes ARM treater and DSP chip, the ARM treater is connected with the DSP chip, communication module respectively with ARM treater and backstage terminal connection, the ARM treater passes through communication module and backstage terminal connection, the DSP chip is connected with travelling wave current sensor. The position of the cable to be detected when a local fault or a fault occurs is monitored on line through the monitoring terminal, and the high efficiency and the performance stability of the operation efficiency of the cable fault positioning on-line monitoring device are ensured by processing and acquiring current data through the ARM processor and the DSP chip.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; those skilled in the art can readily practice the invention as shown and described in the drawings and detailed description herein; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (9)
1. The utility model provides a cable fault location on-line monitoring device which characterized in that: including travelling wave current sensor, getting electric current sensor, monitor terminal, communication module and backstage terminal, travelling wave current sensor with get electric current sensor and install on the cable that awaits measuring, travelling wave current sensor with get electric current sensor all with monitor terminal connects, monitor terminal passes through communication module with backstage terminal connects, monitor terminal includes ARM treater and DSP chip, the ARM treater with the DSP chip is connected, communication module respectively with the ARM treater with backstage terminal connects, the ARM treater passes through communication module with backstage terminal connects, the DSP chip with travelling wave current sensor connects.
2. The cable fault location on-line monitoring device of claim 1, wherein: still include GPS to the time device, GPS to the time device with the DSP chip is connected, the ARM treater is connected with temperature sensor, level sensor and the vibrations sensor of installing on the cable that awaits measuring.
3. The cable fault location on-line monitoring device of claim 1, wherein: the ARM processor comprises a charging interface, and the electricity-taking current sensor is connected to the charging interface to supply power to the ARM processor.
4. The cable fault location on-line monitoring device of claim 1, wherein: the working bandwidth of the traveling wave current sensor is 10 Hz-100 MHz.
5. An on-line cable fault location monitoring method applied to the on-line cable fault location monitoring device of any one of claims 1 to 4, wherein the method comprises the following steps: the method comprises the following steps:
acquiring current data, wherein the current data of a cable to be detected is acquired by a traveling wave current sensor in real time, and the current data comprises a cable power frequency current signal;
judging faults, namely judging whether the cable to be detected has faults or not according to the current data, if so, acquiring a cable high-frequency current signal of the cable to be detected acquired by the traveling wave current sensor in real time and executing a threshold value judging step, and if not, returning to the step of executing the current data acquisition;
judging a threshold value, namely judging whether a cable high-frequency current value corresponding to the cable high-frequency current signal exceeds a preset high-frequency current threshold value, if so, executing a fault position positioning step, otherwise, judging that the cable to be detected is disturbed, and returning to execute the current data acquiring step;
positioning a fault position, and calculating the fault position according to the cable high-frequency current signal and a traveling wave positioning principle;
and position sending, namely sending the fault position to a background terminal.
6. The cable fault location on-line monitoring method of claim 5, wherein: the positioning of the fault location specifically includes:
extracting characteristic quantity, namely extracting the characteristic quantity of the cable high-frequency current signal and reconstructing the cable high-frequency current signal to obtain cable high-frequency current traveling wave data;
calculating wave speed, namely obtaining a traveling wave path according to the cable high-frequency current traveling wave data, and calculating the wave speed according to the traveling wave path;
and calculating the fault position, namely extracting a maximum digital module value and a corresponding maximum digital module value moment in the cable high-frequency current traveling wave data by adopting a wavelet conversion method, and obtaining the fault position according to the wave speed, the maximum digital module value and the maximum digital module value moment.
7. The cable fault location on-line monitoring method of claim 5, wherein: the method comprises the steps of obtaining temperature information of a cable to be detected, cable vibration information of the cable to be detected and water level information around the cable to be detected, judging the running state of the cable to be detected according to the temperature information of the cable to be detected, the cable vibration information of the cable to be detected and the water level information around the cable to be detected, and sending the running state to a background terminal.
8. The cable fault location on-line monitoring method of claim 5, wherein: the position sending also comprises sending an alarm signal to the background terminal.
9. The cable fault location on-line monitoring method of claim 5, wherein: the specific steps of judging whether the cable to be tested breaks down according to the current data are as follows: and judging whether the power frequency current value of the cable corresponding to the power frequency current signal of the cable exceeds a preset power frequency current threshold value, if so, judging that the cable breaks down, and if not, judging that the cable breaks down.
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