CN101670791A - Metro stray current drainage device - Google Patents
Metro stray current drainage device Download PDFInfo
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- CN101670791A CN101670791A CN200910075699A CN200910075699A CN101670791A CN 101670791 A CN101670791 A CN 101670791A CN 200910075699 A CN200910075699 A CN 200910075699A CN 200910075699 A CN200910075699 A CN 200910075699A CN 101670791 A CN101670791 A CN 101670791A
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Abstract
The invention relates to a metro stray current drainage device which comprises a drainage incoming terminal, a bus bar, a control circuit and a drainage circuit, wherein the control circuit comprisesa signal collection circuit, a micro-controller and an IGBT driving circuit. When in use, the potential of a structural reinforcing bar with a drainage net and the potential of a reference electrode are collected in a real-timer manner, the difference between the two potentials is obtained through the micro-controller, the difference is compared with the reference voltage, when the comparison value is greater than 0.5V, the duty ratio of an IGBT which needs to be changed is figured out by a program in the micro-controller according to the rand-size relationship of the difference between the comparison value and the 0.5V, a control signal for changing is emitted, and the duty ratio of the IGBT is changed through the IGBT driving circuit, thereby automatically changing the resistance of a current-limiting resistor, leading the metro stray current drainage device to drain timely and effectively, reducing the harm of stray current to the lowest level, protecting the safe operation of a metro and effectively reducing the corrosion of the stray current to the structural reinforcing bars along the metro.
Description
Technical field
The present invention relates to metro stray current drainage device.
Background technology
In subway all over the world, generally adopt the power supply of direct current (DC) electricity, and great majority adopt the return flow line of traveling rail as traction current as railcar.Prolongation along with the subway period of service, fricative metallic dust is under the effect of underground wet environment between vehicle and the rail, insulation resistance between rail and the earth is constantly reduced, cause a part of traction current current direction the earth to form stray current (also claiming " fan's stream ").Stray current can produce electrochemical corrosion when flowing through underground metal construction, especially very harmful to subway oil pipeline along the line, gas pipe line, water supply pipe and fabric structure steel along the line etc.
At present the protection of stray current is generally taked the safeguard procedures of " rely mainly on prevention, be auxilliary with row "." rely mainly on prevention ", promptly at first should set about from the source, reduce stray current reveals as far as possible, this requirement is provided with rational tractive power supply system and strengthens the rail ground insulation, insulation between track and sleeper, promptly between track and the cement concrete, take insulation measures between fastener and the concrete sleeper, to reduce the leakage current of rail; The corrosion guard of the pipeline that will strengthen simultaneously being corroded, structure reinforcing bars etc. is made in the subway initial operating stage like this and can receives good effect.So-called " row " promptly is the current drainage method, and laying mattress and being electrically connected in railway roadbed makes it to constitute railway roadbed reinforcing bar collecting net.Newly-built subway mostly is welded into an electric integral body with the structure reinforcing bars of each section railway roadbed, be referred to as railway roadbed current drainage net (main current drainage net), electric integral body is formed in the weldering of the structure reinforcing bars of tunnel wall, claim sidewall current drainage net (auxiliary current drainage net), and it is continuous that cable is crossed by each section current drainage Netcom, make to form low resistance stray current passage in railway roadbed and the sidewall, make this electric current be back to traction substation rectifier negative pole, avoid leaking into underground working the mischief by drain means.
The current drainage method is divided into set current limiting resistance current drainage method and variable restriction resistance current drainage method.Promptly between current drainage net input terminal and bus rod, the connect resistance of a fixed resistance value of set current limiting resistance current drainage, its defective is: when train is in operation load current when very big, track and the current potential difference between the current drainage net near the point that refluxes are very big, therefore the difference of potential between current drainage web frame reinforcing bar and concrete pedestal is also very high, be easy to surpass the 0.5V of industry standard regulation, this current drainage state is called " owing current drainage ", i.e. the dynamics of current drainage is not enough, still causes the reinforcement corrosion of current drainage web frame.For this reason, can reduce the current-limiting resistance value, or be zero, the polarization potential that can make near the current drainage net of point that refluxes like this is less than 0.5V or near zero, and this current drainage state is called " crossing current drainage ", is crossing under the current drainage state, stray current is less to the corrosion harmfulness of current drainage web frame reinforcing bar, but subway load side current potential will increase, and local iron load end above earth potential is during greater than 92V, and action takes place the rail potential restraint device causes the train dead electricity and stop transport.Crossing current drainage, owing current drainage is not desirable current drainage state, and current-limiting resistance should be variable under the desirable current drainage state, and difference of potential between current drainage web frame reinforcing bar and the concrete pedestal is remained in the scope less than 0.5V.Control the current drainage of just may realizing ideal of current-limiting resistance real time altering with this current potential.
At present, the variable restriction resistance current drainage adjustable current-limiting resistance of promptly between current drainage net input terminal and bus rod, connecting, its defective is: the change of current-limiting resistance resistance that this is adjustable relies on manually to be carried out, promptly in service at subway, according to the leak degree of stray current, manually change the resistance that variable restriction resistance inserts the current drainage net, make current drainage reach standard, because of the change and non-automatic the carrying out of this variable restriction resistance access current drainage net resistance, its current drainage effect is undesirable, has hysteresis quality.
Summary of the invention
The present invention can not be in time in order to solve the existing subway stray current drainage device, current drainage effectively, thereby influence the safe operation of subway and subway various metallic conduits along the line, structure reinforcing bars are produced problems such as corrosion, a kind of metro stray current drainage device is provided.
The present invention adopts following technical scheme to realize: metro stray current drainage device, comprise current drainage input terminal, bus rod, control circuit, the current drainage circuit that links to each other with control circuit,
Described control circuit comprises reference electrode, the signal acquisition circuit that links to each other with reference electrode, the microcontroller that links to each other with the mouth of signal acquisition circuit, the IGBT driving circuit that links to each other with microcontroller, and described signal acquisition circuit comprises the voltage signal acquisition circuit;
Described current drainage circuit comprises and contains adjustable current-limiting resistance and be connected in current drainage branch road between current drainage input terminal and the bus rod, described adjustable current-limiting resistance is composed in parallel by insulated gate bipolar transistor and copped wave resistance, and wherein: the current drainage input terminal links to each other with the input end of voltage signal acquisition circuit in the signal acquisition circuit; The grid of insulated gate bipolar transistor links to each other with the IGBT driving circuit.
Above-mentioned IGBT driving circuit is used to control the break-make of IGBT, the voltage signal acquisition circuit is used to gather and amplify the current potential of reference electrode and current drainage web frame steel, to those skilled in the art, the circuit structure of IGBT driving circuit and voltage signal acquisition circuit is to realize easily.
Metro stray current drainage device in use, can be according to current drainage web frame steel and reference electrode current potential extent, calculate the conducting dutycycle of required insulated gate bipolar transistor by the program in the microcontroller, and send drive signal, change the dutycycle of IGBT by the IGBT driving circuit, use IGBT to carry out the high speed DC chopped-wave, thereby change the resistance of current-limiting resistance as the performer of current control.Different dutycycles will produce different current-limiting resistance values, thereby automatically current-limiting resistance be regulated, and make the current drainage process reach perfect condition.
Metro stray current drainage device of the present invention, according to current drainage web frame steel current potential, automatically change the dutycycle of insulated gate bipolar transistor by microcontroller, thereby change the resistance of current-limiting resistance automatically, make metro stray current drainage device can be in time, release effectively, it is minimum that thereby the harm that makes stray current drops to, and the corrosion that ensures the safe operation of subway and reduce subway structure reinforcing bars along the line is produced is for the safe operation of subway has been created necessary condition.
Description of drawings
Fig. 1 is the metro stray current drainage device electrical structure diagram;
Fig. 2 is the main circuit figure of microcontroller in the metro stray current drainage device;
Fig. 3 is the main circuit figure of voltage collection circuit in the signal acquisition circuit;
Fig. 4 is the main circuit figure of voltage and current signal programmable amplifier in the signal acquisition circuit.
In the accompanying drawing: 1-reference electrode, 2-bus rod, I/O-signal acquisition circuit, the CPU-microcontroller, the DRV-IGBT driving circuit, IGBT-insulated gate bipolar transistor, PLW-current drainage input terminal, the VD1-first rectification rectifier diode, the VD2-second rectification rectifier diode, VD3-the 3rd rectification rectifier diode, R1-first permanent resistor, R2-copped wave resistance, R3-the 3rd permanent resistor, R4-the 4th permanent resistor, R5-the 5th permanent resistor, C1-first electric capacity, C2-second electric capacity, C3-the 3rd electric capacity, RV1-first pizo-resistance, RV2-second pizo-resistance, SV1-first voltage sensor, SV2-second voltage sensor, SC1-first current sensor, SC2-second current sensor, SC3-the 3rd current sensor, the quick fuse of FU1-first direct current, the quick fuse of FU2-second direct current.
The specific embodiment
Now in conjunction with the accompanying drawings the specific embodiment of the present invention is described further.
Metro stray current drainage device comprises current drainage input terminal PLW, bus rod 2, control circuit, the current drainage circuit that links to each other with control circuit,
Described control circuit comprises reference electrode 1, the signal acquisition circuit I/O that links to each other with reference electrode 1, the microcontroller CPU that links to each other with signal acquisition circuit I/O mouth, the IGBT driving circuit DRV that links to each other with microcontroller CPU, and described signal acquisition circuit I/O comprises the voltage signal acquisition circuit;
Described current drainage circuit comprise contain adjustable current-limiting resistance and be connected in current drainage input terminal PLW and bus rod 2 between the current drainage branch road, described adjustable current-limiting resistance is composed in parallel by insulated gate bipolar transistor IGBT and copped wave resistance R 2, and wherein: current drainage input terminal PLW links to each other with the input end of voltage signal acquisition circuit among the signal acquisition circuit I/O; The grid of insulated gate bipolar transistor IGBT links to each other with IGBT driving circuit DRV, and copped wave resistance R 2 is connected in parallel on the emitter and collector of insulated gate bipolar transistor IGBT.
As shown in Figure 2, described microcontroller CPU comprises microprocessor chip U1, and microprocessor chip U1 links to each other with program store U3 by data latches U2, and microprocessor chip U1 also disposes correspondent peripheral circuit.
As shown in Figure 1, metro stray current drainage device in use, current drainage input terminal PLW links to each other with current drainage web frame steel, bus rod 2 links to each other with rectifier negative pole in the traction substation, the negative earth of reference electrode 1 (when specifically implementing, reference electrode is a galvanic battery).At subway power supply net electricity failure at night, when locomotive was out of service, it was the current potential at current drainage input terminal PLW place and the current potential of reference electrode 1 that the voltage signal acquisition circuit in the signal acquisition circuit is gathered current drainage web frame steel.
As shown in Figure 3, the voltage signal acquisition circuit adopts isolation op amp U4, op amp U6 to realize electric potential signal collection enlarging function.The input end JG4 input of the isolation op amp U4 of the electric potential signal at current drainage input terminal PLW place from the voltage signal acquisition circuit; The input end CAN4 input of the isolation op amp U4 of the current potential of reference electrode 1 from the voltage signal acquisition circuit.Isolating op amp U4 can carry out electromagnetic isolation with the signal of input end, avoids introducing electromagnetic interference to controller, has strengthened the electromagnetic compatibility of drain means controller.When stopping night, the voltage signal acquisition circuit will collect this two places current potential amplifying signal and be transferred to microcontroller CPU, get their difference via microcontroller CPU internal program, this difference claims first polarization potential of current drainage web frame steel, and this first polarization potential is recorded in the microcontroller CPU, this first polarization potential is as the reference potential of regulating the IGBT dutycycle.When train normally moves, it is the current potential at current drainage input terminal PLW place and the current potential of reference electrode 1 that the voltage signal acquisition circuit is gathered current drainage web frame steel, and this two places electric potential signal is transferred to microcontroller CPU, get their difference via microcontroller CPU internal program, this difference claims second polarization potential of current drainage web frame steel, and this second polarization potential is recorded in the microcontroller CPU.
After microcontroller CPU obtains first polarization potential and the second polarization potential value, dependent program computing in microcontroller CPU, get the difference of second polarization potential and first polarization potential, when this difference during greater than 0.5V (0.5V herein is the higher limit that the GB regulation causes corrosion), microcontroller CPU will send control wave, DRV makes the IGBT conducting by the IGBT driving circuit, and differ magnitude relationship according to this difference and 0.5V, predefined Automatic Program calculates the dutycycle of required insulated gate bipolar transistor IGBT in microcontroller CPU, and send control signal according to the pulse generator program in the microcontroller CPU, change the dutycycle of insulated gate bipolar transistor IGBT by IGBT driving circuit DRV, and carry out the high speed DC chopped-wave as the performer of current control, thereby change the resistance of current-limiting resistance with insulated gate bipolar transistor IGBT.
In the subway operational process, the polarization potential 2 of the polarization potential 1 of current drainage web frame steel and current drainage web frame steel constantly changes, the voltage signal acquisition circuit is by gathering in real time current drainage web frame steel first polarization potential and second polarization potential, and should dynamic first polarization potential and the second polarization potential value send in the microcontroller CPU.Dependent program computing in microcontroller CPU, get the dynamic difference between second polarization potential and first polarization potential, microcontroller CPU according to predefined program with the magnitude relationship between this dynamic difference and the 0.5V, automatically calculate the dutycycle of required insulated gate bipolar transistor IGBT, and send control signal according to the pulse generator program in the microcontroller CPU, automatically change the dutycycle of insulated gate bipolar transistor IGBT by IGBT driving circuit DRV, and use insulated gate bipolar transistor IGBT to carry out the high speed DC chopped-wave as the performer of current control, the dutycycle of dynamic insulated gate bipolar transistor IGBT will produce different current-limiting resistance values, thereby according to the voltage that constantly changes on the current drainage web frame steel, automatically change the resistance of current-limiting resistance, thereby automatically current-limiting resistance is regulated, made the current drainage process reach perfect condition.
Because of the long-play of subway, the current potential instability of reference electrode 1, along with the increase of its period of service, its current potential is decayed gradually.After reference electrode 1 current potential decays to a certain degree gradually, its particularity as the compared potential of current drainage web frame steel current potential reduces, the particularity of dutycycle that microcontroller CPU calculates the insulated gate bipolar transistor IGBT of variation descends, thereby the resistance that causes the current-limiting resistance that changes is inaccuracy also, causes the current drainage effect undesirable.
For addressing the above problem, the another kind of reference electrode acquisition of signal mode of design is current drainage web frame steel and rectifier negative pole current potential operation scheme on this device, this mode also is parallel with the first voltage sensor SV, 1 described signal acquisition circuit and also comprises the voltage and current signal programmable amplifier at current drainage branch road two ends, wherein: the mouth of the first voltage sensor SV1 links to each other with the input end of voltage and current signal programmable amplifier among the signal acquisition circuit I/O.It is promptly reflux magnitude of voltage between the bus 2 of current drainage input terminal PLW and rectifier negative pole that the first voltage sensor SV1 gathers current drainage web frame steel in real time, the input end V1CPU input of this voltage signal voltage and current signal programmable amplifier from signal acquisition circuit I/O.The effect of described voltage and current signal programmable amplifier is that the voltage and current signal of importing is carried out processing and amplifying, and its circuit structure is that those skilled in the art realize easily.In this specific embodiment, as shown in Figure 4, voltage and current signal programmable amplifier in the signal acquisition circuit is made up of multicircuit switch U9, U10 and precision operational-amplifier U11, by programming control gating unlike signal acquisition channel and different signal amplification factor, carry out the A/D conversion after the small voltage signal can being amplified again, adopt programmable amplifying circuit to carry out acquisition of signal, can improve the precision of acquisition of signal greatly.This voltage signal is transferred to microcontroller CPU after the voltage and current signal programmable amplifier amplifies, microcontroller CPU compares this voltage and the VREF (Voltage Reference) (this VREF (Voltage Reference) is set at 5V usually) that is set in advance in the program, microcontroller CPU is according to this magnitude of voltage and preestablish magnitude relationship between the VREF (Voltage Reference) 5V, automatically calculate the dutycycle of required insulated gate bipolar transistor IGBT, and send control signal according to the pulse generator program in the microcontroller CPU, change the dutycycle of insulated gate bipolar transistor IGBT by IGBT driving circuit DRV, and use insulated gate bipolar transistor IGBT to carry out the high speed DC chopped-wave, thereby change the resistance of current-limiting resistance as the performer of current control.Wherein, the big I of above-mentioned VREF (Voltage Reference) 5V is made amendment by the program in the microcontroller CPU.
According to operating experience, there is about 10 times relation in " the structural steel polarization potential promptly causes corrosion greater than 0.5V " of the VREF (Voltage Reference) difference in this operation scheme and GB regulation, promptly causes corrosion during greater than 5 volts when current drainage net and rectifier negative electricity pressure reduction.
In service, when reference electrode 1 current potential is decayed gradually, so that when very seriously influencing microcontroller CPU and calculating the particularity of required insulated gate bipolar transistor IGBT dutycycle thus, can be provided with by microcontroller CPU, select this kind operation scheme for use.This operation scheme is a kind of reserve operation mode after reference electrode damages or finishes natural life-span.Like this, make stray current drainage device can adopt current drainage web frame steel polarization potential and current drainage web frame steel and two kinds of mutual received shipments of mode of rectifier negative pole current potential capable, make the use of drain means more reliable.
For improving the function of stray current drainage device, metro stray current drainage device also comprises the ground connection branch road that links to each other with bus rod 2, after the described ground connection branch road resistance capaciting absorpting circuit that to be the rectifier that composed in parallel by the second rectifier diode VD2 and the 3rd rectifier diode VD3 be composed in series with the 5th resistance R 5 and the 3rd capacitor C 3 is in parallel with the 3rd permanent resistor R3, the second current sensor SC2, after the quick fuse FU2 of second direct current series connection again with the second voltage sensor SV2, the circuit that the second pizo-resistance RV2 composes in parallel, wherein: the mouth of the second current sensor SC2, the mouth of the second voltage sensor SV2, the mouth of the quick fuse FU2 of second direct current links to each other with the input end of voltage and current signal programmable amplifier among the signal acquisition circuit I/O.
In use, the second rectification rectifier diode VD2, the positive pole of the 3rd rectification rectifier diode VD3 links to each other with DC earthing net in the traction substation, when the equipment short circuit in this traction substation, produce fault current, it is bigger to hinder electric current for some reason, so second rectification rectifier diode VD2 on the ground connection branch road, it is big that the capacity of the first rectification rectifier diode VD1 on the relative current drainage branch road of the capacity of the 3rd rectification rectifier diode VD3 is wanted, the second current sensor SC2 on it, the capacity of the quick fuse FU2 of second direct current is also correspondingly bigger, the online stray current of electric current on the ground connection branch road and current drainage converges on bus rod 2, flows to the negative pole of rectifier in the traction substation afterwards.
Software in the microcontroller CPU can be provided with the higher limit of ground connection branch current and hold time, the second current sensor SC2 will detect actual flow and cross the input end I1CPU input of the electric current of this branch road through voltage and current signal programmable amplifier among the signal acquisition circuit I/O, after amplifying, this voltage and current signal programmable amplifier is transferred to microcontroller CPU, judgement through microcontroller CPU internal program, when the electric current of crossing this branch road when actual flow surpassed this settings current value and surpasses the holding time of setting, microcontroller CPU sent alerting signal.When over voltage occurring on the ground connection branch road, the second pizo-resistance RV2 protects branch road.The second voltage sensor SV2 passes through the voltage of its detection the input end V1CPU input of voltage and current signal programmable amplifier among the signal acquisition circuit I/O in real time, this voltage and current signal programmable amplifier carries out the current signal of second voltage sensor SV2 output to be transferred to microcontroller CPU after the I/U conversion is amplified, thereby microcontroller CPU can show the voltage on the ground connection branch road in real time.
For improving the function of metro stray current drainage device, metro stray current drainage device also comprises the current drainage circuit protection device, described current drainage circuit protection device comprises the first rectifier diode VD1, the first permanent resistor R1, the first current sensor SC1, the quick fuse FU1 of first direct current that is connected on the current drainage branch road, and wherein: the two ends of the first rectifier diode VD1 are parallel with the resistance capaciting absorpting circuit that is composed in series by the 4th permanent resistor R4 and first capacitor C 1; The current drainage circuit protection device also comprises the first pizo-resistance RV1 in parallel with the first voltage sensor SV1; The current drainage circuit protection device also comprises second capacitor C 2 that is connected in parallel on copped wave resistance R 2 two ends; The current drainage circuit protection device also comprises the 3rd current sensor SC3 that is connected on the bus rod 2, and wherein: the mouth of the first current sensor SC1, the 3rd current sensor SC3, the quick fuse FU1 of first direct current links to each other with the input end of voltage and current signal programmable amplifier among the signal acquisition processing circuit I/O.
The serial connection first permanent resistor R1 can prevent effectively that adjustable current-limiting resistance value from setting to zero on the current drainage branch road, thereby near the polarization potential of the current drainage net avoiding refluxing a little can not cause " current drainage " problem less than 0.5V or near zero.The serial connection first rectifier diode VD1 can guarantee that stray current flows to bus rod 2 from current drainage input terminal PLW all the time on the current drainage branch road.When the first rectifier diode VD1 both end voltage was too high, the R4C1 resistance capaciting absorpting circuit can effectively be protected this first rectifier diode VD1; When the IGBT both end voltage was too high, C2 can effectively protect IGBT.
In use, software in the microcontroller CPU can be provided with the higher limit of this current drainage branch current, the first current sensor SC 1 will detect actual flow and cross the electric current of this branch road through being transferred to microcontroller CPU after the amplification of voltage and current signal programmable amplifier among the signal acquisition circuit I/O, judgement through microcontroller CPU internal program, when the electric current of crossing this branch road when actual flow surpassed this settings current value and surpasses the holding time of setting, microcontroller CPU sent alerting signal.When over voltage occurring on the current drainage branch road, the first pizo-resistance RV1 protects branch road; Microcontroller CPU is by taking from the signal of voltage sensor SV1, the first current sensor SC1, the quick fuse FU1 of comprehensive first direct current signal, quick fuse FU1 does not hold disconnected when first direct current, judge through dependent program, when detecting electric current and be less than or equal to zero, can judge that then the first rectifier diode VD1 of this branch road damages.The first voltage sensor SV1 is transferred to microcontroller CPU after in real time the voltage on its detection current drainage branch road being amplified through the voltage and current signal programmable amplifier among the signal acquisition circuit I/O, thereby microcontroller CPU can show the voltage on the current drainage branch road in real time.The 3rd current sensor SC3 is transferred to microcontroller CPU after in real time the total current on the bus rod 2 of its detection being amplified through the voltage and current signal programmable amplifier among the signal acquisition circuit I/O, thereby microcontroller CPU can show the total current value on the bus rod 2 in real time.
Above-mentioned voltage sensor, current sensor all are matured products in the market, and the voltage sensor mouth all links to each other with the voltage input end of voltage and current signal programmable amplifier among the signal acquisition circuit I/O; The mouth of current sensor all links to each other with the current input terminal of voltage and current signal programmable amplifier among the signal acquisition circuit I/O.
This device is also by the signal procedure among the microcontroller CPU, utilize the RS-485 communicating circuit to give superior system with Various types of data signal real-time Transmission such as the dutycycle of each branch current, voltage, current drainage branch road insulated gate bipolar transistor IGBT trigging pulse, the total current on the bus rod 2, the disconnected information of fast appearance, as monitoring of stray current device or electric power monitoring system, the concrete connection between it is that those skilled in the art realize easily.
Metro stray current drainage device can be provided with four above-mentioned electrical structures and the identical current drainage branch road of control principle, satisfies the backflow of the stray current of the up railway roadbed of subway, descending railway roadbed, up sidewall, four groups of current drainage nets collections of descending sidewall respectively.Thereby make subway electric current drain means can be more timely, release effectively, make the current drainage of whole subway system reach perfect condition, it is minimum that thereby the harm that makes stray current drops to, the corrosion that ensures the safe operation of subway and reduce subway structure reinforcing bars along the line is produced is for the safe operation of subway has been created better condition.
Claims (4)
1, a kind of metro stray current drainage device comprises current drainage input terminal (PLW), bus rod (2), it is characterized by: the current drainage circuit that described metro stray current drainage device comprises control circuit, links to each other with control circuit,
Described control circuit comprises reference electrode (1), the signal acquisition circuit (I/O) that links to each other with reference electrode (1), the microcontroller (CPU) that links to each other with signal acquisition circuit (I/O) mouth, the IGBT driving circuit (DRV) that links to each other with microcontroller (CPU), and described signal acquisition circuit (I/O) comprises the voltage signal acquisition circuit;
Described current drainage circuit comprise contain adjustable current-limiting resistance and be connected in current drainage input terminal (PLW) and bus rod (2) between the current drainage branch road, described adjustable current-limiting resistance is composed in parallel by insulated gate bipolar transistor (IGBT) and copped wave resistance (R2), and wherein: current drainage input terminal (PLW) links to each other with the input end of voltage signal acquisition circuit in the signal acquisition circuit (I/O); The grid of insulated gate bipolar transistor (IGBT) links to each other with IGBT driving circuit (DRV).
2, metro stray current drainage device according to claim 1 is characterized by: described current drainage branch road two ends also are parallel with first voltage sensor (SV1); Described signal acquisition circuit also comprises the voltage and current signal programmable amplifier, and wherein: the mouth of first voltage sensor (SV1) links to each other with the input end of voltage and current signal programmable amplifier in the signal acquisition circuit (I/O).
3, metro stray current drainage device according to claim 2, it is characterized by: also comprise the ground connection branch road that links to each other with bus rod (2), after the described ground connection branch road resistance capaciting absorpting circuit that to be the rectifier that composed in parallel by second rectifier diode (VD2) and the 3rd rectifier diode (VD3) be composed in series with the 5th resistance (R5) and the 3rd electric capacity (C3) is in parallel with the 3rd permanent resistor (R3), second current sensor (SC2), after the quick fuse of second direct current (FU2) series connection again with second voltage sensor (SV2), the circuit that second pizo-resistance (RV2) composes in parallel, wherein: the mouth of second current sensor (SC2), the mouth of second voltage sensor (SV2), the mouth of the quick fuse of second direct current (FU2) links to each other with the input end of voltage and current signal programmable amplifier in the signal acquisition circuit (I/O).
4, according to claim 2 or 3 described metro stray current drainage devices, it is characterized by: it also comprises the current drainage circuit protection device, described current drainage circuit protection device comprises first rectifier diode (VD1), first permanent resistor (R1), first current sensor (SC1), the quick fuse of first direct current (FU1) that is connected on the current drainage branch road, and wherein: the two ends of first rectifier diode (VD1) are parallel with the resistance capaciting absorpting circuit that is composed in series by the 4th permanent resistor (R4) and first electric capacity (C1); The current drainage circuit protection device also comprises first pizo-resistance (RV1) in parallel with first voltage sensor (SV1); The current drainage circuit protection device also comprises second electric capacity (C2) that is connected in parallel on copped wave resistance (R2) two ends; The current drainage circuit protection device also comprises the 3rd current sensor (SC3) that is connected on the bus rod (2), and wherein: the mouth of first current sensor (SC1), the 3rd current sensor (SC3), the quick fuse of first direct current (FU1) links to each other with the input end of voltage and current signal programmable amplifier in the signal acquisition processing circuit (I/O).
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| CN102419558A (en) * | 2011-11-15 | 2012-04-18 | 深圳市华力特电气股份有限公司 | Metro stray current one-way conduction control method, and device for the same |
| CN102508018A (en) * | 2011-11-10 | 2012-06-20 | 上海电机学院 | Stray current monitoring and protecting device and method |
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| CN110093611A (en) * | 2019-05-20 | 2019-08-06 | 中国民航大学 | A kind of energy-saving and environment-friendly stray current drainage device |
| CN110217136A (en) * | 2019-05-29 | 2019-09-10 | 北京城建信捷轨道交通工程咨询有限公司 | A kind of method and monitoring device for protecting metro stray current |
| CN111596331A (en) * | 2020-04-17 | 2020-08-28 | 中铁建电气化局集团南方工程有限公司 | Comprehensive testing system and method for traction reflux and steel rail potential of electrified railway |
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| CN102508018A (en) * | 2011-11-10 | 2012-06-20 | 上海电机学院 | Stray current monitoring and protecting device and method |
| CN102419558A (en) * | 2011-11-15 | 2012-04-18 | 深圳市华力特电气股份有限公司 | Metro stray current one-way conduction control method, and device for the same |
| CN102419558B (en) * | 2011-11-15 | 2014-04-16 | 深圳市华力特电气股份有限公司 | Metro stray current one-way conduction control method, and device for the same |
| CN102529749A (en) * | 2012-01-06 | 2012-07-04 | 徐州润泽电气有限公司 | Automatic current drainage cabinet |
| CN102692885A (en) * | 2012-05-15 | 2012-09-26 | 西安理工大学 | Monitoring drainage control method of stray current |
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| CN106025989A (en) * | 2016-02-02 | 2016-10-12 | 江苏省电力公司南京供电公司 | Radiation-proof subway tunnel structure for laying of high-voltage cable |
| CN105842528A (en) * | 2016-05-23 | 2016-08-10 | 南京大全自动化科技有限公司 | Collection device for subway stray current |
| 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 |
| CN109066643A (en) * | 2018-09-29 | 2018-12-21 | 成都中工电气工程有限公司 | A kind of novel steel rail potential limiting device |
| CN109066643B (en) * | 2018-09-29 | 2024-01-30 | 成都中工电气工程有限公司 | Rail potential limiting device |
| CN110093611A (en) * | 2019-05-20 | 2019-08-06 | 中国民航大学 | A kind of energy-saving and environment-friendly stray current drainage device |
| CN110093611B (en) * | 2019-05-20 | 2021-06-15 | 中国民航大学 | Energy-saving and environment-friendly stray current drainage device |
| CN110217136A (en) * | 2019-05-29 | 2019-09-10 | 北京城建信捷轨道交通工程咨询有限公司 | A kind of method and monitoring device for protecting metro stray current |
| CN111596331A (en) * | 2020-04-17 | 2020-08-28 | 中铁建电气化局集团南方工程有限公司 | Comprehensive testing system and method for traction reflux and steel rail potential of electrified railway |
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