CN110119108A - Underground power cable anti-violence damage on-line monitoring system and its detection method - Google Patents
Underground power cable anti-violence damage on-line monitoring system and its detection method Download PDFInfo
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- CN110119108A CN110119108A CN201910276358.XA CN201910276358A CN110119108A CN 110119108 A CN110119108 A CN 110119108A CN 201910276358 A CN201910276358 A CN 201910276358A CN 110119108 A CN110119108 A CN 110119108A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
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Abstract
The invention discloses underground power cable anti-violence damage on-line monitoring system and its detection methods.Video surveillance is widely used in the detection of power cable as a kind of common monitoring mode, but its cost is high.The present invention includes central processing unit, data processing terminal and radio reception device array.Radio reception device array includes the first radio reception device, the second radio reception device, third radio reception device and the 4th radio reception device.First radio reception device, the second radio reception device, third radio reception device and the 4th radio reception device include acoustic signals reception device, protection shell and installation panel.Acoustic signals reception device includes clock chip, sound transducer, controller, mounting plate, radio reception cylinder, wireless module and filter.3n radio reception device array is arranged successively along the length direction of underground power cable.The present invention receives the time difference of voice signal by four sound transducers, the precise positioning to the source of destruction is realized, so as to avoid underground power cable from being damaged.
Description
Technical field
The invention belongs to underground power cable on-line monitoring technique fields, and in particular to a kind of underground power cable anti-violence
Destroy on-line monitoring system and its detection method.
Background technique
On the basis of constructing smart city and beautification resident living environment, the overhead transmission line cable of avenue due to
Self-condition is limited and the beautiful of urban development needs, it will the power cable for being embedded in underground gradually replaces.But about electricity
The protection question of cable, each unit in charge of construction in city may have exchange loophole, so cause when mechanical equipment such as cutting machine,
When Mechanical Crushing hammer, excavator etc. take violent means to excavate ground construction, buried power cable may be by
It excavates and destroys, seriously affected construction safety and the normal safety utilization of electric power of city dweller of worker.
In recent years, in underground power cable protective survey field, video surveillance is wide as a kind of common monitoring mode
It is general to be applied on overhead transmission line and ground in the detection of power cables such as large stadium.It is different that R&D Professional is based on carrier signal
Often, GPRS is in conjunction with carrier wave, the signal transmission forms such as piezoelectricity line of force carrier wave is impaired, carries out on ground and the power cable of eminence
Tamper-proof video on-line monitoring.But in underground power cable protective survey, since the thickness of soil, signal transmission capabilities decline
Subtract, evaluation index validity is not high, the picture signal denoising factors such as mode difficulty, more difficult with video on-line monitoring.
Summary of the invention
The purpose of the present invention is to provide a kind of Novel underground power cable anti-violence damage on-line monitoring systems.
Underground power cable anti-violence damage on-line monitoring system of the present invention, including central processing unit, data processing terminal
With radio reception device array.The radio reception device array includes the first radio reception device, the second radio reception device, third radio reception device and the 4th radio reception
Device.First radio reception device, the second radio reception device, third radio reception device and the 4th radio reception device are close to underground power cable setting.Described
First radio reception device, the second radio reception device, third radio reception device and the 4th radio reception device include acoustic signals reception device, protection shell and
Panel is installed.Protection shell is fixed on installation panel.Acoustic signals reception device is mounted on installation panel, and is located at protection
In shell.
The acoustic signals reception device includes clock chip, sound transducer, controller, mounting plate, radio reception cylinder, nothing
Wire module and filter.The radio reception cylinder is funnel-shaped.Mounting plate is fixed in radio reception cylinder.Clock chip, sound transducer,
Controller, wireless module and filter are installed in mounting plate.The interface clock signal of clock chip and the clock of controller are defeated
Incoming interface connection.The signal output interface of sound transducer and the signal input interface of filter connect.The signal of filter is defeated
The connection of the voice signal input interface of outgoing interface and controller.The communication interface of wireless module and the communication output interface of controller
Connection.
The radio reception device array shares 3n.3n radio reception device array is successively arranged along the length direction of underground power cable
Column.3n radio reception device array is one group along itself orientation every three, is divided into n group.At n group radio reception device array and n data
Reason terminal respectively corresponds.Each wireless module in each radio reception device array with corresponding data processing terminal wireless telecommunications.N
Data processing terminal is wirelessly communicated with central processing unit.
Further, metal foil is enclosed on the outside of the protection shell.
Further, the surface of the first radio reception device power cable located underground.Second radio reception device is located underground
The side of power cable.The other side of third radio reception device and the 4th radio reception device power cable located underground arranged side by side.
Further, four controllers in same radio reception device array pass through serial communication.
Further, the data processing terminal module includes relay wireless transmitting device and 3 meters of gain antennas.Relaying
Radio transmitting device uses technical grade wireless router.3 meters of gain antennas are mounted on relay wireless transmitting device.It is upper wireless
Transmission module uses technical grade wireless router.The central processing unit includes host computer and upper wireless transport module.On
Position machine uses the PLC of model CPM2A-20CDR-D.The model DS1307 of the clock chip.The controller uses
The single-chip microcontroller of model Atmega328P.The model SX1278 of the wireless module.The model MT210- of the filter
1。
Further, underground power cable anti-violence damage on-line monitoring system of the present invention, further includes alarm module.It is described
Alarm module include loudspeaker and display screen.Loudspeaker and display screen are connect with central processing unit.
Further, the spacing of two neighboring radio reception device array be s, 60 meters≤s≤100 meter.
The detection method of the underground power cable anti-violence damage on-line monitoring system is specific as follows:
The monitoring method of the underground power cable anti-violence damage on-line monitoring system is as follows:
Step 1: synchronous first radio reception device, the second radio reception device, third radio reception device and the 4th radio reception device internal clock chip.The
Sound transducer in one radio reception device, the second radio reception device, third radio reception device and the 4th radio reception device persistently will test acoustic signals
Electric signal is converted through filter transfer to controller.
Step 2: when there is the destruction source for threatening underground power cable operation within the scope of 100 meters of underground power cable,
The feature sound wave that destruction source generates will propagate to closest at the radio reception device array in destruction source.Radio reception device array is as feature battle array
Column.
When the first radio reception device, the second radio reception device, third radio reception device and the 4th radio reception device detect feature sound wave, first is received
Controller in sound device, the second radio reception device, third radio reception device and the 4th radio reception device respectively by itself detect feature sound wave when
Carve t1、t2、t3、t4Central processing unit is transferred to by corresponding data processing terminal.
Step 3: establishing rectangular coordinate system in space at character array.First radio reception device, the second radio reception device, third are received
The coordinate value of sound transducer in sound device, the 4th radio reception device in space in rectangular coordinate system is respectively A (x1,y1,z1)、B
(x2,y2,z2)、C(x3,y3,z3)、D(x4,y4,z4).Coordinate value in the rectangular coordinate system in space in destruction source be S (x, y,
z).X, y, z are required to be obtained by calculation.
Step 4: establishing space analysis equation (1), (2), (3), (4)
(x-x1)2+(y-y1)2+(z-z1)2=m2 (1)
(x-x2)2+(y-y2)2+(z-z2)2=(m+ct12)2 (2)
(x-x3)2+(y-y3)2+(z-z3)2=(m+ct13)2 (3)
(x-x4)2+(y-y4)2+(z-z4)2=(m+ct14)2 (4)
Wherein, m be the first radio reception device in sound transducer to destruction source distance；C is acoustic wave propagation velocity；t12=t2-
t1；t13=t3-t1；t14=t4-t1。
Step 5: equation (1) is enabled to subtract equation (2) formula, and introduce intermediate quantity a1, obtain equation (5)；Enable equation (2) side of subtracting
Journey (3) formula, and introduce intermediate quantity a2, obtain equation (6)；It enables equation (3) subtract equation (4) formula, and introduces intermediate quantity a3, the side of obtaining
Journey (7): it enables equation (4) subtract equation (1) formula, and introduces intermediate quantity a4, obtain equation (8):
2(x2-x1)x+2(y2-y1)y+2(z2-z1)+2ct12M=a1 (5)
2(x3-x2)x+2(y3-y2)y+2(z3-z2)z+2m(ct13-ct12)=a2 (6)
2(x4-x3)x+2(y4-y3)y+2(z4-z3)z+2m(ct14-ct13)=a3 (7)
2(x1-x4)x+2(y1-y4)y+2(z1-z4)z-2mct14=a4 (8)
In formula (5), a1=(x2 2-x1 2)+(y2 2-y1 2)+(z2 2-z1 2)-(ct12)2；
In formula (6), a2=(x3 2-x2 2)+(y3 2-y2 2)+(z3 2-z2 2)+(ct12)2-(ct13)2；
In formula (7), a3=(x4 2-x3 2)+(y4 2-y3 2)+(z4 2-z3 2)+(ct13)2-(ct14)2；
In formula (8), a4=(x1 2-x4 2)+(y1 2-y4 2)+(z1 2-z4 2)+(ct14)2。
Step 6: equation (5), (6), (7), (8), which are turned to matrix form, obtains matrix equation (9):
Step 7: solution matrix equation (9), calculate in the rectangular coordinate system in space in destruction source coordinate S (x, y,
z)。
Further, the frequency of the feature sound wave is 300Hz~20KHz.
Further, in step 4, the value of c is 300m/s.
The invention has the advantages that:
1, the microphone array that the present invention is formed using four sound transducers in space different location, can be realized
Detection to the source of destruction, operation is simple, cost is relatively low, flexibility is big, greatly optimizes traditional audio frequency detecting devices.
2, the present invention receives the time difference of voice signal by four sound transducers, realizes to the accurate of the source of destruction
Positioning, so as to avoid underground power cable from being damaged.
3, the present invention be directed to violence damage when can generate with this feature of the feature sound wave of daily sound wave different frequency, significantly
Reduce false detection rate.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of single radio reception device array in the present invention；
Fig. 2 is the structural schematic diagram of acoustic signals reception device in the present invention；
Fig. 3 is the first radio reception device in the present invention, the second radio reception device, third radio reception device, the 4th radio reception device, destroys source in space
Schematic diagram in rectangular coordinate system.
Specific embodiment
Below in conjunction with attached drawing, the invention will be further described.
As shown in Figure 1, underground power cable anti-violence damage on-line monitoring system, including central processing unit, alarm module,
Data processing terminal and radio reception device array.Data processing terminal module includes relay wireless transmitting device and 3 meters of gain antennas.In
Technical grade wireless router is used after radio transmitting device.3 meters of gain antennas are mounted on relay wireless transmitting device.Centre
Managing device includes host computer and upper wireless transport module.Host computer uses the PLC of model CPM2A-20CDR-D.It is upper wireless
Transmission module uses technical grade wireless router.Radio reception device array includes the first radio reception device Mic1, the second radio reception device Mic2, third
Radio reception device Mic3 and the 4th radio reception device Mic4.The surface of first radio reception device Mic1 power cable 1 located underground.Second radio reception device
The side of Mic2 power cable 1 located underground.Third radio reception device Mic3 and the 4th radio reception device Mic4 arranged side by side is located underground
The other side of power cable 1.
First radio reception device Mic1, the second radio reception device Mic2, third radio reception device Mic3 and the 4th radio reception device Mic4 include sound
Wave signal receiving device 2, protection shell 3 and installation panel 4.It protects shell 3 cylindrical, and is fixed on installation panel 4.Sound
Wave signal receiving device 2 is mounted on installation panel 4, and is located in protection shell 3.The outside of protection shell 3 is enclosed with metal
Foil.The preferred copper foil of metal foil, sound wave can be effectively improved by applying copper foil layer on protection shell based on the principle of electromagnetic shielding
The ability of 2 electromagnetism interference of signal receiving device.
As shown in Fig. 2, acoustic signals reception device 2 includes clock chip 2-1, sound transducer 2-2, controller 2-3, peace
Loading board 2-4, radio reception cylinder 2-5, wireless module 2-6, filter 2-7 and power supply module.The model DS1307 of clock chip 2-1.
Controller uses the single-chip microcontroller of model Atmega328P.The model SX1278 of wireless module 2-6.The model of filter 2-7
For MT210-1.Radio reception cylinder 2-5 is funnel-shaped, is fixed in protection shell 3, can play the role of converging sound.Mounting plate 2-
4 are fixed in radio reception cylinder 2-5.Clock chip 2-1, sound transducer 2-2, controller 2-3, wireless module 2-6, filter 2-7
And power supply module is installed in mounting plate 2-4.Power supply module is clock chip 2-1, sound transducer 2-2, controller 2-3, nothing
Wire module 2-6 and filter 2-7 power supply.The interface clock signal of clock chip 2-1 and the clock input interface of controller 2-3 connect
It connects.The signal output interface of sound transducer 2-2 is connect with the signal input interface of filter 2-7.The signal of filter 2-7 is defeated
Outgoing interface is connect with the voice signal input interface of controller 2-3.The communication interface of wireless module 2-6 and leading to for controller 2-3
Believe output interface connection.Four controller 2-3 in same radio reception device array pass through serial communication.
Radio reception device array shares 3n.3n radio reception device array is arranged successively along the length direction of underground power cable 1.Phase
The spacing of adjacent two radio reception device arrays is s, s=80 meters.3n radio reception device array is one group along itself orientation every three, point
For n group.N group radio reception device array is respectively corresponded with n data processing terminal.Each wireless module 2-6 in each radio reception device array
With corresponding data processing terminal wireless telecommunications.N data processing terminal with wireless transmission mould upper in central processing unit
Wireless communication.Alarm module includes loudspeaker and display screen.Loudspeaker and display screen are connect with central processing unit.
The monitoring method of the 1 anti-violence damage on-line monitoring system of underground power cable is as follows:
Step 1: by the first radio reception device Mic1, the second radio reception device Mic2, third radio reception device Mic3 and the 4th radio reception device Mic4
It is synchronous that internal clock chip 2-1 is set as real-time clock.First radio reception device Mic1, the second radio reception device Mic2, third radio reception device Mic3
It persistently will test acoustic signals conversion electric signal with the sound transducer 2-2 in the 4th radio reception device Mic4 to pass through filter 2-7
It is defeated by controller 2-3.
Step 2: when there is the destruction source operation within the scope of 1100 meters of underground power cable for threatening underground power cable 1
When, the feature sound wave that destruction source generates will propagate to closest at the radio reception device array in destruction source.Radio reception device array is as feature
Array.Destruction source includes cutting machine, Mechanical Crushing hammer and excavator, and violence digger is carried out near underground power cable 1
When making, it is easy to hurt underground power cable 1.Feature frequency of sound wave of the frequency of sound wave that destruction source generates in 300Hz~10KHz
In section.The frequency of feature sound wave is 300Hz~20KHz.
When the first radio reception device Mic1, the second radio reception device Mic2, third radio reception device Mic3 and the 4th radio reception device Mic4 are detected
When feature sound wave of the frequency between 300Hz~20KHz, the first radio reception device Mic1, the second radio reception device Mic2, third radio reception device
Controller 2-3 in Mic3 and the 4th radio reception device Mic4 is respectively by t at the time of itself detecting feature sound wave1、t2、t3、t4Pass through
Corresponding data processing terminal is transferred to central processing unit.
Step 3: as shown in figure 3, establishing rectangular coordinate system in space at character array.First radio reception device Mic1, second
Radio reception device Mic2, third radio reception device Mic3, the sound transducer 2-2 in the 4th radio reception device Mic4 are in space in rectangular coordinate system
Coordinate value be respectively A (x1,y1,z1)、B(x2,y2,z2)、C(x3,y3,z3)、D(x4,y4,z4).Destruction source it is straight in space
Coordinate value in angular coordinate system is S (x, y, z).X, y, z are required to be obtained by calculation.
Step 4: establishing space analysis equation (1), (2), (3), (4)
(x-x1)2+(y-y1)2+(z-z1)2=m2 (1)
(x-x2)2+(y-y2)2+(z-z2)2=(m+ct12)2 (2)
(x-x3)2+(y-y3)2+(z-z3)2=(m+ct13)2 (3)
(x-x4)2+(y-y4)2+(z-z4)2=(m+ct14)2 (4)
Wherein, m be the first radio reception device Mic1 in sound transducer 2-2 to destruction source distance；C is acoustic wave propagation velocity,
It is set as 300m/s (transmission speed is lower than transmission speed in air to sound wave in the soil)；t12=t2-t1；t13=t3-t1；t14
=t4-t1。
Step 5: equation (1) is enabled to subtract equation (2) formula, and introduce intermediate quantity a1, obtain equation (5)；Enable equation (2) side of subtracting
Journey (3) formula, and introduce intermediate quantity a2, obtain equation (6)；It enables equation (3) subtract equation (4) formula, and introduces intermediate quantity a3, the side of obtaining
Journey (7): it enables equation (4) subtract equation (1) formula, and introduces intermediate quantity a4, obtain equation (8):
2(x2-x1)x+2(y2-y1)y+2(z2-z1)+2ct12M=a1 (5)
2(x3-x2)x+2(y3-y2)y+2(z3-z2)z+2m(ct13-ct12)=a2 (6)
2(x4-x3)x+2(y4-y3)y+2(z4-z3)z+2m(ct14-ct13)=a3 (7)
2(x1-x4)x+2(y1-y4)y+2(z1-z4)z-2mct14=a4 (8)
In formula (5), a1=(x2 2-x1 2)+(y2 2-y1 2)+(z2 2-z1 2)-(ct12)2；
In formula (6), a2=(x3 2-x2 2)+(y3 2-y2 2)+(z3 2-z2 2)+(ct12)2-(ct13)2；
In formula (7), a3=(x4 2-x3 2)+(y4 2-y3 2)+(z4 2-z3 2)+(ct13)2-(ct14)2；
In formula (8), a4=(x1 2-x4 2)+(y1 2-y4 2)+(z1 2-z4 2)+(ct14)2。
Step 6: equation (5), (6), (7), (8), which are turned to matrix form, obtains matrix equation (9):
Step 7: solution matrix equation (9), calculate in the rectangular coordinate system in space in destruction source coordinate S (x, y,
z)。
Step 8: central processing unit shows the location transmission in source of destroying to display screen, loudspeaker issues prompt tone,
Enable staff to handle destruction source in time, is damaged to avoid underground power cable 1.
Claims (10)
1. underground power cable anti-violence damage on-line monitoring system, including central processing unit, data processing terminal and radio reception device
Array；It is characterized by: the radio reception device array includes the first radio reception device, the second radio reception device, third radio reception device and the 4th receipts
Sound device；First radio reception device, the second radio reception device, third radio reception device and the 4th radio reception device are close to underground power cable setting；It is described
The first radio reception device, the second radio reception device, third radio reception device and the 4th radio reception device include acoustic signals reception device, protection shell
With installation panel；Protection shell is fixed on installation panel；Acoustic signals reception device is mounted on installation panel, and is located at and is protected
It protects in shell；
The acoustic signals reception device includes clock chip, sound transducer, controller, mounting plate, radio reception cylinder, wireless mould
Block and filter；The radio reception cylinder is funnel-shaped；Mounting plate is fixed in radio reception cylinder；Clock chip, sound transducer, control
Device, wireless module and filter are installed in mounting plate；The clock input of the interface clock signal and controller of clock chip connects
Mouth connection；The signal output interface of sound transducer and the signal input interface of filter connect；The signal output of filter connects
Mouth is connect with the voice signal input interface of controller；The communication interface of wireless module and the communication output interface of controller connect
It connects；
The radio reception device array shares 3n；3n radio reception device array is arranged successively along the length direction of underground power cable；
3n radio reception device array is one group along itself orientation every three, is divided into n group；N group radio reception device array is whole with n data processing
End respectively corresponds；Each wireless module in each radio reception device array with corresponding data processing terminal wireless telecommunications；N data
Processing terminal is wirelessly communicated with central processing unit.
2. underground power cable anti-violence damage on-line monitoring system according to claim 1, it is characterised in that: the guarantor
Metal foil is enclosed on the outside of shield shell.
3. underground power cable anti-violence damage on-line monitoring system according to claim 1, it is characterised in that: described
The surface of first radio reception device power cable located underground；The side of second radio reception device power cable located underground；It is arranged side by side
Third radio reception device and the 4th radio reception device power cable located underground the other side.
4. underground power cable anti-violence damage on-line monitoring system according to claim 1, it is characterised in that: same receipts
Four controllers in sound device array pass through serial communication.
5. underground power cable anti-violence damage on-line monitoring system according to claim 1, it is characterised in that: described
Data processing terminal module includes relay wireless transmitting device and 3 meters of gain antennas；Relay wireless transmitting device uses technical grade
Wireless router；3 meters of gain antennas are mounted on relay wireless transmitting device；Upper wireless transport module is wireless using technical grade
Router；The central processing unit includes host computer and upper wireless transport module；Host computer uses model CPM2A-
The PLC of 20CDR-D；The model DS1307 of the clock chip；The controller uses the list of model Atmega328P
Piece machine；The model SX1278 of the wireless module；The model MT210-1 of the filter.
6. underground power cable anti-violence damage on-line monitoring system according to claim 1, it is characterised in that: the present invention
Underground power cable anti-violence damage on-line monitoring system, further includes alarm module；The alarm module include loudspeaker and
Display screen；Loudspeaker and display screen are connect with central processing unit.
7. underground power cable anti-violence damage on-line monitoring system according to claim 1, it is characterised in that: adjacent two
The spacing of a radio reception device array be s, 60 meters≤s≤100 meter.
8. the detection method of underground power cable anti-violence damage on-line monitoring system as described in claim 1, feature exist
In: Step 1: synchronous first radio reception device, the second radio reception device, third radio reception device and the 4th radio reception device internal clock chip；First radio reception
Sound transducer in device, the second radio reception device, third radio reception device and the 4th radio reception device persistently will test acoustic signals conversion electricity
Signal is through filter transfer to controller；
Step 2: being destroyed when there is the destruction source for threatening underground power cable operation within the scope of 100 meters of underground power cable
The feature sound wave that source generates will propagate to closest at the radio reception device array in destruction source；Radio reception device array is as character array；
When the first radio reception device, the second radio reception device, third radio reception device and the 4th radio reception device detect feature sound wave, the first radio reception
Controller in device, the second radio reception device, third radio reception device and the 4th radio reception device respectively by feature sound wave itself is detected at the time of
t1、t2、t3、t4Central processing unit is transferred to by corresponding data processing terminal；
Step 3: establishing rectangular coordinate system in space at character array；First radio reception device, the second radio reception device, third radio reception device,
The coordinate value of sound transducer in 4th radio reception device in space in rectangular coordinate system is respectively A (x1,y1,z1)、B(x2,y2,
z2)、C(x3,y3,z3)、D(x4,y4,z4)；Coordinate value in the rectangular coordinate system in space in destruction source is S (x, y, z)；x,y,
Z is required to be obtained by calculation；
Step 4: establishing space analysis equation (1), (2), (3), (4)
(x-x1)2+(y-y1)2+(z-z1)2=m2 (1)
(x-x2)2+(y-y2)2+(z-z2)2=(m+ct12)2 (2)
(x-x3)2+(y-y3)2+(z-z3)2=(m+ct13)2 (3)
(x-x4)2+(y-y4)2+(z-z4)2=(m+ct14)2 (4)
Wherein, m be the first radio reception device in sound transducer to destruction source distance；C is acoustic wave propagation velocity；t12=t2-t1；t13
=t3-t1；t14=t4-t1；
Step 5: equation (1) is enabled to subtract equation (2) formula, and introduce intermediate quantity a1, obtain equation (5)；Equation (2) is enabled to subtract equation (3)
Formula, and introduce intermediate quantity a2, obtain equation (6)；It enables equation (3) subtract equation (4) formula, and introduces intermediate quantity a3, obtain equation (7):
It enables equation (4) subtract equation (1) formula, and introduces intermediate quantity a4, obtain equation (8):
2(x2-x1)x+2(y2-y1)y+2(z2-z1)+2ct12M=a1 (5)
2(x3-x2)x+2(y3-y2)y+2(z3-z2)z+2m(ct13-ct12)=a2 (6)
2(x4-x3)x+2(y4-y3)y+2(z4-z3)z+2m(ct14-ct13)=a3 (7)
2(x1-x4)x+2(y1-y4)y+2(z1-z4)z-2mct14=a4 (8)
In formula (5), a1=(x2 2-x1 2)+(y2 2-y1 2)+(z2 2-z1 2)-(ct12)2；
In formula (6), a2=(x3 2-x2 2)+(y3 2-y2 2)+(z3 2-z2 2)+(ct12)2-(ct13)2；
In formula (7), a3=(x4 2-x3 2)+(y4 2-y3 2)+(z4 2-z3 2)+(ct13)2-(ct14)2；
In formula (8), a4=(x1 2-x4 2)+(y1 2-y4 2)+(z1 2-z4 2)+(ct14)2；
Step 6: equation (5), (6), (7), (8), which are turned to matrix form, obtains matrix equation (9):
Step 7: solution matrix equation (9), calculates the coordinate S (x, y, z) in the rectangular coordinate system in space in destruction source.
9. the detection method of underground power cable anti-violence damage on-line monitoring system according to claim 8, feature
Be: the frequency of the feature sound wave is 300Hz~20KHz.
10. the detection method of underground power cable anti-violence damage on-line monitoring system according to claim 8, feature
Be: in step 4, the value of c is 300m/s.
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