CN109975660A - A kind of method of multrirange synthesis gamut panorama test pulse - Google Patents
A kind of method of multrirange synthesis gamut panorama test pulse Download PDFInfo
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- CN109975660A CN109975660A CN201910287818.9A CN201910287818A CN109975660A CN 109975660 A CN109975660 A CN 109975660A CN 201910287818 A CN201910287818 A CN 201910287818A CN 109975660 A CN109975660 A CN 109975660A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Engineering & Computer Science (AREA)
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- Locating Faults (AREA)
Abstract
A kind of method of multrirange synthesis gamut panorama test pulse, comprising the following steps: 1) wireline test range is divided into 3-5 range according to full scale；2) number 3-5 kind difference pulse is corresponded to according to 3-5 measurement range selection of step 1): and select in the following way: 4) 3-5 kind test pulse should have reasonable pulsewidth and pulse spacing；4) it is exported by microprocessor driven high-frequency high-voltage sub switch timing on-off, the test pulse of the 3-5 kind distinct pulse widths of 3-5 range is synthesized into the one or many outputs of one group of test pulse and is used as panorama test pulse.This method is applied to cable fault positioning can be in order to avoid range be arranged, and no testing blind zone reduces the field experience requirement and technical foundation requirement to operator, avoids judging by accident, accurate positioning is easy to operate, easy to implement.
Description
Technical field
The present invention relates to a kind of pulse combination methods, and in particular to a kind of multrirange synthesis gamut panorama test pulse
Method.
Background technique
With the fast development of various electrical insulating material technologies and new energy technology, the high pressure of the various energy that transmit electric power
Cable is also developed rapidly, it saves space, beauty, environmental protection, safety.
But urban construction and municipal rebuilding construction and high-tension cable dosage quickly increase in High-speed Urbanization
The increase for then causing cable fault jeopardizes electric power netting safe running, how to improve the location efficiency of cable fault, shortens cable event
Barrier emergency repair time seems further important, and there are more foundation field conditions to cable fault in traditional cable fault detection instrument
The operation that detecting instrument is rationally arranged, the work on the spot experience of more dependence operation maintenance personnel, to cable operation maintenance personnel
Technical foundation and work on the spot skill requirement are higher.
Cable fault locator device, commonly referred to as electric cable failure detector in the industry, in order to guarantee that test is accurate, its test
Range is usually full scale 20km or 30km, 50km, 100km, 200km, and full scale is divided into 2-6 testing range.
Here 20km, 30km or 50km full scale has usually corresponded to the length range of overland cable, and 50km, 100km or 200km are completely measured
Cheng Changchang has corresponded to the length range of submarine cable, and each range has corresponded to corresponding test pulsewidth and different test sample frequencies
Rate, by site operation personnel, manually setting reasonably selects testing range progress cable fault survey according to the actual situation when instrument uses
Examination, is limited to the field experience and technical foundation of operator, the efficiency shadow positioned to cable fault is correctly arranged in testing range
Sound is very big, when especially encountering the near terminal fault of long cable, frequently even causes cable fault positioning failure.
Summary of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the object of the present invention is to provide a kind of multriranges to synthesize gamut panorama
The method of test pulse is positioned for cable fault, is applicable in and is designed cable fault locator device, such instrument using the method
It is easy to operate, it may be implemented to exempt from range setting, show feature without testing blind zone, waveform obviously, clarity of detail, once complete full dose
Cheng Quanjing test has the advantages that significantly reduce to cable fault positioning operation personnel on site experience and technical foundation dependence.
To achieve the goals above, the technical solution adopted by the present invention is that:
A kind of method of multrirange synthesis gamut panorama test pulse, comprising the following steps:
1) wireline test range is divided into 3-5 range according to full scale；
2) number 3-5 kind difference pulse is corresponded to according to 3-5 measurement range selection of step 1): and select in the following way:
Test pulse transmits in the cable decaying, and the pulse energy of burst pulse is small, equivalent frequency is high, therefore decays more
Fastly, transmission range is small；The pulse energy of broad pulse is big, equivalent frequency is low, therefore it is slow to decay, and long transmission distance works as reflected impulse
Emit pulse with it and be not easy to differentiate the start time point of reflected impulse when having overlapping, cause testing blind zone, therefore, small-range should
Relatively narrow test pulse is selected, wide range should select to be tested with wider test pulse；
3) 3-5 kind test pulse should have reasonable pulsewidth and pulse spacing；
According to the range formula of wave transmissions in cable and reflection:
Wherein, L is fault distance m, and v is the wave transmissions speed of test pulse in the cable, and v=172m/us, lt are to survey
Try the time difference (uS) of pulse-echo and transmitted wave；
4) it is exported by microprocessor driven high-frequency high-voltage sub switch timing on-off, by the 3-5 kind difference arteries and veins of 3-5 range
Wide test pulse synthesizes the one or many outputs of one group of test pulse and is used as panorama test pulse.
The beneficial effects of the present invention are:
Implementation of the invention can make using the method design cable fault locator device can in case range setting, without survey
Try that blind area, wave character be obvious, clarity of detail, realize that gamut panorama is once tested, have significantly reduce it is fixed to cable fault
The advantages of bit manipulation personnel on site experience and technical foundation rely on, improves cable fault first-aid repair efficiency.
Detailed description of the invention
Fig. 1 is that one group of the test pulse synthesis of 3 range, 3 kinds of pulsewidths of the invention once exports schematic diagram.
Fig. 2 is that one group of the test pulse synthesis of 4 range, 4 kinds of pulsewidths of the invention once exports schematic diagram.
Fig. 3 is that one group of the test pulse synthesis of 5 range, 5 kinds of pulsewidths of the invention once exports schematic diagram.
Wherein, it is exactly the upper multiplicating output for illustrating and being intended to that multrirange of the invention synthesis test pulse, which repeatedly exports,.
Specific embodiment
The present invention is further discussed below below in conjunction with attached drawing.
Such as Fig. 1, Fig. 2, shown in Fig. 3, a kind of method of multrirange synthesis gamut panorama test pulse, including following step
It is rapid:
1) wireline test range is divided into 3-5 range according to full scale；
2) number 3-5 kind difference pulse is corresponded to according to 3-5 measurement range selection of step 1): and select in the following way:
Test pulse transmits in the cable decaying, and the pulse energy of burst pulse is small, equivalent frequency is high, therefore decays more
Fastly, transmission range is small；The pulse energy of broad pulse is big, equivalent frequency is low, therefore it is slow to decay, and long transmission distance works as reflected impulse
Emit pulse with it and be not easy to differentiate the start time point of reflected impulse when having overlapping, cause testing blind zone, therefore, small-range should
Relatively narrow test pulse is selected, wide range should select to be tested with wider test pulse；
3) 3-5 kind test pulse should have reasonable pulsewidth and pulse spacing；
According to the range formula of wave transmissions in cable and reflection:
Wherein, L is fault distance m, and v is the wave transmissions speed of test pulse in the cable, and v=172m/us, lt are to survey
Try the time difference (uS) of pulse-echo and transmitted wave；
4) it is exported by microprocessor driven high-frequency high-voltage sub switch timing on-off, by the 3-5 kind difference arteries and veins of 3-5 range
Wide test pulse synthesizes the one or many outputs of one group of test pulse and is used as panorama test pulse.
Embodiment
Once exporting schematic diagram below with test pulse one group of test pulse of synthesis of 4 range, 4 kinds of pulsewidths shown in Fig. 2 is
Example illustrates.
It is less than 100km by current domestic submarine cable longest, this method example takes full scale 160km, fully meets the country
Market overland cable and the compatible technical need used of submarine cable；Simultaneously, it is contemplated that the growth requirement of overlength submarine cable,
Also consideration takes into account the demand of the fault test of overhead transmission line.
160km full scale is divided into following four testing range according to application again:
750m is applicable in the near terminal fault test of stub cable and long cable；
3.3km is applicable in most overland cable fault test；
33km is applicable in least a portion of overlength cable fault fault test in overland cable；Meanwhile being applicable in most of seabed electricity
Cable fault test；
160km adapts to longer and overlength cable fault test in submarine cable.
Using in the method for impulse method test cable failure, there are two physical phenomenons to select to have to the pulsewidth of test pulse
Technical restriction:
First is that test pulse transmits in the cable decaying, and the pulse energy of burst pulse is small, equivalent frequency is high, therefore
Faster, transmission range is small for decaying；The pulse energy of broad pulse is big, equivalent frequency is low, therefore it is slow to decay, long transmission distance.
Second is that being not easy to differentiate the start time point of reflected impulse when reflected impulse, which emits pulse with it, overlapping, cause
Testing blind zone.
Therefore, small-range should be selected with relatively narrow test pulse, wide range should select with wider test pulse into
Row test.
750m range corresponded between the pulsewidth selection of test pulse 1 and the burst length of test pulse 2 corresponding with range 3.3km
Every selection:
Here, the comfort level realized on combination technology, it is a small amount of that this example test pulse 1 selects pulsewidth 40nS to correspond to 750m
Journey, according to the range formula of wave transmissions in cable and reflection:
Wherein L is fault distance (m), and v is the wave transmissions speed of test pulse in the cable (for generally making in the market
Twisted polyethylene cable it be constant: 172m/us), lt is the time difference of test pulse back wave and transmitted wave
(uS)。
The pulsewidth of test pulse 1 is 40nS, and according to above-mentioned formula, its corresponding testing blind zone is 3.44m, considers test equipment
Test connection line length equivalent can arrive by wireline test range, therefore at this moment test equipment can accomplish no testing blind zone.
Test pulse 1 transmits in the cable necessarily has decaying, and according to the material property of cable and engineering practice, it can
To meet the cable fault test of 1km or so.Therefore, the pulsewidth of the corresponding test pulse 1 of this example selection taken amount journey 750m is
40nS, it should be reasonable.
According to formula: distanceWhen testing the cable fault of the position 750m with test pulse 1, it should be ensured that at least
The reflection interval of primary reflection should retain thereafter the back wave reflection interval of 8.7uS+40nS, this time is exactly to test arteries and veins
The minimum interval of punching 2 and test pulse 1；2 × 8.7uS+ of this time requirement if secondary reflection pulse to be measured
40nS；3 × 8.7uS+40nS of this time requirement if triple reflection pulse to be measured.
3.3km range corresponds to pulsewidth selection and the pulse spacing of corresponding with range 33km test pulse 3 of test pulse 2
Selection:
The pulsewidth of this example selection test pulse 2 is that 200nS corresponds to 3.3km range, according to wave transmissions in cable and instead
The range formula penetrated:
The pulsewidth of test pulse 2 is 200nS, and according to above-mentioned formula, its corresponding testing blind zone is 17.2m, but this method example
It is that four-range panorama is once tested, the cable near terminal fault reflected impulse that can fall on 2 testing blind zone of test pulse can surveyed naturally
It is easily tested in the examination corresponding range of pulse 1, therefore at this moment test equipment can accomplish no testing blind zone.
Test pulse 2 transmits in the cable necessarily has decaying, can be with according to the material property of cable and engineering practice
Meet the cable fault test of 4km or so.Therefore, the pulsewidth of the corresponding test pulse 2 of this example selection taken amount journey 3.3km is
200nS, it should be reasonable.
According to formula: distanceIt should be ensured that when with the cable fault of the 2 test position 3.3km of test pulse test
The reflection interval of back wave at least once should retain thereafter the back wave reflection interval of 38.37uS+200nS, this time is exactly
The minimum interval of test pulse 3 and test pulse 2；If secondary reflection pulse to be measured this time requirement 2 ×
38.37uS+200nS；3 × 38.37uS+200nS of this time requirement if triple reflection pulse to be measured.
33km range corresponds to pulsewidth selection and the pulse spacing of corresponding with range 160km test pulse 4 of test pulse 3
Selection:
The pulsewidth of this example selection test pulse 3 is that 2uS corresponds to 33km range, according to wave transmissions in cable and reflection
Range formula:
The pulsewidth of test pulse 3 is 2uS, and according to above-mentioned formula, its corresponding testing blind zone is 172m, but this method example is
Four-range panorama is once tested, and the cable near terminal fault reflected impulse that can fall on 3 testing blind zone of test pulse can tested naturally
It is easily tested in pulse 1 or the corresponding range of test pulse 2, therefore at this moment test equipment can accomplish no testing blind zone.
Test pulse 3 transmits in the cable necessarily has decaying, can be with according to the material property of cable and engineering practice
Meet the cable fault test of 40km or so.Therefore, the pulsewidth of the corresponding test pulse 3 of this example selection taken amount journey 33km is
2uS, it should be reasonable.
According to formula: distanceWith test pulse test 3 test the positions 33km cable fault when should be ensured that
The reflection interval of few primary reflection, the back wave reflection interval of 383.7uS+2uS should be retained thereafter, this time is exactly to test
The minimum interval of pulse 3 and test pulse 2；2 × 383.7uS of this time requirement if secondary reflection pulse to be measured
+2uS；3 × 383.7uS+2uS of this time requirement if triple reflection pulse to be measured.
160km range corresponds to pulsewidth selection and range 160km corresponding second of test pulse output time of test pulse 4
The selection at interval:
The pulsewidth of this example selection test pulse 4 is that 20uS corresponds to 160km range, according to wave transmissions in cable and reflection
Range formula:
The pulsewidth of test pulse 4 is 20uS, and according to above-mentioned formula, its corresponding testing blind zone is 1720m, but this method example
It is that four-range panorama is once tested, the cable near terminal fault reflected impulse that can fall on 4 testing blind zone of test pulse will necessarily surveyed
It is easily tested in examination pulse 1 or test pulse 2 or the corresponding range of test pulse 3, therefore at this moment test equipment can accomplish no survey
Try blind area.
Test pulse 4 transmits in the cable necessarily has decaying, can be with according to the material property of cable and engineering practice
Meet the cable fault test of 200km or so.Therefore, the pulsewidth of the corresponding test pulse 4 of this example selection taken amount journey 160km is
20uS, it should be reasonable.
According to formula: distanceIt should be ensured that when with the cable fault of the 4 test position 160km of test pulse test
The reflection interval of back wave at least once should retain thereafter the back wave reflection interval of 1861uS+20uS, this time is exactly to survey
Try the minimum interval of pulse 4 and second test pulse；If secondary reflection pulse to be measured this time requirement 2 ×
1861uS+20uS；3 × 1861uS+20uS of this time requirement if triple reflection pulse to be measured.
Have above-mentioned 750m, 3.3km, 33km, four test arteries and veins corresponding to tetra- testing ranges of 160km by microprocessor root
Punching 1,2,3,4 and its pulse interval driving high-frequency high-voltage sub switch timing on-off output, are realized above-mentioned 4 kinds different arteries and veins
Wide test pulse 1,2,3,4 synthesizes the one or many outputs of one group of test pulse and is used as one group of panorama test pulse, realizes this
Method example: the method for four-range synthesis gamut panorama test pulse.
A kind of method of multrirange synthesis gamut panorama test pulse, positions for cable fault described in this programme,
It is suitble to design cable fault locator device in this approach for using in cable maintenance work, has and exempt from range setting, without test
Blind area, waveform show that feature is obvious, clarity of detail, have can significantly reduce to cable fault positioning operation personnel on site experience and
The advantages of technical foundation relies on improves cable fault first-aid repair efficiency, ensures power supply safety.
Claims (1)
1. a kind of method of multrirange synthesis gamut panorama test pulse, which comprises the following steps:
1) wireline test range is divided into 3-5 range according to full scale；
2) number 3-5 kind difference pulse is corresponded to according to 3-5 measurement range selection of step 1): and select in the following way:
Test pulse transmits in the cable decaying, and the pulse energy of burst pulse is small, equivalent frequency is high, therefore decays faster,
Transmission range is small；The pulse energy of broad pulse is big, equivalent frequency is low, therefore it is slow to decay, long transmission distance, when reflected impulse and its
Transmitting pulse, which has, to be not easy to differentiate the start time point of reflected impulse when overlapping, causes testing blind zone, therefore, small-range should select
With relatively narrow test pulse, wide range should select to be tested with wider test pulse；
3) 3-5 kind test pulse should have reasonable pulsewidth and pulse spacing；
According to the range formula of wave transmissions in cable and reflection:
Wherein, L is fault distance m, and v is the wave transmissions speed of test pulse in the cable, and v=172m/us, lt are test arteries and veins
Rush the time difference (uS) of back wave and transmitted wave；
4) it is exported by microprocessor driven high-frequency high-voltage sub switch timing on-off, by the 3-5 kind distinct pulse widths of 3-5 range
Test pulse synthesizes the one or many outputs of one group of test pulse and is used as panorama test pulse.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112540268A (en) * | 2020-12-28 | 2021-03-23 | 中天科技海缆股份有限公司 | Transmission line fault detection |
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| US6677761B1 (en) * | 2001-12-12 | 2004-01-13 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Wire insulation defect detector |
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