CN104216452A - Pipe-to-soil potential excessively-negative control method and device for buried pipeline - Google Patents
Pipe-to-soil potential excessively-negative control method and device for buried pipeline Download PDFInfo
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- CN104216452A CN104216452A CN201310220140.5A CN201310220140A CN104216452A CN 104216452 A CN104216452 A CN 104216452A CN 201310220140 A CN201310220140 A CN 201310220140A CN 104216452 A CN104216452 A CN 104216452A
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Abstract
The invention relates to a pipe-to-soil potential excessively-negative control method and device for a buried pipeline which suffers from DC spurious emission interference. A voltage reference source is used as a signal collecting comparison and triggering control circuit to trigger and control a based threshold value; when the pipe-to-soil potential collected by the signal collecting comparison and triggering control circuit A02 exceeds the specified value of the threshold value, an operational amplifier in the circuit outputs in the forward direction, a photoelectric coupler is triggered and connected, and a reverse compensation control circuit A03 is triggered to start applying a forward current to the pipeline; when the pipe-to-soil potential collected by the signal collecting comparison and triggering control circuit A02 has already returned within the allowed range of the set threshold value, the operational amplifier is free of output, the photoelectric coupler is not triggered, optoelectronic isolation takes effect, trigger control is canceled, and the reverse compensation control circuit A03 stops working. The pipe-to-soil potential excessively-negative phenomenon due to the fact that the pipeline suffers from DC interference is avoided, and the hydrogen brittleness and coating stripping danger of the pipeline can be eliminated.
Description
Technical field
The present invention is that a kind of solution suffers the buried pipeline pipe-to-soil potential of direct current clutter interference to cross negative control method and device.Relate to piping system technical field.
Background technology
In recent years, along with the High Speed Construction of the fast rail in city and HVDC (High Voltage Direct Current) transmission line and oil and gas pipes, their intersecting with buried oil and gas pipes, parallel phenomenon get more and more, and the energy " public corridor " is more and more general.But the electric field environment of DC power transmission line, unusual service condition are run and ground connection is arranged, and all can DC stray current be caused to disturb by the buried steel pipeline contiguous to it using direct current as the light rail systems of driving source etc., shuffle at the region pipe-to-soil potential of outflow of bus current piping system (returning stray current interference source) and corrode, and cause pipeline current potential excessively negative in the region of electric current flow ipe system, easily bring out the adverse effects such as pipe line steel generation hydrogen embrittlement, corrosion-inhibiting coating stripping.The pipeline pipe-to-soil potential caused for the defective insulation due to the dynamic change of urban light rail even load and rail and ground crosses negative problem, there is no effective preventing control method and device.
At present, if protection DC influence is on the main drainage protection of mode of its contiguous buried pipeline impact, although have direct electric drainage, forced electrical drainage, directional drainage and electric drainage by grounding four kinds of modes; But due to the domestic coordination system being only the national conditions such as the one-sided protection in the side of being disturbed and lacking electrical Interference, substantially adopt electric drainage by grounding at present.In the region that there is dynamic disturbance, for preventing the reverse flow ipe of stray current, supvr generally passes through to install counterflow-preventing device (conventional diode), i.e. polarity electric drainage by grounding in electric drainage by grounding loop.Although the annoyance level that pipeline suffers can significantly weaken by above-mentioned control method and device, solve the pipe-to-soil potential forward migration problem that DC influence causes, the problem that pipe-to-soil potential is born excessively cannot be solved, the problem of namely usually said " row is not just arranging negative ".In addition, because long-distance oil & gas pipeline field condition does not have utilizable power supply to arrange, need power consumption and the self-powered problem of considering control device when drainage controls, and the detection of pipe-to-soil potential is fed back and controlled the problems such as Trigger Efficiency.
CN2779412Y discloses a kind of Multi-channel measurement device for AC/DC interference in pipeline, and CN1456879A discloses a kind of pipeline pipe-to-soil potential and surface potential method for comprehensive detection of cathodic protection, but and the problem excessively born of unresolved pipe-to-soil potential.
Summary of the invention
The object of the invention is to invent a kind of protection cause because pipeline suffers DC influence pipe-to-soil potential excessively negative, solve pipeline hydrogen embrittlement, the buried pipeline pipe-to-soil potential of coating stripping risk crosses negative control method and device.
Utilize collection tube earth potential, and set threshold values with voltage-reference and compare, determine whether the Contrary compensation needing to implement to apply forward current to pipeline; Pipeline potential acquisition and feedback continue to carry out simultaneously, and constantly compare feedback with setting threshold values, if pipe-to-soil potential has been got back in the threshold values allowed band of setting, Contrary compensation stops.In pipe-to-soil potential collection relatively subsequently, if exceed threshold values to restart Contrary compensation.And so forth.
The technical solution adopted in the present invention is: first set up three relatively independent circuit: voltage reference source circuit, signals collecting compare and trigger control circuit and Contrary compensation control circuit (see figure 2).Voltage-reference compares the threshold values with trigger control circuit trigging control institute foundation as signals collecting.When signals collecting compare the pipe-to-soil potential gathered with trigger control circuit exceed threshold values setting time, operational amplifier forward in this circuit exports, photoelectric coupling conducting, triggers Contrary compensation control circuit and starts to apply forward current to pipeline; Until the pipe-to-soil potential that signals collecting and comparator circuit gather has been got back to when setting in threshold values allowed band, operational amplifier no-output, Phototube Coupling has come into force, and trigging control is cancelled, and Contrary compensation control circuit quits work.
The flow process of control method of the present invention as shown in Figure 1.Its flow process is:
Gather and compare pipe-to-soil potential;
Exceed reference source setting threshold values to judge? as "No", then photoelectrical coupler does not trigger, and Contrary compensation control system quits work; As "Yes", then photoelectrical coupler triggers, and Contrary compensation control system works;
Be applied to buried pipeline system.
Damaging some components and parts of circuit to prevent positive voltage from flowing into Contrary compensation control circuit from pipeline, adding anti-return controller at the afterbody with pipeline associated electronic circuitry.Flow process becomes after the work of Contrary compensation control system: the conducting of anti-return controller; Be applied to buried pipeline system.
Buried pipeline pipe-to-soil potential crosses the principle of negative control device as shown in Figure 2.The output of voltage reference primary circuit connects signals collecting and compares and trigger control circuit, and signals collecting compare with trigger control circuit constantly and buried pipeline system carry out signals collecting and the signal feedback of pipe-to-soil potential, signals collecting compares to export with trigger control circuit and controls to connect Contrary compensation control circuit through photoelectric coupling, Contrary compensation control circuit exports and takes over control counter flow controller, anti-return controller exports and connects buried pipeline system, the diode of anti-return controller inside to control between anti-return controller and buried pipeline system whether current lead-through according to direction of current.
Buried pipeline pipe-to-soil potential crosses the circuit theory of negative control device as shown in Figure 3, the positive pole of power supply I P1 is connected with one end of divider resistance R1, the other end of divider resistance R1 respectively with the positive terminal of polar capacitor C1, one end of adjustable resistor R2, and three end adjustable shunt reference source T1 K end and R hold be connected, the negative pole end of power supply I P1 is held with the negative pole end of polar capacitor C1, the A of three end adjustable shunt reference source T1 respectively, and the other end of adjustable resistor R2 is connected.The regulation output end of adjustable resistor R2 is connected with the reverse input end of operational amplifier A R1, the positive input of operational amplifier A R1 and CuSO
4contrast electrode L1 is connected, the output terminal of AR1 operational amplifier is connected with the input end of photoelectrical coupler U2, the straight-through output terminal of photoelectrical coupler U2 is connected with three earth terminals rectifying voltage output controller U1 with the negative pole of power supply II P2 respectively, the positive pole of power supply II P2 is connected with three input ends rectifying voltage output controller U1, and three output terminals rectifying voltage output controller U1 are connected with the output terminal of buried pipeline system L2 and anti-return controller U5.The negative pole of power supply III P3 is connected with three earth terminals rectifying voltage output controller U3, and ground connection; The positive pole of power supply III P3 rectifies the input end of voltage output controller U3 with three respectively, the D of field effect transistor U4 hold and is connected and one end of current-limiting resistance R3, and the S of field effect transistor U4 holds and is connected with the input end of anti-return controller U5; The G end of field effect transistor U4 is extremely connected with the control of bipolar transistor Q1 with the other end of current-limiting resistance R3, the grounded emitter of bipolar transistor Q1; Three output terminals rectifying voltage output controller U3 are connected with the couple input of photoelectrical coupler U2, the coupled output of photoelectrical coupler U2 is connected with one end of current-limiting resistance R5 with one end of divider resistance R4 respectively, the other end of divider resistance R4 is connected with the base stage of bipolar transistor Q1, and the other end of current-limiting resistance R5 is connected with ground connection groundbed L3.
Fig. 4 is the circuit theory diagrams of anti-return controller U5, and one end of inductance L 4 is held with the S of field effect transistor U4 and is connected, and the other end of inductance L 4 is connected with the positive pole section of polar capacitor C2 with one end of inductance L 5 respectively; The other end of inductance L 5 is connected with one end of inductance L 6 and the positive terminal of polar capacitor C3 respectively; The other end of inductance L 6 is connected with 3 with the positive terminal of polar capacitor C4, the pin 1 of MBR2545 integrated circuit (IC) chip respectively; The negative pole end of polar capacitor C2, C3, C4 connects together, and ground connection; The pin 2 of three pin MBR2545 integrated circuit (IC) chip is connected with buried pipeline system L2.
The beneficial effect that the present invention reaches:
(1) the self-powered modes such as power storage cell can be adopted to solve the problem of long distance pipeline field without power supply;
(2) instantaneous large interference problem can be solved by multiple spot compensation way;
(3) plant bulk is little, and I&M is convenient;
(4) control of discontinuity dynamic disturbance is particularly suitable for.
Accompanying drawing explanation
The process flow diagram of Fig. 1 control method
Fig. 2 buried pipeline pipe-to-soil potential crosses negative control principle of device block diagram
Fig. 3 buried pipeline pipe-to-soil potential crosses negative control device circuit schematic diagram
The circuit theory diagrams of Fig. 4 anti-return controller
Embodiment
Embodiment. below in conjunction with accompanying drawing, invention is further described.This example is experimental prototype, and buried pipeline pipe-to-soil potential crosses the principle of negative control device as shown in Figure 2.The output of voltage reference primary circuit connects signals collecting and compares and trigger control circuit, and signals collecting compare with trigger control circuit constantly and buried pipeline system carry out signals collecting and the signal feedback of pipe-to-soil potential, , signals collecting compares to export with trigger control circuit and controls to connect Contrary compensation control circuit through photoelectric coupling, Contrary compensation control circuit exports and takes over control counter flow controller, anti-return controller exports and connects buried pipeline system, the diode of anti-return controller inside to control between anti-return controller and buried pipeline system whether current lead-through according to direction of current.
The circuit theory of device as shown in Figure 3.The positive pole of power supply I P1 is connected with one end of divider resistance R1, the other end of divider resistance R1 respectively with the positive terminal of polar capacitor C1, one end of adjustable resistor R2, and three end adjustable shunt reference source T1 K end and R hold be connected, the negative pole end of power supply I P1 is held with the negative pole end of polar capacitor C1, the A of three end adjustable shunt reference source T1 respectively, and the other end of adjustable resistor R2 is connected.The regulation output end of adjustable resistor R2 is connected with the reverse input end of operational amplifier A R1, the positive input of operational amplifier A R1 and CuSO
4contrast electrode L1 is connected, the output terminal of AR1 operational amplifier is connected with the input end of photoelectrical coupler U2, the straight-through output terminal of photoelectrical coupler U2 is connected with three earth terminals rectifying voltage output controller U1 with the negative pole of power supply II P2 respectively, the positive pole of power supply II P2 is connected with three input ends rectifying voltage output controller U1, and three output terminals rectifying voltage output controller U1 are connected with the output terminal of buried pipeline system L2 and anti-return controller U5.The negative pole of power supply III P3 is connected with three earth terminals rectifying voltage output controller U3, and ground connection; The positive pole of power supply III P3 rectifies the input end of voltage output controller U3 with three respectively, the D of field effect transistor U4 hold and is connected and one end of current-limiting resistance R3, and the S of field effect transistor U4 holds and is connected with the input end of anti-return controller U5; The G end of field effect transistor U4 is extremely connected with the control of bipolar transistor Q1 with the other end of current-limiting resistance R3, the grounded emitter of bipolar transistor Q1; Three output terminals rectifying voltage output controller U3 are connected with the couple input of photoelectrical coupler U2, the coupled output of photoelectrical coupler U2 is connected with one end of current-limiting resistance R5 with one end of divider resistance R4 respectively, the other end of divider resistance R4 is connected with the base stage of bipolar transistor Q1, and the other end of current-limiting resistance R5 is connected with ground connection groundbed L3.
The circuit theory of anti-return controller as shown in Figure 4, hold with the S of field effect transistor U4 and be connected by one end of inductance L 4, and the other end of inductance L 4 is connected with the positive pole section of polar capacitor C2 with one end of inductance L 5 respectively; The other end of inductance L 5 is connected with one end of inductance L 6 and the positive terminal of polar capacitor C3 respectively; The other end of inductance L 6 is connected with 3 with the positive terminal of polar capacitor C4, the pin 1 of MBR2545 integrated circuit (IC) chip respectively; The negative pole end of polar capacitor C2, C3, C4 connects together, and ground connection; The pin 2 of three pin MBR2545 integrated circuit (IC) chip is connected with buried pipeline system L2.
In the implementation case,
Power supply I P1 selects the constant-voltage exporting 5V;
Divider resistance R1 is 100 Ω;
Polar capacitor C1 is 100 μ F;
Three end adjustable shunt reference source T1 are TL431;
Adjustable resistor R2 resistance is 200 Ω, and regulates the regulation output end of adjustable resistor R2 to make the voltage of its relative to ground CuSO4 contrast electrode L1 remain on-1.2V;
The model of operational amplifier A R1 is Op07;
The compact power of power supply II P2 to be output voltage be 10V;
Three proper voltage output controller I U1 models are LM7805;
Buried pipeline system L2 is the φ 720mm pipeline being applied with cathodic protection;
The compact power of voltage III P3 to be output voltage be 10V;
Three proper voltage output controller II U3 models are LM7805;
The model of field effect transistor U4 is IRF4905;
The resistance of current-limiting resistance R3 is 1000 Ω;
The model of computing photoelectrical coupler U2 is 6N137;
The resistance of divider resistance R4 is 2000 Ω;
Bipolar transistor Q1 model is TO-226-AA NPN transistor;
The resistance of current-limiting resistance IIR5 is 10000 Ω;
Groundbed L3 material is ferrosilicon anode;
Inductance L 4, inductance L 5 and inductance L 6 are 330 μ H;
Polar capacitor C2, polar capacitor C3 and polar capacitor C4 are 470 μ F;
U6 is three pin MBR2545 integrated circuit (IC) chip of two diodes in parallel.
The flow process of this routine control method as shown in Figure 1.Its flow process is:
Gather and compare pipe-to-soil potential;
Exceed reference source setting threshold values to judge? as "Yes", then through photoelectric coupling, Contrary compensation control system works; The conducting of anti-return controller; Be applied to buried pipeline system; As "No", then through Phototube Coupling, Contrary compensation control system quits work.
This example, through test, can adopt the self-powered modes such as power storage cell to solve the problem of long distance pipeline field without power supply; Instantaneous large interference problem is solved by multiple spot compensation way; Plant bulk is little, and I&M is convenient; Be particularly suitable for the control of discontinuity dynamic disturbance.
Claims (5)
1. buried pipeline pipe-to-soil potential crosses a negative control method, it is characterized in that first setting up three relatively independent circuit: voltage reference source circuit A01, signals collecting compare and trigger control circuit A02 and Contrary compensation control circuit A03; Voltage-reference compares the threshold values with trigger control circuit trigging control institute foundation as signals collecting; When signals collecting compare the pipe-to-soil potential gathered with trigger control circuit A02 exceed threshold values setting time, operational amplifier forward in this circuit exports, and photoelectrical coupler triggers and conducting, triggers Contrary compensation control circuit and starts to apply forward current to pipeline; Until the pipe-to-soil potential that signals collecting and comparator circuit A02 gather has been got back to when setting in threshold values allowed band, operational amplifier no-output, photoelectrical coupler does not trigger, and Phototube Coupling comes into force, and trigging control is cancelled, and Contrary compensation control circuit quits work; Its flow process is:
Gather and compare pipe-to-soil potential;
Judge whether to exceed voltage-reference setting threshold values? as "No", then photoelectrical coupler does not trigger, and Contrary compensation control system quits work; As "Yes", then photoelectrical coupler triggers, and Contrary compensation control system works;
Be applied to buried pipeline system.
2. buried pipeline pipe-to-soil potential according to claim 1 crosses negative control method, it is characterized in that increasing anti-return controller between Contrary compensation control circuit and buried pipeline system, prevent positive voltage from flowing into Contrary compensation control circuit from pipeline and damaging some components and parts of circuit; Flow process becomes after the work of Contrary compensation control system: the conducting of anti-return controller; Be applied to buried pipeline system.
3. one kind uses the buried pipeline pipe-to-soil potential of method as claimed in claim 1 to cross negative control device, it is characterized in that the principle that buried pipeline pipe-to-soil potential crosses negative control device is: voltage reference primary circuit exports and connects signals collecting and compare and trigger control circuit, and signals collecting compare with trigger control circuit constantly and buried pipeline system carry out signals collecting and the signal feedback of pipe-to-soil potential, signals collecting compares to export with trigger control circuit and controls to connect Contrary compensation control circuit through photoelectric coupling, Contrary compensation control circuit exports and takes over control counter flow controller, anti-return controller exports and connects buried pipeline system, the diode of anti-return controller inside to control between anti-return controller and buried pipeline system whether current lead-through according to direction of current.
4. buried pipeline pipe-to-soil potential according to claim 3 crosses negative control device, it is characterized in that the electric principle of equipment therefor is: the positive pole of power supply I P1 is connected with one end of divider resistance R1, the other end of divider resistance R1 respectively with the positive terminal of polar capacitor C1, one end of adjustable resistor R2, and three end adjustable shunt reference source T1 K end and R hold be connected, the negative pole end of power supply I P1 is held with the negative pole end of polar capacitor C1, the A of three end adjustable shunt reference source T1 respectively, and the other end of adjustable resistor R2 is connected; The regulation output end of adjustable resistor R2 is connected with the reverse input end of operational amplifier A R1, the positive input of operational amplifier A R1 and CuSO
4contrast electrode L1 is connected, the output terminal of AR1 operational amplifier is connected with the input end of photoelectrical coupler U2, the straight-through output terminal of photoelectrical coupler U2 is connected with three earth terminals rectifying voltage output controller U1 with the negative pole of power supply II P2 respectively, the positive pole of power supply II P2 is connected with three input ends rectifying voltage output controller U1, and three output terminals rectifying voltage output controller U1 are connected with the output terminal of buried pipeline system L2 and anti-return controller U5; The negative pole of power supply III P3 is connected with three earth terminals rectifying voltage output controller U3, and ground connection; The positive pole of power supply III P3 rectifies the input end of voltage output controller U3 with three respectively, the D of field effect transistor U4 hold and is connected and one end of current-limiting resistance R3, and the S of field effect transistor U4 holds and is connected with the input end of anti-return controller U5; The G end of field effect transistor U4 is extremely connected with the control of bipolar transistor Q1 with the other end of current-limiting resistance R3, the grounded emitter of bipolar transistor Q1; Three output terminals rectifying voltage output controller U3 are connected with the couple input of photoelectrical coupler U2, the coupled output of photoelectrical coupler U2 is connected with one end of current-limiting resistance R5 with one end of divider resistance R4 respectively, the other end of divider resistance R4 is connected with the base stage of bipolar transistor Q1, and the other end of current-limiting resistance R5 is connected with ground connection groundbed L3.
5. buried pipeline pipe-to-soil potential according to claim 3 crosses negative control device, it is characterized in that increasing anti-return controller between Contrary compensation control circuit and buried pipeline system, the electric principle of anti-return controller is: one end of inductance L 4 is held with the S of field effect transistor U4 and is connected, and the other end of inductance L 4 is connected with the positive pole section of polar capacitor C2 with one end of inductance L 5 respectively; The other end of inductance L 5 is connected with one end of inductance L 6 and the positive terminal of polar capacitor C3 respectively; The other end of inductance L 6 is connected with 3 with the positive terminal of polar capacitor C4, the pin 1 of MBR2545 integrated circuit (IC) chip respectively; The negative pole end of polar capacitor C2, C3, C4 connects together, and ground connection; The pin 2 of three pin MBR2545 integrated circuit (IC) chip is connected with buried pipeline system L2.
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| CN105822907A (en) * | 2016-05-17 | 2016-08-03 | 南方电网科学研究院有限责任公司 | Control method for pipe-to-soil potential of buried metal pipeline |
| CN106130371A (en) * | 2016-07-20 | 2016-11-16 | 广东双核电气有限公司 | The Switching Power Supply that a kind of Intelligent constant power rectification controls |
| CN107863767A (en) * | 2016-09-22 | 2018-03-30 | 中国石油天然气股份有限公司 | Oil-gas pipeline valve chamber earth protective device |
| CN109094427A (en) * | 2018-08-23 | 2018-12-28 | 南京铁道职业技术学院 | Metro stray current based on voltage compensation inhibits system and method |
| CN109941154A (en) * | 2019-03-25 | 2019-06-28 | 中国矿业大学 | A kind of system and method limiting rail voltage |
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| CN109941154A (en) * | 2019-03-25 | 2019-06-28 | 中国矿业大学 | A kind of system and method limiting rail voltage |
| CN109941154B (en) * | 2019-03-25 | 2021-11-19 | 合肥华威自动化有限公司 | System and method for limiting rail voltage |
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