CN104216452B - A kind of buried pipeline pipe-to-soil potential crosses negative control method and device - Google Patents
A kind of buried pipeline pipe-to-soil potential crosses negative control method and device Download PDFInfo
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- CN104216452B CN104216452B CN201310220140.5A CN201310220140A CN104216452B CN 104216452 B CN104216452 B CN 104216452B CN 201310220140 A CN201310220140 A CN 201310220140A CN 104216452 B CN104216452 B CN 104216452B
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Abstract
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. It is that voltage-reference compares and the valve value of trigger control circuit trigging control institute foundation as signals collecting; The pipe-to-soil potential gathered with trigger control circuit A02 is compared when exceeding valve value prescribed value when signals collecting, operational amplifier in this circuit is just to output, photoelectricity coupling mechanism triggers and conducting, triggers Contrary compensation pilot circuit A03 and starts to apply forward current to pipeline; Until when the pipe-to-soil potential that signals collecting and comparison circuit A02 gather has returned in setting valve value allowed band, operational amplifier no-output, photoelectricity coupling mechanism does not trigger, and Phototube Coupling comes into force, and trigging control is cancelled, and Contrary compensation pilot circuit A03 stops work. The present invention's protection causes pipe-to-soil potential excessively negative because pipeline suffers DC influence, can solve pipeline hydrogen embrittlement, coating stripping risk.
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 tubing system technical field.
Background technology
In recent years, along with the High Speed Construction of the fast rail in city and high-voltage dc transmission electric 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 DC stray current can be caused to disturb the buried steel pipeline that it is contiguous using direct current as the light rail systems etc. in excitation source, region pipe-to-soil potential in outflow of bus current tubing system (returning stray current interfering source) is shuffled and is corroded, and cause pipeline current potential excessively negative in the region of electric current inflow tubing system, it is easy to bring out the disadvantageous effects such as pipe line steel generation hydrogen embrittlement, corrosion protection coating stripping. The pipeline pipe-to-soil potential caused for the defective insulation due to urban light rail even load dynamic change 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 the mode of its contiguous buried pipeline impact, although having direct electric drainage, forced electrical drainage, polarity drainage and ground connection drainage four kinds of modes; But it is only the national conditions such as the one-sided protection in the side of being disturbed due to domestic and lack the coordination system of electricinterference, substantially adopt ground connection drainage at present. In the region that there is dynamic disturbance, for preventing the reverse inflow pipeline of stray current, manager generally passes through to install anti-adverse current device (conventional diode) in ground connection drainage loop, i.e. polarity ground connection drainage. Although the annoyance level that pipeline suffers can significantly be weakened by above-mentioned control method and device, solve the pipe-to-soil potential forward migration problem that DC influence causes, but 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, do not have due to long-distance oil & gas pipeline field condition the power supply that can utilize to arrange, need power consumption and the self-powered problem of considering control device when drainage controls, and the detection feedback and control for pipe-to-soil potential triggers the problems such as efficiency.
CN2779412Y discloses a kind of Multi-channel measurement device for AC/DC interference in pipeline, and CN1456879A discloses pipeline pipe-to-soil potential and the surface potential method for comprehensive detection of a kind of galvanic protection, but and the problem excessively born of unresolved pipe-to-soil potential.
Summary of the invention
It is an object of the invention 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 cross negative control method and device.
Utilize collection tube ground potential, and set valve value with voltage-reference and compare, it is determined whether need the Contrary compensation implementing to apply forward current to pipeline; Pipeline potential acquisition and feedback continue to carry out simultaneously, and constantly compare feedback with setting valve value, if pipe-to-soil potential has returned in the valve value allowed band of setting, Contrary compensation stops. In pipe-to-soil potential collection relatively subsequently, if it exceeds valve value restarts 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 pilot circuit (see figure 2). Voltage-reference compares and the valve value of trigger control circuit trigging control institute foundation as signals collecting. Comparing the pipe-to-soil potential gathered with trigger control circuit when signals collecting when exceeding valve value prescribed value, the operational amplifier in this circuit is just to output, and photoelectricity coupling conducting, triggers Contrary compensation pilot circuit and start to apply forward current to pipeline; Until when the pipe-to-soil potential that signals collecting and comparison circuit gather has returned in setting valve value allowed band, operational amplifier no-output, Phototube Coupling comes into force, and trigging control is cancelled, Contrary compensation pilot circuit stopping work.
The flow process that the present invention controls method is as shown in Figure 1. Its flow process is:
Gather and compare pipe-to-soil potential;
Exceed a reference source setting valve value to judge? such as "No", then photoelectricity coupling mechanism does not trigger, Contrary compensation Controlling System stopping work; Such as "Yes", then photoelectricity coupling mechanism triggers, and Contrary compensation Controlling System works;
It is applied to buried pipeline system.
Damage some components and parts of circuit to prevent positive voltage from flowing into Contrary compensation pilot circuit from pipeline, add anti-counter flow controller at the afterbody with pipeline associated electronic circuitry. Flow process turns into after Contrary compensation Controlling System works: anti-counter flow controller conducting; It is applied to buried pipeline system.
The principle that buried pipeline pipe-to-soil potential crosses negative control device is as shown in Figure 2. the output of voltage benchmark primary circuits 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 compare with trigger control circuit export connect Contrary compensation pilot circuit through photoelectricity coupling control, Contrary compensation pilot circuit exports and takes over control counter flow controller, anti-counter flow controller exports and connects buried pipeline system, the diode of anti-counter flow controller inside controls between anti-counter flow controller and buried pipeline system whether current lead-through according to the sense of current.
The circuit principle that buried pipeline pipe-to-soil potential crosses negative control device is as shown in Figure 3, the positive pole of power supply IP1 is connected with one end of point compressive resistance R1, the other end of point compressive resistance R1 respectively with the positive terminal of polar capacitor C1, one end of adjustable resistor R2, and three the K end of end adjustable shunt reference source T1 be connected with R end, the negative pole end of power supply IP1 respectively with the negative pole end of polar capacitor C1, the A end of three end adjustable shunt reference source T1, and the other end of adjustable resistor R2 be connected. The regulation output end of adjustable resistor R2 is connected with the reverse input terminus of operational amplifier A R1, the positive input of operational amplifier A R1 and CuSO4Reference electrode L1 is connected, the output terminal of AR1 operational amplifier is connected with the input terminus of photoelectricity coupling mechanism U2, the straight-through output terminal of photoelectricity coupling mechanism U2 is connected with three ground terminals rectifying voltage output controller U1 with the negative pole of power supply IIP2 respectively, the positive pole of power supply IIP2 is connected with three input terminuss 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-counter flow controller U5. The negative pole of power supply IIIP3 is connected with three ground terminals rectifying voltage output controller U3, and ground connection; The positive pole of power supply IIIP3 rectifies the input terminus of voltage output controller U3 with three respectively, the D end of field effect transistor U4 is connected and one end of current limliting resistance R3, and the S end of field effect transistor U4 is connected with the input terminus of anti-counter flow 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 limliting resistance R3, the grounded emitter of bipolar transistor Q1; Three output terminals rectifying voltage output controller U3 are connected with the couple input of photoelectricity coupling mechanism U2, the coupled output of photoelectricity coupling mechanism U2 is connected with one end of current limliting resistance R5 with dividing one end of compressive resistance R4 respectively, dividing the other end of compressive resistance R4 to be connected with the base stage of bipolar transistor Q1, the other end of current limliting resistance R5 is connected with ground connection groundbed L3.
Fig. 4 is the schematic circuit diagram of anti-counter flow controller U5, and one end of inductance L 4 is connected with the S end of field effect transistor U4, 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 useful 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 big interference problem can be solved by multiple spot compensation way;
(3) device size is little, installs with easy to maintenance;
(4) control of discontinuity dynamic disturbance it is particularly suitable for.
Accompanying drawing explanation
Fig. 1 controls the schema of 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 schematic circuit diagram of the anti-counter flow controller of Fig. 4
Embodiment
Embodiment. below in conjunction with accompanying drawing, invention is further described. this example is experimental prototype, and the principle that buried pipeline pipe-to-soil potential crosses negative control device is as shown in Figure 2. the output of voltage benchmark primary circuits 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 compare with trigger control circuit export connect Contrary compensation pilot circuit through photoelectricity coupling control, Contrary compensation pilot circuit exports and takes over control counter flow controller, anti-counter flow controller exports and connects buried pipeline system, the diode of anti-counter flow controller inside controls between anti-counter flow controller and buried pipeline system whether current lead-through according to the sense of current.
The circuit principle of device is as shown in Figure 3. The positive pole of power supply IP1 is connected with one end of point compressive resistance R1, the other end of point compressive resistance R1 respectively with the positive terminal of polar capacitor C1, one end of adjustable resistor R2, and three the K end of end adjustable shunt reference source T1 be connected with R end, the negative pole end of power supply IP1 respectively with the negative pole end of polar capacitor C1, the A end of three end adjustable shunt reference source T1, and the other end of adjustable resistor R2 be connected. The regulation output end of adjustable resistor R2 is connected with the reverse input terminus of operational amplifier A R1, the positive input of operational amplifier A R1 and CuSO4Reference electrode L1 is connected, the output terminal of AR1 operational amplifier is connected with the input terminus of photoelectricity coupling mechanism U2, the straight-through output terminal of photoelectricity coupling mechanism U2 is connected with three ground terminals rectifying voltage output controller U1 with the negative pole of power supply IIP2 respectively, the positive pole of power supply IIP2 is connected with three input terminuss 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-counter flow controller U5. The negative pole of power supply IIIP3 is connected with three ground terminals rectifying voltage output controller U3, and ground connection; The positive pole of power supply IIIP3 rectifies the input terminus of voltage output controller U3 with three respectively, the D end of field effect transistor U4 is connected and one end of current limliting resistance R3, and the S end of field effect transistor U4 is connected with the input terminus of anti-counter flow 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 limliting resistance R3, the grounded emitter of bipolar transistor Q1; Three output terminals rectifying voltage output controller U3 are connected with the couple input of photoelectricity coupling mechanism U2, the coupled output of photoelectricity coupling mechanism U2 is connected with one end of current limliting resistance R5 with dividing one end of compressive resistance R4 respectively, dividing the other end of compressive resistance R4 to be connected with the base stage of bipolar transistor Q1, the other end of current limliting resistance R5 is connected with ground connection groundbed L3.
As shown in Figure 4, one end of inductance L 4 is connected the circuit principle of anti-counter flow controller with the S end of field effect transistor U4, 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 IP1 selects the constant voltage voltage exporting 5V;
Compressive resistance R1 is divided to be 100 ��;
Polar capacitor C1 is 100 �� F;
Three end adjustable shunt reference source T1 are TL431;
Adjustable resistor R2 resistance is 200 ��, and the voltage that the regulation output end regulating adjustable resistor R2 makes its relative to ground CuSO4 reference electrode L1 remains on-1.2V;
The model of operational amplifier A R1 is Op07;
Power supply IIP2 is output voltage is the compact power of 10V;
Three proper voltage output controller IU1 models are LM7805;
Buried pipeline system L2 is the �� 720mm pipeline being applied with galvanic protection;
Voltage IIIP3 is output voltage is the compact power of 10V;
Three proper voltage output controller IIU3 models are LM7805;
The model of field effect transistor U4 is IRF4905;
The resistance of current limliting resistance R3 is 1000 ��;
The model of computing photoelectricity coupling mechanism U2 is 6N137;
The resistance dividing compressive resistance R4 is 2000 ��;
Bipolar transistor Q1 model is TO-226-AANPN transistor;
The resistance of current limliting resistance IIR5 is 10000 ��;
Groundbed L3 material is ferrosilicon anode;
Inductance L 4, inductance L 5 and inductance L 6 are 330 �� H;
Polar capacitor C2, polar capacitor C3 and polar capacitor C4 are 470 �� F;
U6 is three pin MBR2545 integrated circuit (IC) chip of two diodes in parallel.
The flow process of this example control method is as shown in Figure 1. Its flow process is:
Gather and compare pipe-to-soil potential;
Exceed a reference source setting valve value to judge? such as "Yes", then through photoelectricity coupling, Contrary compensation Controlling System works; Anti-counter flow controller conducting; It is applied to buried pipeline system; Such as "No", then through Phototube Coupling, Contrary compensation Controlling System stopping work.
This example is through test, it is possible to adopt the self-powered modes such as power storage cell to solve the problem of long distance pipeline field without power supply; Instantaneous big interference problem is solved by multiple spot compensation way; Device size is little, installs with easy to maintenance; It is particularly suitable for the control of discontinuity dynamic disturbance.
Claims (2)
1. the buried pipeline pipe-to-soil potential using buried pipeline pipe-to-soil potential to cross negative control method crosses a negative control device, and described method is first set up three relatively independent circuit: voltage reference source circuit A01, signals collecting compare and trigger control circuit A02 and Contrary compensation pilot circuit A03, voltage-reference compares and the valve value of trigger control circuit trigging control institute foundation as signals collecting, comparing the pipe-to-soil potential gathered with trigger control circuit A02 when signals collecting when exceeding valve value prescribed value, the operational amplifier in this circuit is just to output, and photoelectricity coupling mechanism triggers and conducting, triggers Contrary compensation pilot circuit and starts to apply forward current to pipeline, until when the pipe-to-soil potential that signals collecting and comparison circuit A02 gather has returned in setting valve value allowed band, operational amplifier no-output, photoelectricity coupling mechanism does not trigger, and Phototube Coupling comes into force, and trigging control is cancelled, Contrary compensation pilot circuit stopping work, its flow process is: gathers and compares pipe-to-soil potential, judge whether to exceed voltage-reference setting valve value? such as "No", then photoelectricity coupling mechanism does not trigger, Contrary compensation Controlling System stopping work, such as "Yes", then photoelectricity coupling mechanism triggers, and Contrary compensation Controlling System works, it is applied to buried pipeline system, it is characterized in that buried pipeline pipe-to-soil potential is crossed the principle of negative control device and is: voltage reference source circuit output 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 compare with trigger control circuit export connect Contrary compensation pilot circuit through photoelectricity coupling control, Contrary compensation pilot circuit exports and takes over control counter flow controller, anti-counter flow controller exports and connects buried pipeline system, the diode of anti-counter flow controller inside controls between anti-counter flow controller and buried pipeline system whether current lead-through according to the sense of current, the electric principle of equipment therefor is: the positive pole of power supply IP1 is connected with one end of point compressive resistance R1, the other end of point compressive resistance R1 respectively with the positive terminal of polar capacitor C1, one end of adjustable resistor R2, and three the K end of end adjustable shunt reference source T1 be connected with R end, the negative pole end of power supply IP1 respectively with the negative pole end of polar capacitor C1, the A end of three end adjustable shunt reference source T1, and the other end of adjustable resistor R2 be connected, the regulation output end of adjustable resistor R2 is connected with the reverse input terminus of operational amplifier A R1, the positive input of operational amplifier A R1 is connected with CuSO4 reference electrode L1, the output terminal of AR1 operational amplifier is connected with the input terminus of photoelectricity coupling mechanism U2, the straight-through output terminal of photoelectricity coupling mechanism U2 is connected with three ground terminals rectifying voltage output controller U1 with the negative pole of power supply IIP2 respectively, the positive pole of power supply IIP2 is connected with three input terminuss rectifying voltage output controller U1, three output terminals rectifying voltage output controller U1 are connected with the output terminal of buried pipeline system L2 and anti-counter flow controller U5, the negative pole of power supply IIIP3 is connected with three ground terminals rectifying voltage output controller U3, and ground connection, the positive pole of power supply IIIP3 is rectified the input terminus of voltage output controller U3, the D end of field effect transistor U4 and one end of current limliting resistance R3 with three respectively and is connected, and the S end of field effect transistor U4 is connected with the input terminus of anti-counter flow 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 limliting resistance R3, the grounded emitter of bipolar transistor Q1,Three output terminals rectifying voltage output controller U3 are connected with the couple input of photoelectricity coupling mechanism U2, the coupled output of photoelectricity coupling mechanism U2 is connected with one end of current limliting resistance R5 with dividing one end of compressive resistance R4 respectively, dividing the other end of compressive resistance R4 to be connected with the base stage of bipolar transistor Q1, the other end of current limliting resistance R5 is connected with ground connection groundbed L3.
2. buried pipeline pipe-to-soil potential according to claim 1 crosses negative control device, it is characterized in that increasing anti-counter flow controller between Contrary compensation pilot circuit and buried pipeline system, the electric principle of anti-counter flow controller is: one end of inductance L 4 is connected with the S end of field effect transistor U4, 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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Families Citing this family (5)
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| CN105822907B (en) * | 2016-05-17 | 2018-02-16 | 南方电网科学研究院有限责任公司 | A kind of control method of buried metal pipeline pipe to soil potential |
| 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 |
| CN107863767B (en) * | 2016-09-22 | 2019-05-07 | 中国石油天然气股份有限公司 | Oil-gas pipeline valve chamber earth protective device |
| CN109094427B (en) * | 2018-08-23 | 2023-09-22 | 南京铁道职业技术学院 | Subway stray current suppression system and method based on voltage compensation |
| 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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| JP3609206B2 (en) * | 1995-06-16 | 2005-01-12 | 富士通株式会社 | POWER CONTROL DEVICE, LOAD TEST METHOD, AND ELECTRONIC DEVICE |
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| CN101343744A (en) * | 2008-08-28 | 2009-01-14 | 中国石油大学(北京) | Active interference removing apparatus for buried pipeline |
| CN201584951U (en) * | 2009-07-28 | 2010-09-15 | 仝兴孚 | Direct current voltage sampling comparison circuit |
| CN102253335A (en) * | 2011-06-20 | 2011-11-23 | 褚宝祥 | Detection circuit used for turning off thyristor |
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Effective date of registration: 20211117 Address after: Room 08-10, 6 / F, block a, No. 5, Dongtucheng Road, Chaoyang District, Beijing 100013 Patentee after: National Petroleum and natural gas pipeline network Group Co.,Ltd. Address before: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee before: PETROCHINA Co.,Ltd. |
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