CN102538725A - Method and device for measuring laid length of any section of buried cable - Google Patents
Method and device for measuring laid length of any section of buried cable Download PDFInfo
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- CN102538725A CN102538725A CN2011104555176A CN201110455517A CN102538725A CN 102538725 A CN102538725 A CN 102538725A CN 2011104555176 A CN2011104555176 A CN 2011104555176A CN 201110455517 A CN201110455517 A CN 201110455517A CN 102538725 A CN102538725 A CN 102538725A
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Abstract
The invention discloses a method and device for measuring the laid length of any section of a buried cable. The method is characterized by comprising the following steps: an output terminal of a terminal machine is connected with a core wire at a certain end of a cable to be measured, and frequency modulation (FM) radio station antennae are erected on the ground to facilitate communication; an on-site machine moves to any point on the ground along the burying direction of the cable to be measured, is electrified to start up, and then starts measuring through off-site coordination by voice; the on-site machine sends time synchronization reference pulses to the off-site terminal machine and receives the synchronization reference pulses and the transmitting reference pulses generated by the triggering of the synchronization reference pulses fed back by the terminal machine by adopting free-space FM waves, so as to determine the transmitting time basic point of the terminal machine in an off-site manner; the on-site machine receives the electromagnetic wave signals generated in a manner that the terminal machine is radiated by the pipeline of the cable to be measured, through an antenna 2, so as to determine the time difference in the transmission of electromagnetic waves from the certain end of the cable to be measured to the point where the on-site machine is located; analysis and compensation are carried out by combining the transmission speed and the error factors of the electromagnetic waves in the cable medium; and the actual laid length of the measured section of the buried cable is displayed and provided.
Description
Technical field
The present invention relates to a kind of method of measuring and device thereof to underground cable any section laying length; Particularly to power cable; No matter be good cable, or the failure cable of operation; When its data is unclear, adopt this device can measure out the actual cable laying length that the cable trace top is a bit arrived a certain termination or any point-to-point transmission arbitrarily rapidly.
Background technology
In power cable construction and maintenance, need know the actual laying length of a certain location point in underground cable or raceway groove cable trace top usually to cable termination or top, clearly under the condition, the employing meter counter is measured in the cable burial path; And under the unclear condition in cable burial path, often lean on experience and the exploratory appraisal of impression.The shortcoming of the method shows two aspects; First existence is not only measured precision and is difficult to satisfy actual needs; And exist implementation process slow be difficult to confirm the actual laying length of location point, have above particularly unclear, the cable trace under the complex environment of inconvenience such as barrier to be difficult to carry out in data; It two is because most of cable burial is that surplus coiling is arranged more, is difficult to calculating when ground is measured.
Application number is that 200610041725.0 Chinese patent discloses a kind of " measuring method of built-in length of metal pipeline and device thereof "; This method strange land x time confirms it is the principle that adopts the synchronous clock comparison of two calibrations; Its major defect is higher to the precision of two synchronous clocks and degree of stability and coherence request, and the principle of device circuit is complicated, equipment cost is high, anti-interference is relatively poor, the taming time of clock synchronization is long etc.
Summary of the invention
The production that The present invention be directed to existing patented technology " measuring method of built-in length of metal pipeline and device thereof " with use in exposed problems and new principle method and the improved new equipment invented.
For reaching above purpose, the present invention takes following technical scheme to be achieved:
A kind of method of measuring of underground cable any section laying length is characterized in that, comprises the steps:
(1) the termination machine being measured lead-out terminal is connected with the heart yearn of a certain termination K of tested cable; Termination machine ground terminal is connected with tested cable system ground; The frequency modulation intercommunication radio station antenna 3 of termination machine sets up ground and is convenient to communication position, and the port of will supplying power inserts the 220V civil power;
(2) open the dynamo-electric source switch in termination and make it be in the stand-by operation state, signal classification processing circuit working state wherein at first is in " conversation " state, changes " measurement " state again over to by on-the-spot machine notice;
(3) on-the-spot machine is moved to ground, any 1 M top along the direction of burying underground of tested cable; Open on-the-spot dynamo-electric source switch; The on-the-spot machine frequency modulation intercommunication of inspection adjustment radio station makes the classification processing circuit working state switch of on-the-spot machine be in " conversation " state, at first talk with normally with termination machine duty personnel after; The notice one of which works " measurement " state that changes over to; Begun to measure by on-the-spot machine operation key control, the time synchronized basic pulse that on-the-spot machine produces begins counting by each road mistiming counter of cycle T r repeated priming, simultaneously through on-the-spot machine frequency modulation intercommunication radio station and day alignment termination machine transmitting time synchronous base pulse; After the termination machine receives the synchronous base pulse by its antenna and frequency modulation intercommunication radio station; Triggering for generating electromagnetic wave measurement signal is launched through tested cable, the synchronous base pulse of shaping and the transmitted reference pulse signal of generation after it receives through the frequency modulation intercommunication radio station and the on-the-spot machine loopback of day alignment of termination machine simultaneously; On-the-spot machine stops the counting of its corresponding mistiming counter respectively behind the synchronous base pulse of its antenna and the reception termination machine loopback of frequency modulation intercommunication radio station and transmitted reference pulse signal; On 1 M in land cable path; Measure the counting that receiving circuit receives its mistiming counter of electromagnetic wave measurement signal terminating of tested cable metal pipeline radiation through on-the-spot machine antenna and on-the-spot machine; And read various time difference measurements values and signal waveform sampled value automatically; Carry out signal analysis, various error compensation and measure calculating and data preservation, export the data of burying between direction any one M actual cable laying length L of a certain termination K of tested cable to tested cable through display;
(4) adopt step (1)～(3) method record on-the-spot machine along tested cable bury that direction moves to another N K apart from the termination arbitrarily underground bury cable physical length L ' underground, ask difference promptly to obtain the length of burying cable underground between any 2 M, N on the direction of burying underground of tested cable the cable length of burying underground that records two points.
A kind of device of measuring that adopts said method; Comprise the termination machine that is connected with the heart yearn of a certain termination K of tested cable, along the on-the-spot machine that direction moves to ground, any 1 M top of burying underground of tested cable; On-the-spot machine comprises that crystal oscillator produces high-frequency signal and send control survey circuit CPU; Producing the required high-frequency impulse of sample count, produce the low-frequency cycle through the shaping frequency division through shaping is the time synchronized basic pulse of Tr; Send the first frequency modulation intercommunication radio station through the first signal classification processing circuit, launch by first antenna;
The termination machine comprises that the third antenna and the second frequency modulation intercommunication radio station receive the synchronous base pulse of on-the-spot machine emission; Send control circuit through secondary signal classification processing circuit; The transmitted reference pulse that control circuit is produced by the synchronous base trigger action that receives; Power controlling source circuit and measurement radiating circuit are through tested cable socket K launching electromagnetic wave measuring-signal, simultaneously through the synchronous base pulse of secondary signal classification processing circuit, the second frequency modulation intercommunication radio station and third antenna shaping after its reception of on-the-spot machine loopback and the transmitted reference pulse of triggering for generating;
On-the-spot machine receives the synchronous base pulse and the transmitted reference pulse of termination machine loopback through first antenna and the first frequency modulation intercommunication radio station; Send control survey circuit CPU through the first signal classification processing circuit again; On-the-spot machine is through second antenna and measure the electromagnetic wave measurement signal that receiving circuit receives tested cable radiation; Send control survey circuit CPU; CPU carries out each time difference measurements, sampled signal analysis and error compensation, finally send display to export tested cable socket K to the physical length L data of laying between on-the-spot machine M point of living in.
In the said apparatus, said on-the-spot machine comprises memory and communication port, and through operation keyboard control, memory is used to preserve signal waveform and the computational data that records, and communication port is used for signal waveform that is kept at memory and computational data are printed or called.
Said termination machine separates and combiner circuit with the signal classification processing circuit employing time domain in the on-the-spot machine, and " conversation " wherein switched the conversation or the measurement synchronization pulse signal of frequency modulation communication transmission with " measurement " two kinds of duties by the control of alternative bidirectional analog switch.This classification processing circuit also can adopt frequency domain to separate and combiner circuit; The conversation of frequency modulation communication transmission separates with the summing amplifier frequency domain with synthetic through high and low pass filter with the measurement synchronization pulse signal, no longer needs to be provided with separately " conversation " and " measurement " two kinds of duty switches.
Compared with prior art; Measuring method of the present invention has thoroughly been abandoned confirming method by the strange land x time basic point of two clock synchronization principles; Adopt and pass through the free space frequency-modulated wave, and then the new method of x time basic point is confirmed in the strange land to strange land equipment transmitting time synchronous base pulse, the time synchronized basic pulse that receives the strange land sent back by equipment and the transmitted reference pulse of its triggering for generating.Frequency modulation intercommunication radio station be used to realize to converse time domain or frequency-region signal classification processing principle with the strange land transmitting function of two types of different purposes signals of measurement synchronization pulse.Have and accurately to measure the arbitrary specified point of underground cable to the actual laying length of underground cable between a certain end points or wantonly two specified points, the advantage of use shortcut and simple.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed description.
Fig. 1 is the work synoptic diagram of the inventive method.
Fig. 2 is the related functional block diagram of measuring device of the inventive method.Wherein (a) figure is a termination machine structured flowchart; (b) figure is on-the-spot machine structured flowchart.
Fig. 3 is two instantiation schematic diagrams of signal classification processing circuit among Fig. 2.Wherein (a) figure is that time domain is separated and the combiner circuit schematic diagram; (b) figure is that frequency domain separates and the combiner circuit schematic diagram.
Fig. 4 is that the inventive method time measurement pulse concerns synoptic diagram.
Embodiment
As shown in Figure 1, the related underground cable of the inventive method is measured device and is made up of termination machine and on-the-spot machine two parts.Through the contact of wireless frequency modulation intercommunication radio station, frequency modulation intercommunication radio station is used to realize to the strange land transmitting function of conversation with two types of different purposes signals of measurement synchronization pulse between termination machine and the on-the-spot machine.
Measure step:
(1) by shown in Figure 1 termination machine measurement lead-out terminal is connected with the heart yearn of a certain termination K of tested cable; Termination machine ground terminal is connected with tested cable system ground; Machine frequency modulation intercommunication radio station, termination antenna 3 sets up ground and is convenient to communication position, and the port of will supplying power inserts the 220V civil power;
(2) opening the dynamo-electric source switch in termination is in it to treat duty (to adopting Fig. 3 structure one signal classification processing circuit, the duty switch at first is in " conversation " state, notifies " measurement " state that changes over to again by on-the-spot machine);
(3) on-the-spot machine is moved to ground, any 1 M top as shown in fig. 1 along the direction of burying underground of tested cable; Turn on the power switch; Inspection adjustment frequency modulation intercommunication radio station makes the normal back of dialogue (to adopting Fig. 3 structure one signal classification processing circuit; The duty switch be in " conversation " state at first with termination machine duty personnel talk with normal after, the notice one of which works " measurements " state that changes over to), by operating key control beginning measurement; The time synchronized basic pulse that on-the-spot machine produces begins counting by each road mistiming counter of cycle T r repeated priming, simultaneously through frequency modulation intercommunication radio station and antenna 1 be termination machine transmitting time synchronous base pulse in the air; After the termination machine receives the synchronous base pulse by its antenna 3 and frequency modulation intercommunication radio station, by its triggering for generating electromagnetic wave measurement signal through tested cable launch, simultaneously through frequency modulation intercommunication radio station and the synchronous base pulse of antenna 3 shaping after its reception of on-the-spot machine loopback and the transmitted reference pulse signal of generation; On-the-spot machine receives the synchronous base pulse of termination machine loopback and the counting that the transmitted reference pulse signal stops its corresponding mistiming counter respectively through antenna 1 and frequency modulation intercommunication radio station; On 1 M in land cable path through antenna 2 and measure the counting that receiving circuit receives its mistiming counter of electromagnetic wave measurement signal terminating of tested cable metal pipeline radiation; And read various time difference measurements values and signal waveform sampled value automatically, carry out signal analysis, various error compensation preserves with measuring to calculate with data, exports the data of burying between direction any one M actual cable laying length L of a certain termination K of tested cable to tested cable through LCD;
(4) with (1)～(3) steps can record on-the-spot machine along tested cable bury that direction moves to any 1 N as shown in fig. 1 K apart from the termination underground bury cable physical length L ' underground, ask difference promptly to obtain the cable length of burying underground between any 2 M, N of burying underground on the direction of tested cable the cable length of burying underground that records two points.
As shown in Figure 2; The termination machine is mainly accomplished through frequency modulation intercommunication radio station and on-the-spot machine speech exchange, is received and time synchronized basic pulse that the on-the-spot machine of loopback sends, give the transmitted reference pulse of on-the-spot machine loopback by the time synchronized basic pulse triggering for generating that receives, through tested cable launching electromagnetic wave measuring-signal; On-the-spot machine is mainly accomplished and is produced sample count pulse and time synchronized basic pulse; Through frequency modulation intercommunication radio station and termination machine speech exchange with to termination machine transmitting time synchronous base pulse, receive the time synchronized basic pulse and the transmitted reference pulse of the on-the-spot machine of termination machine loopback; Ground receives the electromagnetic wave measurement signal of tested cable metal pipeline radiation above institute's cable trace any point that buries; Automatically carry out signal analysis, various time difference measurements and error compensation, finally through LCD export on-the-spot machine position to termination that machine connects, termination or on-the-spot machine point-to-point transmission of living in respectively bury the physical length of cable underground.
As shown in Figure 3; The termination machine is different with the strange land transmission side communication formula of two types of different purposes signals of measurement synchronization pulse to conversation with the signal classification processing circuit in the on-the-spot machine; Comprise two kinds of optional structural circuits; (a) figure is first kind of structural circuit form among Fig. 3; It is the time domain mask work principle that adopts two types of different purposes signals; " conversation " wherein switched the conversation or measurement synchronization pulse (time synchronized basic pulse and the transmitted reference pulse general name) signal of frequency modulation communication transmission with " measurement " two kinds of duties by the control of alternative bidirectional analog switch; Be characterized in that circuit theory and simple in structure, conversation and measurement synchronization pulse occur separately respectively and be independent of each other under corresponding " conversation " and " measurements " duty, in the measuring process between two machines of strange land communication need the next air time arrange or by another communication tool.
(b) figure is second kind of structural circuit form among Fig. 3; It is to adopt frequency domain to separate and composition principle; The conversation of frequency modulation communication transmission separates with the summing amplifier frequency domain with synthetic through high and low pass filter with the measurement synchronization pulse signal; Also promptly adopt to be divided into the following half-band width of transferring voice and first bandwidth of transmission measurement synchronizing pulse after the output audio bandwidth of FM radio station suitably widened, filtering sorting respectively before and after signal transmits, reach the purpose of separating two types of different purposes signals.No longer need to be provided with " conversation " and " measurement " two kinds of duty switches.Be characterized in that circuit theory and structure are complicated, conversation and measurement synchronization pulse transmit simultaneously that the selectivity of wave filter is had relatively high expectations, implements in the process of measuring between two machines of strange land coordination is convenient.
As shown in Figure 4, measure device for underground cable of the present invention and split under " measurement " state of situation, time measurement pulse relation in " conversation " and " measurement " duty.In conjunction with among Fig. 2 the A that marks to the J point; The principle of work that this underground cable is measured device can be stated as: underground cable is measured device and is connected by Fig. 1; After energising gets into " measurement " state; The crystal oscillator of on-the-spot machine produces high-frequency signal and send control survey circuit CPU, and producing the required high-frequency impulse of sample count, produce the low-frequency cycle through the shaping frequency division through shaping is the time synchronized basic pulse of Tr, and the synchronous base pulse is except that as sending frequency modulation intercommunication radio station through signal classification processing circuit the time counting initial pulse; To launching in the air, A, 2 respective waveforms of B are seen Fig. 4 (a) among Fig. 2 by antenna 1; The termination machine send control circuit by its antenna 3 and the synchronous base pulse that frequency modulation intercommunication radio station receives through signal classification processing circuit; C, 2 respective waveforms of D are seen Fig. 4 (b) among Fig. 2; Control circuit is by the transmitted reference pulse of the time synchronized basic pulse triggering for generating that receives; Power controlling source circuit and measurement radiating circuit are through tested cable launching electromagnetic wave measuring-signal; Through the synchronous base pulse of signal classification processing circuit, frequency modulation intercommunication radio station and antenna 3 shaping after its reception of on-the-spot machine loopback and the transmitted reference pulse signal of generation, E point respective waveforms is seen Fig. 4 (c) among Fig. 2 simultaneously, and F, 2 respective waveforms of G are seen Fig. 4 (d) among Fig. 2; On-the-spot machine receives the synchronous base pulse and the transmitted reference pulse signal of termination machine loopback through antenna 1 and frequency modulation intercommunication radio station, send control survey circuit CPU through signal classification processing circuit again, and H, 2 respective waveforms of I are seen Fig. 4 (e) among Fig. 2; On-the-spot machine is through antenna 2 and measure receiving circuit receives the radiation of tested cable metal pipeline on 1 M in land cable path electromagnetic wave measurement signal and send the control survey circuit, and J point respective waveforms is seen Fig. 4 (f) among Fig. 2; CPU carries out various time difference measurements, sampled signal analysis and error compensation automatically; Final liquor charging crystal display is exported tested cable socket K shown in Figure 1 to the physical length L data of laying between on-the-spot machine M point of living in; Can send memory to preserve signal waveform that records and computational data through operation keyboard control, the signal waveform and the computational data that maybe will be kept in the memory be printed or are called through communication port.
Be different from it among B among Fig. 2 when signal classification processing circuit adopts structure two, C, G, 4 respective waveforms of H and Fig. 4 and sneaked into conversation audio frequency signal waveform, these 4 respective waveforms only have the intercommunication audio frequency signal waveform of conversing when adopting " conversation " state of structure one.
Measure the calculating principle: after establishing the on-the-spot chance error difference compensation that is on any point M of tested cable burial path, the synchronous base pulse that records its generation to the mistiming of the synchronous base pulse of reception termination machine loopback be Δ t
1, to the mistiming of the transmitted reference pulse that receives termination machine loopback be Δ t
2, to the mistiming that receives tested cable pipeline radiated electromagnetic wave signal be Δ t
3, the transmission speed of electromagnetic wave in this cable dielectric is v, and the minute relation is as shown in Figure 4, and then on-the-spot machine records the mistiming Δ t of synchronous base pulse to the transmitted reference pulse
0Following with survey cable socket termination that machine connects to the computing formula of the cable physical length L at on-the-spot machine place:
Δt
0＝Δt
1/2+(Δt
2-Δt
1)＝Δt
2-Δt
1/2……………………………(1)
L＝(Δt
3-Δt
0)v＝(Δt
3+Δt
1/2-Δt
2)v?……………………………(2)?。
Claims (5)
1. the method for measuring of a underground cable any section laying length is characterized in that, comprises the steps:
(1) the termination machine being measured lead-out terminal is connected with the heart yearn of a certain termination K of tested cable; Termination machine ground terminal is connected with tested cable system ground; The frequency modulation intercommunication radio station antenna installation of termination machine is convenient to communication position to ground, and the port of will supplying power inserts the 220V civil power;
(2) open the dynamo-electric source switch in termination and make it be in the stand-by operation state, signal classification processing circuit working state wherein at first is in " conversation " state, changes " measurement " state again over to by on-the-spot machine notice;
(3) on-the-spot machine is moved to ground, any 1 M top along the direction of burying underground of tested cable; Open on-the-spot dynamo-electric source switch; The frequency modulation intercommunication radio station of the on-the-spot machine of inspection adjustment makes the classification processing circuit working state switch of on-the-spot machine be in " conversation " state, at first talk with normally with termination machine duty personnel after; The notice one of which works " measurement " state that changes over to; Begun to measure by on-the-spot machine operation key control, the time synchronized basic pulse that on-the-spot machine produces begins counting by each road mistiming counter of cycle T r repeated priming, simultaneously through on-the-spot machine frequency modulation intercommunication radio station and antenna 1 to termination machine transmitting time synchronous base pulse; After the termination machine receives the synchronous base pulse by the antenna of termination machine and frequency modulation intercommunication radio station; Triggering for generating electromagnetic wave measurement signal is launched through tested cable, the synchronous base pulse of shaping and the transmitted reference pulse signal of generation after it receives through the frequency modulation intercommunication radio station and the on-the-spot machine loopback of day alignment of termination machine simultaneously; On-the-spot machine stops the counting of its corresponding mistiming counter respectively behind the synchronous base pulse of the antenna of on-the-spot machine and the reception termination machine loopback of frequency modulation intercommunication radio station and transmitted reference pulse signal; On 1 M in land cable path; Another antenna and on-the-spot machine through on-the-spot machine are measured the counting that receiving circuit receives its mistiming counter of electromagnetic wave measurement signal terminating of tested cable metal pipeline radiation; And read various time difference measurements values and signal waveform sampled value automatically; Carry out signal analysis, various error compensation and measure calculating and data preservation, export the data of burying between direction any one M actual cable laying length L of a certain termination K of tested cable to tested cable through display;
(4) adopt step (1)～(3) method record on-the-spot machine along tested cable bury that direction moves to another N K apart from the termination arbitrarily underground bury cable physical length L ' underground, ask difference promptly to obtain the length of burying cable underground between any 2 M, N on the direction of burying underground of tested cable the cable length of burying underground that records two points.
2. a underground cable any section laying length measures device; It is characterized in that; Adopt the described method of claim 1; Comprise the termination machine that is connected with the heart yearn of a certain termination K of tested cable, along the on-the-spot machine that direction moves to ground, any 1 M top of burying underground of tested cable, on-the-spot machine comprises that crystal oscillator produces high-frequency signal and send control survey circuit CPU, producing the required high-frequency impulse of sample count, produce the low-frequency cycle through the shaping frequency division through shaping is the time synchronized basic pulse of Tr; Send the first frequency modulation intercommunication radio station through the first signal classification processing circuit, launch by first antenna;
The termination machine comprises that the third antenna and the second frequency modulation intercommunication radio station receive the synchronous base pulse of on-the-spot machine emission; Send control circuit through secondary signal classification processing circuit; The transmitted reference pulse that control circuit is produced by the synchronous base trigger action that receives; Power controlling source circuit and measurement radiating circuit are through tested cable socket K launching electromagnetic wave measuring-signal, simultaneously through the synchronous base pulse of secondary signal classification processing circuit, the second frequency modulation intercommunication radio station and third antenna shaping after its reception of on-the-spot machine loopback and the transmitted reference pulse of triggering for generating;
On-the-spot machine receives the synchronous base pulse and the transmitted reference pulse of termination machine loopback through first antenna and the first frequency modulation intercommunication radio station; Send control survey circuit CPU through the first signal classification processing circuit again; On-the-spot machine is through second antenna and measure the electromagnetic wave measurement signal that receiving circuit receives tested cable radiation; Send control survey circuit CPU; CPU carries out each time difference measurements, sampled signal analysis and error compensation, and final liquor charging display is exported tested cable socket K to the physical length L data of laying between on-the-spot machine M point of living in.
3. underground cable any section laying length as claimed in claim 2 measure device; It is characterized in that; Said on-the-spot machine comprises memory and communication port; Through operation keyboard control, memory is used to preserve signal waveform and the computational data that records, and communication port is used for signal waveform that is kept at memory and computational data are printed or called.
4. underground cable any section laying length as claimed in claim 2 measure device; It is characterized in that; Said first, second signal classification processing circuit is that time domain is separated and combiner circuit, and " conversation " wherein switched the conversation or the measurement synchronization pulse signal of frequency modulation communication transmission with " measurement " two kinds of duties by the control of alternative bidirectional analog switch.
5. underground cable any section laying length as claimed in claim 2 measure device; It is characterized in that; Said first, second signal classification processing circuit is that frequency domain separates and combiner circuit, and the conversation of frequency modulation communication transmission separates with the summing amplifier frequency domain with synthetic through high and low pass filter with the measurement synchronization pulse signal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111435077A (en) * | 2019-01-11 | 2020-07-21 | 华为技术有限公司 | Method and device for measuring length of conductor cable |
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