CN110703035A - Fault location device for power transmission line - Google Patents
Fault location device for power transmission line Download PDFInfo
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- CN110703035A CN110703035A CN201910944782.7A CN201910944782A CN110703035A CN 110703035 A CN110703035 A CN 110703035A CN 201910944782 A CN201910944782 A CN 201910944782A CN 110703035 A CN110703035 A CN 110703035A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention provides a fault positioning device for a power transmission line, wherein a monitoring unit of the fault positioning device is respectively connected with a collecting unit and a monitoring background; the acquisition unit sends the current information to the monitoring unit; the monitoring unit is used for sending information and current information of a fault section to the monitoring background, wherein the signal coupler is arranged on the overhead line, inputting a high-frequency signal to the overhead line through the signal coupler and sending transmission information of the high-frequency signal to the monitoring background; and the monitoring background identifies and displays information of fault points, fault types and fault intervals. The method can accurately position the fault section and determine the position of the fault point on the overhead line, thereby quickly positioning the fault, reducing the consumed manpower and the load of line patrol on one hand, accelerating the speed of restoring power supply of the line and reducing the economic loss caused by power failure on the other hand.
Description
Technical Field
The invention relates to the field of transmission line faults, in particular to a fault positioning device for a transmission line.
Background
With the rapid development of power systems, the power transmission line develops a cable-overhead line hybrid power transmission line on the basis of the original cable and overhead power transmission line, and the application is more and more extensive. The ultra-high voltage cable-overhead line hybrid line can span large water channels and straits and can directly supply power to centers of large cities and industrial areas. Meanwhile, due to the limitation of urban space and planning, the cable-overhead hybrid line is more and more widely applied in cities. The cable-overhead line hybrid line is also applied to low-current power transmission systems with neutral points not directly grounded, such as railway signal power supply systems.
However, due to manufacturing defects or use over time, the insulation level of the power transmission cable in the cable-overhead line may decrease, thereby causing a ground fault in the cable, and likewise, a fault in the overhead line. In daily life and work, whether the cable-overhead line can quickly determine a fault section after a fault so as to recover power supply is often related to whether the daily life and work of people can be carried out in order.
In the prior art, the method for determining the fault section is usually manual line patrol, the method consumes a large amount of manpower, the line patrol burden of maintenance personnel is easily increased, the fault section cannot be determined quickly, the speed of line power restoration is low, and a large amount of economic loss is caused.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a fault positioning device for a power transmission line, which can accurately position a fault section and determine the position of a fault point on an overhead line, so that fault positioning can be rapidly carried out, on one hand, the consumed manpower can be reduced, the load of line patrol is reduced, on the other hand, the speed of line power restoration can be increased, and the economic loss caused by power failure is reduced.
In order to solve the above problems, the present invention adopts a technical solution as follows: a fault positioning device for a power transmission line, wherein the power transmission line is a cable-overhead line, the fault positioning device comprises a plurality of acquisition units, monitoring units and a monitoring background, and the monitoring units are respectively connected with the acquisition units and the monitoring background;
the acquisition unit is respectively connected with a transmission cable and an overhead line, acquires current information of the transmission cable and the overhead line and sends the current information to the monitoring unit;
the monitoring unit comprises a first monitoring unit and a second monitoring unit, the first monitoring unit and the second monitoring unit are respectively connected with different acquisition units, the monitoring unit determines information of a fault section according to the current information and sends the information of the fault section and the current information to a monitoring background, wherein the first monitoring unit further comprises a signal coupler, the signal coupler is arranged on the overhead line, when the first monitoring unit determines that the fault section is the overhead line, a high-frequency signal is input to the overhead line through the signal coupler, and the first monitoring unit and the second monitoring unit acquire transmission information of the high-frequency signal on the overhead line and send the transmission information to the monitoring background;
and the monitoring background receives the information transmitted by the monitoring unit, identifies and displays the information of the fault point, the fault type and the fault interval according to the information, and sends the information to a specified mobile terminal.
Furthermore, the acquisition unit comprises a first current sensor and a second current sensor, the first current sensor and the second current sensor are respectively connected with the power transmission cable and the overhead line, and the insulation sheath grounding current of the power transmission cable and the line current of the overhead line are respectively acquired through the first current sensor and the second current sensor.
Further, the first current sensor is a grounding current transformer, and the second current sensor is a high-frequency rogowski coil.
Further, first monitoring unit and second monitoring unit include power module, collection module, host system and communication module, host system respectively with power module, collection module and communication module connect, host system with collection module passes through power module acquires operating current, host system passes through communication module with the information interaction is realized to the control backstage, and pass through when signal coupler sends high frequency signal collection module gathers high frequency signal and reflection signal in the overhead line, and will high frequency signal and reflection signal send for the control backstage through communication module.
Furthermore, the power supply module comprises a current sensing power supply, a power management chip and a super capacitor, the power management circuit is respectively connected with the current sensing power supply and the super capacitor, the current sensing power supply is arranged on the cable-overhead line, and the power management circuit transmits the current output by the current sensing power supply and stores the current through the super capacitor so as to supply power to the monitoring unit through the super capacitor.
Furthermore, the power supply module further comprises a solar panel and a solar charging management chip, wherein the solar charging management chip is respectively connected with the super capacitor and the solar panel, and the current output by the solar panel is transmitted to the super capacitor through the solar charging management chip.
Furthermore, the first monitoring unit further comprises a digital-to-analog converter and a signal amplifier, the signal amplifier is respectively connected with the digital-to-analog converter and the signal coupler, the main control module is connected with the digital-to-analog converter, the main control module outputs a high-frequency signal through the digital-to-analog converter, and the high-frequency signal is amplified by the signal amplifier and then output to the signal coupler.
Furthermore, the acquisition module comprises a first analog-to-digital converter, a second analog-to-digital converter and an FPGA, the FPGA is connected with the acquisition unit through the first analog-to-digital converter and the second analog-to-digital converter, and when a signal coupler inputs a high-frequency signal to the overhead line, the FPGA drives the first analog-to-digital converter and the second analog-to-digital converter to perform six-path synchronous acquisition so as to acquire the high-frequency signal and a reflection signal.
Further, the main control module comprises a main control chip, a Cortex-A9 framework is adopted, and the main control chip is a single chip microcomputer.
Further, the first monitoring unit and the second monitoring unit synchronize clocks through a GPS.
Compared with the prior art, the invention has the beneficial effects that: the method can accurately position the fault section and determine the position of the fault point on the overhead line so as to quickly position the fault, on one hand, the consumed manpower can be reduced, the burden of line patrol is reduced, on the other hand, the speed of line power restoration can be increased, and the economic loss caused by power failure is reduced.
Drawings
Fig. 1 is a block diagram of an embodiment of a fault locating device for a power transmission line according to the present invention;
fig. 2 is a device connection diagram of an embodiment of the fault locating device for a power transmission line of the present invention;
FIG. 3 is a block diagram of one embodiment of a power module of the fault locating device for a power transmission line of the present invention;
fig. 4 is a connection diagram of an embodiment of a master control module and a signal coupler in the fault location device for a power transmission line according to the present invention;
fig. 5 is a structural diagram of an embodiment of an acquisition module in the fault location device for a power transmission line according to the present invention;
fig. 6 is a structural diagram of an embodiment of a main control module in the fault location device for a power transmission line according to the present invention.
In the figure: 1. a collection unit; 2. a power transmission cable; 3. a monitoring unit; 4. monitoring a background; 5. an overhead line; 31. a first monitoring unit; 32. a second monitoring unit; 11. a first current sensor; 12. a second current sensor; 301. a current sensing power supply; 302. a power management chip; 303. a super capacitor; 304. a solar panel; 305. a solar charging management chip; 306. a digital-to-analog converter; 307. a signal amplifier; 311. a signal coupler; 308. a first analog-to-digital converter; 309. an FPGA; 310. a second analog-to-digital converter; 312. a main control chip; 313. a power management component; 314. a storage component; 315. an expert diagnostic repository; 316. a GPS synchronization component; 30. a power supply module; 33. and a main control module.
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.
Referring to fig. 1-6, wherein fig. 1 is a structural diagram of an embodiment of a fault location device for a power transmission line according to the present invention; fig. 2 is a device connection diagram of an embodiment of the fault locating device for a power transmission line of the present invention; FIG. 3 is a block diagram of one embodiment of a power module of the fault locating device for a power transmission line of the present invention; fig. 4 is a connection diagram of an embodiment of a master control module and a signal coupler in the fault location device for a power transmission line according to the present invention; fig. 5 is a structural diagram of an embodiment of an acquisition module in the fault location device for a power transmission line according to the present invention; fig. 6 is a structural diagram of an embodiment of a main control module in the fault location device for a power transmission line according to the present invention. The fault locating device for a transmission line of the present invention will be described in detail with reference to fig. 1 to 6.
In this embodiment, the fault locating device includes a plurality of collecting units 1, a monitoring unit 3 and a monitoring background 4, wherein the monitoring unit 3 is respectively connected with the collecting units 1 and the monitoring background 4; the acquisition unit 1 is respectively connected with the power transmission cable 2 and the overhead line 5, and the acquisition unit 1 acquires current information of the power transmission cable 2 and the overhead line 5 and sends the current information to the monitoring unit 3; the monitoring unit 3 comprises a first monitoring unit 31 and a second monitoring unit 32, the first monitoring unit 31 and the second monitoring unit 32 are respectively connected with different acquisition units 1, the monitoring unit 3 determines information of a fault interval according to the current information and sends the information of the fault interval and the current information to the monitoring background 4, wherein the first monitoring unit 31 further comprises a signal coupler 311, the signal coupler 311 is arranged on the overhead line 5, when the first monitoring unit 31 determines that the fault interval is the overhead line 5, a high-frequency signal is input to the overhead line 5 through the signal coupler 311, and the first monitoring unit 31 and the second monitoring unit 32 acquire transmission information of the high-frequency signal on the overhead line 5 and send the transmission information to the monitoring background 4; and the monitoring background 4 receives the information transmitted by the monitoring unit 3, identifies and displays the information of the fault point, the fault type and the fault interval according to the information, and sends the information to the specified mobile terminal.
In this embodiment, the monitoring unit 3 may determine that the line fault occurs on the side of the power transmission cable 2 or the side of the overhead line 5 by using methods such as an expert library algorithm, a current variation curve, a traveling wave positioning algorithm, and a partial discharge positioning algorithm, so as to determine a fault section.
In this embodiment, the transmission information is a high-frequency signal in the overhead line 5 and a reflected signal generated when the high-frequency signal encounters a fault point, and the monitoring back-stage 4 performs fault location according to the time when the reflected signal generated when the fault occurs reaches the first monitoring unit 31 and the second monitoring unit 32 and the propagation speed of the reflected signal in the line.
In this embodiment, the frequency of the high-frequency signal may be set according to the user's requirement, and only the fault point may be identified by the high-frequency signal, which is not limited herein.
In this embodiment, the acquisition unit 1 includes a first current sensor 11 and a second current sensor 12, the first current sensor 11 and the second current sensor 12 are respectively connected to the power transmission cable 2 and the overhead wire 5, and the acquisition unit 1 respectively obtains the insulation sheath ground current of the power transmission cable 2 and the line current of the overhead wire 5 through the first current sensor 11 and the second current sensor 12.
In a specific embodiment, the first current sensor 11 and the second current sensor 12 are respectively installed on the ground wire of the insulating sheath of each phase of the power transmission cable 2 and the circuit of each phase of the overhead wire 5, the first current sensor 11 and the second current sensor 12 are adaptive to the magnitude of the line load current, and synchronously acquire the line load current of the overhead wire 5 and the ground current of the insulating sheath of the power transmission cable 2, single-phase ground fault characteristic data and map information when a line fault occurs, and send the information to the monitoring unit 3. The short circuit, grounding, high temperature, low battery voltage and other acquisition information acquired by the acquisition unit 1 are uploaded to the monitoring background 4 through the monitoring unit 3, and SOE recording is carried out to support fault recording. The acquisition unit 1 and the monitoring background 4 support an internal communication protocol, and a user can remotely check and modify related parameters of the acquisition unit 1 and remotely upgrade the acquisition unit 1 through the monitoring background 4 so as to facilitate remote maintenance.
In a specific embodiment, the first current sensor 11 is a grounded current transformer and the second current sensor 12 is a high frequency rogowski coil.
In this embodiment, the first monitoring unit 31 and the second monitoring unit 32 include a power supply module 30, an acquisition module, a main control module 33 and a communication module, the main control module 33 is respectively connected with the power supply module 30, the acquisition module and the communication module, the main control module 33 and the acquisition module acquire working current through the power supply module 30, the main control module 33 realizes information interaction with the monitoring background 4 through the communication module, and acquires high-frequency signals and reflection signals in the overhead line 5 through the acquisition module when the signal coupler 311 transmits the high-frequency signals, and transmits the high-frequency signals and the reflection signals to the monitoring background 4 through the communication module.
In this embodiment, the communication module is a 4G module, and in other embodiments, the monitoring unit 3 and the monitoring background 4 may also communicate with each other through WiFi, bluetooth, 5G, internet, and the like, which is not limited herein.
In this embodiment, the power supply module 30 of the monitoring unit 3 uses a small current (5A) to obtain power, wherein the power supply module 30 includes a current sensing power supply 301, a power management chip 302 and a super capacitor 303, the power management chip 302 is respectively connected with the current sensing power supply 301 and the super capacitor 303, the current sensing power supply 301 is disposed on a cable-overhead line, and the power management chip 302 transmits a current output by the current sensing power supply 301 to the super capacitor 303 and stores the current in the super capacitor 303, so as to supply power to the monitoring unit 3 through the super capacitor 303.
In the present embodiment, the current sensing power supply 301 is clamped on the power transmission cable 2 or the overhead line 5, and obtains current from the power transmission cable 2 or the overhead line 5 by means of induction power taking, so that interference caused by the need to provide a power supply line for the monitoring unit 3 is avoided.
In other embodiments, the super capacitor 303 may be replaced by a lithium battery or other rechargeable batteries, which only needs to store current and supply power to the monitoring unit 3, and is not limited herein.
In a specific embodiment, the model of the power management chip 302 is BQ33100, and the super capacitor 303 is monitored and managed by the power management chip 302, in other embodiments, the power management chip 302 may also be another chip for managing the super capacitor 303, which is not limited herein.
In this embodiment, the power supply module 30 further includes a solar panel 304 and a solar charging management chip 305, the solar charging management chip 305 is respectively connected to the super capacitor 303 and the solar panel 304, and the current output by the solar panel 304 is transmitted to the super capacitor 303 through the solar charging management chip 305.
In a specific embodiment, the solar charging management chip 305 is a model CN3722, and converts the current output by the solar panel 304 into a current capable of charging the super capacitor 303.
In other embodiments, the solar charging management chip 305 may be of another type, and a current conversion circuit having a similar function to the solar charging management chip may be used to replace the solar charging management chip, as long as the current output by the solar panel 304 can be stored in the super capacitor 303, which is not limited herein.
In other embodiments, the power module 30 may also include a wind power generator, a thermal power generator, and other devices capable of generating electricity from natural energy.
In this embodiment, the first monitoring unit 31 further includes a digital-to-analog converter 306 and a signal amplifier 307, the signal amplifier 307 is respectively connected to the digital-to-analog converter 306 and the signal coupler 311, the main control module 33 is connected to the digital-to-analog converter 306, the main control module 33 outputs a high-frequency signal through the digital-to-analog converter 306, and the high-frequency signal is amplified by the signal amplifier 307 and then output to the signal coupler 311.
The main control module 33 controls the digital-to-analog converter 306 to generate a high-frequency signal required for detecting a fault point of the overhead line 5, and the high-frequency signal is transmitted to the signal coupler 311 through the signal amplifier 307, the signal coupler 311 couples the signal to the overhead line 5, and the high-frequency signal is coupled when the overhead line 5 is in fault, so that the power consumption problem is considered, when the overhead line 5 is not in fault, the main control module 33 or the power supply module 30 does not supply power to the digital-to-analog converter 306, the signal amplifier 307 and the signal coupler 311, and when the main control module 33 determines that the signal coupler 311 is required to couple the high-frequency signal to the overhead line 5, the main control module 33 or the power supply module 30 supplies power to the digital-to-analog converter 306, the signal amplifier 307 and.
In one particular embodiment, the digital to analog converter 306 is of the type DAC 60504.
In this embodiment, the digital-to-analog converter 306 and the signal amplifier 307 are independently disposed, and in other embodiments, the digital-to-analog converter 306 and the signal amplifier 307 may also be collectively disposed in the main control module 33.
In this embodiment, the acquisition module includes a first analog-to-digital converter 308, a second analog-to-digital converter 310, and an FPGA (Field Programmable Gate Array) 309, where the FPGA309 is connected to the acquisition unit 1 through the first analog-to-digital converter 308 and the second analog-to-digital converter 310, and when the signal coupler 311 inputs a high-frequency signal to the overhead line 5, the FPGA309 drives the first analog-to-digital converter 308 and the second analog-to-digital converter 310 to perform six-path synchronous acquisition to acquire the high-frequency signal and the reflected signal, respectively.
The FPGA309 is connected to the first current sensor 11 and the second current sensor 12 through the first analog-to-digital converter 308, and the high-frequency signals in the power transmission cable 2 and the overhead line 5 are synchronously acquired through the first analog-to-digital converter 308. The second analog-to-digital converter 310 is connected to the second current sensor 12 and the first analog-to-digital converter 308, respectively, and identifies and determines the reflection signal according to the time difference and the phase difference of the high-frequency signals sent by the second current sensor 12 and the first analog-to-digital converter 308, so as to collect the reflection signal in the overhead line 5.
In a specific embodiment, the first analog-to-digital converter 308 has a model number AD7606, the second analog-to-digital converter 310 has a model number LTC2325, and the FPGA309 has a model number EP4CE 22.
In the present embodiment, the main control module 33 includes a main control chip 312, a storage component 314, an expert diagnosis library 315, a GPS synchronization component 316, and a power management component 313. The main control module 33 adopts a Cortex-a9 architecture, the main control chip 312 is a single chip microcomputer, the main control chip 312 of the main control module 33 collects current information sent by the acquisition unit 1, the operation condition of the power transmission line is analyzed according to the change of a current signal in the current information, and when the current fault of the overhead line 5 is judged, the signal coupler 311 is started to couple a high-frequency signal to the overhead line 5 through the signal coupler 311.
In this embodiment, the storage component 314 may be a hard disk, an SD card, a memory bank, or other storage devices capable of storing information, and the expert diagnosis library 315 stores therein an algorithm and a current waveform change library for performing fault diagnosis on the cable-overhead line, and analyzes the current information transmitted by the acquisition unit 1 according to the algorithm and the current waveform change library to determine a fault section of the line.
In the above embodiment, the storage component 314, the expert diagnosis library 315, the GPS synchronization component 316, and the power management component 313 may be integrated in the main control chip 312 or partially combined in a device outside the main control chip 312, which is not limited herein.
In this embodiment, the monitoring background 4 is a background server, and the background server collects and integrates information sent by the monitoring unit 3, thereby performing research and judgment on a fault point, a fault type, and a fault section of the cable-overhead line. And the information and the result are displayed or sent to a display terminal connected with the information and the result through a web interface. Meanwhile, the background server can be also associated with the mobile terminal, and sends current change information or fault section information of the cable-overhead line to the mobile terminal according to a preset rule or sends alarm information to the mobile terminal when a fault occurs.
In this embodiment, the monitoring background 4 has a storage system and a diagnosis library, and realizes information collection and comprehensive information judgment through the storage system and the diagnosis library, and the monitoring background 4 can also perform information configuration, account allocation and account management on the monitoring unit 3 and the acquisition unit 1 connected thereto, and also perform information configuration and account management on a mobile terminal associated therewith.
The power supply module 30 of the monitoring unit 3 of the present invention has a large-capacity and long-life lithium subcell or super capacitor 303 built therein. By applying the lithium sub-battery or the super capacitor 303, the visible line power supply module 30 continuously obtains power within the range of 5-600A of line current, the current of the power transmission line can meet the minimum requirements of self-supply operation and power storage only by reaching 5A, and a battery or an external power supply is not needed, so that the service life of a product is effectively prolonged.
The acquisition module adopts a 24-bit high-precision analog-to-digital converter with differential input, calculates the current value through the FFT (fast Fourier transform) of 1024 points, and the FFT (fast Fourier transform) algorithm is a fixed formula algorithm, can sleeve the numerical value acquired by the analog-to-digital converter of 1024 points to directly calculate the current effective value, and improves the acquisition precision.
The signal coupler 311 adopts permalloy iron core and unique winding process, can obtain +/-1% measurement precision within the range of 0-1000A of circuit current and 0-100A of ground current, and can accurately identify the working condition of the circuit. During line fault or calling, the current can be recorded through the monitoring unit 3 and the monitoring background 4 so as to accumulate operation experience and improve continuously.
In this embodiment, the iron core of the signal coupler 311 is made of permalloy, the iron core is divided into two semicircles, the shape of the iron core is circular after combination, the combination position of the semicircles adopts a mirror surface design, so that the iron core is more easily attached, a winding on the iron core adopts a unilateral semicircular winding method, the main control chip 312 directly couples electromagnetic waves with variable frequency to a line through the iron core of the signal coupler 311, and a fault point is determined through information acquisition of the acquisition unit 1 and the acquisition module and analysis of the monitoring background 4.
The specific analysis method is as follows: knowing the transmission rate of the electromagnetic wave, the monitoring background 4 calculates the fault point by capturing the time difference between the incident wave and the reflected wave of the high-frequency signal and the arrival time of the reflected wave at the acquisition module (incident wave time T1, amplitude V1, reflected wave time T2 and amplitude V2, the conduction rate of the electromagnetic wave on the line is 17 m/us and the attenuation is a fixed value, whether the reflected wave is the reflected wave at the end point or the reflected wave at the fault point is determined by V1-V2, and the position of the fault point is calculated by T1-T2.
The incident wave time T1, the intensity V1, the time T3 of reaching the end point and the amplitude V3 can be collected by the collecting modules of the first monitoring unit and the second monitoring unit at two ends, the time T2 of the reflected wave of the fault point reaching the generating device and the intensity V2 can obtain the time us of the position S of the fault point (T2-T1) 17/2T, and the distance unit is meter.
In one specific embodiment, the core of the signal coupler 311 is formed with a circular diameter of 42mm, and has a wall width and a wall thickness of 10 mm.
The first monitoring unit 31 and the second monitoring unit 32 obtain a GPS high precision (1us) time service through the GPS synchronous clock component of the main control module 33 to obtain a precise absolute time scale, so as to keep the time of the two units consistent. The main control module 33 wirelessly synchronizes the acquisition unit 1 for one time every 30 minutes to ensure that the time corresponding to each phase of current information acquired by the acquisition unit 1 is kept the same and maintained at the same precision, thereby realizing the acquisition of the three-phase current and the ground field waveform of the power transmission cable 2.
The acquisition unit 1 and the monitoring unit 3 can run independently after being arranged on a cable-overhead line, and are completely maintenance-free. If necessary, the monitoring background 4 can be used for remotely and wirelessly maintaining the operating parameters of the monitoring background, updating fault criteria or upgrading software programs, and the working efficiency is improved.
Compared with the prior art, the fault positioning device for the power transmission line has the beneficial effects that: the method can accurately position the fault section and determine the position of the fault point on the overhead line so as to quickly position the fault, on one hand, the consumed manpower can be reduced, the burden of line patrol is reduced, on the other hand, the speed of line power restoration can be increased, and the economic loss caused by power failure is reduced.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A fault positioning device for a power transmission line is characterized in that the power transmission line is a cable-overhead line, the fault positioning device comprises a plurality of acquisition units, monitoring units and a monitoring background, and the monitoring units are respectively connected with the acquisition units and the monitoring background;
the acquisition unit is respectively connected with a transmission cable and an overhead line, acquires current information of the transmission cable and the overhead line and sends the current information to the monitoring unit;
the monitoring unit comprises a first monitoring unit and a second monitoring unit, the first monitoring unit and the second monitoring unit are respectively connected with different acquisition units, the monitoring unit determines information of a fault section according to the current information and sends the information of the fault section and the current information to a monitoring background, wherein the first monitoring unit further comprises a signal coupler, the signal coupler is arranged on the overhead line, when the first monitoring unit determines that the fault section is the overhead line, a high-frequency signal is input to the overhead line through the signal coupler, and the first monitoring unit and the second monitoring unit acquire transmission information of the high-frequency signal on the overhead line and send the transmission information to the monitoring background;
and the monitoring background receives the information transmitted by the monitoring unit, identifies and displays the information of the fault point, the fault type and the fault interval according to the information, and sends the information to a specified mobile terminal.
2. A fault location device for a transmission line according to claim 1, wherein said acquisition unit comprises a first current sensor and a second current sensor, said first current sensor and said second current sensor are respectively connected to a transmission cable and an overhead line, and an insulation sheath ground current of said transmission cable and a line current of said overhead line are respectively obtained by said first current sensor and said second current sensor.
3. A fault location device for a power transmission line according to claim 2, said first current sensor being a ground current transformer and said second current sensor being a high frequency rogowski coil.
4. A fault location device for a power transmission line according to claim 1, wherein the first monitoring unit and the second monitoring unit include a power supply module, an acquisition module, a main control module and a communication module, the main control module is respectively connected to the power supply module, the acquisition module and the communication module, the main control module and the acquisition module obtain operating current through the power supply module, the main control module realizes information interaction with the monitoring background through the communication module, and acquires high-frequency signals and reflected signals in an overhead line through the acquisition module when the signal coupler transmits the high-frequency signals, and transmits the high-frequency signals and the reflected signals to the monitoring background through the communication module.
5. A fault location device for a transmission line according to claim 4, wherein said power supply module comprises a current sensing power supply, a power management chip and a super capacitor, said power management circuit is connected to said current sensing power supply and said super capacitor respectively, said current sensing power supply is disposed on said cable-overhead line, said power management circuit transmits the current outputted by said current sensing power supply and stores said current through said super capacitor to supply power to said monitoring unit through said super capacitor.
6. The device of claim 5, wherein the power module further comprises a solar panel and a solar charging management chip, the solar charging management chip is connected to the super capacitor and the solar panel, respectively, and the solar charging management chip transmits the current output by the solar panel to the super capacitor.
7. The apparatus according to claim 4, wherein the first monitoring unit further comprises a digital-to-analog converter and a signal amplifier, the signal amplifier is respectively connected to the digital-to-analog converter and the signal coupler, the main control module is connected to the digital-to-analog converter, the main control module outputs a high-frequency signal through the digital-to-analog converter, and the high-frequency signal is amplified by the signal amplifier and then output to the signal coupler.
8. The fault location device for the transmission line according to claim 4, wherein the acquisition module comprises a first analog-to-digital converter, a second analog-to-digital converter and an FPGA, the FPGA is connected with the acquisition unit through the first analog-to-digital converter and the second analog-to-digital converter, and when the signal coupler inputs a high-frequency signal to the overhead line, the FPGA drives the first analog-to-digital converter and the second analog-to-digital converter to perform six-path synchronous acquisition so as to acquire the high-frequency signal and a reflected signal.
9. The fault locating device for the power transmission line according to claim 4, wherein the main control module comprises a main control chip, a Cortex-A9 architecture is adopted, and the main control chip is a single chip microcomputer.
10. A fault location device for a transmission line according to claim 1, characterized in that said first monitoring unit and said second monitoring unit synchronize clocks by means of GPS.
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| CN201910944782.7A CN110703035A (en) | 2019-09-30 | 2019-09-30 | Fault location device for power transmission line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406436A (en) * | 2021-06-17 | 2021-09-17 | 山东大学 | Traveling wave fault location method and system for alternating-current and direct-current transmission line based on 5G communication |
| CN114034965A (en) * | 2021-09-27 | 2022-02-11 | 杭州柯林电气股份有限公司 | Non-contact power transmission line fault section positioning method and system |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113406436A (en) * | 2021-06-17 | 2021-09-17 | 山东大学 | Traveling wave fault location method and system for alternating-current and direct-current transmission line based on 5G communication |
| CN114034965A (en) * | 2021-09-27 | 2022-02-11 | 杭州柯林电气股份有限公司 | Non-contact power transmission line fault section positioning method and system |
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