CN106569017A - Rail transit stray current detection method and detection system - Google Patents
Rail transit stray current detection method and detection system Download PDFInfo
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- CN106569017A CN106569017A CN201611004171.7A CN201611004171A CN106569017A CN 106569017 A CN106569017 A CN 106569017A CN 201611004171 A CN201611004171 A CN 201611004171A CN 106569017 A CN106569017 A CN 106569017A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2513—Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
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Abstract
The invention discloses a rail transit stray current detection method and a detection system, which relate to the technical field of rail transit and solve the technical defect that local measurement by the existing stray current detection method results in poor measurement result precision. Through four current sensors, current values in preset sections at two ends of two return current rails of an operating rail are detected respectively, the four current values synchronously communicate to a processing module respectively, the processing module compares the current value sum of two sensors at one end of the two return current rails and the current value sum of two sensors at the other end of the two return current rails, a difference is calculated, the difference is the rail transit stray current value, the processing module outputs the rail transit stray current value to a display module, and the rail transit stray current value is displayed. The difference is calculated according to the current values at two ends, the rail transit stray current value is thus obtained, the subway stray current is thus analyzed comprehensively on the whole, and the stray current detection accuracy is improved.
Description
Technical field
The present invention relates to technical field of rail traffic, and in particular to track traffic stray electrical current detection method.
Background technology
In track traffic, especially subway system, operation rail is applied not only to undertake the loading of vehicle, will also be used as traction
The return current rail of electric power system, that is to say that operation rail is connected to traction substation by return wire, forms a complete traction and supplies
Electrical circuit.
Operation rail is very easy to produce stray electrical current as the return current rail of tractive power supply system.The original that stray electrical current is produced
Because being：General contact net is positive pole, and rail of walking doubles as return wire.Because return wire rail has electrical impedance, traction current
Pressure drop is produced in return current rail, complete insulation against ground can not possibly be reached due to running rail, so return current rail has over the ground current potential
Difference, return wire has certain leakage current, Leakage Current to railway roadbed, surrounding soil media, underground structure, Buried pipe
Rail is included into again along the medium such as underground structure, Buried pipe negative feedback point surrounding, and this leakage current is referred to as confused stream, also known as ground
Iron stray electrical current.Stray electrical current is a kind of harmful electric current, can be to the underground metalliferous body near track, the such as structural steel of building
Muscle, water pipe, gas piping, communication cable etc. cause electrochemical corrosion, produce security implication.
Traditional stray electrical current detection method is during subway construction, to have buried reference in subway tunnel interval in advance
Electrode, and measurement terminal is drawn from structure reinforcing bars, within a certain period of time, artificial operation connects wire and measures record.Due to
It is local measurement, the result of measurement can not reflect whole subway line stray electrical current distribution situation.
The content of the invention
In sum, it is an object of the invention to solve existing stray electrical current detection method because of local measurement, the knot of measurement
The technical deficiency of fruit low precision, and propose a kind of track traffic stray electrical current detection method.
To solve technical problem proposed by the invention, the technical scheme for adopting for:A kind of track traffic stray electrical current inspection
Survey method, it is characterised in that methods described is：
In DC traction Rail Transit System, using operation rail as the occasion of return current rail, in train detected fortune is entered
Row rail, but when being introduced into detection zone, detect that the two ends of operation two return current rails of rail are preset respectively by four current sensors
The current value of section, four current values respectively by synchronous communication to processing module, by processing module by two return current rails wherein
Two sensor current value sums of one end are compared with the current value sum of two sensors of two return current rail other ends
Difference is calculated, the difference is track traffic Stray current values, processing module again exports track traffic Stray current values to aobvious
Show that module is shown.
Four described current sensor working powers are gathered from operation rail and obtained, without train on detected operation rail
When, off-position at four current sensors.
Four described current sensors are set up respectively by RS-458, CAN or ethernet communication mode and processing module
Signal synchronized links.
Realize the detecting system of the detection method, it is characterised in that the system includes processing module, and difference
Four current sensors being connected by synchronous communication with processing module；Four described current sensors are separately mounted to operation
The two ends of two return current rails of rail, detect respectively the current value of the default section in two ends of two return current rails, and synchronism output is to described
Processing module；Described processing module is used to return two sensor current value sums of two return current rails wherein one end with two
The current value sum of two sensors of the trajectory other end is compared calculating, and the difference after calculating is compared in output.
Four described current sensors include two corresponding with return current rail default section two-end-point connections respectively
Two inputs, two inputs are parallel with power supply Acquisition Circuit and calculus of differences amplifying circuit, and calculus of differences amplifying circuit connects
MCU is connected to, MCU is also associated with communicating circuit；Described power supply Acquisition Circuit gathers the voltage between two inputs, voltage stabilizing output
Working power needed for calculus of differences amplifying circuit, MCU and communicating circuit；Described calculus of differences amplifying circuit is used for defeated to two
Entering the current potential at end carries out calculus of differences, output current analog quantity to MCU；Described MCU is used for defeated to calculus of differences amplifying circuit
The current-mode analog quantity for going out carries out analog-to-digital conversion, and current value is exported to communicating circuit, is transmitted to processing module by communicating circuit.
Beneficial effects of the present invention are：The present invention is the current value by measuring the default section in the two ends of two return current rails,
Difference is relatively calculated according to the current value ratio at two ends, so as to obtain track traffic Stray current values, total score on the whole is reached
Metro stray current is separated out, stray electrical current accuracy of detection is improve.
The present invention adopts four current sensors, and four current sensor principles are identical, the two ends of each current sensor
Respectively two diverse locations in operation rail, the operation of four current sensors, two cable connections are directly connected to by cable
Rail spacing is identical, can be measured by current sensor and obtain running 2 respective segments for connecting current sensor two ends on rail
Electric current, while collecting the electric current on operation rail, compare operation rail two ends difference, calculate miscellaneous between operation rail two ends
Scattered current value.
Description of the drawings
Fig. 1 is the principle schematic of the present invention.
Fig. 2 is the current sensor circuit principle schematic of the present invention.
Fig. 3 is the processing module and display device schematic diagram of the present invention.
Specific embodiment
The method of present invention detection stray electrical current is made into one below in conjunction with accompanying drawing and currently preferred specific embodiment
Step ground explanation.
It is well known that the operation rail of one section of subway includes parallel two return current rail, complete lead to form one
Draw current supply circuit, two return current rails need to be connected to traction substation by return wire respectively；And the method for the present invention is in train
Into detected operation rail, but when being introduced into detection zone, detect that two, operation rail is returned respectively by four current sensors
The current value of the default section in the two ends of trajectory, four current values, will by processing module respectively by synchronous communication to processing module
The electric current of two return current rails wherein two sensor current value sums of one end and two sensors of two return current rail other ends
Value sum is compared and calculates difference, and the difference is track traffic Stray current values.Detection zone refers to the section L1 in Fig. 1
Region corresponding to+L+L4.
With reference to shown in Fig. 1, if the two ends of four detection operation two return current rails of rail of current sensor 1,2,3,4 are preset
Length L1, L2 of section, L3 and L4 are 10 meters.That is to say each current sensor by two cable connections at same time
On two differences on trajectory, the spacing of the two points is 10 meters.Current sensor 1 is connected to two with current sensor 2
Parallel return current rail with one end same upright position, it is another that current sensor 3 is connected to two parallel return current rails with current sensor 4
The same upright position of one end；Tie point of the current sensor 1 on return current rail and connection of the current sensor 4 on return current rail
The spacing of point is L.
Because the rail model resistivity that track traffic is adopted is fixed, it is assumed that for ρ；Rail sectional area is fixed, it is assumed that for s,
By resistance formula：R=ρ * 10/s, can calculate the rail resistance that length is 10 meters, it is assumed that for R10.Four current sensors
1st, the electric current of current value I1, I2, I3, I4 size measured by 2,3,4 and each self-corresponding return current rail section L1, L2, L3, L4
It is directly proportional, current value I1, I2, I3, the I4 measured by four current sensors 1,2,3,4 is inputed to into processing module, by processes
Module is according to current value sum I1+I2 of two current sensors 1 and 2 of return current rail wherein one end and two electric currents of the other end
Current value sum I3+I4 of sensor 3,4 relatively calculates difference, namely the difference is track traffic Stray current values, and road is handed over
Logical Stray current values Id=（I1+ I2）-（I3+ I4）, current value Id be length be L track traffic rail area it is spuious
Track traffic Stray current values Id is exported shown to display module again by current value, processing module.
With reference to shown in Fig. 2, four current sensor circuit principles are identical, will be measured by calculus of differences amplifying circuit
Corresponding return current rail section current value be input to MCU, analog-to-digital conversion is carried out by MCU, and passed through RS-458, CAN or ether
Net communication modes synchronous transfer relatively calculates difference to processing module by processing module.It is assumed that resistance R1=resistance R6, resistance
R2=resistance R5, the voltage for being input to the analog-to-digital conversion pin of MCU is U, can so calculate return current rail respective segments two ends
Voltage is UR =-R2/R1*U, according to Current calculation formula I=U/R, can calculate the electric current flow through in track:I = -
（R2/R1*U）/R10.By this formula, I1, I2, I3 and I4 can be respectively calculated.
It is logical comprising ethernet communication module, RS-485 communication modules and CAN with reference to Fig. 3, processing module and display device
News module.By these three communication modules, processing module and display device, can be from current sensor 1, current sensor 2, electricity
Flow sensor 3 and current sensor 4, by Ethernet, RS-485 buses or CAN mode, obtain in real time track traffic steel
Rail electric current I1, I2, I3 and I4.By MCU processors, carry out calculating the size of the region stray electrical current that rail length is L
I= (I1 +I2) -(I3 +I4)；Then, MCU processors, by the size of current of electric current I, output is shown to liquid crystal display.
Shown in seeing figures.1.and.2, track traffic stray electrical current detecting system of the present invention includes processing module, and
Four current sensors being connected by synchronous communication with processing module respectively；Four described current sensors are separately mounted to
The two ends of operation two return current rails of rail, detect respectively the current value of the default section in two ends of two return current rails, and synchronism output is extremely
The processing module；Described processing module is used for two sensor current value sums and two of two return current rails wherein one end
The current value sum of two sensors of the root return current rail other end is compared calculating, and the difference after calculating is compared in output.It is described
Four current sensors include two inputs of two default section two-end-point connections corresponding with return current rail respectively, two
Individual input is parallel with power supply Acquisition Circuit and calculus of differences amplifying circuit, and calculus of differences amplifying circuit is connected with MCU, and MCU is also
It is connected with communicating circuit；Described power supply Acquisition Circuit gathers the voltage between two inputs, voltage stabilizing output difference operation amplifier
Working power needed for circuit, MCU and communicating circuit；Described calculus of differences amplifying circuit is used to enter the current potential of two inputs
Row calculus of differences, output current analog quantity to MCU；Described MCU is used for the current analog to calculus of differences amplifying circuit output
Amount carries out analog-to-digital conversion, and current value is exported to communicating circuit, is transmitted to processing module by communicating circuit.
Claims (6)
1. a kind of track traffic stray electrical current detection method, it is characterised in that methods described is：
In DC traction Rail Transit System, using operation rail as the occasion of return current rail, in train detected fortune is entered
Row rail, but when being introduced into detection zone, detect that the two ends of operation two return current rails of rail are preset respectively by four current sensors
The current value of section, four current values respectively by synchronous communication to processing module, by processing module by two return current rails wherein
Two sensor current value sums of one end are compared with the current value sum of two sensors of two return current rail other ends
Difference is calculated, the difference is detection zone track traffic Stray current values.
2. a kind of track traffic stray electrical current detection method according to claim 1, it is characterised in that：Four described electricity
Flow sensor sets up signal synchronized links by RS-458, CAN or ethernet communication mode and processing module respectively.
3. a kind of track traffic stray electrical current detection method according to claim 1, it is characterised in that：Four described electricity
Flow sensor working power is gathered from operation rail and obtained, when on detected operation rail without train, at four current sensors
Off-position.
4. a kind of track traffic stray electrical current detection method according to claim 1, it is characterised in that：Described process mould
Track traffic Stray current values are exported shown to display module again by block.
5. the detecting system of detection method described in any one of Claims 1-4 is realized, it is characterised in that the system includes place
Reason module, and four current sensors being connected by synchronous communication with processing module respectively；Four described current senses
Device is separately mounted to run the two ends of two return current rails of rail, and the current value of the default section in two ends of two return current rails is detected respectively,
And synchronism output is to the processing module；Described processing module is used for two sensor electricity of two return current rails wherein one end
Flow valuve sum is compared calculating with the current value sum of two sensors of two return current rail other ends, and output is compared after calculating
Difference.
6. detecting system according to claim 5, it is characterised in that：Four described current sensors include two
Two inputs of default section two-end-point connection corresponding with return current rail respectively, two inputs be parallel with power supply Acquisition Circuit and
Calculus of differences amplifying circuit, calculus of differences amplifying circuit is connected with MCU, and MCU is also associated with communicating circuit；Described power supply collection
Circuit gathers the voltage between two inputs, the work electricity needed for voltage stabilizing output difference operational amplification circuit, MCU and communicating circuit
Source；Described calculus of differences amplifying circuit is used to carry out calculus of differences to the current potential of two inputs, and output current analog quantity is extremely
MCU；Described MCU is used to carry out analog-to-digital conversion to the current-mode analog quantity of calculus of differences amplifying circuit output, and current value is defeated
Go out to communicating circuit, transmitted to processing module by communicating circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611004171.7A CN106569017B (en) | 2016-11-15 | 2016-11-15 | A kind of rail traffic stray electrical current detection method and detection system |
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|---|---|---|---|
| CN201611004171.7A CN106569017B (en) | 2016-11-15 | 2016-11-15 | A kind of rail traffic stray electrical current detection method and detection system |
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| CN106569017A true CN106569017A (en) | 2017-04-19 |
| CN106569017B CN106569017B (en) | 2019-03-05 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107144772A (en) * | 2017-06-01 | 2017-09-08 | 西南交通大学 | A kind of subway closed guard gate and rail insulating mounting method for testing performance |
| CN108312897A (en) * | 2018-02-09 | 2018-07-24 | 秦扬茗 | Rail traffic surface power supply method and device based on digital signal identification |
| CN109109681A (en) * | 2018-10-18 | 2019-01-01 | 西南交通大学 | The control system and control method of a kind of metro traction institute platform rail potential |
| CN110579696A (en) * | 2019-10-25 | 2019-12-17 | 北京好运达智创科技有限公司 | Insulated detection equipment of truss-like track board steel reinforcement cage |
| CN110749765A (en) * | 2019-10-29 | 2020-02-04 | 徐州和纬信电科技有限公司 | Stray current collection device with synchronous collection function |
| CN110763898A (en) * | 2019-10-16 | 2020-02-07 | 西南交通大学 | Method for acquiring stray current distribution of metro vehicle section |
| CN112230040A (en) * | 2020-10-13 | 2021-01-15 | 广州市扬新技术研究有限责任公司 | Stray current evaluation method for calculating direct current traction power supply system |
| CN112505390A (en) * | 2020-12-17 | 2021-03-16 | 广州市扬新技术研究有限责任公司 | Distributed rail potential and stray current real-time monitoring method |
| CN114435414A (en) * | 2021-09-06 | 2022-05-06 | 中铁建电气化局集团南方工程有限公司 | Special return current rail contact type measuring device for subway |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107144772A (en) * | 2017-06-01 | 2017-09-08 | 西南交通大学 | A kind of subway closed guard gate and rail insulating mounting method for testing performance |
| CN107144772B (en) * | 2017-06-01 | 2019-05-10 | 西南交通大学 | A kind of subway closed guard gate and rail are insulated method for testing performance |
| CN108312897A (en) * | 2018-02-09 | 2018-07-24 | 秦扬茗 | Rail traffic surface power supply method and device based on digital signal identification |
| CN109109681A (en) * | 2018-10-18 | 2019-01-01 | 西南交通大学 | The control system and control method of a kind of metro traction institute platform rail potential |
| CN109109681B (en) * | 2018-10-18 | 2023-06-09 | 西南交通大学 | Control system and control method for potential of platform steel rail of subway traction station |
| CN110763898A (en) * | 2019-10-16 | 2020-02-07 | 西南交通大学 | Method for acquiring stray current distribution of metro vehicle section |
| CN110763898B (en) * | 2019-10-16 | 2021-04-09 | 西南交通大学 | Method for acquiring stray current distribution of metro vehicle section |
| CN110579696A (en) * | 2019-10-25 | 2019-12-17 | 北京好运达智创科技有限公司 | Insulated detection equipment of truss-like track board steel reinforcement cage |
| CN110579696B (en) * | 2019-10-25 | 2024-05-28 | 北京好运达智创科技有限公司 | Truss type track slab reinforcement cage insulation detection equipment |
| CN110749765A (en) * | 2019-10-29 | 2020-02-04 | 徐州和纬信电科技有限公司 | Stray current collection device with synchronous collection function |
| CN112230040A (en) * | 2020-10-13 | 2021-01-15 | 广州市扬新技术研究有限责任公司 | Stray current evaluation method for calculating direct current traction power supply system |
| CN112505390A (en) * | 2020-12-17 | 2021-03-16 | 广州市扬新技术研究有限责任公司 | Distributed rail potential and stray current real-time monitoring method |
| CN112505390B (en) * | 2020-12-17 | 2022-12-16 | 广州市扬新技术研究有限责任公司 | Distributed rail potential and stray current real-time monitoring method |
| CN114435414A (en) * | 2021-09-06 | 2022-05-06 | 中铁建电气化局集团南方工程有限公司 | Special return current rail contact type measuring device for subway |
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