CN102707190B - Direct-current-side short-circuit fault distance measuring device and method of metro tractive power supply system - Google Patents

Direct-current-side short-circuit fault distance measuring device and method of metro tractive power supply system Download PDF

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CN102707190B
CN102707190B CN201210004742.2A CN201210004742A CN102707190B CN 102707190 B CN102707190 B CN 102707190B CN 201210004742 A CN201210004742 A CN 201210004742A CN 102707190 B CN102707190 B CN 102707190B
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contact net
branch road
electric current
voltage
track branch
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CN201210004742.2A
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CN102707190A (en
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马金芳
于龙
闫祖顺
池代臻
周文卫
马婷
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成都唐源电气有限责任公司
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Abstract

The invention discloses a direct-current-side short-circuit fault distance measuring device and a method of a metro tractive power supply system, relates to the field of distance measurement of faults of a power supply system, and aims to provide the direct-current-side short-circuit fault distance measuring device and the method of the tractive power supply system which are suitable for a railway, particularly a metro. The short-circuit fault distance measuring device of the metro tractive power supply system disclosed by the invention comprises an upper computer; two or more than two two-side feeding traction substations are respectively provided with shunts, four current sampling units, one voltage sampling unit, an AD (Analogue/Digital) converter group, a control processing unit, a GPS (Global Position System) time service unit and a wireless signal sending unit; the short-circuit fault distance measuring method of the metro tractive power supply system comprises the following steps that: each substation simultaneously collects current and voltage of upper and lower rows of contact nets at two sides; whether a short-circuit fault occurs or not is judged according to the size of the current; current and voltage signals are wirelessly transmitted to the upper computer when the short-circuit fault occurs; and the upper computer further calculates the position of the short-circuit fault according to the received current and voltage signals.

Description

Metro traction power system dc-side short-circuit fault distance measuring equipment and method

Technical field

The present invention relates to electric power system fault range finding field, the particularly fault localization of Feeding System of Urban Rail Transit dc-side short-circuit.

Background technology

Railway contact line has many electric motor car groups dynamically to get at a high speed stream along the line, make that contact net is around-the-clock to be in vibration, friction, electric arc, flexible dynamic state of run, the probability of the more general power circuit of possibility of the fault that is short-circuited between contact net and walking rail is much bigger.After subway power-transmission line failure, need to judge as early as possible abort situation, fix a breakdown, recover in time subway normal power supply.

Transmission line malfunction is divided into transient fault and permanent fault.Transient fault is the fault type that can restore electricity by reclosing, but trouble spot thin spot often, and these thin spots need to find as early as possible and be processed, in order to avoid secondary failure or develop into permanent fault.When permanent fault, reclosing is unsuccessful, and electric system is stopped power supply, and now must find out fast fault and be got rid of, and ensures the normal operation of subway movement plan.

In metro traction power system, on a subway line, be generally distributed with more than 10 traction substation and stepdown substation, Rectification Power Factor in each traction substation changes the alternating current of 35Kv or 33Kv in the direct current of 1500V, and Rectification Power Factor is drawn 4 power supply branch roads and is respectively the up contact net on underground railway track both sides, the power supply of descending contact net.

The power supply the principle figure of metro traction power system between the Shi Liangge electric substation that Fig. 1 shows, each electric substation Rectification Power Factor is drawn 4 power supply branch roads 701,702,703,704, wherein the branch road 701 in electric substation 1 is the up contact net power supply in this section, and branch road 702 is the descending contact net power supply in this section; Branch road 703 in electric substation 2 is the up contact net power supply in this section, and 704 is the descending contact net power supply in this section.

Descending contact net and descending rail that F point in figure is illustrated in this place's section are short-circuited.

Subway feeder fault locating device, can realize the accurate location of trouble spot, can alleviate the line walking burden of subway power supply maintenance department; Can effectively find the potential safety hazard that fault causes, take corresponding measure to improve the reliability of subway transport; Fix a breakdown rapidly, shorten power off time, reduce the loss causing due to power failure.Subway feeder fault locating is not only conducive to find in time and fix a breakdown, and ensures the normal work of traction net, and is all very important for safe, the reliable and economical operation of subway system, has huge society and economical synthesis benefit.

In prior art, in electric system, conventional fault distance-finding method is mainly impedance method and traveling wave method.

Voltage, the magnitude of current that impedance method measures during according to fault calculate fault distance, suppose that line length and impedance are directly proportional, thereby obtain the distance of fault location device to trouble spot.

Traveling wave method carries out fault localization according to traveling wave theory, can be divided into Single Terminal Traveling Wave Fault Location and both-end travelling wave ranging.When Single Terminal Traveling Wave Fault Location, in the time that transmission line of electricity breaks down, the row ripple of propagating from bus to trouble spot, after after a while, reflects from trouble spot again, the time interval is directly proportional to fault distance, can carry out fault localization by detecting this time interval.The row ripple that both-end Algorithms of Travelling Wave Based Fault Location utilizes trouble spot to produce arrives the mistiming realization range finding at two ends for the first time.Traveling wave method fault localization is not subject to the impact of circuit types, transition resistance, both sides system impedance in theory, but higher to hardware requirement, and sample rate is fast, and storage and analysis to mass data proposed high requirement.

But the conventional impedance method of electric system and traveling wave method in subway, directly application difficulty is very large, impedance method is to utilize the power frequency component of electric parameters to carry out fault localization conventionally, and in electric power supply system for subway, uses direct current supply; And row ripple is propagated with the speed that approaches the light velocity conventionally, Fault Location With Traveling Wave is more suitable for the fault localization of voltage levels, long distance line, but subway power supply arm only has several kilometers, rated voltage 1500V, and application traveling wave method is nonsensical.

Summary of the invention

The object of this invention is to provide especially metro traction power system short trouble distance measuring equipment and the method for railway that be applicable to.

The technical solution used in the present invention is such: a kind of metro traction power system dc-side short-circuit fault distance measuring equipment, comprise host computer, be respectively arranged with at the traction substation of two or more two-side feedings: shunt, 4 current sampling units, 1 voltage sample unit, AD converter group, controlled processing unit, time service unit, wireless signal transmitting element;

Of living in each power transformation: in 4 current sampling units, have 2 current sampling units to gather respectively up contact net electric current and the descending contact net electric current of the A of this electric substation limit track branch road by shunt, other 2 current sampling units gather respectively the up contact net electric current of the B of this electric substation limit track branch road and descending contact net electric current by shunt;

Described voltage sample unit gathers the up contact net voltage of the A of this electric substation limit track branch road or the descending contact net voltage of A limit track branch road or the up contact net voltage of B limit track branch road or the descending contact net voltage of B limit track branch road;

AD converter group has 5 independently AD converter, and in each AD converter, has a startup control end; The output terminal of described 4 current sampling units and 1 voltage sample unit is connected respectively the input end of 5 independent AD converter in described AD converter group; In AD converter group, the output terminal of 5 AD converter all has signal with controlled processing unit and is connected, and in AD converter group, the startup control end of 5 AD converter also all has signal with controlled processing unit and is connected; Controlled processing unit has signal to be connected with time service unit, receives the temporal information of time service unit output; Controlled processing unit has signal with wireless signal transmitting element and is connected, and wireless signal transmitting element is for receiving electric current, the voltage signal of controlled processing unit output and radioing to described host computer;

Described host computer calculates for up contact net electric current, voltage signal or the descending contact net electric current, the voltage signal that receive each the track branch road that each electric substation sends by wireless mode the position that short trouble occurs.

Preferably, described controlled processing unit is FPGA, and described FPGA is connected with time service unit, receives time mark information and the pulse per second (PPS) of the output of time service unit; FPGA has counter and storer, and pulse per second (PPS) is used for starting rolling counters forward, and storer is for flag information storage time.

Preferably, described host computer quantity is at least 1, and every host computer is communicated by letter with the controlled processing unit of at least 2 electric substations.

A kind of metro traction power system dc-side short-circuit fault distance-finding method, comprises the following steps:

Step 401: up contact net electric current and descending contact net electric current and the up contact net electric current of B limit track branch road and the descending contact net electric current of its A limit track branch road when each electric substation timing acquiring synchronization; Meanwhile, each electric substation gathers the up contact net voltage of A limit track branch road or descending contact net voltage or the up contact net voltage of B limit track branch road or the descending contact net voltage of B limit track branch road of A limit track branch road;

Step 402: each electric substation judges whether the electric current of the electric current of the descending contact net of its A limit, B limit track branch road, up contact net is greater than setting threshold and is greater than the time interval that holding time of setting threshold is greater than setting;

Step 403: be greater than setting threshold and be greater than holding time of setting threshold while being greater than the time interval of setting when electric substation judges in the electric current of descending contact net of its A limit track branch road or the electric current of the electric current of the up contact net of A limit track branch road or the descending contact net of B limit track branch road or the up contact net electric current of B limit track branch road at least one, this current anomaly is thought by electric substation; Do abnormal electric current and voltage data corresponding to described abnormal current of described power transformation adds after get on the right track branch road contact net feeder line mark and acquisition time mark by wireless way for transmitting to host computer;

Step 404: host computer calculates according to electric current, voltage signal that on same contact net on same track branch road, two ends electric substation is transmitted the position that short trouble occurs.

Preferably, in step 404, host computer utilizes difference equation

Calculate the position that fault occurs; Wherein, , voltage, the electric current of the location of short circuit place track branch road contact net of location of short circuit one end electric substation transmission while being respectively short trouble generation, , voltage, the electric current of the location of short circuit place track branch road contact net of location of short circuit other end electric substation transmission while generation for short trouble, , , for the equivalent resistance of contact net between Liang Ge electric substation, for rail equivalent resistance, for contact net equivalent inductance, for rail equivalent inductance.

Preferably, in described step 401, each electric substation adopts 4 current sampling units to gather respectively respectively the electric current of descending contact net and the electric current of up contact net of the electric current of descending contact net of the described A of electric substation limit track branch road and the electric current of up contact net, B limit track branch road by shunt;

Adopt 1 voltage sample unit to gather the voltage of descending contact net of the described A of electric substation limit track branch road or the voltage of the voltage of the up contact net of A limit track branch road or the voltage of the descending contact net of B limit track branch road or the up contact net of B limit track branch road;

Recycling 5 independently has the AD converter that starts control end the signal of described 4 current sampling units and the output of described voltage sample unit is carried out to AD conversion; 5 independently the output of AD converter be connected to FPGA, FPGA also all has signal to be connected with startup control end, time service unit, the wireless signal transmitting element of described AD converter;

Time service unit is to FPGA output time flag information and pulse per second (PPS), and FPGA starts counting after receiving pulse per second (PPS), starts 5 AD converter samplings in the time that counting reaches default sampling interval simultaneously; FPGA storage simultaneously starts AD converter and starts the time marking while sampling.

Preferably, in described step 402, the FPGA in each electric substation judges whether the electric current of the electric current of the descending contact net of its A of place electric substation limit, B limit track branch road, up contact net is greater than setting threshold and is greater than the time interval that holding time of setting threshold is greater than setting.

Preferably, in described step 403, described FPGA is greater than the electric current in the time interval of setting and corresponding voltage signal thereof and adds and get on the right track after branch road contact net feeder line mark and sampling time mark being greater than setting threshold and being greater than holding time of setting threshold, exports to host computer by wireless signal transmitting element.

In sum, owing to having adopted technique scheme, the invention has the beneficial effects as follows:

1, short trouble distance measuring equipment disclosed by the invention and method have advantages of that precision is high.

2, the short trouble distance measuring equipment in the present invention and method have realized short trouble range finding robotization, can find rapidly the position that fault occurs.

3, short trouble distance-finding method disclosed by the invention is without the equivalent resistance of measuring uplink and downlink contact net, uplink and downlink rail, only need measure short trouble generation time, upper contact net electric current, voltage and descending contact net electric current, the voltage of location of short circuit two ends electric substation can calculate the position that fault occurs, and have greatly simplified the fault distance that opens circuit and have measured operation.

Brief description of the drawings

Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:

Fig. 1 is the power supply the principle schematic diagram of metro traction power system between prior art Zhong Liangge electric substation.

Fig. 2 is the schematic diagram of short circuit fault location device installation site in electric power system in the present invention.

Fig. 3 is short circuit fault location device theory diagram in the present invention.

The short trouble transient state equivalent circuit diagram of Fig. 4 both end power supplying.

Fig. 5 is the circuit diagram process shown in Fig. 4 circuit diagram after conversion.

Fig. 6 is the typical current waveform figure of contact net feeder line end after short trouble occurs.

Embodiment

Disclosed all features in this instructions, or step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.

Disclosed arbitrary feature in this instructions (comprising any accessory claim, summary and accompanying drawing), unless narration especially all can be replaced by other equivalences or the alternative features with similar object.,, unless narration especially, each feature is an example in a series of equivalences or similar characteristics.

As Fig. 2, on subway is along the line, be provided with host computer, each transformer station is provided with: shunt, 4 current sampling units, 1 voltage sample unit, AD converter group, controlled processing unit, time service unit, wireless signal transmitting element.Each transformer station in figure is two-side feeding, in order to remove statement, in literary composition by track branch road called after A limit track branch road and the B limit track branch road on transformer station both sides.

In 4 current sampling units, have 2 current sampling units to gather respectively up contact net electric current and the descending contact net electric current of the A of this electric substation limit track branch road by shunt, other 2 current sampling units gather respectively the up contact net electric current of the B of this electric substation limit track branch road and descending contact net electric current by shunt.

The up contact net voltage of the A of this electric substation limit track branch road and descending contact net voltage, the up contact net voltage of B limit track branch road and descending contact net voltage are identical, described voltage sample unit gathers the voltage at any place in the descending contact net voltage of up contact net voltage, the descending contact net voltage of A limit track branch road, the up contact net voltage of B limit track branch road and B limit track branch road of the A of this electric substation limit track branch road, more particularly gathers in electric substation the voltage between anodal busbar and cathode bus bar in both positive and negative polarity cabinet.

AD converter group has 5 independently AD converter, and in each AD converter, has a startup control end; The output terminal of described 4 current sampling units and voltage sample unit is connected respectively the input end of 5 independent AD converter in described AD converter group; In AD converter group, the output terminal of 5 AD converter all has signal with controlled processing unit and is connected, and in AD converter group, the startup control end of 5 AD converter also all has signal with controlled processing unit and is connected; Controlled processing unit has signal to be connected with time service unit, receives the temporal information of time service unit output; Controlled processing unit has signal with wireless signal transmitting element and is connected, and wireless signal transmitting element is for receiving electric current, the voltage signal of controlled processing unit output and radioing to described host computer.

Described host computer calculates for up contact net electric current, voltage signal or the descending contact net electric current, the voltage signal that receive each the track branch road that each electric substation sends by wireless mode the position that short trouble occurs.

Wherein, current sampling unit is current transducer specifically, and voltage sample unit is voltage transmitter.Specifically atomic clock of time service unit.Controlled processing unit is FPGA specifically.

In FPGA, there is counter and storer.FPGA is connected with time service unit by serial ports, receives the time marking of time service unit output.The counter input end of FPGA is also connected with the pulse per second (PPS) output terminal of time service unit.Counter is receiving that after pulse per second (PPS), beginning is counted according to the clock of FPGA inside, in the time counting down to default sampling time interval, FPGA starts sampled signal to the output of AD converter group, 5 AD converter in AD converter group gather voltage, the current value of current time, and FPGA stores the time marking of current time simultaneously.

Short trouble distance-finding method based on above-mentioned metro traction power system short trouble range finding comprises:

Step 1: the electric current of descending contact net and the electric current of up contact net of its A limit, B limit track branch road when each electric substation timing acquiring synchronization; Meanwhile, each electric substation gathers the up contact net voltage of A limit track branch road or descending contact net voltage or the up contact net voltage of B limit track branch road or the descending contact net voltage of B limit track branch road of A limit track branch road; Because the descending contact net voltage of the up contact net voltage of A limit track branch road, A limit track branch road, the up contact net voltage of B limit track branch road, the person B limit descending contact net voltage of track branch road all equate, gather any one in these 4 voltages;

Step 2: each electric substation judges whether the electric current of the electric current of the descending contact net of its A limit, B limit track branch road, up contact net is greater than setting threshold and is greater than the time interval that holding time of setting threshold is greater than setting;

Step 3: be greater than setting threshold and be greater than holding time of setting threshold while being greater than the time interval of setting when electric substation judges in the electric current of descending contact net of its A limit track branch road or the electric current of the electric current of the up contact net of A limit track branch road or the descending contact net of B limit track branch road or the up contact net electric current of B limit track branch road at least one, this current anomaly is thought by electric substation; Do abnormal electric current and voltage data corresponding to described abnormal current of described power transformation adds after get on the right track branch road contact net mark and acquisition time mark by wireless way for transmitting to host computer;

Step 4: host computer calculates according to electric current, voltage signal that on same contact net on same track branch road, two ends electric substation is transmitted the position that short trouble occurs.

Concrete, in step 1, controlled processing unit is FPGA, FPGA receives time marking and the pulse per second (PPS) of time service unit, FPGA starts counting after receiving described pulse per second (PPS), and in the time counting down to the sampling interval of setting, the FPGA of each transformer station starts AD converter group, gather its A of current time, the current/voltage of B limit up-downgoing contact net, FPGA records the time marking of current time simultaneously.

In step 2, the FPGA in each electric substation judges whether the electric current of the electric current of the descending contact net of its A of place electric substation limit, B limit track branch road, up contact net is greater than setting threshold and is greater than the time interval that holding time of setting threshold is greater than setting.This is that short-circuit current rate of change is very large because short trouble is while occurring, and current value sharply rises, and after circuit breaker trip, and electric current starts to decline, by failure removal.From the angle of current amplitude, it is large that amplitude of short circuit is got stream (get stream and refer to that electric locomotive obtains electric current by the pantograph of roof from contact net) than normal hauling engine conventionally.

But while startup for far-end short trouble and hauling engine, get stream, be only difficult to judgement from the angle of current amplitude, need to adopt another specific process to judge.Conventionally short trouble occur to circuit breaker trip, whole time course is generally in 100ms, and the large electric current that hauling engine starts, it was held time as the several seconds.

Comprehensive these two factors, the duration that can exceed a certain threshold values according to the short-circuit current before and after protective relaying device tripping operation carries out short trouble and judges in advance.Fig. 6 is the typical current waveform figure of contact net feeder line end at short trouble place after short trouble occurs.

In step 3, FPGA is greater than the electric current in the time interval of setting and corresponding voltage signal thereof and adds and get on the right track after branch road contact net mark and sampling time mark being greater than setting threshold and being greater than holding time of setting threshold, exports to host computer by wireless signal transmitting element.Be not difficult to learn, electric current, the voltage that the electric substation in short trouble occurrence positions two ends sends has identical track branch road contact net mark and sampling time mark.

In step 4, host computer has received generation that each transformer station transmits electric current, the voltage of track branch road contact net of short trouble, filters out track branch road contact net mark and sampling time to identify identical electric current, voltage, utilizes difference equation

Calculate the position that fault occurs; Wherein, , voltage, the electric current of the location of short circuit place track branch road contact net of location of short circuit one end electric substation transmission while being respectively short trouble generation, , voltage, the electric current of location of short circuit other end electric substation transmission location of short circuit place track branch road contact net while generation for short trouble, , , for contact net equivalent resistance, for walking net equivalent resistance, for contact net equivalent inductance, for walking net equivalent inductance, the wherein distance of one end electric substation and the ratio of whole piece track branch road contact net length of location of short circuit distance.

Further set forth the derivation of above-mentioned difference equation below: Fig. 5 is the short trouble transient state equivalent circuit diagram of both end power supplying.In figure, the resistance of the up contact net total length of a section, the inductance of the up contact net total length of a section, the resistance that the interior descending contact net of m side rectifier distance is arrived in trouble spot, that the descending contact net inductance in m side rectifier distance is arrived in trouble spot, that the descending contact net resistance in n side rectifier distance is arrived in trouble spot, that the descending contact net inductance in n side rectifier distance is arrived in trouble spot, the transition resistance of short dot, the rail resistance of m side rectifier to trouble spot place, the rail inductance of m side rectifier to trouble spot place, the rail resistance of n side rectifier to trouble spot place, the rail inductance of n side rectifier to trouble spot place. rail all-in resistance in a section, it is a rail total inductance in section.Fig. 6 is the circuit diagram process shown in Fig. 5 circuit diagram after conversion.

In Fig. 6, the differential equation that any time of short trouble is satisfied:

In formula, electric parameter is as follows:

Consider the size of resistance and inductance and be directly proportional apart from length, in above formula:

Order , , due to ratio a low order of magnitude, condition under, any time of short trouble all meets the following differential equation:

Its corresponding difference equation is:

While solving this difference equation, will , , , all regard unknown number as.The time of origin of considering short trouble is about 50ms, and the sampling period of associated voltage electric current is 0.1ms, be that available data point is about 500, this is data redundancy for above-mentioned difference equation, be that equation number is more than unknown parameter, for this problem, can use least square method to solve more accurate , , , numerical solution.Obtain , after, the two is divided by and is just obtained value, further obtain , the position of finding short trouble to occur.As for , specifically how many, solve difference equation and be indifferent to, greatly simplify the operation of measuring fault occurrence positions.

The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination disclosing in this manual, and the arbitrary new method disclosing or step or any new combination of process.

Claims (8)

1. a metro traction power system dc-side short-circuit fault distance measuring equipment, it is characterized in that, comprise host computer, be respectively arranged with at the traction substation of two or more two-side feedings: shunt, 4 current sampling units, 1 voltage sample unit, AD converter group, controlled processing unit, time service unit, wireless signal transmitting element;
Of living in each power transformation: in 4 current sampling units, have 2 current sampling units to gather respectively up contact net electric current and the descending contact net electric current of the A of this electric substation limit track branch road by shunt, other 2 current sampling units gather respectively the up contact net electric current of the B of this electric substation limit track branch road and descending contact net electric current by shunt;
Described voltage sample unit gathers the up contact net voltage of the A of this electric substation limit track branch road or the descending contact net voltage of A limit track branch road or the up contact net voltage of B limit track branch road or the descending contact net voltage of B limit track branch road;
AD converter group has 5 independently AD converter, and in each AD converter, has a startup control end; The output terminal of described 4 current sampling units and 1 voltage sample unit is connected respectively the input end of 5 independent AD converter in described AD converter group; In AD converter group, the output terminal of 5 AD converter all has signal with controlled processing unit and is connected, and in AD converter group, the startup control end of 5 AD converter also all has signal with controlled processing unit and is connected; Controlled processing unit has signal to be connected with time service unit, receives the temporal information of time service unit output; Controlled processing unit has signal with wireless signal transmitting element and is connected, and wireless signal transmitting element is for receiving electric current, the voltage signal of controlled processing unit output and radioing to described host computer;
Described host computer calculates for up contact net electric current, voltage signal or the descending contact net electric current, the voltage signal that receive each the track branch road that each electric substation sends by wireless mode the position that short trouble occurs.
2. a kind of metro traction power system dc-side short-circuit fault distance measuring equipment according to claim 1, it is characterized in that, described controlled processing unit is FPGA, and described FPGA is connected with time service unit, receives time mark information and the pulse per second (PPS) of the output of time service unit; FPGA has counter and storer, and pulse per second (PPS) is used for starting rolling counters forward, and storer is for flag information storage time.
3. a kind of metro traction power system dc-side short-circuit fault distance measuring equipment according to claim 1 and 2, is characterized in that, described host computer quantity is at least 1, and every host computer is communicated by letter with the controlled processing unit of at least 2 electric substations.
4. a metro traction power system dc-side short-circuit fault distance-finding method, is characterized in that, comprises the following steps:
Step 401: up contact net electric current and descending contact net electric current and the up contact net electric current of B limit track branch road and the descending contact net electric current of its A limit track branch road when each electric substation timing acquiring synchronization; Meanwhile, each electric substation gathers the up contact net voltage of A limit track branch road or descending contact net voltage or the up contact net voltage of B limit track branch road or the descending contact net voltage of B limit track branch road of A limit track branch road;
Step 402: each electric substation judges whether the electric current of the electric current of the descending contact net of its A limit, B limit track branch road, up contact net is greater than setting threshold and is greater than the time interval that holding time of setting threshold is greater than setting;
Step 403: be greater than setting threshold and be greater than holding time of setting threshold while being greater than the time interval of setting when electric substation judges in the electric current of descending contact net of its A limit track branch road or the electric current of the electric current of the up contact net of A limit track branch road or the descending contact net of B limit track branch road or the up contact net electric current of B limit track branch road at least one, this current anomaly is thought by electric substation; Do abnormal electric current and voltage data corresponding to described abnormal current of described power transformation adds after get on the right track branch road contact net feeder line mark and acquisition time mark by wireless way for transmitting to host computer;
Step 404: host computer calculates according to electric current, voltage signal that on same contact net on same track branch road, two ends electric substation is transmitted the position that short trouble occurs.
5. a kind of metro traction power system dc-side short-circuit fault distance-finding method according to claim 4, is characterized in that, in step 404, host computer utilizes difference equation
Calculate the position that fault occurs; Wherein, , voltage, the electric current of the location of short circuit place track branch road contact net of location of short circuit one end electric substation transmission while being respectively short trouble generation, , voltage, the electric current of the location of short circuit place track branch road contact net of location of short circuit other end electric substation transmission while generation for short trouble, , , for the equivalent resistance of contact net between Liang Ge electric substation, for rail equivalent resistance, for contact net equivalent inductance, for rail equivalent inductance, the wherein distance of one end electric substation and the ratio of whole piece track branch road contact net length of location of short circuit distance.
6. a kind of metro traction power system dc-side short-circuit fault distance-finding method according to claim 5, it is characterized in that, in described step 401, each electric substation adopts 4 current sampling units to gather respectively respectively the electric current of descending contact net and the electric current of up contact net of the electric current of descending contact net of the described A of electric substation limit track branch road and the electric current of up contact net, B limit track branch road by shunt;
Adopt 1 voltage sample unit to gather the voltage of descending contact net of the described A of electric substation limit track branch road or the voltage of the voltage of the up contact net of A limit track branch road or the voltage of the descending contact net of B limit track branch road or the up contact net of B limit track branch road;
Recycling 5 independently has the AD converter that starts control end the signal of described 4 current sampling units and the output of described voltage sample unit is carried out to AD conversion; 5 independently the output of AD converter be connected to FPGA, FPGA also all has signal to be connected with startup control end, time service unit, the wireless signal transmitting element of described AD converter;
Time service unit is to FPGA output time flag information and pulse per second (PPS), and FPGA starts counting after receiving pulse per second (PPS), starts 5 AD converter samplings in the time that counting reaches default sampling interval simultaneously; FPGA storage simultaneously starts AD converter and starts the time marking while sampling.
7. a kind of metro traction power system dc-side short-circuit fault distance-finding method according to claim 6, it is characterized in that, in described step 402, the FPGA in each electric substation judges whether the electric current of the electric current of the descending contact net of its A of place electric substation limit, B limit track branch road, up contact net is greater than setting threshold and is greater than the time interval that holding time of setting threshold is greater than setting.
8. a kind of metro traction power system dc-side short-circuit fault distance-finding method according to claim 7, it is characterized in that, in described step 403, described FPGA is greater than the electric current in the time interval of setting and corresponding voltage signal thereof and adds and get on the right track after branch road contact net feeder line mark and sampling time mark being greater than setting threshold and being greater than holding time of setting threshold, exports to host computer by wireless signal transmitting element.
CN201210004742.2A 2012-01-10 2012-01-10 Direct-current-side short-circuit fault distance measuring device and method of metro tractive power supply system CN102707190B (en)

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