CN102809716A - Emulational cable fault location method by adopting pulse method - Google Patents
Emulational cable fault location method by adopting pulse method Download PDFInfo
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Abstract
The invention provides an emulational cable fault location method by adopting a pulse method. The method comprises the following steps: building a three-dimensional cable model and establishing a transmission model of a pulse signal transmitted in a cable according to the characteristic parameters of the to-be-tested cable; virtualizing a three-dimensional casing of a cable fault location instrument and arranging three-dimensional buttons and a three-dimensional display screen on the three-dimensional casing; responding to commands input by a user through the three-dimensional buttons and generating an incidence pulse signal according to pre-stored pulse width parameters; calculating the time difference value between the incidence pulse signal and a reflected pulse according to the transmission model and displaying the waveforms of both the incidence pulse and the reflected pulse on the three-dimensional display screen; and calculating the position of a fault point according to the time difference value and displaying the fault point at a corresponding position on the three-dimensional cable model. Owing to the technology provided by the invention, visualized cable fault location emulation is realized, important visual references are provided for cable fault removal, the power supply security is ensured, the security work efficiency is improved and the method has an extremely high popularization value.
Description
Technical field
The present invention relates to the electric system simulation technology, particularly relate to a kind of impulse method cable fault survey and seek emulation mode.
Background technology
Cable is the key equipment that the large size city electrical network transmits electric power.The cable defective defective that insulate in service can cause cable normally not transmit electric power and cause the possibility of large-area power-cuts.Cable fault is surveyed and sought is the important means that the research of electric system cable correlation technique, operational defect detected, implemented repair based on condition of component.
Cable fault is surveyed and have been sought several different methods, and wherein the full-automatic cable fault of impulse method surveys that to seek be wherein a kind of, and impulse method is the distance-finding method to failure cable emission action of low-voltage pulse, is suitable for the survey of cable break and low-resistance fault and seeks.At present, technology is sought in survey for the impulse method cable fault, generally is to seek technology through the survey based on physical equipment; Owing to use physical equipment; Need take a large amount of site facilities, and need the outfit physical equipment to cause cost high, it is low to need to survey target-seeking efficient to the cable scene.
Summary of the invention
Based on this, be necessary to seek technical costs height, inefficient problem to traditional impulse method cable fault survey, provide a kind of impulse method cable fault to survey and seek emulation mode.
A kind of impulse method cable fault is surveyed and is sought emulation mode, comprises the steps:
Utilize virtual reality technology to set up the cable three-dimensional model, and set up the mode that pulse signal transmits in cable according to the characterisitic parameter of tested cable;
Utilize virtual reality technology to fictionalize cable fault and survey the three-dimensional case of seeking instrument, and on this three-dimensional case, set three-dimensional button and three-dimensional display screen;
The response user generates the incident pulse signal through the instruction of said three-dimensional button input according to the pulsewidth parameter that prestores;
Calculate the time difference between said incident pulse signal and the corresponding reflected impulse according to said mode, and the waveform of said incident pulse and reflected impulse is shown on said three-dimensional display screen;
Position according to said time difference calculates Method of Cable Trouble Point shows said trouble spot correspondence position on the cable three-dimensional model.
Above-mentioned impulse method cable fault is surveyed and is sought emulation mode, and emulation impulse method cable fault is surveyed target-seeking process, combines with virtual reality technology; Through setting up visual cable model and instrument models, in the l-G simulation test process, can realize visual displaying, realized that visual cable fault is surveyed to seek emulation; For the cable fault eliminating provides important reference directly perceived; Guarantee the security of power supply, improved the efficient of safeguard work, had high promotional value.
Description of drawings
Fig. 1 is that the emulation mode process flow diagram is sought in the impulse method cable fault survey of an embodiment;
Fig. 2 is the equivalent circuit diagram of cable.
Embodiment
Below in conjunction with accompanying drawing impulse method cable fault of the present invention being surveyed the embodiment of seeking emulation mode describes in detail.
Fig. 1 shows the impulse method cable fault survey of an embodiment and seeks the emulation mode process flow diagram, mainly comprises the steps:
Step S100, utilize virtual reality technology to set up the cable three-dimensional model, and set up the mode that pulse signal transmits in cable according to the characterisitic parameter of tested cable;
Step S200, utilize virtual reality technology to fictionalize cable fault to survey the three-dimensional case seek instrument, and on this three-dimensional case, set three-dimensional button and three-dimensional display screen;
The instruction that step S300, response user import through said three-dimensional button generates the incident pulse signal according to the pulsewidth parameter that prestores;
Step S400, calculate the time difference between said incident pulse signal and the corresponding reflected impulse, and the waveform of said incident pulse and reflected impulse is shown on said three-dimensional display screen according to said mode;
Step S500, according to the position that said time difference calculates Method of Cable Trouble Point, said trouble spot correspondence position on the cable three-dimensional model is shown.
For clear more technology of the present invention, set forth preferred embodiment below.
In step S100, utilize virtual reality technology to set up the process of cable three-dimensional model:
Particularly, be prototype with tested cable, according to the ratio and the color of each parts; Utilize the 3DMAX software virtual to go out the cable three-dimensional model; Wherein, said cable three-dimensional model is made up of three-phase, comprises both sides three-phase electricity cable end, terminals, oversheath, armor, ground wire, bracket component.
In step S100, set up the process of the mode that pulse signal transmits according to the characterisitic parameter of tested cable in cable:
At first, the performance data of cable in operational process analyzed, obtained equivalent electrical circuit by resistance, electricity are led, inductance and electric capacity are formed;
Particularly, cable is monitored at operational process, read the typical data of its real time execution, typical data is analyzed, set up about cable by resistance, electricity are led, inductance and electric capacity are formed equivalent electrical circuit;
Because pulse row ripple is in the cable transmission process, receive the electric field effects of cable own, the equivalent electrical circuit that cable resolves into that resistance, electricity are led, inductance and electric capacity are formed is as shown in Figure 2, R among the figure
0Be the resistance of unit length, L
0Be the inductance of unit length, G
0Be the susceptance of unit length, R
0, G
0Existence can cause waveform generation decay, work as R
0=0, G
0=0 o'clock, cable can be realized the height emulation to cable properties for harmless cable through equivalent electrical circuit, improved emulation and surveyed target-seeking accuracy.
Then, obtain the computing formula and the waveform attenuating coefficient of the velocity of wave that pulse signal transmits in cable according to said equivalent electrical circuit;
For example, for harmless cable, its velocity of wave
For the S.C. overhead transmission line, its
Wherein, μ
0Be magnetic capacity, ε
0Be specific inductive capacity.
In step S200; Utilizing virtual reality technology to fictionalize the cable fault survey and seek the three-dimensional case of instrument, and the process of three-dimensional button and three-dimensional display screen is set on this three-dimensional case, mainly is three-dimensional case, the three-dimensional part of making instrument; And the function of set parts, specifically comprise:
At first, surveying the external structure of seeking instrument with cable fault is prototype, utilizes the 3DMAX software virtual to go out the three-dimensional case of instrument;
Particularly; The proportionate relationship that adopts the 3DMAX business software to survey the length of seeking instrument according to FH-8630 type cable fault is set up the detecting instrument three-dimensional case; According to the length and width ratio of shell and the position on instrument, obedient dark base map on the three-dimensional case of instrument.
Then, on said three-dimensional case, fictionalize three-dimensional button, three-dimensional display screen figure; Wherein, three-dimensional button comprises power switch, test button, numerical key etc., in addition, in order to reach virtual effect more true to nature, can also make other like connector, measures male components such as wiring, measurement ground connection.
The 3rd, set up a plane coordinate system, the zone of in this coordinate system, setting said three-dimensional button figure is the reach of mouse event, setting said three-dimensional display screen is the waveform indication range;
Particularly, be initial point with the lower left corner of instrument front rectangle, set up plane coordinate system, in this coordinate system, be defined as each three-dimensional button, rectangle of three-dimensional display screen definition goes to be used to respond mouse event as reach; With this rectangular extent of click is the triggering command of setting incident, three-dimensional display screen can its zone in the display waveform figure;
Through the corresponding relation between the operational order of setting up said three-dimensional button and input; Replace options button and data input frame etc. with three-dimensional button; Make instruction, the data input of instrument emulation all through being that the three-dimensional button of prototype is imported with the actual key; Simultaneously, the output data of instrument simulation mathematical model is shown in the determined coordinate range of three-dimensional display screen boundary rectangle, by the way; Realized visual presentation, solved visual low defectives such as traditional selection key, input frame the instrumentation height.
Further, consider traveling wave method is received cable attenuation in the cable fault position fixing process influence, the pulse signal that different widths can also be set carries out the fault survey and seeks; Improve fault and survey target-seeking accuracy; Particularly, on said three-dimensional case, set the three-dimensional regulation knob, the response user is through the instruction of transferring the files of said three-dimensional regulation knob input; From the said parameter that prestores, select corresponding pulsewidth parameter, generate the incident pulse signal;
As an embodiment, the relation of strobe pulse width parameter and tested cable length is following:
When tested cable is 1000 ~ 9999 meters, can select the pulsewidth parameter of 0.2 microsecond pulse;
When tested cable is 10000 ~ 19999 meters, can select the pulsewidth parameter of 2 microsecond pulses;
When tested cable is more than 20000 meters the time, can select the pulsewidth parameter of 4 microsecond pulses.
Instruction for step S300, response user import through said three-dimensional button generates the incident pulse signal according to the pulsewidth parameter that prestores;
Particularly, mainly be in carrying out the l-G simulation test process, utilize the instrument three-dimensional model to carry out steering order, data input and output data and show (comprising various measured values, waveform etc.), thereby the height of realizing l-G simulation test is visual;
As an embodiment, at first cable three-dimensional model and instrument three-dimensional model are imported to based in the virtual reality technology virtual scene; Wherein, this virtual scene is that the scene that belongs to cable is a prototype, the three-dimensional scene models that adopts the 3DMAX business software to carry out emulation.In this three-dimensional scene models, using the instrument three-dimensional model to carry out the cable fault survey then seeks; When needs display waveform figure, the waveform graph of incident pulse and reflected impulse is followed in the indication range of three-dimensional display screen and shows, the waveform of incident pulse through the waveform attenuating coefficient after, obtain the reflected impulse waveform.
By the way, with respect to form, have more effect of visualization true to nature through selection key; Waveform display mode with respect to fixing has more effect of visualization true to nature.
In step S500, calculate the process of the position of Method of Cable Trouble Point according to said time difference, according to each parameter amount, utilize following formula to calculate fault distance, confirm abort situation:
In the formula, L is the distance of trouble spot, and Δ t is a time difference, and v is the transmission speed of pulse in cable.
In step S500, trouble spot correspondence position on the cable three-dimensional model is shown; Particularly, because the cable three-dimensional model is scaled,, on this position, carries out high bright demonstration then, thereby can realize the real-time visual effect of trouble spot so, on the cable three-dimensional model, calculate the relevant position then according to the position of physical fault point.
Technical scheme of the present invention is the virtual reality technology of characteristic with the feeling of immersion of height and good interactivity, obtains manual simulation's environment true to nature, effectively the behavior of anthropomorphic dummy's various sensory perceptual systems in experimental situation; Realize that highly visual cable fault is surveyed and seek emulation; Improved the work efficiency that fault is got rid of, technology of the present invention is used widely in network system, and has obtained goodish effect; In emulation safety training education; The operating condition and the malfunction of cable are monitored the aspect, can bring fabulous effect, have positive meaning.
The above embodiment has only expressed several kinds of embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with accompanying claims.
Claims (8)
1. an impulse method cable fault is surveyed and is sought emulation mode, it is characterized in that, may further comprise the steps:
Utilize virtual reality technology to set up the cable three-dimensional model, and set up the mode that pulse signal transmits in cable according to the characterisitic parameter of tested cable;
Utilize virtual reality technology to fictionalize cable fault and survey the three-dimensional case of seeking instrument, and on this three-dimensional case, set three-dimensional button and three-dimensional display screen;
The response user generates the incident pulse signal through the instruction of said three-dimensional button input according to the pulsewidth parameter that prestores;
Calculate the time difference between said incident pulse signal and the corresponding reflected impulse according to said mode, and the waveform of said incident pulse and reflected impulse is shown on said three-dimensional display screen;
Position according to said time difference calculates Method of Cable Trouble Point shows said trouble spot correspondence position on the cable three-dimensional model.
2. impulse method cable fault according to claim 1 is surveyed and is sought emulation mode, it is characterized in that, saidly utilizes virtual reality technology to set up cable three-dimensional model step to comprise:
With tested cable is prototype; According to the ratio and the color of each parts, utilize the 3DMAX software virtual to go out the cable three-dimensional model, wherein; Said cable three-dimensional model is made up of three-phase, comprises both sides three-phase electricity cable end, terminals, oversheath, armor, ground wire, bracket component.
3. impulse method cable fault according to claim 1 is surveyed and is sought emulation mode, it is characterized in that, said characterisitic parameter according to tested cable is set up the mode step that pulse signal transmits and comprised in cable:
Pulse signals transient state travelling wave process in cable is analyzed, and obtains the equivalent electrical circuit by resistance, electricity are led, inductance and electric capacity are formed;
Obtain the computing formula and the waveform attenuating coefficient of the velocity of wave that pulse signal transmits in cable according to said equivalent electrical circuit.
4. impulse method cable fault according to claim 1 is surveyed and is sought emulation mode; It is characterized in that; Saidly utilize virtual reality technology to fictionalize cable fault to survey and to seek the three-dimensional case of instrument, and on this three-dimensional case, three-dimensional button be set and the three-dimensional display screen step specifically comprises:
Surveying the external structure of seeking instrument with cable fault is prototype, utilizes the 3DMAX software virtual to go out the three-dimensional case of instrument;
On said three-dimensional case, fictionalize three-dimensional button, three-dimensional display screen figure;
Set up a plane coordinate system, the zone of in this coordinate system, setting said three-dimensional button figure is the reach of mouse event, and setting said three-dimensional display screen is the waveform indication range.
5. impulse method cable fault according to claim 1 is surveyed and is sought emulation mode, it is characterized in that, also comprises:
On said three-dimensional case, set the three-dimensional regulation knob, the response user selects corresponding pulsewidth parameter through the instruction of transferring the files of said three-dimensional regulation knob input from the said parameter that prestores, generate the incident pulse signal.
6. impulse method cable fault according to claim 1 is surveyed and is sought emulation mode, it is characterized in that, said response user generates the incident pulse signals step according to the pulsewidth parameter that prestores and comprises through the instruction of said three-dimensional button input:
Cable three-dimensional model and instrument three-dimensional model are imported to based in the virtual reality technology virtual scene; Wherein, this virtual scene is that the scene that belongs to cable is a prototype, the three-dimensional scene models that adopts the 3DMAX business software to carry out emulation;
In this three-dimensional scene models, using the instrument three-dimensional model that the cable three-dimensional model is carried out the emulation survey then seeks.
7. impulse method cable fault according to claim 1 is surveyed and is sought emulation mode, it is characterized in that, said position step according to said time difference calculating Method of Cable Trouble Point comprises:
In the formula, L is the distance of trouble spot, and Δ t is a time difference, and v is the transmission speed of pulse in cable.
8. impulse method cable fault according to claim 1 is surveyed and is sought emulation mode, it is characterized in that, also comprises: according to the position of said trouble spot cable is carried out fault and get rid of.
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| CN103954886A (en) * | 2014-04-24 | 2014-07-30 | 华南理工大学 | Cable fault positioning simulation method using time domain reflectometry |
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| CN109975660A (en) * | 2019-04-11 | 2019-07-05 | 西安福润德电子科技有限公司 | A kind of method of multrirange synthesis gamut panorama test pulse |
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| CN115856525A (en) * | 2022-11-08 | 2023-03-28 | 武汉朗德电气有限公司 | Cable partial discharge online monitoring method and system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103337119A (en) * | 2013-06-08 | 2013-10-02 | 山东康威通信技术股份有限公司 | Burglary-resisting monitoring and positioning method for armored cable |
| CN103337119B (en) * | 2013-06-08 | 2015-11-18 | 山东康威通信技术股份有限公司 | A kind of method of armored electric cable theft prevention monitoring and location |
| CN105940310A (en) * | 2013-11-13 | 2016-09-14 | 飞利浦灯具控股公司 | Problem detection in cable system |
| CN103954886A (en) * | 2014-04-24 | 2014-07-30 | 华南理工大学 | Cable fault positioning simulation method using time domain reflectometry |
| CN109975660A (en) * | 2019-04-11 | 2019-07-05 | 西安福润德电子科技有限公司 | A kind of method of multrirange synthesis gamut panorama test pulse |
| CN110930538A (en) * | 2019-12-18 | 2020-03-27 | 三一重机有限公司 | Method and system for visualizing fault information of vehicle |
| CN112185222A (en) * | 2020-10-19 | 2021-01-05 | 西安三芯易达电子科技有限公司 | Cable fault correlator and terminal |
| CN112185222B (en) * | 2020-10-19 | 2022-06-10 | 西安三芯易达电子科技有限公司 | Cable fault correlator and terminal |
| CN115856525A (en) * | 2022-11-08 | 2023-03-28 | 武汉朗德电气有限公司 | Cable partial discharge online monitoring method and system |
| CN115856525B (en) * | 2022-11-08 | 2024-03-19 | 武汉朗德电气有限公司 | Cable partial discharge on-line monitoring method and system |
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Effective date of registration: 20200917 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. |
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