CN110514966A - A kind of cable monitoring system - Google Patents
A kind of cable monitoring system Download PDFInfo
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- CN110514966A CN110514966A CN201910904080.6A CN201910904080A CN110514966A CN 110514966 A CN110514966 A CN 110514966A CN 201910904080 A CN201910904080 A CN 201910904080A CN 110514966 A CN110514966 A CN 110514966A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 74
- 230000011664 signaling Effects 0.000 claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 29
- 230000008878 coupling Effects 0.000 claims description 16
- 238000010168 coupling process Methods 0.000 claims description 16
- 238000005859 coupling reaction Methods 0.000 claims description 16
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 abstract description 7
- 230000007257 malfunction Effects 0.000 abstract description 5
- 230000008030 elimination Effects 0.000 abstract description 3
- 238000003379 elimination reaction Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000004891 communication Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000005611 electricity Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 238000013024 troubleshooting Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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- 238000000638 solvent extraction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to Cable Fault Detection Technology fields, a kind of cable monitoring system is specifically disclosed, the detection device of several voltage sensors on each monitoring point of cable and the one-to-one connection of the voltage sensor and signaling device, the decoding apparatus of the one-to-one connection of the detection device are separately positioned on；The voltage sensor is used to acquire the voltage signal on the monitoring point；The detection device in the exception of the voltage signal for driving the signaling device to generate coding and being sent to the decoding apparatus, wherein described to encode the position for being used to indicate the monitoring point；The decoding apparatus receives the coding and decodes, to obtain and export the location information of the monitoring point.Several monitoring points are reasonably arranged in the present invention on cable run, by detecting the voltage on the test point, that is, reduce cable fault excluded ranges, improve malfunction elimination efficiency.
Description
Technical field
The present invention relates to Cable Fault Detection Technology field, in particular to a kind of cable monitoring system.
Background technique
In life, from power supply box to the cable run of load equipment power input, generally require by uninterrupted power supply
System, power supply panel distribution system, more conversion terminal are just connected to the power module input of load equipment after one section of one section of connection
End.When power supply output is normal, when load equipment disconnection fault, reason may be from power output end cable connection to load equipment
Power module input terminal cable run in have any one position disconnect or poor contact.Professional technician need analyze,
Judge failure cause, compression fault coverage searches fault point, when cable run is long, conversion terminal is more, wiring is difficult, mark is unclear
Whens clear equal, artificial debugging is only leaned on, low efficiency, difficulty is big.
To solve the above problems, now mostly using induced current monitoring method, multiple monitoring points are arranged in this method on cable,
Whether by judging the electric current at each monitoring point normally, with the position occurred of debugging.This kind of monitoring mode can only judge
There is power-off or broken string in a certain whole cable run or some circuit, more for transit point, and the longer cable of route is also only
It is a big direction；It is illustrated in fig. 1 shown below, when monitoring cable has any place to disconnect, no current passes through in whole cable, therefore
It is monitored less than electric current in tri- current monitoring points of A, B, C, can only judge a cable power-off or open circuit.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of cable monitoring system, which can reduce cable
Occur powering off in road or the position of poor contact locating for range, improve fault removal efficiency.
In order to achieve the above object, the invention adopts the following technical scheme:
A kind of cable monitoring system, comprising:
Several voltage sensors being separately positioned on each monitoring point of cable, with the one-to-one company of the voltage sensor
The detection device connect, the signaling device with the one-to-one connection of the detection device, decoding apparatus；
The voltage sensor is used to acquire the voltage signal on the monitoring point；
The detection device is encoded and is sent for driving the signaling device to generate in the exception of the voltage signal
To the decoding apparatus, wherein described to encode the position for being used to indicate the monitoring point；
The decoding apparatus receives the coding and decodes, to obtain and export the location information of the monitoring point.
Compared with prior art, several monitoring points are reasonably arranged in the present invention on cable run, using in cable
The characteristic for the induced voltage that voltage can generate when flowing through cable on cable insulation surface layer, by the way that voltage is arranged on each test point
Sensor is receiving its corresponding voltage sensor to incude voltage thereon, with the detection device of the one-to-one connection of voltage sensor
The voltage signal of device output, when the voltage of voltage sensor output is zero, detection device starting signaling device is generated and sent
The coding of location information with the monitoring point, decoding apparatus receive the encoded signal and decode, to obtain failure
The location information of monitoring point and output.The location information and voltage of the monitoring point of the failure of staff decoding apparatus output
On-off characteristic, will can occur powering off in cable run or the position of poor contact be locked in the monitoring point of failure with it is neighbouring
It between the normal monitoring point of the malfunction monitoring point, and then reaches and reduces troubleshooting range, improve malfunction elimination efficiency.
Preferably, the detection device includes: amplifying circuit, it connect, is used for the output end of the voltage sensor
Amplify the voltage signal.
Preferably, the detection device further include: light emitting diode is connect with the output end of the amplifying circuit, is used
It is luminous to carry out in the voltage signal according to the amplification received；
Preferably, the detection device further include: photoelectric coupling circuit is arranged in the light emitting diode and the hair
Between code device, for the optical signal of the light emitting diode to be converted into electric signal.
Preferably, the detection device further include: the output end of relay, coil and the photoelectric coupling circuit connects
It connects；Normally-closed contact is arranged on the signaling device, for connecting the power supply of the signaling device when power loss.
Preferably, the amplifying circuit includes the first triode, the second triode；The base stage of first triode is logical
It crosses first resistor to connect with the voltage sensor, collector connects power supply, and emitter is connect with the base stage of second triode；
The collector of second triode is sequentially connected with the light emitting diode and power supply, emitter ground connection.
Preferably, first triode and the second triode are 9014C type triode.
Preferably, the photoelectric coupling circuit includes third transistor, operational amplifier, photo resistance；
The base stage of the third transistor passes sequentially through second resistance, photo resistance ground connection and passes through first capacitor
Ground connection；The collector of the third transistor is sequentially connected with the 4th resistance and power supply；
The emitter of the third transistor passes through the 6th resistance eutral grounding；
The base stage of the third transistor passes sequentially through 3rd resistor, the second capacitor, the 4th capacitor or the 5th resistance and institute
State the input terminal connection of operational amplifier；
The base stage of the third transistor passes sequentially through the input terminal of 3rd resistor, the second capacitor and the operational amplifier
Connection；
The both ends of the coil are connect respectively with two output ends of the operational amplifier to form closed circuit.
Preferably, further include: warning device is connect with the decoding apparatus, for receiving institute in the decoding apparatus
Alarm signal is issued when stating coding.
Preferably, further including several clips being clipped on each monitoring point respectively, the voltage sensor is a pair of
One is arranged on the clip.
Detailed description of the invention
Now in conjunction with attached drawing, the invention will be further described with specific embodiment:
Fig. 1 is the existing exemplary diagram using induced current monitoring mode；
Fig. 2 is the present invention using the exemplary diagram for using voltage monitoring mode；
Fig. 3 is structure of the invention block diagram；
Fig. 4 is photoelectric coupling circuit figure of the invention；
Fig. 5 is signaling circuit diagram of the invention；
Fig. 6 is the structural schematic diagram of clip of the invention；
Fig. 7 is pictorial diagram of the invention；
In figure:
1, voltage sensor, 2, amplifying circuit, 3, photoelectric coupling circuit, 4, signaling device, 5, decoding apparatus, 6, clip,
7, emitting head, 8, communication extension set, 9, communication host, 10, cabinet, 11, cable.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
As shown in Fig. 1~7, the present invention provides a kind of cable monitoring system, comprising:
Several voltage sensors 1 being separately positioned on each monitoring point of cable, it is one-to-one with the voltage sensor 1
The detection device of connection, the signaling device 4 with the one-to-one connection of the detection device, decoding apparatus 5；
The voltage sensor 1 is used to acquire the voltage signal on the monitoring point；
The detection device is encoded and is sent for driving the signaling device 4 to generate in the exception of the voltage signal
To the decoding apparatus 5, wherein described to encode the position for being used to indicate the monitoring point；
The decoding apparatus 5 receives the coding and decodes, to obtain and export the location information of the monitoring point.
Compared with prior art, several monitoring points are reasonably arranged in the present invention on cable run, using in cable
The characteristic for the induced voltage that voltage can generate when flowing through cable on cable insulation surface layer, by the way that voltage is arranged on each test point
For sensor 1 to incude voltage thereon, detection device receives the voltage that voltage sensor 1 exports, and exports when voltage sensor 1
Voltage jump, reduction or be 0 when, detection device starting signaling device 4 generate and send the location information with the monitoring point
Coding, decoding apparatus 5 receive the encoded signal and decode, to obtain location information and the output of the monitoring point broken down.
The location information of the monitoring point for the failure that staff's decoding apparatus 5 exports and the on-off characteristic of voltage, can be by cable
Occur powering off in road or the position of poor contact is locked in the normal of the monitoring point of failure and the neighbouring malfunction monitoring point
It between monitoring point, and then reaches and reduces troubleshooting range, improve malfunction elimination efficiency.Such as shown in Fig. 2, power supply is set with load
Cable between standby with the presence of it is breaking at one when, which cannot be formed into a loop, because electric current may be not present, according to existing sense
Current monitoring method is answered, can only judge that certain this cable run has power-off or disconnection fault, but according to voltage characteristic, power supply electricity
Pressure can still collect on front side of breakpoint by cable, i.e., there is open circuit between hypothesis B, C two o'clock, then remain to monitor cable at B point
In voltage, then monitoring is less than voltage at C point, and the present invention exports the location information of failure C point, and B point is normal monitoring point, then
Can judging the cable between B, C two o'clock by logical comparison, there are open circuit faults, reduce troubleshooting range.
As shown in Figure 3,4, in the present embodiment, the detection device includes amplifying circuit 2, light emitting diode D1, photoelectricity
Coupling circuit 3, relay KY1；
The amplifying circuit 2 is connect with the output end of the voltage sensor 1, for amplifying the voltage sensor induction
The voltage signal arrived, the light emitting diode D1 are connect with the output end of the amplifying circuit 2, are received for basis
The voltage signal of amplification is luminous to carry out；The photoelectric coupling circuit 3 is arranged in the light emitting diode D1 and the hair
Between code device 4, for the optical signal of the light emitting diode D1 to be converted into electric signal；The line of induction of the relay KY1
Circle is connect with the output end of the photoelectrical coupler, and normally-closed contact is arranged on the signaling device 4, is used for the relay
The power supply of the signaling device 4 is connected when KY1 power loss.
Specifically, for example shown in Fig. 2, when the voltage of A, B, C point is normal, the sense of corresponding cable insulation surface layer generation
Voltage is answered, the corresponding voltage sensor of A, B, C point senses the induced voltage and is transmitted to amplifying circuit 2, cable insulation table
The induced voltage that layer generates drives light emitting diode D1 to shine after amplifying circuit 2 starts, and photoelectric coupling circuit 3 will shine at this time
Diode D1 luminous optical signal is converted into electric signal and output to the relay KY1, the induction on the relay KY1
Coil obtains the electric normally-closed contact for making the relay KY1 and opens, and the signaling device 4 is disconnected with power supply, cannot generate coding, nothing
Encoded signal output, each test point of A, B, C are normal；When in A, B, C point there are induced voltage mutation, reduce or be 0 when, correspond to
Detection device on light emitting diode D1 lamp go out, photoelectric coupling circuit 3 is exported without electric signal, and relay KY1 power loss makes it
Normally-closed contact closure, the power supply conducting of signaling device 4, signaling device 4, which generates, to be encoded and is sent to decoding apparatus 5, decoding apparatus 5
It receives and encodes and decode the corresponding location information in an acquisition fault point.
Judge that different location has open circuit, phase in cable it can be seen that can be segmented using voltage monitoring mode
It can only judge that some circuit has power-off or open circuit and has very big market competing compared with current monitoring mode currently on the market
Power is striven, can quickly distinguish in load equipment disconnection fault using voltage monitoring mode is equipment failure itself or certain section of cable
Line fault and the failures such as cable run power-off and poor contact, greatly improve from power supply and are output to load equipment power input
The intelligence of the cable line fault monitoring at end, practicability, accuracy, timeliness, diversity.
It in the present embodiment, further include warning device, the warning device is connect with the decoding apparatus 5, in institute
It states when decoding apparatus 5 receives the coding and issues alarm signal.Specifically, the warning device includes being connected on the decoding dress
The light emitting diode D2 and buzzer H for setting 5 output end, when open circuit or power-off occur for cable run, voltage sensor 1 is examined
When not detecting the induced voltage of cable run generation, relay KY1 power loss normally-closed contact closure, decoding apparatus 5 receives carrying
After the coding of the location information of faulty test point is decoded, driving light emitting diode D2 issues visual alarm and buzzer
H issues audio alert signal, and alarm signal of the invention also may be output to other monitoring systems or turn paging system.
As shown in figure 3, in the present embodiment, the amplifying circuit 2 includes the first triode Q1, the second triode Q2；
The base stage of the first triode Q1 is connect by first resistor R1 with the voltage sensor 1, and collector connects electricity
Source, emitter are connect with the base stage of the second triode Q2；
The collector of the second triode Q2 is sequentially connected with the light emitting diode D1 and power supply, emitter ground connection.
In the present embodiment, the first triode Q1 and the second triode Q2 is 9014C type triode.
Tested cable run is normal, and when powering normal, the induced voltage that cable surface generates is relatively faint, and the present invention is logical
Setting amplifying circuit 2 is crossed, and the amplifying circuit 2 is made of two 9014C triodes, due to optimizing base biasing resistor i.e.
One resistance R1, so that amplifying circuit 2 is more sensitive to the induced voltage of the base stage B input by the first triode Q1, in turn
More accurately detect the weak voltage of monitoring point；Meanwhile with light emitting diode D1 instead of the current collection of former total radio amplifier 2
Electrode resistance, the stability for enhancing circuit also make circuit easier.9014C type triode amplification factor is about 400 times, is passed through
After two-stage amplifying circuit 2, amplification factor is up to 16000 times.Cable surface after amplifying 16000 times by two-stage amplifying circuit 2
Induced voltage be enough to drive subsequent conditioning circuit, and then realize the monitoring to voltage change in cable indirectly.
As shown in figure 4, in the present embodiment, the photoelectric coupling circuit 3 include third transistor Q3, operational amplifier A,
Photo resistance R7；
The base stage of the third transistor Q3 passes sequentially through second resistance R2, the photo resistance R7 ground connection and by the
One capacitor C1 ground connection；The collector of the third transistor Q3 is sequentially connected with the 4th resistance R4 and power supply；
The emitter of the third transistor Q3 is grounded by the 6th resistance R6；
The base stage of the third transistor Q3 passes sequentially through 3rd resistor R3, the second capacitor C2, the 4th capacitor C4 or the 5th
Resistance R5 is connect with the input terminal of the operational amplifier A；
The base stage of the third transistor Q3 passes sequentially through 3rd resistor R3, the second capacitor C2 and the operational amplifier A
Input terminal connection；
The both ends of the coil are connect respectively with two output ends of the operational amplifier A to form closed circuit.
As shown in figure 5, the signaling device 4 includes signaling circuit, the signaling circuit includes the list of model PT2262
Piece machine, emitting head 7, switch DIP-4, the relay KY1 normally-closed contact be connected to the power supply closed circuit of the single-chip microcontroller
On, when the voltage of monitoring point is normal, photoelectric coupling circuit 3 drives relay KY1, and the normally-closed contact of relay KY1 is opened, cuts
Break the working power of the signaling circuit, when relay KY1 power loss, the normally-closed contact of relay KY1 is closed, the signaling electricity
The working power on road is connected, and signaling circuit, which starts to work normally, sends coding.The intrinsic frequency generated such as signaling circuit by crystal oscillator
Rate (such as 433MHZ) will be encoded and be sent by transmitting antenna.
As shown in fig. 6, further include several clips 6 being clipped on each monitoring point respectively in the present embodiment, it is described
Voltage sensor 1 is one-to-one to be arranged on the clip 6.
The present invention voltage sensor 1 is arranged on the clip 6, clip 6 is clipped in cable by setting clip 6
Voltage sensor 1 is installed on cable when insulating outer, so that voltage sensor is not necessarily to be directly accessed cable run, and then is not influenced
Primary circuit parameter guarantees the accuracy of detection.Preferably, the amplifying circuit 2, light emitting diode D1, photo resistance R7 are integrated
On the clip 6, clip 6 passes through the cable connection of 4 cores, including a pair of of power supply line and a pair with photoelectric coupling circuit 3
Signal wire.By the way that the amplifying circuit 2, light emitting diode D1, photo resistance R7 to be integrated on the clip 6, can extend
The connection distance of clip 6 and coupling circuit increases setting range of the invention.
In the present embodiment, signaling device 4 is wirelessly communicated using half-duplex mode with decoding apparatus 5, is had
The features such as farther out, communication speed is fast for communication distance, anti-interference strong.
In the present embodiment, display is provided in the decoding apparatus 5, the display is for showing decoded number
According to being both provided with coding on each clip 6, the data correspond to the number of the clip 6.Such as display screen shows 0001
Then explanation, which corresponds in the corresponding cable of No. 1 clip of circuit arrangement 6, does not have voltage.
As shown in fig. 7, being both provided with cabinet 10 on each test point, the corresponding clip 6 is all identified on cabinet 10
Number, on communication extension set 8, decoding apparatus 5 is arranged on communication host 9 setting of signaling device 4, test point A on cabinet 10,
B, C, D are on cable 11.
Currently, subway signal system equipment cable run path is indicated by drawing and tag identifier come whereabouts, electricity
Cable path is intricate, and theoretically see can satisfy most basic line route failure and looked by mark and cable pathway drawing
It looks for.But often because mark falls, identifies unintelligible specification disunity, mark or even mark mistake, personnel misunderstand and business
The reasons such as level cause trouble shoot to judge incorrectly or overlong time used, cannot quickly judge specific location restorer just
It is often used, is affected to subway normal operation.Through the invention can be when load equipment power off, quickly judgement is that load is set
Standby failure itself or cable line fault；And quickly judge that cable run is which section power-off or poor contact disconnect failure,
Greatly shorten breakdown judge and recovery time.Monitoring system mostly uses current monitoring mode currently on the market, can only judge a certain
There is power-off or broken string in whole cable, the present invention is not necessarily to access primary circuit by the way of voltage monitoring, not influence circuit parameter,
A whole cable, which can not only be monitored, also to be different sections by increasing monitoring point for a whole cable logical partitioning, to reduce
Fault coverage.Therefore, the present invention has higher promotion prospect and potential market.
The invention is not limited to above embodiment, if not departing from the present invention to various changes or modifications of the invention
Spirit and scope, if these modification and variations belong within the scope of claim and equivalent technologies of the invention, then this hair
It is bright to be also intended to encompass these changes and change.
Claims (10)
1. a kind of cable monitoring system characterized by comprising
Several voltage sensors being separately positioned on each monitoring point of cable, with the one-to-one connection of the voltage sensor
Detection device, the signaling device with the one-to-one connection of the detection device, decoding apparatus；
The voltage sensor is used to acquire the voltage signal on the monitoring point；
The detection device in the exception of the voltage signal for driving the signaling device to generate coding and being sent to institute
State decoding apparatus, wherein described to encode the position for being used to indicate the monitoring point；
The decoding apparatus receives the coding and decodes, to obtain and export the location information of the monitoring point.
2. cable monitoring system according to claim 1, which is characterized in that the detection device includes:
Amplifying circuit is connect with the output end of the voltage sensor, for amplifying the voltage signal.
3. cable monitoring system according to claim 2, which is characterized in that the detection device further include:
Light emitting diode is connect with the output end of the amplifying circuit, for the voltage signal according to the amplification received
It is luminous to carry out.
4. cable monitoring system according to claim 3, which is characterized in that the detection device further include:
Photoelectric coupling circuit is arranged between the light emitting diode and the signaling device, is used for the light emitting diode
Optical signal be converted into electric signal.
5. according to the described in any item cable monitoring systems of claim 4, which is characterized in that the detection device further include:
Relay, coil are connect with the output end of the photoelectric coupling circuit；Normally-closed contact is arranged on the signaling device, uses
The power supply of the signaling device is connected when power loss.
6. cable monitoring system according to claim 3, which is characterized in that the amplifying circuit include the first triode,
Second triode；
The base stage of first triode is connect by first resistor with the voltage sensor, and collector connects power supply, emitter
It is connect with the base stage of second triode；
The collector of second triode is sequentially connected with the light emitting diode and power supply, emitter ground connection.
7. cable monitoring system according to claim 4, which is characterized in that first triode and the second triode are
9014C type triode.
8. cable monitoring system according to claim 5, which is characterized in that the photoelectric coupling circuit includes the three or three pole
Pipe, operational amplifier, photo resistance；
The base stage of the third transistor passes sequentially through second resistance, photo resistance ground connection and is connect by first capacitor
Ground；The collector of the third transistor is sequentially connected with the 4th resistance and power supply；
The emitter of the third transistor passes through the 6th resistance eutral grounding；
The base stage of the third transistor passes sequentially through 3rd resistor, the second capacitor, the 4th capacitor or the 5th resistance and the fortune
Calculate the input terminal connection of amplifier；
The input terminal that the base stage of the third transistor passes sequentially through 3rd resistor, the second capacitor and the operational amplifier connects
It connects；
The both ends of the coil are connect respectively with two output ends of the operational amplifier to form closed circuit.
9. cable monitoring system according to claim 1, which is characterized in that further include:
Warning device is connect with the decoding apparatus, for issuing alarm signal when the decoding apparatus receives the coding.
10. cable monitoring system according to claim 1, which is characterized in that further include being clipped in each monitoring respectively
Several clips on point, the voltage sensor is one-to-one to be arranged on the clip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910904080.6A CN110514966A (en) | 2019-09-24 | 2019-09-24 | A kind of cable monitoring system |
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| CN201910904080.6A CN110514966A (en) | 2019-09-24 | 2019-09-24 | A kind of cable monitoring system |
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| CN111426914A (en) * | 2020-04-29 | 2020-07-17 | 刘莹雪 | 5G communication cable fault monitoring system |
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