A cable remote end distinguishing device based on sound waves

Abstract

The present invention discloses a remote cable identification device based on sound waves, which includes a transmitting end and a receiving end. The device transmits a sound wave signal to the outer layer of the protective sheath of the head-end cable line, and monitors and analyzes the sound wave signal at the outer layer of the protective sheath of the remote cable line to obtain the cable line identification result. The device is suitable for remote identification of live cables after being buried underground or passing through a wall. It is directly connected to the cable surface, has no electrical connection with the live core of the cable, and does not touch the live conductor inside the cable. Therefore, operating the device will not cause electric shock accidents to people and equipment safety accidents, does not require power off and grounding, does not affect the normal operation of the cable, does not need to damage the cable, and can perform differentiation tests on both live and dead cables, with reliable safety and accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and in particular to a cable far-end distinguishing device based on sound waves. Background Art

[0002] During cable laying and maintenance, multiple low-voltage live cables often share the same path. Remotely distinguishing each cable is time-consuming and laborious, sometimes even requiring power outage testing. The resulting efficiency, power outages, and safety issues continue to plague power grid maintenance departments. Due to the large number of cables and the heavy workload associated with alignment, even the slightest oversight can lead to errors, which can impact efficiency and delay construction, or even disrupt equipment operation and cause grid safety incidents.

[0003] The principle of traditional alignment instruments is based on the on / off function of a multimeter, assisted by some other simple communication equipment. This method wastes manpower and material resources, is inefficient, and has great safety risks. One type of method is based on the common end of the reference core, using a pulse signal or potential signal as the transmission medium. It is necessary to determine the reference core based on the traditional multimeter method, and the transmission medium poses a safety risk in cable cores with protective voltage and current. It is very likely to cause discrimination interference to the relay protection device in the station and cause protection malfunction. In actual use, there are certain limitations. Existing alignment instrument devices are mostly focused on distinguishing and detecting the internal cores of multi-core cables. They need to be powered off or grounded, and cannot be used for alignment testing when the cable is in normal operation. Summary of the Invention

[0004] To this end, the present invention provides a cable remote distinguishing device based on sound waves to solve the problem that existing alignment instruments are mostly used to distinguish and detect cable cores, and distinguishing each cable at the remote end is time-consuming and labor-intensive.

[0005] In order to achieve the above object, the present invention provides the following technical solutions: a device for distinguishing the far ends of cables based on sound waves, the device comprising a transmitting end and a receiving end;

[0006] The transmitting end includes a transmitting end main control module and an acoustic signal transmitting module connected to the transmitting end main control module, and the acoustic signal transmitting module is used to send an acoustic signal to the outer layer of the protective skin of the head-end cable;

[0007] The receiving end includes a receiving end main control module and an acoustic wave signal detection module connected to the receiving end main control module. The acoustic wave signal detection module is used to detect and obtain the acoustic wave signal in the outer layer of the protective sheath of the remote cable line. The receiving end main control module is used to analyze the received acoustic wave signal and obtain the cable pair identification result.

[0008] Furthermore, the transmitting end and the receiving end perform coordinated transmission and reception control through a wireless communication module.

[0009] Furthermore, the receiving end main control module is specifically used to compare the actual measurement results obtained by detection with the simulation results obtained by simulation modeling and perform probability calculation to obtain the alignment probability of different cables.

[0010] Furthermore, the receiving end main control module is also connected to a receiving end matrix analysis module, which is used to call the relevant operation model from the pre-built simulation model library to calculate and obtain the simulation results based on the input parameters of the tested cable and the ambient temperature and humidity parameter data, so as to compare with the measurement results and calculate the probability of cable alignment. The parameters related to the tested cable include the measured length range, the number of cables and the cable specification data.

[0011] Furthermore, the construction content of the simulation model library includes modeling the materials and structures of single-core and multi-core cables according to the sound wave attenuation laws of different types of cables, using the finite element analysis method to analyze the propagation phase and amplitude change laws in each layer of the cable after the sound is emitted from the surface of the live cable, analyzing the sound wave attenuation at different positions at the far end of the cable, and solving the propagation equations at different frequencies, different temperatures and different inspection point positions; as well as modeling and analyzing the signal crosstalk between multiple cables to establish a multivariate equation to solve the cable coupling matrix.

[0012] Furthermore, the acoustic signal transmitting module and the acoustic signal detecting module are both connected to an isolation module, which is used to conduct the acoustic signal and prevent the presence of a higher voltage in the cable to be tested from affecting the signal generating circuit or the detection circuit.

[0013] Furthermore, both the transmitting end and the receiving end are provided with a calculation module connected to the main control module, which is used to perform arithmetic operations and logical operations; both the transmitting end and the receiving end are provided with a button and display module connected to the main control module, which is used to perform line-related button operations and display detection information, including time and power device information.

[0014] Furthermore, both the transmitting end and the receiving end are provided with a noise reduction module connected to the main control module for removing noise signal interference.

[0015] Furthermore, both the transmitting end and the receiving end are provided with a storage module connected to the main control module for storing data.

[0016] Furthermore, both the transmitting end and the receiving end are provided with a power supply module connected to the main control module, which is used to supply power to each module of the transmitting end or the receiving end.

[0017] The present invention has the following advantages:

[0018] The present invention proposes a remote cable identification device based on acoustic waves, which includes a transmitting end and a receiving end. The device transmits an acoustic wave signal to the outer layer of the protective sheath of the head-end cable line, and monitors and analyzes the acoustic wave signal at the outer layer of the protective sheath of the remote cable line to obtain the cable line identification result. The device is suitable for remote identification of live cables after they are buried underground or penetrate a wall. It is directly connected to the cable sheath, has no electrical connection to the live core of the cable, and does not touch the live conductor inside the cable. Therefore, operating the device will not cause electric shock accidents to people or equipment safety accidents, does not require power off and grounding, does not affect the normal operation of the cable, and does not damage the cable. It can perform differentiation tests on both live and dead cables, and has reliable safety and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0020] Figure 1 A schematic diagram of the structure of a transmitter of a device for distinguishing the remote ends of cables based on acoustic waves provided in Example 1 of the present invention;

[0021] Figure 2 A schematic diagram of the receiving end structure of a cable remote end distinguishing device based on sound waves provided in Example 1 of the present invention;

[0022] Figure 3 A schematic diagram of wireless communication between a transmitting end and a receiving end in a device for distinguishing remote ends of a cable based on sound waves provided in Example 1 of the present invention;

[0023] Figure 4 A schematic diagram of a process for obtaining cable pair identification results of a cable remote end differentiation device based on acoustic waves provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0024] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0025] Example 1

[0026] This embodiment proposes a remote cable identification device based on acoustic waves, which includes a transmitter and a receiver. The device forms a cable correspondence relationship by transmitting and receiving acoustic wave signals and performing corresponding processing and analysis, thereby completing the remote identification of low-voltage live cables.

[0027] Acoustic signals have the advantages of being less susceptible to interference from field electromagnetic noise, being easy to concentrate energy, and being able to propagate over longer distances. Acoustic signals can be effectively propagated in cables.

[0028] In this embodiment, Figure 1 As shown, the transmitting end includes a transmitting end main control module and an acoustic signal transmitting module connected to the transmitting end main control module, and the acoustic signal transmitting module is used to send an acoustic signal to the outer layer of the protective skin of the head-end cable;

[0029] like Figure 2 As shown, the receiving end includes a receiving end main control module and an acoustic wave signal detection module connected to the receiving end main control module. The acoustic wave signal detection module is used to detect and obtain acoustic wave signals in the outer layer of the protective sheath of the remote cable line. The receiving end main control module is used to analyze the received acoustic wave signals and obtain cable pair identification results.

[0030] In this embodiment, Figure 3 As shown in the figure, the transmitter and receiver are controlled by the wireless communication module. The wireless communication module is mainly responsible for the wireless communication between the main control end and the terminal.

[0031] The receiving end's main control module compares the actual measurement results with the simulation results from the modeling and calculates the probability of alignment for different cables. It can remotely detect acoustic signals from multiple cables and calculate the probability, with the highest probability being the most likely alignment result.

[0032] The receiving end main control module is also connected to the receiving end matrix analysis module, which is used to call the relevant operation model from the pre-built simulation model library to calculate and obtain the simulation results based on the input parameters of the tested cable and the ambient temperature and humidity parameter data, so as to compare with the measurement results and calculate the probability of cable alignment. The parameters of the tested cable include the measured length range, the number of cables and the cable specification data. The process of obtaining the simulation results and alignment results is as follows: Figure 4 As shown in the figure, the system measurement probability is obtained by analyzing and comparing the modeling simulation results with the experimental measurement results and performing correction processing.

[0033] The simulation modeling research content in this embodiment mainly includes:

[0034] 1. Modeling the propagation characteristics of sound in different types of live cables

[0035] The sound wave attenuation law of different types of cables is obtained by modeling the materials and structures of single-core and multi-core cables, using the finite element analysis method to analyze the propagation phase and amplitude change law in each layer of the cable after the sound and electromagnetic waves are emitted from the surface of the live cable, analyzing the attenuation at different positions at the far end of the cable, and solving the propagation equations at different frequencies, different temperatures and different inspection point positions.

[0036] 2. Crosstalk between multiple cables and modeling analysis

[0037] When multiple live cables are close to or cross each other, coupling modulation will occur in the signals. In addition, the signals processed by the identification and detection are mostly weak signals, and the influence of noise will make the identification more difficult. The simulation modeling content includes modeling and analyzing the signal crosstalk between multiple cables, establishing a multivariate equation to solve the cable coupling matrix, and using a high-speed processor to find the optimal solution to improve the identification accuracy.

[0038] A simulation model library is constructed based on the propagation equations and matrix models obtained from the above simulation modeling research. According to the actual detection object parameters and environmental parameters, the corresponding calculation models in the model library are called to obtain simulation results, and the cable pair identification results are obtained by comparative analysis with the measurement results.

[0039] Both the acoustic signal transmitting module and the acoustic signal detecting module are connected to an isolation module, which is mainly composed of insulating ceramic materials. The isolation module is used to transmit the acoustic signal and prevent the presence of high voltage in the cable to be tested from affecting the signal generating circuit or the detection circuit.

[0040] Both the transmitter and receiver are equipped with a calculation module connected to the main control module for performing arithmetic and logical operations. The calculation module is the core of the operator; relative to the main control module, the operator receives commands from the main control module and performs actions. Both the transmitter and receiver are equipped with a key and display module connected to the main control module for performing line-related key operations and displaying detection information, including time and device power information. Both the transmitter and receiver are equipped with a noise reduction module connected to the main control module for removing noise signal interference. Both the transmitter and receiver are equipped with a storage module connected to the main control module for data storage. The storage module includes the CPU's on-chip cache and register group, which temporarily stores data in the CPU, used to store data awaiting processing or already processed data. Both the transmitter and receiver are equipped with a power supply module connected to the main control module for powering the various modules on the transmitter and receiver sides. This module includes a variable power supply circuit that converts the system power supply voltage to the power supply voltage required by the device.

[0041] The main control module is the brain of the entire device, responsible for checking the coordination of all modules and serving as the program processing center. It handles key operations in the key and display module, as well as the functions of the display and touchscreen operations. The main control module also includes a high-precision clock, providing the system with highly accurate real-time time. The key and display module allows operators to view the display content and select and change settings, such as setting the device time, by selecting key combinations. The display displays information such as the time and battery level, enabling real-time information processing and display. The receiving-end key and display module primarily allows operators to view test results.

[0042] This device has the following advantages:

[0043] 1) Using acoustic signals, which are less susceptible to electromagnetic noise, have the advantages of being easily concentrated, and can travel over long distances. Furthermore, acoustic signal transceiver equipment is relatively inexpensive, facilitating large-scale adoption.

[0044] 2) Using this device to align buried cables can not only improve the safety level of on-site work and the safety and stability of the power grid, but also improve production efficiency and save a lot of manpower and material costs. It is an urgent need for on-site safety production work.

[0045] 3) The working power module of this device is powered by a lithium battery, which is small in size, easy to carry, has strong endurance and good continuity. It is also equipped with a switch and a power indicator light. The switch can disconnect the power when not in use. The indicator light shows that the battery power is divided into 4 levels, namely 100%, 75%, 50% and 25%, and the corresponding indicator light colors are green, blue, yellow and red. When the battery power is lower than 15%, the red light flashes to remind the staff to charge in time.

[0046] Technical indicators:

[0047] 1) The test distinguishes the cable diameter range from 10mm to 30mm;

[0048] 2) Test and distinguish the voltage range of live cables 0-10KV;

[0049] 3) The test distinguishes the cable communication distance is greater than or equal to 20 meters;

[0050] 4) The test accuracy is greater than or equal to 98%;

[0051] Economic indicators:

[0052] 1) The debugging and distinguishing device can quickly distinguish the remote cables, reduce the construction difficulty, construction period and workload, and thus reduce the construction cost;

[0053] 2) The device can test and differentiate live cables without power outages, reducing the necessary power outage time and frequency. On the one hand, it does not affect the collection of electricity charges, and on the other hand, it can reduce the economic losses of users caused by power outages; the social benefits are obvious.

[0054] Quality indicators:

[0055] 1) The product is designed to have a continuous working reliability of 1000 hours;

[0056] 2) The operating temperature range of the product is -30℃ to 50℃;

[0057] This device can distinguish between live and dead cables. It contacts the cable sheath and does not touch the internal live conductors. Therefore, operating the device will not cause any personal or equipment safety accidents. The device's risk assessment level is low.

[0058] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made thereto. Therefore, such modifications and improvements, without departing from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. A cable remote end distinguishing device based on sound waves, characterized in that: The device includes a transmitting end and a receiving end; The transmitting end includes a transmitting end main control module and an acoustic signal transmitting module connected to the transmitting end main control module, and the acoustic signal transmitting module is used to send an acoustic signal to the outer layer of the protective sheath of the head-end cable; The receiving end includes a receiving end main control module and an acoustic wave signal detection module connected to the receiving end main control module. The acoustic wave signal detection module is used to detect and obtain the acoustic wave signal in the outer layer of the protective sheath of the remote cable line. The receiving end main control module is used to analyze the received acoustic wave signal to obtain the cable alignment identification result; the receiving end main control module is specifically used to compare the actual measurement results obtained by detection with the simulation results obtained by simulation modeling and perform probability calculation to obtain the alignment probability of different cables.

2. The device for distinguishing the far ends of cables based on sound waves according to claim 1, characterized in that: The transmitting end and the receiving end perform coordinated transmission and reception control through the wireless communication module.

3. The device for distinguishing the far ends of cables based on sound waves according to claim 1, characterized in that: The receiving end main control module is also connected to a receiving end matrix analysis module, which is used to call the relevant operation model from the pre-built simulation model library to calculate and obtain the simulation results based on the input parameters of the tested cable and the ambient temperature and humidity parameter data, so as to compare with the measurement results and calculate the probability of cable alignment. The parameters related to the tested cable include the length range of the tested cable, the number of cables and the cable specification data.

4. The device for distinguishing the far ends of cables based on sound waves according to claim 3, characterized in that: The construction of the simulation model library includes modeling the materials and structures of single-core and multi-core cables according to the sound wave attenuation laws of different types of cables, using finite element analysis methods to analyze the propagation phase and amplitude change laws in each layer of the cable after the sound is emitted from the surface of the live cable, analyzing the sound wave attenuation at different positions at the far end of the cable, and solving the propagation equations at different frequencies, different temperatures and different inspection point positions; as well as modeling and analyzing the signal crosstalk between multiple cables and establishing a multivariate equation to solve the cable coupling matrix.

5. The device for distinguishing the far ends of cables based on sound waves according to claim 1, characterized in that: The acoustic signal transmitting module and the acoustic signal detecting module are both connected to an isolation module, which is used to conduct the acoustic signal and prevent the presence of a higher voltage in the cable to be tested from affecting the signal generating circuit or the detecting circuit.

6. The device for distinguishing the far ends of cables based on sound waves according to claim 1, characterized in that: Both the transmitting end and the receiving end are provided with a calculation module connected to the main control module, which is used to perform arithmetic operations and logical operations; both the transmitting end and the receiving end are provided with a button and display module connected to the main control module, which is used to perform line-related button operations and display detection information, including time and power device information.

7. The device for distinguishing the far ends of cables based on sound waves according to claim 1, characterized in that: The transmitting end and the receiving end are both provided with a noise reduction module connected to the main control module for removing noise signal interference.

8. The device for distinguishing the far ends of cables based on sound waves according to claim 1, characterized in that: The transmitting end and the receiving end are both provided with a storage module connected to the main control module for storing data.

9. The device for distinguishing the far ends of cables based on sound waves according to claim 1, characterized in that: The transmitting end and the receiving end are both provided with a power supply module connected to the main control module, which is used to supply power to each module of the transmitting end or the receiving end.

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