CN102508018A - Stray current monitoring and protecting device and method - Google Patents
Stray current monitoring and protecting device and method Download PDFInfo
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- CN102508018A CN102508018A CN2011103544827A CN201110354482A CN102508018A CN 102508018 A CN102508018 A CN 102508018A CN 2011103544827 A CN2011103544827 A CN 2011103544827A CN 201110354482 A CN201110354482 A CN 201110354482A CN 102508018 A CN102508018 A CN 102508018A
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Abstract
The invention relates to the technical field of rail transit, and provides a stray current monitoring and protecting device and a method. The monitoring and protecting device provided by the invention includes a box body and a circuit board; the box body includes a power supply lamp, an alarm lamp and a display screen; the circuit board is arranged inside the box body; and the circuit board includes a sensor measuring circuit, a singlechip work circuit, a liquid crystal display circuit, an alarm circuit, a D/A conversion circuit, an amplifying circuit and an electric drainage circuit. The device adopts a closed ring control system, saves manpower and material resources greatly, integrates monitoring and protecting, and realizes measurement and control integration. By utilizing the data obtained through real-time on-line stray current monitoring, the monitoring and protecting method provided by the invention provides the starting strategy for automatic electric drainage, and avoids damage caused by forced electric drainage; meanwhile, the principle of monitoring and protecting by zone is adopted, so that the system extension can be realized; and the existing monitoring system resource can be effectively utilized, so that the repeated investment in communication lines can be avoided.
Description
Technical field
The present invention relates to the track traffic technical field, specifically, is a kind of monitoring of stray current protective device and method.
Background technology
In urban track traffic direct current gasification Orbital Transport Systems; With track as reflux; Because track can not insulate over the ground fully; And there is voltage drop in return curcuit, thereby causes a part of load current to flow to sleeper, railway roadbed and the underground rail metallic facility from track going, and this part electric current is exactly stray current (referring to an accompanying drawing 1).The existence of stray current produces galvanic corrosion to the communication cable buried underground in light rail or the subway surrounding soil, metal pipe lines such as steel pipe, reinforcing bar in the running tunnel, destroys its intensity, reduces its life-span.Simultaneously, stray current also can cause the person to get an electric shock.On platform; Potential difference (PD) between the subway passenger trick is △ V; When potential difference (PD) was very high, stray current corrosion mechanism and iron and steel all had the redox reaction of anodic process and cathodic process under the air conditions or the same at the spontaneous corrosion that in the WS and soil electrolyte, takes place.It is very difficult keeping in repair and change the xoncrete structure that stray current corrosion damages, and it has directly influenced the realization of urban rail transit construction project of vital and lasting importance.Therefore, actively develop the automatic monitoring protection research of track traffic stray current, significant to the safe and reliable and lasting operation of urban track traffic.
Because in the track traffic; Direct supply, lead, vehicle body and rail have formed complete current supply circuit, but some electric current is because rail lacks insulation measures, thereby cause a part of load current to flow to sleeper, railway roadbed, telecommunication cable and the underground steel pipe reinforcing bar facility from track going; This has just formed the loop of stray current; This part electric current can corrode underground pipeline, therefore, needs a kind of current drainage scheme and is used to reduce, eliminate stray current; So the current drainage direction and the stray current that provide are in the opposite direction, just can reach the current drainage effect.(referring to Fig. 2)
At present, the track traffic monitoring stray current guard system of existence is by main website collection, the storaging current of each subregion monitoring, finally carries out data analysis, judgement by monitoring center, final current drainage.This need drop into a large amount of man power and materials and carry out policer operation.Though also there is a kind of stray current detector at present; But, with regard to the ducted stray current of rapid evaluation stray current is monitored on ground, the data of its collection can be stored on the jumbo USB flash disk; But it can't accurately be located and flow into point compiling of stray current and flow out point.Therefore, need a kind of monitoring of stray current protective device of design to solve the problems referred to above.
Summary of the invention
The object of the invention is to overcome the defective of prior art; A kind of monitoring of stray current protective device is proposed; Not only can remove huge monitoring network from; Save the man power and material, and can enrich the function of existing detector, thereby can under operatorless condition, carry out on-line monitoring, protection and warning; Second purpose of the present invention is the method that provides said device to use.
For realizing above-mentioned purpose, the technical scheme that the present invention takes is:
A kind of monitoring of stray current protective device is characterized in that, comprises casing and wiring board; Said casing comprises power lights, alarm lamp and display screen; Be provided with wiring board at said box house; Said wiring board comprises sensor measuring circuit, single-chip microcomputer operating circuit, liquid crystal display circuit, warning circuit, D/A change-over circuit, amplifying circuit and current drainage circuit; Said sensor measuring circuit is electrically connected with Metallic rod and the said single-chip microcomputer operating circuit that the outside is buried underground respectively; Said sensor measuring circuit comprises Hall current sensor and resistance in series, is used for changing the stray current signal of collected outside into analog voltage signal through said Hall current sensor and resistance in series; Said single-chip microcomputer operating circuit is electrically connected with said sensor measuring circuit, said liquid crystal display circuit, said warning circuit and said D/A change-over circuit respectively; Said single-chip microcomputer operating circuit comprises single-chip microcomputer, A/D modular converter and I/O interface; Wherein, Said A/D modular converter is used for converting said analog voltage signal to digital voltage signal; Said single-chip microcomputer is used for discriminatory analysis and handles said digital signal whether within the scope of said single-chip microcomputer plug-in, and said I/O interface is used to transmit alerting signal to said warning circuit; Said D/A change-over circuit is electrically connected with said single-chip microcomputer operating circuit and said amplifying circuit respectively, is used for converting said digital voltage signal to analog voltage signal; Said amplifying circuit is electrically connected with said D/A change-over circuit and said current drainage circuit respectively; Said amplifying circuit comprises transistor and internal resistance stable loop; Wherein, Said transistor is used for said analog voltage signal is carried out the processing and amplifying of corresponding multiple, and the voltage signal that obtains amplifying, said internal resistance stable loop are used for converting the voltage signal of said amplification into current signal; Said current drainage circuit is electrically connected with said amplifying circuit and the external Metallic rod of burying underground respectively.
Further, said display screen is installed in the surface of said casing, is used to show the magnitude of voltage of the said digital voltage signal of receiving.
Further, said warning circuit is connected with said alarm lamp, is used for receiving that said alerting signal is sent to alarm lamp, so that in time remind the user.
For realizing above-mentioned purpose, the technical scheme that the present invention takes is:
A kind of method of monitoring of stray current protective device adopts said monitoring of stray current protective device, it is characterized in that, comprises the steps:
(1) gathers the stray current data, gather stray current through said sensor measuring circuit;
(2) convert voltage into,, convert the stray current of gathering into voltage signal through the Hall current sensor and the resistance in series of said sensor measuring circuit;
(3) discriminatory analysis is set several sections voltage range shelves through the single-chip microcomputer plug-in and is carried out discriminatory analysis, and makes handled;
1. too small stray current can be ignored, and single-chip microcomputer is not taked current drainage, carries out corresponding liquid crystal display;
2. general stray current, single-chip microcomputer carries out corresponding current drainage and liquid crystal display according to residing voltage range shelves;
3. excessive stray current, sampling numerical value surpasses the voltage range shelves of single-chip microcomputer plug-in, the maximal value of liquid crystal display setting voltage scope shelves; Report to the police,, notify the related personnel to take the necessary measures through said alarm lamp; Current drainage is to greatest extent carried out the operation of current drainage to greatest extent through said single-chip microcomputer plug-in and current drainage circuit;
(4) liquid crystal display, the voltage value of the scope shelves of the current handled stray current of demonstration on said display screen;
(5) convert simulating signal into, convert digital voltage signal into analog voltage signal through the D/A change-over circuit;
(6) amplify also current drainage, with the analog voltage signal processing and amplifying, transfer said analog voltage signal to current signal, and utilize the current drainage loop to accomplish the current drainage operation through amplifying circuit.
Good effect of the present invention is:
(1) removes huge monitoring network from, saved the man power and material, also enriched the function of existing detector;
(2) realized under operatorless situation, accomplishing on-line monitoring and protection, and had both the function that warning is arranged.
Description of drawings
Fig. 1 produces synoptic diagram for stray current;
Fig. 2 is a stray current drainage method synoptic diagram;
Fig. 3 is the structural representation of the casing of monitoring of stray current protective device of the present invention;
Fig. 4 is the structural representation of the wiring board of monitoring of stray current protective device of the present invention;
Fig. 5 is the theory diagram of monitoring of stray current protective device of the present invention;
Fig. 6 is the scheme of installation of monitoring of stray current protective device of the present invention;
Fig. 7 is the work synoptic diagram of monitoring of stray current protective device of the present invention;
Fig. 8 is the step block diagram of monitoring of stray current means of defence of the present invention;
Label among the figure is respectively:
10, track; 20, current drainage net; 30, monitoring of stray current protective device;
31, casing; 32, wiring board;
311, power lights; 312, alarm lamp; 313, display screen;
321, Hall current sensor; 322, drain wire;
1, sensor measuring circuit; 2, single-chip microcomputer operating circuit;
3, liquid crystal display circuit; 4, warning circuit;
5, D/A change-over circuit; 6, amplifying circuit; 7, current drainage circuit; 8, stray current.
Embodiment
Elaborate below in conjunction with the embodiment of accompanying drawing to monitoring of stray current protective device of the present invention and method.
Referring to Fig. 3～5, monitoring of stray current protective device 30 of the present invention comprises casing 31 and wiring board 32, and said casing 31 comprises power lights 311, alarm lamp 312 and display screen 313; Be provided with wiring board 32 in said casing 31 inside; Said wiring board 32 comprises sensor measuring circuit 1, single-chip microcomputer operating circuit 2, liquid crystal display circuit 3, warning circuit 4, D/A change-over circuit 5, amplifying circuit 6 and current drainage circuit 7; Said sensor measuring circuit 1 is electrically connected with Metallic rod and the said single-chip microcomputer operating circuit 2 that the outside is buried underground respectively; Said sensor measuring circuit 1 comprises Hall current sensor and resistance in series, is used for changing the stray current signal of collected outside into analog voltage signal through said Hall current sensor and resistance in series; Said single-chip microcomputer operating circuit 2 is electrically connected with said sensor measuring circuit 1, said liquid crystal display circuit 3, said warning circuit 4 and said D/A change-over circuit 5 respectively; Said single-chip microcomputer operating circuit 2 comprises single-chip microcomputer, A/D modular converter and I/O interface; Wherein, Said A/D modular converter is used for converting analog voltage signal to digital voltage signal; Said single-chip microcomputer is used for discriminatory analysis and handles said digital voltage signal whether within the scope of said single-chip microcomputer plug-in, and said I/O interface is used to transmit alerting signal to said warning circuit; Said D/A change-over circuit 5 is electrically connected with said amplifying circuit 6 with said single-chip microcomputer operating circuit 2 respectively, is used for converting said digital voltage signal to analog voltage signal; Said amplifying circuit 6 is electrically connected with said current drainage circuit 7 with said D/A change-over circuit 5 respectively; Said amplifying circuit 6 comprises transistor and internal resistance stable loop; Wherein, Said transistor is used for said analog voltage signal is carried out the processing and amplifying of corresponding multiple, and the voltage signal that obtains amplifying, said internal resistance stable loop are used for converting the voltage signal of said amplification into current signal; Said current drainage circuit 7 is electrically connected with the external Metallic rod of burying underground with said amplifying circuit 6 respectively.In addition, said display screen 313 is installed in the surface of said casing 31, is used to show the magnitude of voltage of the said digital voltage signal of receiving.Said warning circuit 4 is connected with said alarm lamp 312, is used for receiving that said alerting signal is sent to alarm lamp 312, so that in time remind the user, strengthens safeguard measure, perhaps maintenance in time.
Referring to Fig. 6 (scheme of installation of monitoring of stray current protective device of the present invention), said monitoring of stray current protective device 30 is electrically connected with outside current drainage net 20, said current drainage net 20 be arranged on the outside track 10 under.Because track 10 can not insulate over the ground fully, and track can cause the voltage drop of return curcuit as reflux, thereby causes stray current to flow to sleeper, railway roadbed and the underground rail metallic facility from track going.Through the setting of said current drainage net 20, carry out current drainage where necessary, to reduce the harm that said stray current causes.
Referring to Fig. 7 (the work synoptic diagram of monitoring of stray current protective device of the present invention); The Hall current sensor 321 of said sensor measuring circuit 1 links to each other with the underground Metallic rod of burying underground, collects stray current through said Hall current sensor 321, records the stray current size; Because the track stray current is usually about 100A; Current ratio is bigger, and traditional current transformer measuring error is bigger, and secondary side does not allow open circuit when using; So the present invention adopts said Hall current sensor, it more can measure bigger stray current effectively accurately than the current transformer of normal employing at present.Said Hall current sensor transfers the stray current of collecting to analog voltage signal.Said analog voltage signal can make voltage reduce through said resistance in series, is low-voltage with the voltage that guarantees the said single-chip microcomputer operating circuit 2 of input, is not easy to cause the damage to the single-chip microcomputer components and parts.Said low-voltage converts digital voltage signal into through the A/D modular converter of said single-chip microcomputer operating circuit 2.Said single-chip microcomputer carries out analysis and judgement to said digital voltage signal; Because said single-chip microcomputer plug-in has been set several segment limits, according to the scope at said digital voltage signal place, said single-chip microcomputer is done different operation; Can avoid the wasting of resources like this; The stray current of different sizes obtains handled, and so as to not make and cause very little stray current also very big current drainage will be provided, even the retroaction that causes.When measured voltage signal within the scope of said single-chip microcomputer plug-in, transmit digital voltage signal to the D/A change-over circuit 5 that is electrically connected with said single-chip microcomputer operating circuit 2; When measured said digital voltage signal outside the maximum magnitude of said single-chip microcomputer plug-in; Selecting the maximal value in the maximum magnitude for use is digital voltage signal, and triggers said warning circuit 4, and said warning circuit 4 is electrically connected with outside alarm lamp 312; So that notify the operator on duty; Need to strengthen safeguard measure, perhaps maintenance in time is because stray current possibly cause damage to human body or equipment.Warning is to adopt batch (-type), can manually stop.Simultaneously, said single-chip microcomputer triggers and carries out the operation of current drainage to greatest extent.Digital voltage signal from said single-chip microcomputer operating circuit 2 outputs changes analog voltage signal into through said D/A change-over circuit 5.Then, said analog voltage signal carries out the processing and amplifying of corresponding multiple, the voltage signal that obtains amplifying through the transistor of said amplifying circuit 6; Again through said internal resistance stable loop; Convert the voltage signal of said amplification into current signal, said current signal flows to the outside Metallic rod of burying underground through drain wire 322 (drain wire 322 is connected with said current drainage circuit 7), thereby forms a current drainage loop; Reduce the stray current corrosion damage with this, protected the safety of track traffic.Package unit adopts closed-loop control system, has saved great amount of manpower and material resources, reaches monitoring protection simultaneously, has realized measurement and control integration.
Referring to Fig. 8 (the step block diagram of monitoring of stray current means of defence of the present invention).The method of monitoring of stray current protection of the present invention may further comprise the steps:
(1) gathers the stray current data, gather stray current through said sensor measuring circuit;
(2) convert voltage into,, convert the stray current of gathering into voltage signal through the Hall current sensor and the resistance in series of said sensor measuring circuit;
(3) discriminatory analysis; Carry out discriminatory analysis through the single-chip microcomputer plug-in; Because said single-chip microcomputer plug-in has been set several sections voltage range shelves, according to the residing voltage range shelves of said voltage signal, it is (same that said single-chip microcomputer is done different operation; Also can voltage signal be passed to and the functionally similar central control unit of single-chip microcomputer, central control unit carries out discriminatory analysis according to the safe range value that presets in advance);
1. too small stray current can be ignored, and single-chip microcomputer is not taked current drainage, carries out corresponding liquid crystal display;
2. general stray current, single-chip microcomputer carries out corresponding current drainage and liquid crystal display according to residing voltage range shelves;
3. excessive stray current, sampling numerical value surpasses the voltage range shelves of single-chip microcomputer plug-in, the maximal value of liquid crystal display setting voltage scope shelves; Report to the police,, notify the related personnel to take the necessary measures through said alarm lamp; Current drainage is to greatest extent carried out the operation of current drainage to greatest extent through said single-chip microcomputer plug-in and current drainage circuit;
(4) liquid crystal display, the voltage value of the scope shelves of the current handled stray current of demonstration (annotate: too small stray current, liquid crystal display are 0V) on said display screen;
(5) convert simulating signal into, convert digital voltage signal into analog voltage signal through the D/A change-over circuit;
(6) amplify also current drainage; Analog voltage signal is carried out the processing and amplifying of corresponding multiple through the transistor of amplifying circuit; And utilize said internal resistance stable loop, and converting the voltage signal of said amplification into current signal, said current signal flows to the outside Metallic rod of burying underground through drain wire; Thereby form the current drainage loop, accomplish the current drainage operation.
Said monitoring of stray current means of defence can be designed to a kind of device, also can be designed to a control system, and its monitoring center can be placed on the dispatching center of track traffic, carries out the subregion monitoring.When track circuit extends, can realize system extension, and can effectively utilize existing monitoring system resource, avoid the overlapping investment of communication line.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.
Claims (4)
1. a monitoring of stray current protective device is characterized in that, comprises casing and wiring board; Said casing comprises power lights, alarm lamp and display screen; Be provided with wiring board at said box house; Said wiring board comprises sensor measuring circuit, single-chip microcomputer operating circuit, liquid crystal display circuit, warning circuit, D/A change-over circuit, amplifying circuit and current drainage circuit; Said sensor measuring circuit is electrically connected with Metallic rod and the said single-chip microcomputer operating circuit that the outside is buried underground respectively, and said sensor measuring circuit comprises Hall current sensor and resistance in series; Said single-chip microcomputer operating circuit is electrically connected with said sensor measuring circuit, said liquid crystal display circuit, said warning circuit and said D/A change-over circuit respectively, and said single-chip microcomputer operating circuit comprises single-chip microcomputer, A/D modular converter and I/O interface; Said D/A change-over circuit is electrically connected with said single-chip microcomputer operating circuit and said amplifying circuit respectively; Said amplifying circuit is electrically connected with said D/A change-over circuit and said current drainage circuit respectively, and said amplifying circuit comprises transistor and internal resistance stable loop; Said current drainage circuit is electrically connected with said amplifying circuit and the external Metallic rod of burying underground respectively.
2. monitoring of stray current protective device as claimed in claim 1 is characterized in that said display screen is installed in the surface of said casing.
3. monitoring of stray current protective device as claimed in claim 1 is characterized in that, said warning circuit is connected with said alarm lamp.
4. the method for a monitoring of stray current protection adopts the described monitoring of stray current protective device of claim 1, it is characterized in that, comprises the steps:
(1) gathers the stray current data, gather stray current through said sensor measuring circuit;
(2) convert voltage into,, convert the stray current of gathering into voltage signal through the Hall current sensor and the resistance in series of said sensor measuring circuit;
(3) discriminatory analysis is set several sections voltage range shelves through the single-chip microcomputer plug-in and is carried out discriminatory analysis, and makes handled;
Too small stray current can be ignored, and single-chip microcomputer is not taked current drainage, carries out corresponding liquid crystal display;
General stray current, single-chip microcomputer carries out corresponding current drainage and liquid crystal display according to residing voltage range shelves;
Excessive stray current, sampling numerical value surpasses the voltage range shelves of single-chip microcomputer plug-in, the maximal value of liquid crystal display setting voltage scope shelves; Report to the police,, notify the related personnel to take the necessary measures through said alarm lamp; Current drainage is to greatest extent carried out the operation of current drainage to greatest extent through said single-chip microcomputer plug-in and current drainage circuit;
(4) liquid crystal display, the voltage value of the scope shelves of the current handled stray current of demonstration on said display screen;
(5) convert simulating signal into, convert digital voltage signal into analog voltage signal through the D/A change-over circuit;
(6) amplify also current drainage, with the analog voltage signal processing and amplifying, transfer said analog voltage signal to current signal, and utilize the current drainage loop to accomplish the current drainage operation through amplifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110354482.7A CN102508018B (en) | 2011-11-10 | 2011-11-10 | Stray current monitoring and protecting device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110354482.7A CN102508018B (en) | 2011-11-10 | 2011-11-10 | Stray current monitoring and protecting device and method |
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| CN102508018A true CN102508018A (en) | 2012-06-20 |
| CN102508018B CN102508018B (en) | 2014-02-26 |
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| CN201110354482.7A Expired - Fee Related CN102508018B (en) | 2011-11-10 | 2011-11-10 | Stray current monitoring and protecting device and method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124828A (en) * | 2016-06-28 | 2016-11-16 | 中国船舶重工集团公司第七二五研究所 | A kind of novel seawaterline stray current detecting device |
| CN107656125A (en) * | 2017-08-09 | 2018-02-02 | 中国船舶重工集团公司第七二五研究所 | A kind of seawater stray electrical current in-situ monitoring device |
| CN108169547A (en) * | 2017-11-14 | 2018-06-15 | 中国船舶重工集团公司第七二五研究所 | Drainage method and device is detected automatically for the stray electrical current of ship seawaterline |
| CN109143927A (en) * | 2018-08-17 | 2019-01-04 | 无锡市格林电工装备有限公司 | A kind of rail stray electrical current removing method, apparatus and system |
| CN109387680A (en) * | 2018-10-15 | 2019-02-26 | 国网四川省电力公司电力科学研究院 | Urban rail tractive power supply system and urban electric power main transformer D.C. magnetic biasing synchronous monitoring system |
| CN109932589A (en) * | 2019-03-04 | 2019-06-25 | 西南交通大学 | The stray electrical current experimental system for simulating and method of Subway DC Traction |
| CN114624532A (en) * | 2022-03-14 | 2022-06-14 | 华东交通大学 | Stray current corrosion resistant power grid detection device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124828A (en) * | 2016-06-28 | 2016-11-16 | 中国船舶重工集团公司第七二五研究所 | A kind of novel seawaterline stray current detecting device |
| CN107656125A (en) * | 2017-08-09 | 2018-02-02 | 中国船舶重工集团公司第七二五研究所 | A kind of seawater stray electrical current in-situ monitoring device |
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| CN108169547A (en) * | 2017-11-14 | 2018-06-15 | 中国船舶重工集团公司第七二五研究所 | Drainage method and device is detected automatically for the stray electrical current of ship seawaterline |
| CN109143927A (en) * | 2018-08-17 | 2019-01-04 | 无锡市格林电工装备有限公司 | A kind of rail stray electrical current removing method, apparatus and system |
| CN109143927B (en) * | 2018-08-17 | 2021-08-17 | 无锡市格林电工装备有限公司 | Method, device and system for eliminating stray current of running rail |
| CN109387680A (en) * | 2018-10-15 | 2019-02-26 | 国网四川省电力公司电力科学研究院 | Urban rail tractive power supply system and urban electric power main transformer D.C. magnetic biasing synchronous monitoring system |
| CN109387680B (en) * | 2018-10-15 | 2020-12-08 | 国网四川省电力公司电力科学研究院 | Urban rail traction power supply system and urban electric power main transformer direct-current magnetic bias synchronous monitoring system |
| CN109932589A (en) * | 2019-03-04 | 2019-06-25 | 西南交通大学 | The stray electrical current experimental system for simulating and method of Subway DC Traction |
| CN114624532A (en) * | 2022-03-14 | 2022-06-14 | 华东交通大学 | Stray current corrosion resistant power grid detection device |
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| CN102508018B (en) | 2014-02-26 |
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