CN202870236U - Novel single-ended travelling wave distance measuring system for fault of high-speed railway traction network - Google Patents
Novel single-ended travelling wave distance measuring system for fault of high-speed railway traction network Download PDFInfo
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- CN202870236U CN202870236U CN 201220268091 CN201220268091U CN202870236U CN 202870236 U CN202870236 U CN 202870236U CN 201220268091 CN201220268091 CN 201220268091 CN 201220268091 U CN201220268091 U CN 201220268091U CN 202870236 U CN202870236 U CN 202870236U
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Abstract
The utility model discloses a novel single-ended travelling wave distance measuring system for a fault of a high-speed railway traction network. The novel single-ended travelling wave distance measuring system is characterized in that a high-voltage pulse switch (5) positioned in a high-voltage pulse generation device (11) is connected with a high-speed railway traction network bus, and when a high-speed railway traction network line is broken down, the high-voltage pulse switch (5) is switched off and a travelling wave signal is generated on the high-speed railway traction network line; and a travelling wave signal sensor (12) is adjacent to the high-voltage pulse switch (5) and mounted below the high-speed railway traction network bus without contacting with the high-speed railway traction network bus, the travelling wave signal acquired by the travelling wave signal sensor (12) is input into an input interface of a high-speed data acquisition system (13) with a plurality of passages through a signal wire (9), and the high-speed data acquisition system (13) is connected with a processor (14). According to the utility model, an active type distance measuring method is adopted, the highest sampling frequency of the single passage reaches 100 MHz, and the caused positioning error of a fault point can be controlled within 3 m.
Description
Technical field
The utility model belongs to field of measuring technique, relates to a kind of high-speed railway and draws net fault novel single-end travelling wave ranging system.
Background technology
High-speed railway is runed wide range in China, contact net is the important component part of high-speed railway traction generator, it is undertaking incessantly the vital task to operating electric locomotive transmission of electric energy along the line, because contact net is for setting up along the line, without for subsequent use, also be relatively weaker link in the electric propulsion again.Because a variety of causes, traction net High-Voltage Electrical Appliances and circuit along the line short circuit often occurs, opens circuit, high resistant (flashover) fault.Expose to wind and rain, flying bird perches, kite is made contact etc., all may cause accident, dangerous fault.The number of fault, the speed of repairing not only can affect transportation by railroad, also can cause serious power supply, consumer, material resources loss, even jeopardize personnel's life security.Mainly contain two kinds of impedance method and traveling wave methods for traction netting twine road fault localization at present.For impedance method, because actual railway track generally is in the single ended power supply power supply state, when the supply arm fault, can only find range with single-end electrical quantity.Therefore impedance method will be subject to the impact of transition impedance and tested line impedance unevenness inevitably, has a strong impact on distance accuracy.On the other hand, for traveling wave method, in modern complex electric network, the fault of any point or operation all can produce numerous capable ripple in electrical network, and the severe jamming localization of fault easily causes erroneous judgement disconnected.And existing traveling wave method generally adopts the form of passive type both-end distance measuring, because line fault row ripple is disposable, only can carry out disposable measurement, judgement, can not effectively realize the contrast to undesired signal.Simultaneously, because electrified railway traction networks supply voltage high (being generally 27.5KV) is longer at the duration of oscillation that checkout equipment causes, can not effectively identify for close-in fault.And the both-end traveling wave method is because the impact of two ends timing tracking accuracy (such as gps clock) has seriously limited the raising of distance accuracy.
Summary of the invention
Defects for the existence of existing high-speed railway traction net distance measuring equipment, the purpose of this utility model is to propose a kind of Novel active Single Terminal Traveling Wave Fault Location system, this system can send repeatedly high-voltage pulse signal to circuit, compare repeatedly for test result repeatedly, get rid of possible interference, improve accuracy and the precision measured.Simultaneously, adopt the novel high-pressure pulse generating unit, effectively dwindle pulse signal width, with satisfied needs for closely detecting, thereby provide a kind of high-speed railway to draw net fault novel single-end travelling wave ranging system.
The technical solution of the utility model is: it comprises high voltage pulse generation device, travelling wave signal sensor, high-speed data acquistion system and processor, high voltage pulse switch in the described high voltage pulse generation device is connected with high-speed railway traction net bus, when break down in high-speed railway traction netting twine road, high voltage pulse switch is closed, produces travelling wave signal on high-speed railway traction netting twine road; Travelling wave signal sensor and high voltage pulse switch are adjacent and be installed on the below that high-speed railway draws the net bus, do not contact with high-speed railway traction net bus, and high-speed railway traction net is carried out non-contact measurement along the travelling wave signal that circuit transmits; The travelling wave signal that the travelling wave signal sensor collects is input to the input interface of the high-speed data acquistion system with a plurality of passages by signal wire, and high-speed data acquistion system is connected with processor.
Further: described high voltage pulse generation device output high-voltage pulse signal voltage magnitude 〉=27.5KV is limited in the high-voltage pulse signal width that produces in the 100ns; The travelling wave signal sensor is the sensor of being made by Luo-coil; The highest proportion of single passage of described high-speed data acquistion system reaches 100MHz.
Described high voltage pulse generation device comprises high voltage direct current generator, impulse capacitor and high voltage pulse switch, high voltage pulse switch is spark switch, tripping operation after breaking down in high-speed railway traction netting twine road, high voltage direct current generator charges to impulse capacitor, then by impulse capacitor discharge and the high voltage pulse switch through being attached thereto, repeatedly high-voltage pulse signal is sent on monitored high-speed railway traction netting twine road.
Described travelling wave signal sensor adopts ambroin parcel Luo-coil, and the Luo-coil bottom is provided with high-tension porcelain insulator, and the high-tension porcelain insulator bottom is provided with signal wire and grounding ports.
Described high-speed data acquistion system arranges 4 passages, low-voltage and the little current signal of 4 groups of travelling wave signal sensor outputs of synchronous acquisition, and record travelling wave signal wave head information.
The control module of described processor is designed to: high-speed railway traction netting twine road tripping operation after high-speed railway traction net breaks down starts high voltage pulse generation device repeatedly high-voltage pulse signal is sent on monitored high-speed railway traction netting twine road; Control travelling wave signal sensor picks up the fault traveling wave electric current, starts high-speed data acquistion system and monitors, and the assay surface that the signal that collects is reached processor carries out waveform drawing, the localization of faults.
Compared with prior art, the beneficial effects of the utility model are:
1. the utility model adopts the method for active depth measuring, and under the failure condition of high-speed railway traction netting twine road, repeatedly duplicate measurements compares analysis to measurement result, is conducive to improve the accuracy of range finding.
2. the high-voltage pulse signal generating means adopts the spark switch technology, and this technology has a lot of outstanding features, has good trigger characteristic, the high-voltage pulse signal width can be limited in the 100ns, can realize the detection to close-in fault.
3. the travelling wave signal sensor can be realized the non-contact measurement to high-speed railway traction netting twine road fault, response 〉=30MHz for high-frequency signal, can bear the voltage change 〉=27.5KV on high-speed railway traction netting twine road, can accurately capture the radio-frequency component in the travelling wave signal, for low-frequency component, the radio-frequency component amplitude rise time is short, and variable quantity is large in the unit interval, more is conducive to the detection for the travelling wave signal due in.
4. high-speed data acquistion system arranges 4 passages, can gather simultaneously the travelling wave ranging signal of 4 different feeder lines, the highest proportion of single passage reaches 100MHz, but accurate recording travelling wave signal wave head information, and the localization of fault error that is caused by capture card can be controlled in the 3m.
Description of drawings:
Fig. 1 is the utility model embodiment 1 high voltage pulse generation device structured flowchart.
Fig. 2 is the utility model embodiment 1 travelling wave signal sensor construction block diagram.
Fig. 3 is the utility model embodiment 1 principle of work block diagram.
Fig. 4 is the utility model embodiment 1 FB(flow block).
Fig. 5 is the utility model embodiment 1 original signal waveform figure.
Fig. 6 is the location waveform sectional drawing after the utility model embodiment 1 treated device analyzing and processing.
Among the figure: high pressure generator control panel 1, high voltage direct current generator 2, impulse capacitor 3, digital high voltage table 4, high voltage pulse switch 5, ambroin 6, Luo-coil 7, high-tension porcelain insulator 8, signal wire 9, grounding ports 10, high voltage pulse generation device 11, travelling wave signal sensor 12, high-speed data acquistion system 13, processor 14.
Embodiment
The utility model is by the following examples can the utility model will be further described, yet scope of the present utility model is not limited to following embodiment.
Embodiment 1: it comprises high voltage pulse generation device 11, travelling wave signal sensor 12, high-speed data acquistion system 13 and processor 14.
Described high voltage pulse generation device 11 is as shown in Figure 1: be made of high pressure generator control panel 1, high voltage direct current generator 2, impulse capacitor 3, digital high voltage table 4 and high voltage pulse switch 5, adopt high voltage direct current generator 2, impulse capacitor 3, high voltage pulse switch 5 to build the high-voltage pulse signal generating means, output high-voltage pulse signal voltage magnitude 〉=27.5KV.Its high-voltage switch adopts spark switch technology, the high-voltage pulse signal width that produces is limited in the 100ns, to satisfy closely (trouble spot is far from the needs of range finding of monitoring point distance≤50m).The major technique of this device is to be charged to impulse capacitor by high voltage direct current generator when high-speed railway traction net breaks down, then by impulse capacitor discharge process high-voltage switch gear, circuit is sent repeatedly high-voltage pulse signal, carry out the detection to primary fault signal and feedback signal.
Travelling wave signal sensor 12 is as shown in Figure 2: be placed in the high-voltage pulse generator end, adopt ferromagnetic material to improve its sensitivity, adopt ambroin 6 parcel Luo-coils 7, Luo-coil 7 bottoms equipment high-tension porcelain insulator, realize travelling wave signal sensor 12 and high-tension reliable isolation, and be provided with special-purpose signal wire 9 and grounding ports 10, the major technique of one's own profession ripple signal transducer is the non-contact measurement that can realize high-speed railway traction netting twine road fault, response 〉=30MHz for high-frequency signal, can accurately capture the radio-frequency component in the travelling wave signal, for low-frequency component, the radio-frequency component amplitude rise time is short, variable quantity is large in unit interval, more is conducive to the detection for the travelling wave signal due in.
According to electromagnetic induction principle, as long as the magnetic line of force of the variation magnetic field that row ripple By Impulsive Current produces passes hub of a spool, will produce induction electromotive force u
c
In the formula, φ---magnetic flux; Β---magnetic induction density; μ---magnetic permeability; N---coil turn; Ac---coil section is long-pending; R---coil and feeder line distance; I---travelling wave signal pickup leads electric current.
The characteristics of the sensor of travelling wave signal shown in the embodiment 12 are:
1. see with practical conditions that some operation also can produce numerous capable ripple in electrical network in the complicated traction net of Modern High-Speed railway, but its current changing rate than fault traveling wave slowly many; Higher when larger its sensitivity of current changing rate, therefore be conducive to pick up the fault traveling wave electric current, suppress to disturb the row ripple.
2. among Fig. 2, the travelling wave signal pickup leads is vertical with coil; By changing the number of turn of Luo-coil 7, adjust distance distance etc., just can change the size of induced voltage.Therefore, has making easily, characteristics with low cost, easy to adjust.
3. adopt ferromagnetic material to improve its sensitivity.
4. adopt ambroin parcel coil, coil bottom equipment high-tension porcelain insulator is realized sensor and high-tension reliable isolation, and is provided with special-purpose grounding ports.
5. because inductance is very little, and distributed capacitance is also very little, its high frequency response can be very high, actual high frequency response 〉=30MHz;
6. output LOW voltage, little current signal.
High-speed data acquistion system 13 arranges 4 passages, but low-voltage and the little current signal of 4 groups of traveling wave sensor outputs of synchronous acquisition are monitored many feeder lines simultaneously with realization.High-speed data acquistion system 13 is digital signal with the analog signal conversion that collects, and the data processing module that is transferred to the rear end is that processor 14 carries out Algorithm Analysis and location.For improving the accuracy of fault traveling wave wave head record, the highest proportion of the single passage of 4 passage capture cards reaches 100MHz, and namely the time interval between the two adjacent sampled points is t=10ns, because row wave speed gets 3 * 10 less than light velocity c(c
8M/s), the therefore range difference Δ S＜t between the two adjacent sampled points * c=3m, namely the localization of fault error that causes of capture card is less than 3m.
Described processor 14(computer) control module is designed to: high-speed railway traction netting twine road tripping operation after high-speed railway traction net breaks down starts 11 pairs of monitored high-speed railway traction netting twine roads of high voltage pulse generation device and sends repeatedly high-voltage pulse signal; Control travelling wave signal sensor 12 picks up the fault traveling wave electric current, starts high-speed data acquistion system 13 and monitors, and the assay surface that the signal that collects is reached processor 14 carries out waveform drawing, the localization of faults.
The distance-finding method of present embodiment high-speed railway traction net fault novel single-end travelling wave ranging system: high-speed railway traction netting twine road tripping operation after high-speed railway traction net breaks down, the control module of processor 14 starts, connect high voltage direct current generator 2 and impulse capacitor 3, closed high pulse switch 5, through high voltage pulse switch 5, repeatedly high-voltage pulse signal is sent on monitored high-speed railway traction netting twine road by impulse capacitor 3 discharges; The signal of high voltage pulse generation device 11 emissions runs into the trouble spot and reflects, travelling wave signal sensor 12 picks up the fault traveling wave electric current by signal wire, the fault current that is picked up by travelling wave signal sensor 12 by the capture card collection of high-speed data acquistion system 13 again, low-voltage and the little current signal of 12 outputs of 4 groups of travelling wave signal sensors of synchronous acquisition, high-speed data acquistion system 13 reaches the signal that collects the assay surface of processor 14, processor 14 is drawn out fault waveform, calculate the trouble spot distance, realize localization of fault.
In conjunction with Fig. 4, with Tianjin Nan Cang traction substation, experimental line is chosen as the Shanghai direction
Feeder line is example, once analyzes.When traction net feeder line breaks down, start the protection for feed line action in the time at 80ms; Pass through again the time circuit breaker trip of 50ms; At this moment, on-load switch closes a floodgate and to impulse capacitor 3 chargings, stops charging behind the setting voltage that is charged to impulse capacitor 3, and discharge to faulty line by high voltage pulse switch 5; When fault-signal process travelling wave signal sensor 12, travelling wave signal sensor 12 will pick up the fault current signal and it is reached high-speed data acquistion system 13; Then by high-speed data acquistion system 13 data are reached drafting and the location that processor 14 carries out fault waveform.
Among Fig. 5, Fig. 6, circle institute gauge point is initial wavefront and first reflection point failure wave head position.Can draw the mistiming of first reflection ripple and primary wave thus, and then multiply by velocity of wave and can accurately locate the trouble spot.As seen from the figure, the interference that the waveform after algorithm process has effectively filtered out the oscillator signal of noise signal and the generation of row ripple self has realized the accurate location to the trouble spot.
Claims (6)
1. a high-speed railway draws net fault novel single-end travelling wave ranging system, it comprises high voltage pulse generation device (11), travelling wave signal sensor (12), high-speed data acquistion system (13) and processor (14), it is characterized in that: the high voltage pulse switch (5) in the described high voltage pulse generation device (11) is connected with high-speed railway traction net bus, when break down in high-speed railway traction netting twine road, high voltage pulse switch (5) closure produces travelling wave signal on high-speed railway traction netting twine road; Travelling wave signal sensor (12) is adjacent with high voltage pulse switch (5) and be installed on the below of high-speed railway traction net bus, do not contact with high-speed railway traction net bus, the travelling wave signal that travelling wave signal sensor (12) collects is input to the input interface of the high-speed data acquistion system (13) with a plurality of passages by signal wire (9), and high-speed data acquistion system (13) is connected with processor (14).
2. a kind of high-speed railway according to claim 1 draws net fault novel single-end travelling wave ranging system, it is characterized in that: described high voltage pulse generation device (11) output high-voltage pulse signal voltage magnitude 〉=27.5KV is limited in the high-voltage pulse signal width that produces in the 100ns; Travelling wave signal sensor (12) is the sensor of being made by Luo-coil; The highest proportion of single passage of described high-speed data acquistion system (13) reaches 100MHz.
3. a kind of high-speed railway according to claim 1 and 2 draws net fault novel single-end travelling wave ranging system, it is characterized in that: described high voltage pulse generation device (11) comprises high voltage direct current generator (2), impulse capacitor (3) and high voltage pulse switch (5), high voltage pulse switch (5) is spark switch, tripping operation after breaking down in high-speed railway traction netting twine road, high voltage direct current generator (2) is given impulse capacitor (3) charging, then by impulse capacitor (3) discharge and the high voltage pulse switch (5) through being attached thereto, repeatedly high-voltage pulse signal is sent on monitored high-speed railway traction netting twine road.
4. a kind of high-speed railway according to claim 1 and 2 draws net fault novel single-end travelling wave ranging system, it is characterized in that: described travelling wave signal sensor (12) adopts ambroin (6) parcel Luo-coil (7), Luo-coil (7) bottom is provided with high-tension porcelain insulator (8), and high-tension porcelain insulator (8) bottom is provided with signal wire (9) and grounding ports (10).
5. a kind of high-speed railway according to claim 1 and 2 draws net fault novel single-end travelling wave ranging system, it is characterized in that: described high-speed data acquistion system (13) arranges 4 passages, low-voltage and the little current signal of 4 groups of travelling wave signal sensors of synchronous acquisition (12) output, and record travelling wave signal wave head information.
6. a kind of high-speed railway according to claim 1 and 2 draws net fault novel single-end travelling wave ranging system, the control module that it is characterized in that described processor (14) is designed to: high-speed railway traction netting twine road tripping operation after high-speed railway traction net breaks down starts high voltage pulse generation device (11) repeatedly high-voltage pulse signal is sent on monitored high-speed railway traction netting twine road; Control travelling wave signal sensor (12) picks up the fault traveling wave electric current, starts high-speed data acquistion system (13) and monitors, and the assay surface that the signal that collects is reached processor (14) carries out waveform drawing, the localization of faults.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102707196A (en) * | 2012-06-08 | 2012-10-03 | 东华理工大学 | Novel single-ended travelling wave distance measuring system of fault of high-speed railway traction network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102707196A (en) * | 2012-06-08 | 2012-10-03 | 东华理工大学 | Novel single-ended travelling wave distance measuring system of fault of high-speed railway traction network |
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