CN211237053U - Power cable prevents destroying early warning system - Google Patents
Power cable prevents destroying early warning system Download PDFInfo
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- CN211237053U CN211237053U CN202020212541.1U CN202020212541U CN211237053U CN 211237053 U CN211237053 U CN 211237053U CN 202020212541 U CN202020212541 U CN 202020212541U CN 211237053 U CN211237053 U CN 211237053U
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Abstract
The utility model discloses a power cable prevents destroying early warning system, including burying ground cable, setting up in the vibration sensor who buries the ground cable top and with the backstage monitored control system that the vibration sensor is connected, the below tip of vibration sensor inserts the earth's surface and extends the top of burying ground cable, and its pin fin is the platform and contacts with the earth's surface for collect bottom surface vibration signal, a plurality of the vibration sensor evenly arranges in near the buried cable top of construction area distance; the background monitoring system comprises a data acquisition module, a data analysis module, a signal early warning module and a separated control platform which are sequentially connected, each vibration sensor is respectively connected with the data acquisition module through a wire, the signal early warning module is arranged in a construction area and carries out field alarm according to a signal transmitted by the data analysis module, the separated control platform is a remote background and is used for displaying information of a buried cable, receiving the feedback of the signal early warning module and feeding the feedback to power personnel in real time to carry out early warning protection in real time.
Description
Technical Field
The utility model relates to a power cable prevents destroying early warning system that is used for power cable operation to maintain detection area field.
Background
Along with the rapid development of urban construction, the city is pleasing to the eye, the high power supply reliability concept is deep in mind, newly-built transmission of electricity, distribution lines have adopted the cable laying mode basically, the cable is laid underground, although the power supply reliability has had great promotion than overhead line, the road is widened, plant trees, engineering such as construction often excavates underground, especially often construct machinery and construct in the cable protection district, lead to digging of cable disconnected easily, make the outer damage fault of cable can't obtain effective suppression, thereby cause huge threat to cable channel. The main objective of technical staff lies in developing a power cable prevents destroying early warning system, aims at remedying the not enough of grasping the construction site information in the cable equipment protection process, in time discovers the source of danger on the cable channel in the construction site, sends early warning information in advance, informs the staff of equipment to go to the building site and protect the cable equipment, when saving the cost of labor greatly, effectively strengthens the protection to the cable equipment, reduces the emergence of cable external damage trouble, improves power transmission's stability.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming prior art not enough, providing a power cable prevents destroying early warning system, it can realize burying the effective monitoring of ground cable state to the job site periphery.
One technical scheme for achieving the above purpose is as follows: a power cable damage prevention early warning system comprises a buried cable, a vibration sensor and a background monitoring system, wherein the buried cable is located near a construction area;
the vibration sensors are of nail-shaped structures, the tips of the lower parts of the vibration sensors are inserted into the ground surface and extend to the upper part of the buried cable, nail heads of the vibration sensors are in a platform and are in contact with the ground surface to collect vibration signals of the bottom surface, and the vibration sensors are uniformly distributed above the buried cable near the distance of a construction area;
the background monitoring system comprises a data acquisition module, a data analysis module, a signal early warning module and a separated control platform which are sequentially connected, wherein each vibration sensor is respectively connected with the data acquisition module through a wire, the signal early warning module is arranged in a construction area and carries out on-site alarm according to a signal transmitted by the data analysis module, the separated control platform is a remote background and is used for displaying information of a buried cable, receiving the feedback of the signal early warning module and feeding the feedback to power personnel in real time to carry out early warning protection in real time.
Further, the vibration sensor comprises a metal probe, a piezoelectric element, a mass block, a pre-pressing spring and a plastic shell; the metal probe forms the tip of the lower part of the vibration sensor and is positioned below the plastic shell, and the piezoelectric element, the mass block and the pre-pressing spring are coaxially stacked from bottom to top in sequence and are arranged in the plastic shell and are connected with the metal probe through a bolt penetrating through the center.
Furthermore, the data acquisition module comprises a signal amplification module and a signal preprocessing module, the signal amplification module receives the vibration signal of the vibration sensor and amplifies the voltage, and the signal preprocessing module adopts a differential amplifier to filter noise signals acquired in the environment to realize differential amplification.
Furthermore, the signal early warning module comprises a serial port receiving module and red, yellow and green lamps, receives a feedback result of the signal processing module, and displays different lamps to be turned on according to different identified target signals to give a warning prompt.
The utility model has the advantages that:
1) compared with the traditional warning of a cable warning board on a construction site, the utility model introduces the functions of information acquisition, analysis and the like, and combines the use of a separate control platform to form the Internet of things of the cable warning board;
2) the utility model can intelligently judge the distance and the construction speed of the large construction machine through the analysis function of the vibration signal and the setting function of the initial value;
3) through the use of the utility model, the defect that the master of the equipment is not enough to master the progress of the construction site is made up, and the condition of the construction site can be monitored in real time;
4) the utility model introduces the anti-theft function through the vibration monitoring of the earth surface around the cable, thereby avoiding the malicious damage and the property loss of the company;
5) through comparison of a plurality of vibration monitoring devices, misjudgment caused by faults of one monitoring device is avoided, and the accuracy of monitoring a construction site is improved;
6) can be recycled, can be repeatedly used, is suitable for various construction site types, and saves the cost.
Drawings
Fig. 1 is a schematic structural view of a power cable damage prevention early warning system of the present invention;
fig. 2 is a schematic structural diagram of a vibration sensor of a power cable damage prevention early warning system according to the present invention;
fig. 3 is a circuit diagram of a signal amplifying circuit adopted by the data acquisition module of the anti-damage pre-warning system for power cables of the present invention;
fig. 4 is a signal processing flow chart of a power cable damage prevention early warning system of the present invention;
fig. 5 is the utility model discloses a target vibration signal identification flow chart of early warning system is prevented destroying by power cable.
Detailed Description
In order to better understand the technical solution of the present invention, the following detailed description is made by specific embodiments:
as shown in fig. 1, the power cable damage prevention early warning system includes a buried cable 1 located near a construction area, a vibration sensor 4 disposed above the buried cable, and a background monitoring system connected to the vibration sensor 4. Wherein the buried cable 1 is wrapped by a flexible protective insulator 2 to play a role in protecting the cable. Cable 1 comprises conductor sinle silk, shielding layer, insulating layer, protective layer, and every cable has solitary serial number, contains the information of cable length, geographical position, coverage, in case take place the early warning condition, can in time confirm the cable position of taking place the early warning according to the serial number. Vibration sensor 4 is nail column structure, and its below tip inserts the earth's surface and extends to buried cable 1's top, and its pin fin is the platform and contacts with earth's surface 3 for collect bottom surface vibration signal, a plurality of vibration sensor 4 evenly arranges in near the buried cable 1 top of construction area distance. The background monitoring system comprises a data acquisition module 6, a data analysis module 7, a signal early warning module 8 and a separated control platform 9 which are sequentially connected, each vibration sensor is respectively connected with the data acquisition module 6 through a wire 5, the data acquisition module 6 is connected with the data analysis module 7 and the signal early warning module 8 in a wired or wireless network mode, the signal early warning module 8 is arranged on a construction area site, and site warning is carried out according to signals transmitted by the data analysis module 7. The separated control platform 9 is a remote background, displays information of the buried cable, receives feedback of the signal early warning module, feeds the information back to power personnel in real time, and performs early warning protection in real time.
Referring to fig. 2, the specific structure of the vibration sensor 4 includes a metal probe 10, a piezoelectric element 12, a mass 14, a pre-compression spring 15, and a plastic housing 13. The metal probe 10 forms the lower tip of the vibration sensor 4, is located below the plastic shell 13, and the piezoelectric element 12, the mass block 14 and the pre-pressing spring 15 are coaxially stacked from bottom to top and arranged in the plastic shell, and are connected with the metal probe 10 through a bolt 11 penetrating through the center, so that the metal probe has high resonance frequency. When the metal probe 10 receives a vibration signal transmitted from the outside, the piezoelectric element 12 can respond well to generate a voltage and accurately feed back the magnitude of the vibration amplitude. The piezoelectric element 12 is composed of two piezoelectric sheets, and the two surface layers of the piezoelectric sheets are provided with silver layers embedded with plating, and output leads are welded on the silver layers. A mass 14 having a large specific gravity is placed above the piezoelectric element 12, and a preload spring is used to apply a load to the mass. The whole system is arranged in a plastic shell 13, and a thickened and rigid plastic shell is adopted, so that the output of false signals is avoided. When the mass 14 experiences the same vibration as the metal probe 10, the mass 14 has an alternating force proportional to the acceleration acting on the piezoelectric sheet, which generates an alternating charge, i.e., voltage, on both surfaces thereof due to the piezoelectric effect. The vibration sensor 4 is a piezoelectric acceleration sensor, the vibration frequency of people, vehicles and construction machinery is selected according to the vibration frequency, when the piezoelectric element 12 deforms under the action of external force, electric charges are generated on a crystal surface or a polarization surface of the piezoelectric element, and voltage required to be collected is generated through conversion from mechanical energy to electric energy. The natural frequency of the vibration sensor 4 is 200HZ, the distortion factor is less than 0.2%, the open-circuit damping is 0.45, the open-circuit sensitivity is 23v/m/s, the coil resistance is 570 omega, the suspension mass is 5g, the maximum peak shift-peak value of the coil is 1.5mm, and the use temperature range is-40 to +70 ℃.
The voltage signal generated by the vibration sensor 4 is transmitted to a data acquisition module 6 through a lead 5, and the data acquisition module 6 comprises a signal amplification module and a signal preprocessing module. The signal amplification module adopts a differential amplifier, signals are input through two paths to realize differential amplification, common mode interference to the ground in the input signals can be removed, and stable amplification gain is achieved according to self compensation capability. As shown in fig. 3, a schematic diagram of a signal amplification circuit is shown, a three-operational amplifier improved design is adopted, and accurate programming of gain is realized by adjusting an absolute value of an on-chip resistor. The input transistors Q1 and Q2 provide a high precision differential pair bipolar input, while Super6eta processing is used, which reduces the input bias current by a factor of 10. Feedback loops Q1-a1-R1 and Q2-a2-R2 maintain constant collector currents of the input devices Q1 and Q2 so that the input voltage can be applied to the external gain setting resistor Re. This produces a differential gain output from the input to Al/a2, which is calculated as G ═ (R1+ R2)/Re + 1. The unity gain subtractor a3 is used to cancel any common mode signal to obtain a level that is scaled to the REF pin. The voltage signal is amplified to the voltage level through the amplification of the signal amplification circuit, and the amplified voltage signal passes through the signal preprocessing circuit in the data acquisition module 6 to filter noise waves which generate interference in the environment, so that continuous accurate voltage change data can be obtained in real time. As shown in fig. 4, the signal processing flow includes: signal amplification → band-pass filtering → wavelet noise reduction, filtering the acquired signal by an FIR band-pass filter, and downsampling the signal. And then carrying out wavelet decomposition on the acquired signal, determining a closed value of a wavelet coefficient, retaining the original coefficient value when the coefficient of the signal after the wavelet decomposition is greater than the threshold value, and setting the coefficient to be zero if not. And then performing wavelet inverse transformation, and reconstructing the wavelet coefficient subjected to threshold processing to obtain a restored original signal, namely the signal subjected to signal processing.
The voltage change data is transmitted to a data analysis module 7, the data analysis module 7 is an embedded signal processing module and comprises an STM32F407 single chip microcomputer module and a serial port transmission module, the signal processing module measures the frequency of pulses by inputting a capture mode through a timer, after the signals are transmitted to the single chip microcomputer, the single chip microcomputer receives the data transmitted by the serial port, the edge signals on a channel of the timer are detected, when the edge signals jump, the value of the current timer is put into a capture register of a corresponding channel to complete one-time capture, the frequency of a pulse waveform is calculated by capturing the interval time of two input pulses, the threshold range of the voltage is set, the times that the voltage change data exceeds the threshold in a unit period are counted, different targets generated by vibration are judged by the times exceeding the threshold, and the characteristics of the targets are judged according to the different frequencies generated in different target unit periods, and sending out a target characteristic signal, and displaying on an upper computer. As shown in fig. 5, in the process of target identification, the threshold range and the peak frequency are determined, the preprocessed data are transmitted to the single chip, and are compared with the threshold range set in the single chip, if the preprocessed data exceed the set threshold range, the number of zero-crossing numbers in the fixed window is counted; if the value is smaller than the set threshold range, the result A is output, and no vibration influence exists. Calculating the peak frequency in a fixed window, and if the frequency range is a, outputting a result B, namely the result B is influenced by the target 1; if the frequency range is b, the result C is output, i.e. affected by the target 2.
The signal early warning module 8 comprises a serial port receiving module and red, yellow and green lamps, the signal early warning module 8 receives a feedback result of the data analysis module 7, and the on and the flicker of the lamps are selected according to judgment results of different targets, so that the purpose of on-site early warning is achieved.
The remote background separation type control platform 9 can display the specific condition of each position cable and the area frequently generating early warning in real time, can inquire historical data generated, further judges the important monitoring field, and displays the target causing the cable early warning and the geographic position of the cable in real time once receiving the real-time early warning of the signal early warning module 8 to inform a worker to go to process.
The modules of the power cable damage-prevention early warning system are connected through a wire or a wireless network, receive and transmit the numerical value of voltage, establish a coordinate system with the collection point as an original point according to the variation of the vibration signal of the collection point, and judge the distance of the construction machinery.
The power cable damage prevention early warning system is characterized in that a single chip microcomputer is used for acquiring data and controlling the early warning system, a separate control platform is used for storing various complex data and controlling the single chip microcomputer, RXD (data transmission) and TXD (data reception) leads on the single chip microcomputer are used for communicating with the outside, the full-duplex serial communication port UART on the single chip microcomputer is used for receiving completely and independently, a sending buffer SBUF is used for sending and receiving data simultaneously, a zero MODEM mode is adopted when the communication distance is short, a simple three-wire structure is adopted, and a level conversion chip is adopted for ensuring serial communication between the single chip microcomputer and the separate control platform.
The separated control platform is added with a data storage module, the occurring early warning conditions are subjected to statistical analysis, and the time and the geographic position of the frequent occurrence of the early warning conditions are predicted by a mathematical model. The power cable damage prevention early warning system is packaged by an outer sleeve with a warning mark, and stable operation of an internal circuit is protected.
The utility model discloses can realize the early warning protection in advance to power cable, vibration sensor receives and surpasss the threshold signal of setting for, through the type and the distance of crest detection discernment target, can reach signal early warning module with data transmission, realizes power cable's early warning, has protected power cable's safety and stability operation, has stronger practicality, reduces power cable daily maintenance work, reaches the purpose of real-time early warning.
It will be appreciated by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as limitations of the present invention, and that changes and modifications to the above described embodiments will fall within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (4)
1. The utility model provides a power cable prevents destroying early warning system, including be located near the construction area buried cable, set up in the vibration sensor who buries the ground cable top and with the backstage monitored control system that vibration sensor connects, its characterized in that:
the vibration sensors are of nail-shaped structures, the tips of the lower parts of the vibration sensors are inserted into the ground surface and extend to the upper part of the buried cable, nail heads of the vibration sensors are in a platform and are in contact with the ground surface to collect vibration signals of the bottom surface, and the vibration sensors are uniformly distributed above the buried cable near the distance of a construction area;
the background monitoring system comprises a data acquisition module, a data analysis module, a signal early warning module and a separated control platform which are sequentially connected, wherein each vibration sensor is respectively connected with the data acquisition module through a wire, the signal early warning module is arranged in a construction area and carries out on-site alarm according to a signal transmitted by the data analysis module, the separated control platform is a remote background and is used for displaying information of a buried cable, receiving the feedback of the signal early warning module and feeding the feedback to power personnel in real time to carry out early warning protection in real time.
2. A power cable tamper-evident early warning system as recited in claim 1, wherein: the vibration sensor comprises a metal probe, a piezoelectric element, a mass block, a pre-pressing spring and a plastic shell; the metal probe forms the tip of the lower part of the vibration sensor and is positioned below the plastic shell, and the piezoelectric element, the mass block and the pre-pressing spring are coaxially stacked from bottom to top in sequence and are arranged in the plastic shell and are connected with the metal probe through a bolt penetrating through the center.
3. A power cable tamper-evident early warning system as recited in claim 1, wherein: the data acquisition module comprises a signal amplification module and a signal preprocessing module, the signal amplification module receives vibration signals of the vibration sensor and amplifies the voltage, and the signal preprocessing module adopts a differential amplifier to filter noise signals acquired in the environment to realize differential amplification.
4. A power cable tamper-evident early warning system as recited in claim 1, wherein: the signal early warning module comprises a serial port receiving module and red, yellow and green lamps, receives a feedback result of the data analysis module, and displays different lamps to be turned on according to different identified target signals to give a warning prompt.
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| CN202020212541.1U CN211237053U (en) | 2020-02-26 | 2020-02-26 | Power cable prevents destroying early warning system |
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| CN202020212541.1U CN211237053U (en) | 2020-02-26 | 2020-02-26 | Power cable prevents destroying early warning system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112489384A (en) * | 2020-11-16 | 2021-03-12 | 国网上海市电力公司 | Cable damage prevention early warning method based on awakening detection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112489384A (en) * | 2020-11-16 | 2021-03-12 | 国网上海市电力公司 | Cable damage prevention early warning method based on awakening detection |
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