CN203397251U - Direct current and negative interference controller for underground pipes - Google Patents
Direct current and negative interference controller for underground pipes Download PDFInfo
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- CN203397251U CN203397251U CN201320320294.7U CN201320320294U CN203397251U CN 203397251 U CN203397251 U CN 203397251U CN 201320320294 U CN201320320294 U CN 201320320294U CN 203397251 U CN203397251 U CN 203397251U
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Abstract
The utility model provides a direct current and negative interference controller for underground pipes to eliminate interference of direct current and stray current. The output of a voltage referential original circuit is connected with a signal acquisition, comparison and trigger control circuit, and the signal acquisition, comparison and trigger control circuit acquires pipe ground potential signals and feeds back signals to an underground pipe system. The output of the signal acquisition, comparison and trigger control circuit is connected with a reverse compensation control circuit through a photoelectric coupling control means, and the output of the reverse compensation control circuit is connected with an anti-backflow controller, of which the output is connected with the underground pipe system. A diode in the anti-backflow controller controls current conduction between the anti-backflow controller and the underground pipe system according to the current direction. The direct current and negative interference controller prevents excessive negative pipe ground potential due to interference of direct current, and minimizes the risk of hydrogen embrittlement of pipes and peeling off of a coating.
Description
Technical field
The utility model is the buried pipeline direct current negative interference control device that a kind of solution suffers direct current clutter interference.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, they are more and more with the intersecting of buried oil and gas pipes, parallel phenomenon, and the energy " public corridor " is more and more general.But the electric field environment of DC power transmission line, unusual service condition operation and ground connection arrange, and using direct current and all can cause DC stray current to disturb to its contiguous buried steel pipeline as the light rail systems of driving source etc., at the region pipe-to-soil potential of outflow of bus current piping system (returning to stray current interference source), shuffle and corrode, and cause pipeline current potential excessively negative in the region of electric current flow ipe system, easily bring out pipe line steel generation hydrogen embrittlement, corrosion-inhibiting coating and the adverse effect such as peel off.The pipeline pipe-to-soil potential causing for the defective insulation due to the dynamic change of urban light rail even load and rail and ground is crossed negative problem, there is no effective preventing control method and device.
At present, if protection direct current disturbs on the main drainage protection of the mode of its contiguous buried pipeline impact, although have direct electric drainage, forced electrical drainage, directional drainage and four kinds of modes of electric drainage by grounding; But due to domestic only for national conditions such as the one-sided protection in the side of being disturbed with lack the coordination system of electrical Interference, employing electric drainage by grounding substantially at present.In the region that has 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 above-mentioned control method and device can suffer pipeline significantly weakens, solve direct current and disturb the pipe-to-soil potential forward migration problem causing, cannot solve the excessively negative problem of pipe-to-soil potential, i.e. the problem of usually said " row is not just arranging negative ".In addition, because long oil and gas pipeline field condition does not have utilizable power supply setting, when controlling, drainage need to consider power consumption and the self-powered problem of control device, and for the detection feedback of pipe-to-soil potential with control 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 excessively negative problem of unresolved pipe-to-soil potential.
Utility model content
The purpose of this utility model is that a kind of protection of design causes the buried pipeline direct current negative interference control device that pipe-to-soil potential is excessively negative, solve pipeline hydrogen embrittlement, coating stripping risk because pipeline is disturbed by direct current.
Utilize collection tube earth potential, and compare with voltage-reference setting threshold values, determine whether to need to implement apply the Contrary compensation of forward current to pipeline; Simultaneously pipeline potential acquisition continues to carry out with feedback, and constantly compares feedback with setting threshold values, if pipe-to-soil potential got back in the threshold values allowed band of setting, Contrary compensation termination.In pipe-to-soil potential collection relatively subsequently, if surpass threshold values, restart Contrary compensation.And so forth.
The technical scheme that the utility model adopts is: three relatively independent circuit of model: voltage reference source circuit, signals collecting compare and trigger control circuit and Contrary compensation control circuit (see figure 1).Voltage-reference relatively triggers with trigger control circuit the threshold values of controlling institute's foundation as signals collecting.When the pipe-to-soil potential gathering when signals collecting comparison and trigger control circuit surpasses threshold values setting, the operational amplifier forward output in this circuit, 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 got back to while setting in threshold values allowed band, operational amplifier no-output, photoelectricity isolation comes into force, and triggers to control and cancels, and Contrary compensation control circuit quits work.
The principle of buried pipeline direct current negative interference control device as shown in Figure 1.The output of voltage reference primary circuit connects signals collecting comparison and trigger control circuit, and signals collecting comparison and trigger control circuit constantly and buried pipeline system carry out signals collecting and the signal feedback of pipe-to-soil potential, signals collecting comparison and trigger control circuit output are controlled and are connect Contrary compensation control circuit through photoelectric coupling, counter flow controller is taken over control in the output of Contrary compensation control circuit, the output of anti-return controller connects buried pipeline system, whether the diode of anti-return controller inside controls between anti-return controller and buried pipeline system current lead-through according to direction of current.
The circuit theory that buried pipeline pipe-to-soil potential is crossed negative control device as shown in Figure 2, the positive pole of power supply I P1 is connected with divider resistance R1 one end, the other end of divider resistance R1 respectively with positive terminal, adjustable resistor R2 one end of polar capacitor C1, and the K end of three end adjustable shunt reference source T1 is connected with R end, the negative pole end of power supply I P1 respectively with the negative pole end of polar capacitor C1, the A of three end adjustable shunt reference source T1 end, 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 of 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 of rectifying voltage output controller U1, and three output terminals of 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 of rectifying voltage output controller U3, and ground connection; The positive pole of power supply III P3 is rectified the input end of voltage output controller U3 with three, the D of field effect transistor U4 end is connected and current-limiting resistance R3 one end respectively, and the S end of field effect transistor U4 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 of rectifying voltage output controller U3 are connected with the couple input of photoelectrical coupler U2, the coupling output terminal of photoelectrical coupler U2 is connected with current-limiting resistance R5 one end with divider resistance R4 one end 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. 3 is the circuit theory diagrams of anti-return 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 one end of inductance L 5 and the anodal section of polar capacitor C2 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 order to prevent that positive voltage from flowing into Contrary compensation control circuit and damaging some components and parts of circuit from pipeline, increasing anti-return controller with the afterbody of pipeline phase connection circuit.Flow process becomes after the work of Contrary compensation control system: the conducting of anti-return controller; Be applied to buried pipeline system.
The beneficial effect that the utility model reaches:
(1) can adopt the self-powered modes such as electric power storage battery to solve long distance pipeline field without the problem of power supply;
(2) can solve instantaneous large interference problem by multiple spot compensation way;
(3) plant bulk is little, and I&M is convenient;
(4) be particularly suitable for the control of discontinuity dynamic disturbance.
Accompanying drawing explanation
Fig. 1 buried pipeline pipe-to-soil potential is crossed negative control principle of device block diagram
Fig. 2 buried pipeline pipe-to-soil potential is crossed negative control device circuit schematic diagram
The circuit theory diagrams of Fig. 3 anti-return controller
Embodiment
Embodiment. below in conjunction with accompanying drawing, utility model is further described.This example is experimental prototype, and the principle that buried pipeline pipe-to-soil potential is crossed negative control device as shown in Figure 1.The output of voltage reference primary circuit connects signals collecting comparison and trigger control circuit, and signals collecting comparison and trigger control circuit constantly and buried pipeline system carry out signals collecting and the signal feedback of pipe-to-soil potential, signals collecting comparison and trigger control circuit output are controlled and are connect Contrary compensation control circuit through photoelectric coupling, counter flow controller is taken over control in the output of Contrary compensation control circuit, the output of anti-return controller connects buried pipeline system, whether the diode of anti-return controller inside controls between anti-return controller and buried pipeline system current lead-through according to direction of current.
The circuit theory of device as shown in Figure 2.The positive pole of power supply I P1 is connected with divider resistance R1 one end, the other end of divider resistance R1 respectively with positive terminal, adjustable resistor R2 one end of polar capacitor C1, and the K end of three end adjustable shunt reference source T1 is connected with R end, the negative pole end of power supply I P1 respectively with the negative pole end of polar capacitor C1, the A of three end adjustable shunt reference source T1 end, 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 of 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 of rectifying voltage output controller U1, and three output terminals of 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 of rectifying voltage output controller U3, and ground connection; The positive pole of power supply III P3 is rectified the input end of voltage output controller U3 with three, the D of field effect transistor U4 end is connected and current-limiting resistance R3 one end respectively, and the S end of field effect transistor U4 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 of rectifying voltage output controller U3 are connected with the couple input of photoelectrical coupler U2, the coupling output terminal of photoelectrical coupler U2 is connected with current-limiting resistance R5 one end with divider resistance R4 one end 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.
As shown in Figure 3, one end of inductance L 4 is connected with the S end of field effect transistor U4 the circuit theory of anti-return controller, and the other end of inductance L 4 is connected with one end of inductance L 5 and the anodal section of polar capacitor C2 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 voltage of output 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 its relative ground connection CuSO
4remain on-1.2V of the voltage of contrast electrode L1;
The model of operational amplifier A R1 is Op07;
Power supply II P2 is that output voltage is the compact power of 10V;
Three proper voltage output controller I U1 models are LM7805;
Buried pipeline system L2 is the φ 720mm pipeline that is applied with cathodic protection;
Voltage III P3 is that output voltage is the compact power of 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.
This example, through test, can adopt the self-powered modes such as electric power storage battery to solve long distance pipeline field without the problem of power supply; Can solve instantaneous large interference problem 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 (3)
1. a buried pipeline direct current negative interference control device, is characterized in that it comprises that voltage reference source circuit, signals collecting compare and trigger control circuit and Contrary compensation control circuit; Voltage reference source circuit output connects signals collecting comparison and trigger control circuit, and have being connected of output and input between signals collecting comparison and trigger control circuit and buried pipeline system, signals collecting comparison and trigger control circuit output are controlled and are connect Contrary compensation control circuit through photoelectric coupling, counter flow controller is taken over control in the output of Contrary compensation control circuit, and the output of anti-return controller connects buried pipeline system.
2. buried pipeline direct current negative interference control device according to claim 1, the regulation output end that it is characterized in that the adjustable resistor R2 of (1) voltage reference source circuit A01 is connected with the reverse input end of the operational amplifier A R1 of trigger control circuit A02 with signals collecting comparison, signals collecting is relatively connected with the couple input of photoelectrical coupler U2 of A02 and the output terminals of the three proper voltage output controller U3 of Contrary compensation control circuit A03 of trigger control circuit, and the coupling output terminal of photoelectrical coupler U2 is connected with current-limiting resistance R5 one end with divider resistance R4 one end of Contrary compensation control circuit A03 respectively, buried pipeline system is relatively rectified the output terminal of voltage output controller U1, the output terminal of anti-return controller U5 is connected with three of trigger control circuit A02 with signals collecting respectively,
(2) formation of voltage reference source circuit A01 comprises power supply I P1, divider resistance R1, adjustable resistor R2, polar capacitor C1 and three end adjustable shunt reference source T1, the positive pole of its power supply I P1 is connected with divider resistance R1 one end, the other end of divider resistance R1 is connected with R end with the K end of positive terminal, adjustable resistor R2 one end and the three end adjustable shunt reference source T1 of polar capacitor C1 respectively, the negative pole end of power supply I P1 respectively with the negative pole end of polar capacitor C1, the A of three end adjustable shunt reference source T1 holds and the other end of adjustable resistor R2 is connected;
(3) signals collecting compares with trigger control circuit A02 by operational amplifier A R1, CuSO
4contrast electrode L1, three rectifies voltage output controller U1, photoelectrical coupler U2 and power supply II P2 forms; Positive input and the CuSO of its operational amplifier A R1
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 of rectifying voltage output controller U1 with the negative pole of power supply IIP2 respectively, and the positive pole of power supply IIP2 is connected with three input ends of rectifying voltage output controller U1;
(4) Contrary compensation control circuit A03 is comprised of power supply III P3, three proper voltage output controller U3, field effect transistor U4, bipolar transistor Q1, current-limiting resistance R3, divider resistance R4 and ground connection groundbed L3; The negative pole of its power supply IIIP3 is connected with three earth terminals of rectifying voltage output controller U3, and ground connection; The positive pole of power supply IIIP3 is rectified the input end of voltage output controller U3 with three, the D of field effect transistor U4 end is connected with current-limiting resistance R3 one end respectively, and the S end of field effect transistor U4 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 of rectifying voltage output controller U3 are connected with the couple input of photoelectrical coupler U2, the coupling output terminal of photoelectrical coupler U2 is connected with current-limiting resistance R5 one end with divider resistance R4 one end 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.
3. buried pipeline direct current negative interference control device according to claim 2, the electric principle that it is characterized in that anti-return 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 terminal 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320320294.7U CN203397251U (en) | 2013-06-05 | 2013-06-05 | Direct current and negative interference controller for underground pipes |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320320294.7U CN203397251U (en) | 2013-06-05 | 2013-06-05 | Direct current and negative interference controller for underground pipes |
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| CN203397251U true CN203397251U (en) | 2014-01-15 |
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| CN201320320294.7U Expired - Lifetime CN203397251U (en) | 2013-06-05 | 2013-06-05 | Direct current and negative interference controller for underground pipes |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104178770A (en) * | 2014-08-28 | 2014-12-03 | 中国石油天然气股份有限公司 | Direct current cathode interference mitigation device for buried pipeline |
-
2013
- 2013-06-05 CN CN201320320294.7U patent/CN203397251U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104178770A (en) * | 2014-08-28 | 2014-12-03 | 中国石油天然气股份有限公司 | Direct current cathode interference mitigation device for buried pipeline |
| CN104178770B (en) * | 2014-08-28 | 2017-07-07 | 中国石油天然气股份有限公司 | A kind of buried pipeline DC cathode disturbs slowing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211111 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 China Petroleum Building, No. 9, Dongzhimen North Street, Dongcheng District, Beijing Patentee before: PETROCHINA Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140115 |