CN204044280U - A kind of cable detection system - Google Patents
A kind of cable detection system Download PDFInfo
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- CN204044280U CN204044280U CN201420478516.2U CN201420478516U CN204044280U CN 204044280 U CN204044280 U CN 204044280U CN 201420478516 U CN201420478516 U CN 201420478516U CN 204044280 U CN204044280 U CN 204044280U
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Abstract
The utility model provides a kind of cable detection system, comprising: central processing unit, radiating circuit module, reflected signal capture circuit module and buffer circuit module; Wherein, radiating circuit module, is connected with central processing unit, for receiving the steering order of central processing unit, producing and launch the pulse signal of different amplitude and duration, in order to carry out cable detection to cable; Reflected signal capture circuit module, is connected with central processing unit, for the identification of cable fault end reflected signal with catch, and reflected signal is sent to central processing unit; Buffer circuit module, respectively with described radiating circuit module and described reflected signal capture circuit model calling, transmits and described reflected signal described in isolating.
Description
Technical field
The utility model relates to cable testing technology field, a kind of fault detect of cable specifically and the system of location
Background technology
Cable is a kind of important telecommunication media, is widely used in the key areas such as instrument and meter, electric power, communication, and therefore the line characteristic situation of cable has important impact for the production of people and life.The common fault of cable line has that mechanical damage, insulation harm, humidified insulation, insulation ag(e)ing are rotten, superpotential, cable overheating fault etc.When line failure, answer the power supply of disengagement failure cable, trouble-shooting point, checks fault and analyzes, then place under repair and test, and pending fault can restore electricity after eliminating.
For the quality being exposed to outdoor cable, the factor impacts such as the impact of easy climate environment, external force, the plague of rats and burn into are aging; And the quality of cable for indoor, then can be subject to that such as external force drags, extruding and the human factor impact such as aging.Above-mentioned two situations all can cause cable line to occur the faults such as broken string, swinging cross and ground connection, when cable line breaks down, normally cannot connect and communicate between the equipment that cable can be made to connect and system, not only can affect people's normal life, even cause production to suffer heavy economic losses.
In view of the foregoing, how getting rid of cable fault by the shortest time, minimum cost is the current important topic faced.Wherein, how to realize miniaturization and the portability of surveying instrument, and the main points that effective, accurate and high-precision measurement becomes technical research are realized to various cable.
Utility model content
For above deficiency, the utility model provides a kind of cable detection system, in order to solve the lower and not portative problem of current cable detecting device accuracy of detection.
The technical solution of the utility model is: provide a kind of cable detection system, and this detection system comprises:
Central processing unit, radiating circuit module, reflected signal capture circuit module and buffer circuit module; Wherein,
Radiating circuit module, is connected with central processing unit, for receiving the steering order of central processing unit, producing and launch the pulse signal of different amplitude and duration, in order to carry out cable detection to cable;
Reflected signal capture circuit module, is connected with central processing unit, for the identification of cable fault end reflected signal with catch, and reflected signal is sent to central processing unit;
Buffer circuit module, respectively with radiating circuit module and reflected signal capture circuit model calling, transmits and reflected signal for isolation.
In one embodiment, buffer circuit module is high-speed analog switch.
In one embodiment, this detection system also comprises: human-computer interaction module, is connected with central processing unit, for the setting to exomonental amplitude, duration parameters and cable velocity of wave.
In one embodiment, this detection system also comprises: power module, with all model calling, for providing the energy for detection system.
By the cable detection system that the utility model provides, achieve the short circuit of multiple cable and the detection of open circuit fault and the trouble spot Distance positioning apart from test point, measuring accuracy is high, measurement blind area is little, the little good portability of volume, continuous measuring hours are long, simply easy to operate.
Accompanying drawing explanation
Fig. 1 is the overall construction drawing of the utility model cable detection system;
Fig. 2 is the detailed structure view of the utility model cable detection system;
Fig. 3 A is the circuit diagram of the high-speed analog switch in the utility model cable detection system;
Fig. 3 B is the high-speed analog switch control signal sequential chart in the utility model cable detection system;
Fig. 4 is the overhaul flow chart of the utility model cable detection system;
Fig. 5 is the operational flowchart of the utility model cable detection system.
Embodiment
For making the object of the utility model embodiment, technical scheme and advantage clearly understand, below in conjunction with accompanying drawing, the utility model embodiment is described in further details.For this reason, embodiment of the present utility model and illustrating for explaining the utility model, but not as to restriction of the present utility model.
The utility model utilizes low voltage pulse reflection method detection streamer fault, its cardinal principle is as follows: send a potential pulse to cable, when transponder pulse runs into fault (short circuit or open circuit) on the transmission line, due to trouble spot impedance mismatch, produce reverse impulse, by the mistiming T both calculating, and the characteristic analyzing reflected impulse is to carry out the qualitative of fault and location.The method is applicable to the test of broken string or short trouble.Trouble spot distance L is L=V*T/2, and wherein, V is pulse velocity of propagation in the cable.Initial phase failure judgement character according to pulse: 0 degree represents open circuit, 180 degree represent short circuit.
As shown in Figure 1, Fig. 1 is the overall construction drawing of the utility model cable detection system, and this cable detection system comprises:
Central processing unit 101, radiating circuit module 102, reflected signal capture circuit module 103 and buffer circuit module 104; Wherein,
Radiating circuit module 102, is connected with central processing unit 101, for receiving the steering order of central processing unit 101, producing and launch the pulse signal of different amplitude and duration, in order to carry out cable detection to cable;
Reflected signal capture circuit module 103, is connected with central processing unit 101, for the identification of cable fault end reflected signal with catch, and reflected signal is sent to central processing unit 101;
Buffer circuit module 104, is connected with radiating circuit module 102 and reflected signal capture circuit module 103 respectively, transmits and reflected signal for isolation.
In one embodiment, buffer circuit module 103 is high-speed analog switchs.
In one embodiment, this detection system also comprises: human-computer interaction module 105, is connected with central processing unit 101, is made up of keyboard and LCD, wherein keyboard is for setting exomonental amplitude, duration parameters and the numerical value to cable velocity of wave, and LCD is for showing parameter and the numerical value of every setting.
In one embodiment, this detection system also comprises: power module (not indicating in figure), be used for providing the energy for whole cable detection system with all model calling, specifically, the Large Copacity rechargeable battery that this power supply is exported by 12V and electric power management circuit form, and fully ensure the power supply supply of the satisfied different demand of cable detection system.
By the cable detection system that the utility model provides, utilize the time domain reflectometry that pulse is transmitted in long conductor, the position that is harmless, positioning cable middle impedance point of discontinuity fast and accurately of cable can be realized, simultaneously for operating personnel provides the operation interface of good safety.
Fig. 2 is the detailed structure view of the utility model cable detection system.
As shown in Figure 2, processor 201 in the utility model adopts to has on sheet programmable system (hereinafter referred to as SOPC, System-on-a-Programmable-Chip) field programmable logic device (FPGA of ability, Field Programming Gate Array), control external circuit and realize data processing, level of integrated system is high, low in energy consumption.Wherein, the Nios II processor in SOPC system is a kind of reduced instruction set computer general purpose microprocessor based on streamline, and clock frequency can reach 133MHz.The clock frequency of reflected signal processing module is 200MHz, by the ALTERNATE SAMPLING of 4 90 degree of phase shifted clocks, it can be made to process frequency and be equivalent to 800MHz, and thus its data processing speed is fast, and temporal resolution is high.The control of the external circuit of central processing unit is designed by HDL hardware description language entirely and programmable logic array realization, reliable and stable.
Radiating circuit module 202 can produce the short pulse signal of 20nS-2uS duration and 5V or 12V to the instruction that the control module 206 that transmits sends according to SOPC system.
Reflected signal capture circuit module 203 is made up of operational amplifier and shaping circuit, reflected signal is carried out amplifying and shaping, obtains the discernible rectangular pulse signal of FPGA (Field Programmable Gate Array) permutation and by reflected signal processing module 207, pulse signal be input in SOPC system.
Buffer circuit module 204, is realized by high-speed analog switch, sends steering order by isolated controlling module 205 pairs of high-speed analog switchs, transmits and the isolation of reflected signal and switching for completing.
Detection system of the present utility model also comprises: keyboard 208, liquid crystal display 209 (LCD) and storer 210, wherein, keyboard 208 is for setting exomonental amplitude and duration parameters and the numerical value to cable velocity of wave, liquid crystal display 209 (LCD) is for showing parameter and the numerical value of every setting, and storer 210 is for storing various steering order in SOPC system and data.
As shown in Figure 3A, Fig. 3 A is the circuit diagram of high-speed analog switch, wherein, IN1 for connect FPGA control signal transmitting terminal (being emitted as 12V), IN2 be connect FPGA control transmit catch end, D2 is the end being connected to cable, S2 is for connecting reflected signal capture circuit end, Ctr_12 and Ctr_f is S1, D1 and S2, D2 double switch respectively, when control signal is low level, analog switch closed i.e. S1=D1, S2=D2.Incorporated by reference to the high-speed analog switch control signal sequential chart that Fig. 3 B, Fig. 3 B is in the utility model cable detection system, wherein central processing unit (F PGA) is as follows to the principle of control signal Ctr_12 and Ctr_f:
(1) when Ctr_12 is low level, S1=D1=D2, namely launching amplitude is 12V, and duration and the isometric pulse signal of Ctr_n low level are in cable, and at this moment Ctr_p is high level, S2 and D2 is open circuit, and no signal is sent to reflection capture circuit;
(2) when Ctr_f is low level, S2=D2=D1, namely cable is held with S2 and is connected, the reflected signal of pulse signal at cable fault place of previous transmission enters in capture circuit by S2 end, at this moment Ctr_n is high level, S1 and D1 is open circuit, is not connected with transmitting, realizes launching the isolation with reflected signal
The control principle of to be more than the amplitude of transmitting be 12V, transmit as the control principle of Ctr_5 (transmitting amplitude is 5V) is consistent, just Ctr_12 and Ctr_5 can only have a signal effective, and another signal is high level entirely.
Fig. 4 is the overhaul flow chart of the utility model cable detection system.Incorporated by reference to Fig. 1, concrete steps are as follows:
Step 4-1: by human-computer interaction module 104 pairs of central processing unit 101 setting measurement parameters.
Specifically, setting pulse time length scope is: the short-time pulse of 20nS-2uS, and pulse height is 5V (volt) or 12V;
Step 4-2: the circuit module 102 that transmits produces according to measurement parameter and launches the pulse signal setting amplitude and duration and carries out cable detection;
Step 4-3: pulse signal is launched into tested cable through buffer circuit module 104;
Step 4-4: the pulse signal of transmitting reflects to form reflected signal through trouble spot, reflected signal enters reflected signal trapping module 103 through buffer circuit module 104, obtains time of arrival and the initial phase of reflected signal;
Step 4-5: central processing unit 101 is poor with the time of arrival of the initial time and reflected impulse of launching short-time pulse according to the initial phase of reflected signal, gets final product the distance of failure judgement type and trouble spot distance test lead.
Compared with existing electric cable failure detector, advantage of the present utility model is:
1, because setting parameter is flexible, therefore cable type can be measured more.
2, phase place and time measurement realize by FPGA, and launch the initial time of short-time pulse and difference T time of arrival of reflected impulse, and provide measurement clock by 800MHz clock, measuring accuracy is high, is 3*10 in cable transmission speed
8under meter per second condition, measuring accuracy is less than 37.5 centimetres, and measure blind area and be less than 1.5 meters, therefore accuracy of measurement is higher.
3, whole cable tester integrated level is high, volume is little, flexible to operation, whole system, can continuous working more than 4 hours by lithium battery power supply, and travelling performance is good.
Fig. 5 is the operational flowchart of the utility model cable detection system, achieves the detection of cable fault type and the determination of position of failure point by following operation steps.
Step 501: firing cable detects detection system, enters initialization interface, test cable is connected to test port after completing initialization;
Step 502: button is selected " setting parameter ", " cable detection " in initialization interface;
Step 503: enter " setting parameter " interface, by keyboard to set up " cable transmission speed ", " pulse duration " and selection " pulse height ", the unit of " cable transmission speed " is 10
4m/s (metre per second (m/s)), the unit of " pulse duration " is ns (nanosecond), and " pulse height " only has 5V (volt) and 12V two kinds selection, treats that setting parameter completes, cable detection system will be preserved automatically, and turn back to initialization interface;
Step 504A: directly enter " cable detection " interface by initialization interface, cable detection system controls the work of back end reflective signal circuit, buffer circuit and reflection capture circuit according to initiation parameter, and initiation parameter is: " cable transmission speed " is 19800*10
4m/s (metre per second (m/s)), " pulse duration " 200ns (nanosecond), " pulse height " has 5V;
Step 504B: by entering " cable detection " interface after " setting parameter ", cable detection system controls the work of back end reflective signal circuit, buffer circuit and reflection capture circuit according to the parameter of setting;
Step 505: cable detection system is automatically according to the detection of setup parameter and the complete paired cable of pulse-reflection principle, and by the fault type of cable: short circuit or open circuit, trouble spot is apart from the distance of test point: X rice, and display on the lcd screen;
Step 506: the cable connecting the identical type of next root, turns back to " cable detection " interface, measures next time;
Step 507: connect the cable that next root is dissimilar, turns back to " setting parameter " interface, after setup parameter, then performs by step 504B;
Step 508: complete measurement, powered-down.
By the cable detection system that the utility model provides, achieve the short circuit of multiple cable and the detection of open circuit fault and the trouble spot Distance positioning apart from test point, measuring accuracy is high, measurement blind area is little, the little good portability of volume, continuous measuring hours are long, simply easy to operate.
Be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Claims (4)
1. a cable detection system, is characterized in that, described cable detection system comprises:
Central processing unit, radiating circuit module, reflected signal capture circuit module and buffer circuit module; Wherein,
Radiating circuit module, is connected with described central processing unit, for receiving the steering order of described central processing unit, producing and launch the pulse signal of different amplitude and duration, to carry out Cable fault examination to cable;
Reflected signal capture circuit module, is connected with described central processing unit, for the identification of cable fault end reflected signal with catch, and reflected signal is sent to central processing unit;
Buffer circuit module, respectively with described radiating circuit module and described reflected signal capture circuit model calling, transmits and described reflected signal described in isolating.
2. cable detection system as claimed in claim 1, it is characterized in that, described buffer circuit module is high-speed analog switch.
3. cable detection system as claimed in claim 1, is characterized in that, also comprise:
Human-computer interaction module, is connected with described central processing unit, for the setting to exomonental amplitude, duration parameters and cable velocity of wave.
4. cable detection system as claimed in claim 1, is characterized in that, also comprise:
Power module, with all model calling, for providing the energy for described detection system.
Priority Applications (1)
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| CN201420478516.2U CN204044280U (en) | 2014-08-22 | 2014-08-22 | A kind of cable detection system |
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| CN201420478516.2U CN204044280U (en) | 2014-08-22 | 2014-08-22 | A kind of cable detection system |
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| CN204044280U true CN204044280U (en) | 2014-12-24 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104502785A (en) * | 2015-01-05 | 2015-04-08 | 苏州路之遥科技股份有限公司 | Multi-position single-model wire harness testing method for wire harness intelligent test machine |
| CN104569723A (en) * | 2015-01-05 | 2015-04-29 | 苏州路之遥科技股份有限公司 | Multi-station multi-type hybrid wire harness testing method for intelligent wire harness tester |
| CN104732688A (en) * | 2015-03-11 | 2015-06-24 | 国家电网公司 | Power cable tending and monitoring anti-theft alarming system and monitoring alarming method |
| CN105589014A (en) * | 2016-02-20 | 2016-05-18 | 广州启光智造技术服务股份有限公司 | Cable breakpoint lossless on-line detection system and cable breakpoint lossless on-line detection method |
| CN105866632A (en) * | 2016-05-25 | 2016-08-17 | 国网天津武清供电有限公司 | Cable fault location device for distribution network lines |
| CN105891641A (en) * | 2016-05-04 | 2016-08-24 | 国网上海市电力公司 | Cable recognition device and recognition method |
| CN106370984A (en) * | 2016-11-09 | 2017-02-01 | 中车长春轨道客车股份有限公司 | Electric line conduction automatic checkout system and method |
| TWI598600B (en) * | 2016-07-29 | 2017-09-11 | 智原科技股份有限公司 | Method for performing cable diagnostics in a network system, and associated apparatus |
| CN107991577A (en) * | 2017-11-27 | 2018-05-04 | 国网辽宁省电力有限公司葫芦岛供电公司 | Power cable tracks fault analysis instrument |
| WO2019033616A1 (en) * | 2017-08-17 | 2019-02-21 | 深圳市景程信息科技有限公司 | Time domain reflective single end test apparatus and method for radio frequency co-axial coupler |
| CN109387751A (en) * | 2017-08-02 | 2019-02-26 | 南京南瑞继保电气有限公司 | A kind of line fault monitoring device |
| CN114113910A (en) * | 2021-12-06 | 2022-03-01 | 中煤科工集团沈阳研究院有限公司 | Mining cable fault finding method and device |
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2014
- 2014-08-22 CN CN201420478516.2U patent/CN204044280U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104569723A (en) * | 2015-01-05 | 2015-04-29 | 苏州路之遥科技股份有限公司 | Multi-station multi-type hybrid wire harness testing method for intelligent wire harness tester |
| CN104502785A (en) * | 2015-01-05 | 2015-04-08 | 苏州路之遥科技股份有限公司 | Multi-position single-model wire harness testing method for wire harness intelligent test machine |
| CN104732688A (en) * | 2015-03-11 | 2015-06-24 | 国家电网公司 | Power cable tending and monitoring anti-theft alarming system and monitoring alarming method |
| CN105589014A (en) * | 2016-02-20 | 2016-05-18 | 广州启光智造技术服务股份有限公司 | Cable breakpoint lossless on-line detection system and cable breakpoint lossless on-line detection method |
| CN105891641A (en) * | 2016-05-04 | 2016-08-24 | 国网上海市电力公司 | Cable recognition device and recognition method |
| CN105866632A (en) * | 2016-05-25 | 2016-08-17 | 国网天津武清供电有限公司 | Cable fault location device for distribution network lines |
| TWI598600B (en) * | 2016-07-29 | 2017-09-11 | 智原科技股份有限公司 | Method for performing cable diagnostics in a network system, and associated apparatus |
| CN106370984A (en) * | 2016-11-09 | 2017-02-01 | 中车长春轨道客车股份有限公司 | Electric line conduction automatic checkout system and method |
| CN106370984B (en) * | 2016-11-09 | 2018-12-14 | 中车长春轨道客车股份有限公司 | Detection method based on electric wiring conducting automatic checkout system |
| CN109387751A (en) * | 2017-08-02 | 2019-02-26 | 南京南瑞继保电气有限公司 | A kind of line fault monitoring device |
| WO2019033616A1 (en) * | 2017-08-17 | 2019-02-21 | 深圳市景程信息科技有限公司 | Time domain reflective single end test apparatus and method for radio frequency co-axial coupler |
| CN107991577A (en) * | 2017-11-27 | 2018-05-04 | 国网辽宁省电力有限公司葫芦岛供电公司 | Power cable tracks fault analysis instrument |
| CN114113910A (en) * | 2021-12-06 | 2022-03-01 | 中煤科工集团沈阳研究院有限公司 | Mining cable fault finding method and device |
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