CN102213736A - Method and system for detecting offline state of locomotive pantograph net - Google Patents
Method and system for detecting offline state of locomotive pantograph net Download PDFInfo
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- CN102213736A CN102213736A CN2011100883665A CN201110088366A CN102213736A CN 102213736 A CN102213736 A CN 102213736A CN 2011100883665 A CN2011100883665 A CN 2011100883665A CN 201110088366 A CN201110088366 A CN 201110088366A CN 102213736 A CN102213736 A CN 102213736A
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Abstract
The invention relates to a method for detecting the offline state of a locomotive pantograph net, wherein a first pantograph and a second pantograph are connected by utilizing an overline cable. The method provided by the invention comprises the following steps: obtaining the amplitude and duration of the overline current which passes through the overline cable; computing the area of the two-dimensional region which is formed by the amplitude and duration of the overline current and using as the offline energy area; and judging the offline state of the pantograph net according to the offline energy area. The invention also discloses a system for detecting the offline state of the locomotive pantograph net. In the invention, the offline state is judged by leading into the concept of the offline energy area, and the influence of the pantograph net offline on the current acceptance effect can be really reflected.
Description
Technical field
The present invention relates to the electric locomotive field, particularly relate to a kind of locomotive bow net off-line state detection method and system.
Background technology
In electric railway, the operation of locomotive need be obtained electric energy with contacting of contact line conducting wire by the pantograph at its top.Therefore the contact condition of pantograph and contact wire directly affects the current carrying quality of locomotive.Generally, the locomotive of high-speed cruising will be difficult to obtain stable contact, and a lot of problems will appear in motorcycle pantograph and contact wire when contact condition is relatively poor, as produce off-line electric arc, loss between increasing pantograph pan and contact wire etc., the speed that locomotive is exercised is big more, and these problems will be serious more.In order to make locomotive can obtain current carrying quality preferably, the off-line state that needs to detect pantograph and contact net is come guide maintenance work.
At present, it is to detect the electric arc that is caused by off-line that bow net off-line state comparatively commonly used detects, during monitoring, adopt the electric arc shooting technology that the picture of pantograph arcing is noted, analyze pantograph arcing picture by image processing techniques again, obtain correlation parameter, judge locomotive bow net off-line state.Though this method can obtain locomotive bow net off-line state, influenced by extraneous light bigger because of the electric arc shooting technology, and the anti-light interference performance of testing process is very poor, and deviation appears in testing result easily.For example, when the locomotive process of passing through tunnel, the lighting installation in the tunnel directly influences the electric arc effect of taking pictures, and this just may cause the erroneous judgement of locomotive bow net off-line state.
Summary of the invention
Technical matters to be solved by this invention provides a kind of locomotive bow net off-line state detection method, and this method is introduced the notion of off-line energy area and judged off-line state, can reflect really that the bow net off-line is for the influence of being flowed effect.
The invention provides a kind of locomotive bow net off-line state detection method, use the cross-line cable to connect first pantograph and second pantograph, this method comprises: the cross-line current amplitude and the cross-line current duration that obtain the cross-line cable of flowing through, the 2 dimensional region area that calculating is made of cross-line current amplitude and cross-line current duration is as off-line energy area; Judge the bow net off-line state according to off-line energy area.
Preferably, calculating the 2 dimensional region area be made of cross-line current amplitude and cross-line current duration is specially: establish cross-line electric current I=f (t) at [a, b] in the time period, at [a, b] insert several branches in the time period, [a, the b] time period is divided into n minizone; Take up an official post in each minizone and to get 1 ζ i, functional value f (ζ i) is f (ζ i) * Δ xi with the product of minizone length Δ xi; Calculate
Wherein S is the 2 dimensional region area.
Preferably, judge that according to off-line energy area the bow net off-line state comprises: greater than first setting value, determine that the bow net off-line state is big off-line state as off-line energy area.
Preferably, judge that according to off-line energy area the bow net off-line state comprises: less than second setting value, determine that the bow net off-line state is little off-line state as off-line energy area.
Preferably, judge that according to off-line energy area the bow net off-line state comprises: less than the 3rd setting value, cross-line current opposite in direction and amplitude are approximate, determine that the bow net off-line state is the symmetric form off-line state as off-line energy area.
Preferably, obtain the distance value S ' between first pantograph and second pantograph, the time t3 of the time t2 of the first pantograph generation off-line and the second pantograph generation off-line, and locomotive is through the time t1 of an object of reference;
According to formula
Obtain the current travelling speed v of locomotive;
According to formula
Obtain the hard spot position at the above-mentioned object of reference of distance along locomotive driving direction s place.
The present invention also provides a kind of locomotive bow net off-line state detection system, and this system introduces the notion of off-line energy area and judges off-line state, can reflect really that the bow net off-line is for the influence of being flowed effect.
A kind of locomotive bow net of the present invention off-line state detection system, comprise the cross-line cable that connects first pantograph and second pantograph, the current sensing means that is connected with the cross-line cable, the processor that is connected with current sensing means, described processor comprises off-line energy area computing module and bow net off-line state judge module: off-line energy area computing module, be used to obtain flow through the cross-line current amplitude and the cross-line current duration of cross-line cable, the 2 dimensional region area that calculating is made of cross-line current amplitude and cross-line current duration is as off-line energy area; Bow net off-line state judge module is used for judging the bow net off-line state according to off-line energy area.
Technical matters to be solved by this invention provides a kind of locomotive bow net off-line state detection method, and this method is introduced the notion of off-line energy area and judged off-line state, can reflect really that the bow net off-line is for the influence of being flowed effect.The 2 dimensional region area that calculates cross-line current amplitude and cross-line current duration formation is specially: establish cross-line electric current I=f (t) and in the time period, in time period insert several branches at [a, b] at [a, b], [a, the b] time period is divided into n minizone; Take up an official post in each minizone and to get 1 ζ i, functional value f (ζ i) is f (ζ i) * Δ xi with the product of minizone length Δ xi;
Calculate
Wherein S is the 2 dimensional region area.
Technical matters to be solved by this invention provides a kind of locomotive bow net off-line state detection method, and this method is introduced the notion of off-line energy area and judged off-line state, can reflect really that the bow net off-line is for the influence of being flowed effect.Bow net off-line state judge module comprises that big off-line state judges submodule, is used for as off-line energy area determining that greater than first setting value bow net off-line state is big off-line state.
Technical matters to be solved by this invention provides a kind of locomotive bow net off-line state detection method, and this method is introduced the notion of off-line energy area and judged off-line state, can reflect really that the bow net off-line is for the influence of being flowed effect.Bow net off-line state judge module comprises that little off-line state judges submodule, is used for as off-line energy area determining that less than second setting value bow net off-line state is little off-line state.
Technical matters to be solved by this invention provides a kind of locomotive bow net off-line state detection method, and this method is introduced the notion of off-line energy area and judged off-line state, can reflect really that the bow net off-line is for the influence of being flowed effect.Bow net off-line state judge module comprises that the symmetric form off-line state judges submodule, is used for as off-line energy area less than the 3rd setting value, and cross-line current opposite in direction and amplitude are approximate, determine that the bow net off-line state is the symmetric form off-line state.
Compared with prior art, the present invention has the following advantages:
The present invention introduces the notion of off-line energy area and judges off-line state, what off-line energy area was considered no longer is simple cross-line current amplitude or off-line duration, but the 2 dimensional region area that will be made of cross-line current amplitude and cross-line current duration is as off-line energy area, and it is more objective to judge.The present invention judges the bow net off-line state according to off-line energy area, not only can realize simple filter action to the sampled data of cross-line current amplitude, also can shield high-frequency interferencing signal, reflects that really the bow net off-line is for the influence of being flowed effect.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, to do to introduce simply to the accompanying drawing of required use among prior art and the embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is for illustrating locomotive bow net of the present invention system;
Fig. 2 is a locomotive bow net off-line state detection method process flow diagram of the present invention;
Fig. 3 is an off-line energy area synoptic diagram of the present invention;
Fig. 4 is little off-line state oscillogram;
Fig. 5 is big off-line state oscillogram;
Fig. 6 is a symmetric form off-line state oscillogram;
Fig. 7 is a locomotive bow net off-line state detection system structural representation;
Fig. 8 is a bow net off-line state judge module structural representation.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1, locomotive bow net of the present invention system is shown.Comprise first pantograph 21 and second pantograph 22, short circuit first pantograph 21 and second pantograph, 22 cross-line cables 23.
During locomotive was exercised, as pantograph generation off-line, the moment that bow net breaks away from can produce electric arc with near the air ionization the contact point, exists arc voltage to fall between pantograph and the contact net.As first pantograph 21 off-line takes place, because the short circuit effect of cross-line cable 23, the one part of current that is subjected to first pantograph 21 of flowing through originally can enter trailer system through cross-line cable 23, and the cross-line size of current of cross-line cable 23 depends on the off-line state of pantograph.Otherwise, off-line, then cross-line current opposite in direction take place as second pantograph 22.
Referring to Fig. 2, locomotive bow net off-line state detection method of the present invention is shown, concrete steps are as follows.
Step S201, the cross-line current amplitude that obtains the cross-line cable 23 of flowing through and cross-line current duration calculate the 2 dimensional region area that is made of cross-line current amplitude and cross-line current duration, as off-line energy area.
Seeing Fig. 3, is the y axle with the cross-line electric current I, and cross-line current duration t is the x axle, constitutes a 2 dimensional region, and the concrete computing method of this 2 dimensional region are:
If in the time period, current amplitude reaches the off-line standard to cross-line electric current I=f (t) at [a, b], [a, b] insert in the time period several branches x0＜x1＜... xn-1＜xn; Wherein, X0=a, Xn=b;
[a, the b] time period is divided into n minizone, is respectively [x0, x1], [x1, x2] ... [xn-1, xn];
If each minizone is [xi-1, xi], i=1,2,3,4.....n, in each minizone [xi-1, xi] take up an official post get 1 ζ i (xi-1≤ζ i≤xi), functional value f (ζ i) is f (ζ i) * Δ xi with the product of minizone length Δ xi;
Calculate
Wherein S is the 2 dimensional region area, i.e. off-line energy area.
Step S202, judge the bow net off-line state according to off-line energy area.Less than second setting value, determine that the bow net off-line state is little off-line state as off-line energy area; Greater than first setting value, determine that the bow net off-line state is big off-line state as off-line energy area; Less than the 3rd setting value, cross-line current opposite in direction and amplitude are approximate, determine that the bow net off-line state is the symmetric form off-line state as off-line energy area.First setting value is greater than second setting value, and first setting value, second setting value and the 3rd setting value rule of thumb are worth setting.
See Fig. 4, Fig. 5 and Fig. 6, be respectively the little off-line state (the short time discharge takes place) of bow net off-line, big off-line state (discharge for a long time takes place) and symmetric form off-line (coming in contact the discharge of net hard spot place).When little off-line state takes place, a spot of pulse waveform is arranged in the cross-line electric current, the most of the time is in zero current condition, and off-line energy area is little.When big off-line state took place, the cross-line electric current constantly produced pulse spike, and the duration of pulse is longer, and current amplitude is bigger, and off-line energy area is also bigger.When the symmetric form off-line takes place, it is close that two amplitudes appear in the showing as of cross-line electric current, and the pulse waveform that direction is opposite (being symmetrical structure), because hard spot is generally more concentrated, the off-line time of origin is generally in 20ms, so this moment, off-line energy area was generally little, cross-line current opposite in direction and size are approaching.
The infringement that the bow net off-line causes equipment is except big electric current, big voltage arcing exert an influence to device security, and the off-line time also is a very important index.Generally judge the bow net off-line state in the prior art with off-line duration and ratio of contact loss.For example, the off-line duration is little off-line at 0～10ms; The off-line duration is middle off-line at 10～100ms, and the off-line duration is big off-line greater than 100ms.This paper has introduced the notion of off-line energy area and has carried out the judgement of off-line state, what off-line energy area was considered no longer is simple cross-line current amplitude or off-line duration, but the 2 dimensional region area that will be made of cross-line current amplitude and cross-line current duration is as off-line energy area, judge more comprehensively, more objective.
The present invention judges the bow net off-line state according to off-line energy area, not only can realize simple filter action to the sampled data of cross-line current amplitude, also high-frequency interferencing signal is had certain shielding action, reflects that really the bow net off-line is for the influence of being flowed effect.
Because have hard spot on the contact net, the bow net off-line all can take place when sliding to the hard spot place in pantograph, and is accompanied by the appearance of arcing at every turn.Because the cross-line cable couples together two pantographs, when two pantographs were passed through this hard spot place successively, it is close that two amplitudes appear in the cross-line electric current, the pulse waveform that direction is opposite (being symmetrical structure).The method that the present invention calculates position, hard spot place is as follows.
If t1 is constantly, locomotive is through the A platform, t2 constantly, off-line appears in first pantograph, t3 constantly, off-line appears in second pantograph, and the cross-line current waveform to present amplitude close, the symmetrical structure that direction is opposite, then
Wherein S ' equals the distance between two pantographs; Between two pantographs apart from S ' known case under, can obtain current vehicle speed is v;
Calculate
Obtain position, hard spot place at the distance A platform along locomotive driving direction s place.
Like this, the present invention can not need measure the current travelling speed of locomotive, calculates the position at hard spot place, and the calculation deviation of avoiding the speed pickup error to take to effectively improves the computational accuracy of position, hard spot place.
Based on the invention described above locomotive bow net off-line state detection method, the present invention also provides a kind of locomotive bow net off-line state detection system.Referring to Fig. 7, this system comprises first pantograph 21 and second pantograph 22, short circuit first pantograph 21 and second pantograph, 22 cross-line cables 23.The current sensing means 24 that is connected with cross-line cable 23, the processor 25 that is connected with current sensing means 24, processor 25 comprise off-line energy area computing module 251 and bow net off-line state judge module 252:
Off-line energy area computing module 251 obtains the cross-line current amplitude and the cross-line current duration of the cross-line cable of flowing through, the 2 dimensional region area that calculating is made of cross-line current amplitude and cross-line current duration, as off-line energy area, send to bow net off-line state judge module 252.
Bow net off-line state judge module 252 is judged the bow net off-line state according to off-line energy area.
See Fig. 8, bow net off-line state judge module 252 comprises big off-line state judgement submodule 2521, little off-line state judgement submodule 2522 and symmetric form off-line state judgement submodule 2523.
Big off-line state judges that submodule 2521 is used for as off-line energy area determining that greater than first setting value bow net off-line state is big off-line state; Bow net off-line state judge module 2522 comprises that little off-line state judges submodule, is used for as off-line energy area determining that less than second setting value bow net off-line state is little off-line state; Bow net off-line state judge module 2523 comprises that the symmetric form off-line state judges submodule, is used for as off-line energy area less than the 3rd setting value, and cross-line current opposite in direction and amplitude are approximate, determine that the bow net off-line state is the symmetric form off-line state.
The above only is a preferred implementation of the present invention; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications; also can above-mentioned embodiment make up, these technical schemes of improving, retouching and being combined to form also should be considered as protection scope of the present invention.
Claims (11)
1. a locomotive bow net off-line state detection method is characterized in that, uses the cross-line cable to connect first pantograph and second pantograph, and this method comprises:
Obtain the cross-line current amplitude and the cross-line current duration of the cross-line cable of flowing through, calculate the 2 dimensional region area that constitutes by cross-line current amplitude and cross-line current duration, as off-line energy area;
Judge the bow net off-line state according to off-line energy area.
2. the method for claim 1 is characterized in that, calculates the 2 dimensional region area that is made of cross-line current amplitude and cross-line current duration and is specially:
If cross-line electric current I=f (t) in the time period, in time period inserts several branches at [a, b] at [a, b], [a, the b] time period is divided into n minizone;
Take up an official post in each minizone and to get 1 ζ i, functional value f (ζ i) is f (ζ i) * Δ xi with the product of minizone length Δ xi;
Calculate
Wherein S is the 2 dimensional region area.
3. method as claimed in claim 1 or 2 is characterized in that, judges that according to off-line energy area the bow net off-line state comprises:
Greater than first setting value, determine that the bow net off-line state is big off-line state as off-line energy area.
4. method as claimed in claim 1 or 2 is characterized in that, judges that according to off-line energy area the bow net off-line state comprises:
Less than second setting value, determine that the bow net off-line state is little off-line state as off-line energy area.
5. method as claimed in claim 1 or 2 is characterized in that, judges that according to off-line energy area the bow net off-line state comprises:
Less than the 3rd setting value, cross-line current opposite in direction and amplitude are approximate, determine that the bow net off-line state is the symmetric form off-line state as off-line energy area.
6. method as claimed in claim 5 is characterized in that, also comprises:
Obtain the distance value S ' between first pantograph and second pantograph, the time t3 of the time t2 of the first pantograph generation off-line and the second pantograph generation off-line, and locomotive is through the time t1 of an object of reference;
According to formula
Obtain the current travelling speed v of locomotive;
According to formula
Obtain the hard spot position at the above-mentioned object of reference of distance along locomotive driving direction s place.
7. locomotive bow net off-line state detection system, it is characterized in that, comprise the cross-line cable that connects first pantograph and second pantograph, the current sensing means that is connected with the cross-line cable, the processor that is connected with current sensing means, described processor comprise off-line energy area computing module and bow net off-line state judge module:
Off-line energy area computing module is used to obtain flow through the cross-line current amplitude and the cross-line current duration of cross-line cable, calculates the 2 dimensional region area that is made of cross-line current amplitude and cross-line current duration, as off-line energy area;
Bow net off-line state judge module is used for judging the bow net off-line state according to off-line energy area.
8. system as claimed in claim 7 is characterized in that, the 2 dimensional region area that calculates cross-line current amplitude and cross-line current duration formation is specially:
If cross-line electric current I=f (t) in the time period, in time period inserts several branches at [a, b] at [a, b], [a, the b] time period is divided into n minizone;
Take up an official post in each minizone and to get 1 ζ i, functional value f (ζ i) is f (ζ i) * Δ xi with the product of minizone length Δ xi;
Calculate
Wherein S is the 2 dimensional region area.
9. as claim 7 or 8 described systems, it is characterized in that bow net off-line state judge module comprises that big off-line state judges submodule, be used for as off-line energy area determining that greater than first setting value bow net off-line state is big off-line state.
10. as claim 7 or 8 described systems, it is characterized in that bow net off-line state judge module comprises that little off-line state judges submodule, be used for as off-line energy area determining that less than second setting value bow net off-line state is little off-line state.
11. as claim 7 or 8 described systems, it is characterized in that, bow net off-line state judge module comprises symmetric form off-line state judgement submodule, be used for as off-line energy area less than the 3rd setting value, cross-line current opposite in direction and amplitude are approximate, determine that the bow net off-line state is the symmetric form off-line state.
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| CN103085666A (en) * | 2011-11-03 | 2013-05-08 | 中国北车股份有限公司大连电力牵引研发中心 | Processing method for offline electric locomotive pantograph, processing system and electric locomotive |
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| CN102680824A (en) * | 2012-05-16 | 2012-09-19 | 浙江大学 | Electric energy quality detecting and analyzing system for pantograph-catenary current collection based on DSP (Digital Signal Processor) |
| CN102830297A (en) * | 2012-07-19 | 2012-12-19 | 北京交通大学 | Dynamic off-line experimental device of bow net |
| CN114475708A (en) * | 2021-12-28 | 2022-05-13 | 中车永济电机有限公司 | Detection method and device for transient offline of pantograph-catenary of motor train unit |
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| CN102213736B (en) | 2013-01-30 |
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