CN202676856U - Traveling wave fault distance measuring device for power supply circuit - Google Patents
Traveling wave fault distance measuring device for power supply circuit Download PDFInfo
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- CN202676856U CN202676856U CN 201220314126 CN201220314126U CN202676856U CN 202676856 U CN202676856 U CN 202676856U CN 201220314126 CN201220314126 CN 201220314126 CN 201220314126 U CN201220314126 U CN 201220314126U CN 202676856 U CN202676856 U CN 202676856U
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- traveling wave
- wave signal
- signal data
- fault
- wave sensor
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Abstract
The utility model provides a traveling wave fault distance measuring device for a power supply circuit. The device includes a high voltage pulse generator, two traveling wave sensors, a traveling wave signal data collector, and a traveling wave signal data processor. The two traveling wave sensors are respectively connected into the same traveling wave signal data collector through transmission lines which are equal in length. The traveling wave signal data collector is connected with the traveling wave signal data processor, and the traveling wave signal data collector collects data and transmits the data to the traveling wave signal data processor. The traveling signal data processor obtains the accurate time taken for the traveling wave signal to reach to the two traveling wave sensors by processing the traveling wave signal. When a fault occurs in the circuit, the accurate positioning of a fault point can be realized through detecting the time taken for a fault transient state traveling wave signal generated by the circuit or the traveling wave signal generated by the high voltage pulse generator to the two traveling wave sensors, and the wave speed calculation is not required. The traveling wave fault distance measuring device has a simple structure and high measurement accuracy, and has no need of wave speed calculation.
Description
Technical field
The utility model relates to a kind of supply line traveling wave fault location device.
Background technology
At present supply line's fault distance-finding method of development comparative maturity mainly contains two kinds of impedance method and traveling wave methods.Compare with impedance method, traveling wave method is applied to the fault localization of electrified railway traction networks, the impact that its distance accuracy and stability are not caused by transition resistance and traction load characteristics etc.The multiple accidental error that this might eliminate in the range finding of traction net really obtains drawing the net localization of fault and stablizes and accurate conclusion.When utilizing traveling wave method to find range, need generally to determine simultaneously that travelling wave signal arrives time and the row wave-wave speed of travelling wave signal pick-up unit, could realize the accurate location for the trouble spot.Yet, the row ripple is along in the circuit communication process, the impact that row wave-wave speed can be subject to cable material, circuit distribution parameter, temperature, humidity, trouble spot contact resistance, construction of line situation etc. changes, and because row wave-wave speed is close to the light velocity, the change of row wave-wave speed also can produce larger impact to the range finding bearing accuracy, is not easy to the accurate location for line fault point.
Summary of the invention
The purpose of this utility model is exactly the defects that exists for existing supply line distance measuring equipment, propose a kind of simple in structure, accuracy of measurement is high, need not to determine supply line's traveling wave fault location device of velocity of wave.
Supply line of the present utility model traveling wave fault location device, comprise high-voltage pulse generator, two traveling wave sensors, travelling wave signal data acquisition unit and travelling wave signal data processor, two traveling wave sensors access in the same travelling wave signal data acquisition unit by the transmission line of equal length respectively, the travelling wave signal data acquisition unit links to each other with the travelling wave signal data processor, travelling wave signal data acquisition unit image data is sent into the travelling wave signal data processor, and the travelling wave signal data processor arrives the correct time of two traveling wave sensors by the processing of travelling wave signal being obtained travelling wave signal.
Supply line of the present utility model traveling wave fault location device, during use, high-voltage pulse generator and a traveling wave sensor are installed on supply line to be measured initiating terminal, and the another traveling wave sensor is installed in the supply line to be measured apart from initiating terminal one segment distance place.When line failure, the fault transient travelling wave signal that sends by detection line itself, the time of traveling wave sensor before and after the travelling wave signal that is perhaps sent by high-voltage pulse generator arrives, need not to calculate velocity of wave, can realize the accurate location for the trouble spot, especially when line fault occurs between two traveling wave sensors, the signal amplitude that detects by contrasting two traveling wave sensors can be realized simultaneously for the range finding location of trouble spot with to the judgement of line fault character.It has simple in structure, accuracy of measurement is high, need not to determine the characteristics of velocity of wave.
Description of drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the not range measurement principle figure between two traveling wave sensors of trouble spot of the present utility model.
Fig. 3 is the range measurement principle figure of trouble spot of the present utility model between two traveling wave sensors.
Embodiment
A kind of supply line traveling wave fault location device, comprise high-voltage pulse generator 1, front traveling wave sensor 3, rear traveling wave sensor 4, travelling wave signal data acquisition unit 5 and travelling wave signal data processor 6, front traveling wave sensor 3 and rear traveling wave sensor 4 access in the same travelling wave signal data acquisition unit 5 by the transmission line of equal length respectively, and travelling wave signal data acquisition unit 5 links to each other with travelling wave signal data processor 6.
As shown in Figure 2, when F point in the supply line 2 is short-circuited or during open circuit fault, trouble spot F is positioned at rear traveling wave sensor 4 rear ends, when fault occurs, F point place produces the transient state travelling wave signal, travelling wave signal is propagated to the circuit two ends, the signal of propagating toward circuit initiating terminal M is successively through traveling wave sensor 4 later, front traveling wave sensor 3 arrives circuit initiating terminal M, first reflection occurs at the M end, the first reflection travelling wave signal passes through front traveling wave sensor 3 successively, rear traveling wave sensor 4 arrives trouble spot F, for the second time reflection occurs at F point place, and the travelling wave signal of reflection is successively through traveling wave sensor 4 later for the second time, front traveling wave sensor 3 returns fault initiating terminal M.The travelling wave signal data that front traveling wave sensor 3 and rear traveling wave sensor 4 are detected are through travelling wave signal data acquisition unit 5 line of input ripple Signal Data Processors 6, the time t at traveling wave sensor 3 places before can getting after treatment the first reflection travelling wave signal and arriving
1, the time t at traveling wave sensor 4 places after arriving
2, for the second time the reflected traveling wave signal to after reach the time t of traveling wave sensor 4
3, the time t of traveling wave sensor 3 before the fault reflected traveling wave arrives
4, establishing the circuit velocity of wave is v.
The distance that then can get the rear traveling wave sensor 4 of trouble spot F distance is: S
1=((t
3-t
2) v)/2;
The distance that can get the front traveling wave sensor 3 of trouble spot F distance is: S
2=((t
4-t
1) v)/2;
Because the distance between front traveling wave sensor 3 and the rear traveling wave sensor 4 is known, is d, then S
2-S
1=d;
Simultaneous solution Shi Kede: S
2=((t
4-t
1)/(t
4+ t
2-t
1-t
3)) d;
S
2Be trouble spot F apart from the distance of circuit initiating terminal.
After finishing above-mentioned steps, after starting high-voltage pulse generator 1 and initiatively supply line being sent travelling wave signal, initial travelling wave signal along circuit toward trouble spot F end propagate, travelling wave signal through front traveling wave sensor 3 with after arrive F place, trouble spot behind the traveling wave sensor 4.Because smaller apart from the d setting between front traveling wave sensor 3 and the rear traveling wave sensor 4, the row ripple is uploaded the sowing time energy loss at the non-fault circuit and can be ignored, therefore, front traveling wave sensor 3 should be without significant difference with the travelling wave signal amplitude that rear traveling wave sensor 4 detects.When travelling wave signal advances to F place, trouble spot, because the impedance discontinuity of F place line end, the F meeting of end produces fault reflected traveling wave signal, and fault reflected traveling wave signal is transmission along supply line toward the circuit starting point, and traveling wave sensor 4 arrives the circuit initiating terminals with front traveling wave sensor 3 after the warp successively.The travelling wave signal data that front traveling wave sensor 3 and rear traveling wave sensor 4 detect can get the time t that the initial row ripple arrives front traveling wave sensor 3 places after treatment through travelling wave signal data acquisition unit 5 line of input ripple Signal Data Processors 6
5, the time t at traveling wave sensor 4 places after arriving
6, the time t of traveling wave sensor 4 after the fault reflected traveling wave arrives
7, the time t of traveling wave sensor 3 before the fault reflected traveling wave arrives
8, establishing the circuit velocity of wave is v.
The distance that then can get the rear traveling wave sensor 4 of trouble spot F distance is: S
1=((t
7-t
6) v)/2;
The distance that can get the front traveling wave sensor 3 of trouble spot F distance is: S
2=((t
8-t
5) v)/2;
Because the distance between front traveling wave sensor 3 and the rear traveling wave sensor 4 is known, is d, then S
2-S
1=d;
Simultaneous solution Shi Kede: S
2=((t
8-t
5)/(t
8+ t
6-t
5-t
7)) d;
S
2Be trouble spot F apart from the distance of circuit initiating terminal.
From the above mentioned, location for trouble spot F can be realized by above dual mode, occur in the situation of deviation in the transient state travelling wave input that produces for supply line self, can start high-voltage pulse generator and initiatively send pulse signal, take multiple measurements, to obtain to find range accurately the result.Simultaneously,, can be analyzed for the range finding result of dual mode, to improve accuracy and the bearing accuracy for localization of fault all in the attainable situation at dual mode.
As shown in Figure 3, be short-circuited or during open circuit fault, trouble spot F is between front traveling wave sensor 3 and rear traveling wave sensor 4 as 2 certain 1 F of supply line.When fault occurs, the F end can produce the transient state travelling wave signal of propagating toward the circuit two ends, the transient state travelling wave signal of propagating toward M end arrives (traveling wave sensor 3 places namely) generation first reflection behind the circuit initiating terminal M, the capable ripple of first reflection arrives trouble spot F through front traveling wave sensor 3, for the second time reflection occurs at F point place, hold the transient state travelling wave signal of propagating to arrive for the first time rear traveling wave sensor 4 follow-up continuing toward N and enter line end N point place, first reflection occurs at N point place.The travelling wave signal data that front traveling wave sensor 3 and rear traveling wave sensor 4 are detected can get the time t that transient state travelling wave arrives front traveling wave sensor 3 places for the first time after treatment through travelling wave signal data acquisition unit 5 line of input ripple Signal Data Processors 6
9, the time t at traveling wave sensor 3 places before reflected traveling wave arrives for the second time
10, transient state travelling wave arrives the time t of rear traveling wave sensor 4 for the first time
11If the distance of the front traveling wave sensor 3 of F point distance is S
2, the distance of the rear traveling wave sensor 4 of F point distance is S
1, row wave-wave speed is v, then:
(t
11-t
9)·v=S
1-S
2 ；
(t
10-t
9)·v=S
2 ；
Because the distance between front traveling wave sensor 3 and the rear traveling wave sensor 4 is known, is made as d, i.e. S
1+ S
2=d;
Simultaneous solution Shi Kede: S
2=((t
10-t
9)/(2t
10+ t
11-3t
9)) d;
S
2Be trouble spot F apart from the distance of circuit initiating terminal.
After finishing above-mentioned steps, start 1 pair of supply line of high-voltage pulse generator and send travelling wave signal, under short circuit or open circuit fault condition, when travelling wave signal is passed through F place, trouble spot, travelling wave signal can not see through the F point and be transferred to rear traveling wave sensor 4 places, can produce fault reflected traveling wave signal at the F point, propagates along supply line toward the circuit initiating terminal, the fault reflected traveling wave can arrive front traveling wave sensor 3, thereby is detected by front traveling wave sensor 3.In addition, if trouble spot F is between front traveling wave sensor 3 and rear traveling wave sensor 4, and F place in trouble spot exists partial breakdown or other transient faults, because the uncontinuity of F point place's impedance, travelling wave signal can reflect at some energy of F point place, visible decay can occur in the travelling wave signal amplitude that rear traveling wave sensor 4 monitors, and accordingly, can judge to have partial breakdown or other transient faults between front traveling wave sensor 3 and the rear traveling wave sensor 4.For above two kinds of situations, by the distance between front traveling wave sensor 3 and the rear traveling wave sensor 4 is set, as arrange apart from d to be 30 meters, then to need not accurately to catch wavefront, can be positioned at from 30 meters certain some places of starting point by the failure judgement point, be about to range error and be controlled in 30 meters.
Claims (2)
1. supply line's traveling wave fault location device, comprise high-voltage pulse generator, two traveling wave sensors, travelling wave signal data acquisition unit and travelling wave signal data processors, it is characterized in that: two traveling wave sensors access in the same travelling wave signal data acquisition unit by the transmission line of equal length respectively, and the travelling wave signal data acquisition unit links to each other with the travelling wave signal data processor.
2. supply line according to claim 1 traveling wave fault location device, it is characterized in that: high-voltage pulse generator and a traveling wave sensor are installed on supply line to be measured initiating terminal, and the another traveling wave sensor is installed in the supply line to be measured apart from initiating terminal one segment distance place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220314126 CN202676856U (en) | 2012-07-02 | 2012-07-02 | Traveling wave fault distance measuring device for power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220314126 CN202676856U (en) | 2012-07-02 | 2012-07-02 | Traveling wave fault distance measuring device for power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202676856U true CN202676856U (en) | 2013-01-16 |
Family
ID=47497753
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220314126 Expired - Fee Related CN202676856U (en) | 2012-07-02 | 2012-07-02 | Traveling wave fault distance measuring device for power supply circuit |
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|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901324A (en) * | 2014-04-14 | 2014-07-02 | 国家电网公司 | Method for hybrid circuit combined distance measurement of power distribution network based on single-ended fault information |
-
2012
- 2012-07-02 CN CN 201220314126 patent/CN202676856U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103901324A (en) * | 2014-04-14 | 2014-07-02 | 国家电网公司 | Method for hybrid circuit combined distance measurement of power distribution network based on single-ended fault information |
| CN103901324B (en) * | 2014-04-14 | 2016-09-21 | 国家电网公司 | A kind of power distribution network joint line combination type distance-finding method based on one-end fault information |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20130702 |