CN105738766B - Contact net single-ended traveling wave fault positioning device - Google Patents
Contact net single-ended traveling wave fault positioning device Download PDFInfo
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- CN105738766B CN105738766B CN201610098527.1A CN201610098527A CN105738766B CN 105738766 B CN105738766 B CN 105738766B CN 201610098527 A CN201610098527 A CN 201610098527A CN 105738766 B CN105738766 B CN 105738766B
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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Abstract
The invention discloses a kind of contact net single-ended traveling wave fault positioning devices, are related to a kind of contact net fault location technology.The present apparatus is arranged contact net and accesses electric current, voltage and reflux full information data acquisition unit, event triggering fault message security unit, short trouble recognition unit, short trouble positioning unit and malfunction coefficient and alarm unit, the circuit access current transformer and voltage transformer being connected with contact net in Traction Station, pass through the temporal pattern of real-time detection and analysis electric current and voltage, it identifies fault type, and determines the place that failure occurs.The present invention is positioned for electrification railway contact net short trouble, has the characteristics that simple in structure, precision is high, small investment and reliability are high.
Description
Technical field
The present invention relates to a kind of contact network short circuit fault location technology more particularly to a kind of contact net single-ended traveling wave fault are fixed
Position device.
Background technology
In entire electric railway, contact net is responsible for directly feeds electric power machine the electric energy obtained from traction substation
The vital task that vehicle uses, contact net be the key that electric locomotive well by stream and safe operation, directly affect electrification iron
The transport in road.Contact net is chronically exposed to the open air of bad environments, and by the mechanical shock of electric locomotive pantograph, is easy to cause event
Barrier.If contact net breaks down, the short circuit current flowed through in short dot and neighbouring power equipment is likely to be breached rated current
Several times or even tens times, electrical equipment will be caused badly damaged, and railways train operation will be influenced, the weight of entire railway transportation can be caused
Big loss, once it is in contact net failure, it is difficult to abort situation is searched, it is just more tired in the case of night and bad weather
It is difficult.Positive value electric railway now is generally raised speed period, and train operation is quick and intensive, to ensure railway operation safety, to leading
Draw power supply system and propose new higher requirement, i.e., after failure generation, it is desirable that failure is fast and accurately discovered and ruled out,
It restores electricity in time as short as possible.Realization is accurately positioned fault point, can mitigate line walking burden, saves a large amount of manpower object
Power, and can debug rapidly and shorten the forced outage time, there is very important meaning to strong guarantee safe railway operation
Adopted and huge social benefit.
There are mainly two types of the short trouble localization methods generally used both at home and abroad at present：Impedance method and traveling wave method.Impedance method
The impedance in circuit of being out of order using the voltage, the Current calculation that are measured in route protection installation place when failure, so as to find out therefore
Hinder the position of point.But it is difficult the requirement for meeting the positioning of high-precision short trouble that this method, which is to a certain extent,.Traveling wave
Method short trouble positioning principle is simple, and using fault traveling wave, the velocity of wave of elapsed time difference and traveling wave can be realized on the line
The accurate short trouble positioning of transmission line of electricity.Error is not present in theory.Traveling wave method short trouble positioning at present is main
To use both-end localization method, but both-end positioning is needed in circuit both ends mounting and positioning device, a complete set of equipment not only expense compared with
Height accounts for much room, and is not easy to maintenance maintenance, and positioning accuracy also is difficult to reach requirement.
Invention content
The characteristics of present invention combination contact net, using single-ended traveling wave fault localization method, traveling wave method is optimized,
Disadvantages mentioned above and deficiency of the existing technology are overcome, equipment only need to be installed at one end, so that it may to complete determining for line fault
Position.It takes up space few, maintenance easy to repair improves equipment reliability of operation, accuracy, and position error is made to be no more than 30 meters.
The above-mentioned technical problem of the present invention is mainly to be addressed by following technical proposals：
A kind of contact net single-ended traveling wave short trouble positioning device, which is characterized in that including setting contact net access electric current,
Voltage and reflux full information data acquisition unit, event triggering fault message security unit, short trouble recognition unit, short circuit event
Hinder positioning unit and malfunction coefficient and alarm unit；
The input terminal that contact net accesses electric current, voltage and the full information data acquisition unit that flows back has 2 electric currents and 2 electricity
Pressing mold analog quantity detects incoming end, is separately connected the Current Transmit 1 and CT2, electricity of 2 circuits that Traction Station powers to contact net
Press the Current Transmit 3 of mutual inductor PT1 and PT2 and return wire；Output end connection event triggers fault message security unit
Input terminal；Event triggers the input terminal of fault message security unit output end access short trouble recognition unit；Short trouble
The input terminal of the output end connection short trouble positioning unit of recognition unit；The output end connecting fault of short trouble positioning unit
The input terminal of display and alarm unit；
It includes high-speed, high precision synchrodata that contact net, which is arranged, to access electric current, voltage and reflux full information data acquisition unit
Collecting unit, acquisition information memory cell, event of failure trigger element, data acquisition store and transmit control unit, complete to connect
It touches net and accesses electric current, voltage and the acquisition of reflux full information data, store and control function is transmitted in event of failure triggering；Data acquire
Unit high-speed, high precision synchronizes real-time data collection, and band markers cycle is stored in acquisition information memory cell, event of failure triggering
Unit carries out fault detect to sampled data, and when short trouble occurs, event of failure trigger element is with interrupt mode to control
When unit requests, control unit uploads fault message by communication interface；
Event trigger fault message security unit include industrial personal computer hard disk, with markers, contact line current, reflux line current and
Contact net voltage is that data directory stores classifiedly and read data；When event of failure trigger element sends out request transmission fault information
When, industrial personal computer stores and transmits control unit by the acquisition number of 10 power frequency periods before and after event triggering moment by data acquisition
Save list from damage according to event triggering fault message is transferred to from high-speed synchronous dual port static memory (SRAM) together with corresponding markers
Member is stored classifiedly and is freezed by data directory, in case fault locating analysis uses
Short trouble recognition unit includes industrial personal computer and short trouble identification module, when contact net short circuit, short circuit current
Much larger than maximum operating currenbt；Respectively with the maximum wink of Current Transmit 1 (or CT2) and the CT3 maximum load current detected
The average value of adjacent 5 data of duration is radix Ij1And Ij3, with the k of radix1And k2It is threshold values again, if the electric current of detection is more than k1
Base value Ij again1And k2Base value Ij again2When, then identify short trouble；k1And k2For fault current coefficient, generally higher than choose
2 times of maximum operating currenbt, maximum operating currenbt should be included in maximum of the same contact net with more locomotives while startup and open
Streaming current；
Short trouble positioning unit includes industrial personal computer and short trouble locating module, when short trouble recognition unit identifies
When short trouble, industrial personal computer will trigger in fault message security unit 2 from event and call related data, be positioned by short trouble
Software is analyzed and is calculated short trouble and point occurs apart from the distance between contact line current transformer installation point
Malfunction coefficient and alarm unit include display and buzzer, when short trouble positioning unit determines position of failure point
Afterwards, by the position of display visable representation fault point and Traction Station contact line access point between short circuit trouble point away from
From；When short trouble or low voltage failure occurs, buzzer starts buzzer, sends out alarm signal；Reset key can be passed through
Cancel malfunction coefficient and warning message.
In above-mentioned contact net single-ended traveling wave short trouble positioning device, contact net accesses electric current, voltage and the full letter of reflux
Cease data acquisition unit in, high-speed, high precision synchronous data collection unit by data acquisition and conditioning circuit, AD converter, synchronize and adopt
Sample holding circuit and microprocessor are constituted, and are completed from the full letter of electric current, voltage and reflux powered to contact net from Traction Station
Synchronous data collection function is ceased, the cooperation of sample rate, three kinds of AD conversion progress and operation frequency of microprocessor, which should meet, to be set
The requirement for counting short trouble positioning accuracy generally requires short trouble position error to be no more than 30 meters；
Acquisition information memory cell is made of high-speed synchronous dual port static memory, is read using loop-around data storage and twoport
WriteMode, single channel store data and are not less than 30M；
Event of failure trigger element is made of fault detection circuit, event trigger circuit and fault time mark unit, complete
At the function of finding failure, mark time of failure and ask transmission fault information to control unit with interrupt mode；
Fault detection circuit is made of comparator, by the short circuit of detection electric current and setting from Current Transformer Secondary side
Current setting is compared, and when detecting electric current more than short circuit current setting valve, comparator exports high level, at this time should indicate
There is short trouble in contact net；Short circuit current setting valve, which is generally chosen, is greater than or equal to fault current coefficient；
When short trouble occurs for contact net, contact net voltage will be remarkably decreased, this feature can be contacted with auxiliary judgment
Network short circuit fault；When contact net voltage is less than the 70% of rated voltage, start low voltage failure alarm；When contact net voltage is low
When the 50% of rated voltage, start short trouble alarm；
Event trigger circuit is made of electronic circuit, is inputted the output of connecting fault detection circuit, is worked as fault detection circuit
Output high level when, event trigger circuit export a pulse signal；
Fault time mark unit is made of big dipper multi-mode satellite time service system, when event trigger circuit exports a pulse
When signal, fault time mark unit obtains a precise time from big-dipper satellite time dissemination system, using the time-labeling failure
The markers at moment occurs；
Data acquisition store and transmit control unit by high-performance microprocessor and data acquisition store and transmit control it is soft
Part forms, and data acquisition stores and transmits control function；When event of failure trigger element with interrupt mode to control unit
When request, control unit uploads fault message by communication interface.
In above-mentioned contact net single-ended traveling wave short trouble positioning device, event triggers fault message security unit：
It is made of industrial personal computer hard disk, using markers, contact line current, reflux line current and contact net voltage as data directory point
Data are stored and read to class；When event of failure trigger element sends out request transmission fault information, industrial personal computer is acquired by data
Store and transmit control unit by the gathered data of 10 power frequency periods before and after event triggering moment and corresponding markers together from
High-speed synchronous dual port static memory is transferred to event triggering fault message security unit, stores classifiedly and freezes by data directory
Knot, in case fault locating analysis uses.
In above-mentioned contact net single-ended traveling wave short trouble positioning device, short trouble recognition unit, when contact net is short
Lu Shi, short circuit current are much larger than maximum operating currenbt；The peak load detected respectively with Current Transmit 1 or CT2 and CT3
The average value of adjacent 5 data of maximum instantaneous value of electric current is radix Ij1And Ij3, with the k of radix1And k2It is threshold values again, if inspection
The electric current of survey is more than k1Base value Ij again1And k2Base value Ij again2When, then identify short trouble；k1And k2For fault current system
Number, generally higher than choose maximum operating currenbt 2 times, it is same with more locomotives that maximum operating currenbt should be included in same contact net
The maximum starting current of Shi Qidong.
In above-mentioned contact net single-ended traveling wave short trouble positioning device, short trouble positioning unit, work as short trouble
When recognition unit identifies short trouble, industrial personal computer will trigger in fault message security unit from event and call related data, lead to
It crosses short-circuit fault location software analysis and calculates short trouble and point occurs between contact line current transformer installation point
Distance；
The algorithm of short trouble positioning software is to find contact line short-circuit current wave head and return wire short circuit event respectively
Hinder electric current wave head and it is corresponding at the time of t1And t2, velocity of wave v is calculated, calculating short trouble by formula one occurs point to traction
It stands to the distance between contact net access point l；
T in formula one1And t2Indicate that contact line short-circuit current wave head and return wire short-circuit current wave head reach respectively
At the time of contact line current transformer and return wire current transformer installation point；Δ l indicates Traction Station contact line current transformer
And return wire current transformer installation point is to the average value of distance sum between contact net and rail connection；
When the fault current wave head of return wire cannot be captured accurately, multiple contact line fault current wave heads may be used
Arrival time t1i, i=1,2,3 ..., n calculates short trouble generation point by formula two and arrives Traction Station to contact net access point
The distance between l；
T in formula two1iAt the time of indicating that i-th of wave head reaches contact line current transformer installation point, i=1,2,3 ..., n.
In above-mentioned contact net single-ended traveling wave short trouble positioning device, in malfunction coefficient and alarm unit, when short-circuit event
After barrier positioning unit determines position of failure point, accessed by the position of display visable representation fault point and Traction Station contact line
Point is the distance between to short circuit trouble point；When short trouble or low voltage failure occurs, buzzer starts buzzer, sends out report
Alert signal；And malfunction coefficient and warning message can be cancelled by reset key.
Therefore, the invention has the advantages that：1, single-ended：Without both ends installation FLU Fault Location Unit synchronous working；Failure
Positioning device work is not constrained by opposite end；It is not take up the remote communications resources of opposite end；Communication pressure can be reduced, fault location is improved
The operational reliability and ease for maintenance of equipment；2, high-precision：The acquisition of synchronous high-speed data, traveling wave are started using fault detection circuit
More return data records improve cluster Singularity Detection and the technologies such as intelligent algorithm and mass data processing progress failure
The intelligent recognition of feature, improves the precision and reliability of fault location, and intensifier anti-interference ability device improves high voltage power transmission
Line fault location precision makes fault location error be reduced to from 500 meters and 1000 meters of the fault location error of market existing product
15 meters or so；3, high reliability：One Traction Station need to only install 1 multichannel and integrate FLU Fault Location Unit, can reduce floor space
And equipment investment, realize the fault location of each circuit, and both-end positioning need to install more set of fault positioning devices；4, operation dimension
Shield is convenient：This fault locator is worked using non-maintaining automatic running mode, without human intervention, maintenance and maintenance workload
It is small.In a word.The present invention has the characteristics that simple in structure, precision is high, small investment and reliability are high.
Description of the drawings
Fig. 1 is contact net single-ended traveling wave fault positioning device structure block diagram；
Fig. 2 is that contact net accesses electric current, voltage and reflux full information data acquisition unit schematic diagram；
Fig. 3 is that event triggers fault message security unit, short trouble recognition unit, short trouble positioning unit and event
Barrier display and alarm unit fundamental diagram.
Specific implementation mode
Below with reference to the embodiments and with reference to the accompanying drawing the technical solutions of the present invention will be further described.In figure,.
Embodiment：
With reference to the accompanying drawings and examples, contact net single-ended traveling wave fault positioning device of the present invention is described in detail：
One, overall.
As shown in Figure 1, contact net single-ended traveling wave fault positioning device, which includes setting contact net, accesses electric current, voltage and reflux
Full information data acquisition unit 1, event triggering fault message security unit 2, short trouble recognition unit 3, short trouble positioning
Unit 4 and malfunction coefficient and alarm unit 5.
The input terminal that contact net accesses electric current, voltage and reflux full information data acquisition unit 1 has 2 electric currents and 2
Voltage analog detects incoming end, be separately connected 2 circuits that Traction Station power to contact net current transformer (CT1 with
CT2) and the current transformer (CT3) of voltage transformer (PT1 and PT2) and return wire, output end connection event trigger failure
The input terminal of information security unit 2；Event triggers the output end access short trouble recognition unit 3 of fault message security unit 2
Input terminal；The input terminal of the output end connection short trouble positioning unit 4 of short trouble recognition unit 3；Short trouble positions
The output end connecting fault of unit 4 is shown and the input terminal of alarm unit 5.
Two, major function block.
1, contact net access electric current, voltage and reflux full information data acquisition unit 1：It is adopted by high-speed, high precision synchrodata
Collection unit, acquisition information memory cell, event of failure trigger element, data acquisition store and transmit control unit composition, complete
Contact net accesses electric current, voltage and the acquisition of reflux full information data, storage and event of failure triggering transmission control function.Data are adopted
Collect unit high-speed, high precision and synchronize real-time data collection, band markers cycle is stored in acquisition information memory cell, and event of failure touches
Bill member carries out fault detect to sampled data, and when short trouble occurs, event of failure trigger element is with interrupt mode to control
When unit requests processed, control unit uploads fault message by communication interface.
2, event triggering fault message security unit 2：It is made of industrial personal computer hard disk, with markers, contact line current, return wire
Electric current and contact net voltage are that data directory stores classifiedly and read data.When event of failure trigger element sends out request transmission event
When hindering information, industrial personal computer stores and transmits control unit by 10 power frequency periods before and after event triggering moment by data acquisition
Gathered data and corresponding markers are transferred to event from high-speed synchronous dual port static memory (SRAM) together and trigger fault message
Security unit is stored classifiedly and is freezed by data directory, in case fault locating analysis uses.
3, short trouble recognition unit 3：It is made of industrial personal computer and short trouble identification software, it is short when contact net short circuit
Road electric current is much larger than maximum operating currenbt.Respectively with Current Transmit 1 (or CT2) and the CT3 maximum load current detected
The average value of adjacent 5 data of maximum instantaneous value is radix Ij1And Ij3, with the k of radix1And k2It is threshold values again, if the electricity of detection
Stream is more than k1Base value Ij again1And k2Base value Ij again2When, then identify short trouble.k1And k2For fault current coefficient, generally
More than 2 times of selection maximum operating currenbt, maximum operating currenbt should be included in same contact net with more locomotives while start
Maximum starting current.
4, short trouble positioning unit 4：It is made of industrial personal computer and short trouble positioning software, when short trouble recognition unit
3 when identifying short trouble, and industrial personal computer will trigger in fault message security unit 2 from event and call related data, pass through short circuit
Fault location software is analyzed and is calculated short trouble and point occurs apart from the distance between contact line current transformer installation point.
5, malfunction coefficient and alarm unit (5)：It is made of display and buzzer, when short trouble positioning unit (4) is true
After determining position of failure point, pass through the position of display visable representation fault point and Traction Station contact line access point to short trouble
The distance between point；When short trouble or low voltage failure occurs, buzzer starts buzzer, sends out alarm signal.It can be with
Cancel malfunction coefficient and warning message by reset key.
Three, example.
As shown in Fig. 2, a contact net access electric current, voltage and reflux full information data acquisition unit schematic diagram.
Contact net accesses electric current, voltage and reflux full information data acquisition unit 1：By high-speed, high precision synchronous data collection
Unit, acquisition information memory cell, event of failure trigger element, data acquisition store and transmit control unit composition.
High-speed, high precision synchronous data collection unit is independently led to by data acquisition and conditioning circuit, 16 bit A/D converters, 2 group 4
Road analog quantity synchronized sampling holding circuit and ARM7 microprocessors are constituted, and are completed from the electricity powered to contact net from Traction Station
Stream, voltage and reflux full information (transient state component and steady-state component) synchronous data collection function, sample rate, AD conversion into
The cooperation of three kinds of degree and operation frequency of microprocessor should meet the requirement of design short trouble positioning accuracy, general to require short circuit event
Hinder position error and is no more than 30 meters.
Acquisition information memory cell be made of high-speed synchronous dual port static memory (SRAM), using loop-around data storage with
Twoport read-write mode, single channel store data and are not less than 30M.
Event of failure trigger element is made of fault detection circuit, event trigger circuit and fault time mark unit, complete
At the function of finding failure, mark time of failure and ask transmission fault information to control unit with interrupt mode.
Fault detection circuit is made of comparator, by the short circuit of detection electric current and setting from Current Transformer Secondary side
Current setting is compared, and when detecting electric current more than short circuit current setting valve, comparator exports high level, at this time should indicate
There is short trouble in contact net.Short circuit current setting valve, which is generally chosen, is greater than or equal to fault current coefficient.
When short trouble occurs for contact net, contact net voltage will be remarkably decreased, this feature can be contacted with auxiliary judgment
Network short circuit fault.When contact net voltage is less than the 70% of rated voltage, start low voltage failure alarm.When contact net voltage is low
When the 50% of rated voltage, start short trouble alarm.
Event trigger circuit is made of electronic circuit, is inputted the output of connecting fault detection circuit, is worked as fault detection circuit
Output high level when, event trigger circuit export a pulse signal.
Fault time mark unit is made of big dipper multi-mode satellite time service system, when event trigger circuit exports a pulse
When signal, fault time mark unit obtains a precise time from big-dipper satellite time dissemination system, using the time-labeling failure
The markers at moment occurs.
Data acquisition store and transmit control unit by high-performance microprocessor and data acquisition store and transmit control it is soft
Part forms, and data acquisition stores and transmits control function.When event of failure trigger element with interrupt mode to control unit
When request, control unit uploads fault message by communication interface.
As shown in figure 3, event triggering fault message security unit, short trouble recognition unit, short trouble positioning unit
And malfunction coefficient and alarm unit fundamental diagram.
It is aobvious that event triggers fault message security unit, short trouble recognition unit, short trouble positioning unit and failure
Show that industrial personal computer, display, buzzer and application software system, which may be used, with alarm unit realizes, can also use high-performance micro-
Processor (such as：ARM9), display, buzzer and application software system are realized.
Event triggering fault message security unit 2 is made of industrial personal computer hard disk, with markers, contact line current, return wire electricity
Stream and contact net voltage are that data directory stores classifiedly and read data.When event of failure trigger element sends out request transmission fault
When information, industrial personal computer stores and transmits control unit by data acquisitions and adopts 10 power frequency periods before and after event triggering moment
Collection data and corresponding markers are transferred to event triggering fault message from high-speed synchronous dual port static memory (SRAM) together and protect
Full unit, is stored classifiedly and is freezed by data directory, in case fault locating analysis uses.
Short trouble recognition unit 3 is made of industrial personal computer and short trouble identification software, when contact net short circuit, short circuit electricity
Stream is much larger than maximum operating currenbt.Respectively with the maximum of Current Transmit 1 (or CT2) and the CT3 maximum load current detected
The average value of adjacent 5 data of instantaneous value is radix Ij1And Ij3, with the k of radix1And k2It is threshold values again, if the electric current of detection is big
In k1Base value Ij again1And k2Base value Ij again2When, then identify short trouble.k1And k2For fault current coefficient, generally higher than
Choose maximum operating currenbt 2 times, maximum operating currenbt should be included in same contact net with more locomotives while start most
Great start-up current.
Short trouble positioning unit 4 is made of industrial personal computer and short trouble positioning software, when short trouble recognition unit 3 is known
When not going out short trouble, industrial personal computer will trigger in fault message security unit 2 from event and call related data, pass through short trouble
Positioning software is analyzed and is calculated short trouble and point occurs apart from the distance between contact line current transformer installation point.
The algorithm of short trouble positioning software is to find contact line short-circuit current wave head and return wire short circuit event respectively
Hinder electric current wave head and it is corresponding at the time of t1And t2, velocity of wave v is calculated, calculating short trouble by formula (1) occurs point to traction
It stands to the distance between contact net access point l.
T in formula (1)1And t2Indicate that contact line short-circuit current wave head and return wire short-circuit current wave head arrive respectively
At the time of up to contact line current transformer and return wire current transformer installation point.Δ l indicates Traction Station contact line Current Mutual Inductance
The average value of device and return wire current transformer installation point to distance sum between contact net and rail connection.
When the fault current wave head of return wire cannot be captured accurately, multiple contact line fault current wave heads may be used
Arrival time t1i, i=1,2,3 ..., n calculates short trouble generation point by formula (2) and arrives Traction Station to contact net access point
The distance between l.
T in formula (2)1iAt the time of indicating that i-th wave head reaches contact line current transformer installation point, i=1,2,3 ...,
n.
Malfunction coefficient is made of with alarm unit 5 display and buzzer, when short trouble positioning unit 4 determines fault point
Behind position, by the position and Traction Station contact line access point of display visable representation fault point between short circuit trouble point
Distance；When short trouble or low voltage failure occurs, buzzer starts buzzer, sends out alarm signal.Reset can be passed through
Key cancels malfunction coefficient and warning message.
Specific embodiment described herein is only an example for the spirit of the invention.Technology belonging to the present invention is led
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (2)
1. a kind of contact net single-ended traveling wave short trouble positioning device, which is characterized in that access electric current, electricity including setting contact net
Pressure and reflux full information data acquisition unit (1), event triggering fault message security unit (2), short trouble recognition unit
(3), short trouble positioning unit (4) and malfunction coefficient and alarm unit (5)；
The input terminal that contact net accesses electric current, voltage and reflux full information data acquisition unit (1) has 2 electric currents and 2 electricity
Pressing mold analog quantity detects incoming end, is separately connected the Current Transmit 1 and CT2, electricity of 2 circuits that Traction Station powers to contact net
Press the Current Transmit 3 of mutual inductor PT1 and PT2 and return wire；Output end connection event triggers fault message security unit
(2) input terminal；Event triggers the input terminal of fault message security unit (2) output end access short trouble recognition unit (3)；
The input terminal of the output end connection short trouble positioning unit (4) of short trouble recognition unit (3)；Short trouble positioning unit
(4) output end connecting fault is shown and the input terminal of alarm unit (5)；
It includes high-speed, high precision synchrodata that contact net, which is arranged, to access electric current, voltage and reflux full information data acquisition unit (1)
Collecting unit, acquisition information memory cell, event of failure trigger element, data acquisition store and transmit control unit, complete to connect
It touches net and accesses electric current, voltage and the acquisition of reflux full information data, store and control function is transmitted in event of failure triggering；Data acquire
Unit high-speed, high precision synchronizes real-time data collection, and band markers cycle is stored in acquisition information memory cell, event of failure triggering
Unit carries out fault detect to sampled data, and when short trouble occurs, event of failure trigger element is with interrupt mode to control
When unit requests, control unit uploads fault message by communication interface；
Event trigger fault message security unit (2) include industrial personal computer hard disk, with markers, contact line current, reflux line current and
Contact net voltage is that data directory stores classifiedly and read data；When event of failure trigger element sends out request transmission fault information
When, industrial personal computer stores and transmits control unit by the acquisition number of 10 power frequency periods before and after event triggering moment by data acquisition
Save list from damage according to event triggering fault message is transferred to from high-speed synchronous dual port static memory (SRAM) together with corresponding markers
Member is stored classifiedly and is freezed by data directory, in case fault locating analysis uses；
Short trouble recognition unit (3) includes industrial personal computer and short trouble identification module, and when contact net short circuit, short circuit current is big
In maximum operating currenbt；Respectively with the maximum wink of Current Transmit 1 and CT3 or CT2 and the CT3 maximum load current detected
The average value of adjacent 5 data of duration is radix Ij1And Ij2, with the k of radix1And k2It is threshold values again, if the electric current of detection is more than k1
Base value Ij again1And k2Base value Ij again2When, then identify short trouble；k1And k2For fault current coefficient, it is more than and chooses maximum
2 times of operating current, maximum operating currenbt should be included in maximum startup electricity of the same contact net with more locomotives while startup
Stream；
Short trouble positioning unit (4) includes industrial personal computer and short trouble locating module, when short trouble recognition unit (3) identify
When going out short trouble, industrial personal computer will trigger from event and call related data in fault message security unit (2), pass through short trouble
Positioning software is analyzed and is calculated short trouble and point occurs apart from the distance between contact line current transformer installation point；
The algorithm of short trouble positioning software is to find contact line short-circuit current wave head and return wire short trouble electricity respectively
Flow wave head and it is corresponding at the time of t1And t2, velocity of wave v is calculated, calculating short trouble generation point by formula one arrives Traction Station extremely
The distance between contact net access point l；
T in formula one1And t2Indicate that contact line short-circuit current wave head and return wire short-circuit current wave head reach contact respectively
At the time of line current mutual inductor and return wire current transformer installation point；Δ l indicates Traction Station contact line current transformer and returns
Average value of the streamline current transformer installation point to distance sum between contact net and rail connection；
When the fault current wave head of return wire cannot be captured accurately, the arrival of multiple contact line fault current wave heads may be used
Time t1i, i=1,2,3 ..., n calculates short trouble by formula two and point occurs to Traction Station between contact net access point
Distance l；
T in formula two1iAt the time of indicating that i-th of wave head reaches contact line current transformer installation point, i=1,2,3 ..., n；
Malfunction coefficient and alarm unit (5) include display and buzzer, when short trouble positioning unit (4) determines failure point
Postpone, by the position of display visable representation fault point and Traction Station contact line access point between short circuit trouble point away from
From；When short trouble or low voltage failure occurs, buzzer starts buzzer, sends out alarm signal；Reset key can be passed through
Cancel malfunction coefficient and warning message.
2. contact net single-ended traveling wave short trouble positioning device according to claim 1, which is characterized in that contact net accesses
In electric current, voltage and reflux full information data acquisition unit (1), high-speed, high precision synchronous data collection unit is acquired by data and is adjusted
Manage circuit, AD converter, synchronized sampling holding circuit and microprocessor constitute, complete from powering to contact net from Traction Station
Electric current, voltage and reflux full information synchronous data collection function, sample rate, AD conversion progress and microprocessor work frequency
The cooperation of three kinds of rate should meet the requirement of design short trouble positioning accuracy, it is desirable that short trouble position error is no more than 30 meters；
Acquisition information memory cell is made of high-speed synchronous dual port static memory, using loop-around data storage and twoport read-write side
Formula, single channel store data and are not less than 30M；
Event of failure trigger element is made of fault detection circuit, event trigger circuit and fault time mark unit, completes hair
Existing failure, mark time of failure and the function of asking transmission fault information to control unit with interrupt mode；
Fault detection circuit is made of comparator, by the short circuit current of detection electric current and setting from Current Transformer Secondary side
Setting valve is compared, and when detecting electric current more than short circuit current setting valve, comparator exports high level, indicates the contact at this time
There is short trouble in net；Short circuit current setting valve, which is chosen, is greater than or equal to fault current coefficient；
When short trouble occurs for contact net, contact net voltage will be remarkably decreased, this feature can be short with auxiliary judgment contact net
Road failure；When contact net voltage is less than the 70% of rated voltage, start low voltage failure alarm；When contact net voltage is less than volume
Constant voltage 50% when, start short trouble alarm；
Event trigger circuit is made of electronic circuit, inputs the output of connecting fault detection circuit, defeated when fault detection circuit
When going out high level, event trigger circuit exports a pulse signal；
Fault time mark unit is made of big dipper multi-mode satellite time service system, when event trigger circuit exports a pulse signal
When, fault time mark unit obtains a precise time from big-dipper satellite time dissemination system, is occurred using the time-labeling failure
The markers at moment；
Data acquisition stores and transmits control unit and stores and transmits control software group by high-performance microprocessor and data acquisition
At data acquisition stores and transmits control function；When event of failure trigger element is asked with interrupt mode to control unit
When, control unit uploads fault message by communication interface.
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| CN201610098527.1A CN105738766B (en) | 2016-02-23 | 2016-02-23 | Contact net single-ended traveling wave fault positioning device |
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| CN105738766B true CN105738766B (en) | 2018-09-21 |
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| CN109444689B (en) * | 2018-11-19 | 2020-03-27 | 中国矿业大学 | Subway/coal mine backflow track insulation damage position and transition resistance monitoring method thereof |
| CN109782136B (en) * | 2018-12-27 | 2021-04-09 | 刘中生 | Method for determining defect position of contact net based on longitudinal wave and transverse wave speed difference |
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