CN100567575C - Active interference removing apparatus for buried pipeline - Google Patents
Active interference removing apparatus for buried pipeline Download PDFInfo
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- CN100567575C CN100567575C CNB2008101191636A CN200810119163A CN100567575C CN 100567575 C CN100567575 C CN 100567575C CN B2008101191636 A CNB2008101191636 A CN B2008101191636A CN 200810119163 A CN200810119163 A CN 200810119163A CN 100567575 C CN100567575 C CN 100567575C
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Abstract
The present invention relates to a kind of active interference removing apparatus for buried pipeline, comprise DC power source unit, pipe-to-soil potential transmitter, given potentiometer, voltage control unit and power output unit, voltage control unit is used to generate the PWM pulse-width signal, the power output unit is used for controlling according to the PWM pulse-width signal output of its inner invertor, to auxiliary groundbed and buried pipeline output through filtering process and with pipeline disturb equal and opposite in direction, direction opposite remove interfering voltage.The present invention is by adopting following-up type PWM control mode, make its output can in time follow the variation of the reference instruction signal of command voltage processing module, have advantages such as output sensitivity height, speed of response is fast, dynamic property is good, be specially adapted to elimination and change caused interference by high voltage transmission line and space weather.
Description
Technical field
The present invention relates to the galvanic corrosion field of buried metal pipeline, especially relate to a kind of active interference removing apparatus for buried pipeline.
Background technology
Economic sustainable growth makes the demand of the energy increasing, and the construction of transmitting line and oil pipeline is all in fast development.Be subjected to the density of population, land resources situation and power industry and petrochemical industry to factor affecting such as the principle of selecting the best qualified of transmission route are close, make the long distance of ultra-high-tension power transmission line and buried pipeline situation parallel or arranged in a crossed manner happen occasionally.Parallel with buried pipeline or when intersecting, when high voltage transmission line because the alternating electromagnetic field that high voltage transmission line produces influence will induce voltage of alternating current and electric current on the buried pipeline of metal material.
Even at nobody is the interferential zone, also have the pipe-to-soil potential and the pipeline electric current of continuous variation on the buried pipeline, this pipe-to-soil potential changes relevant with the disturbance in terrestrial magnetic field usually.When big spot group, coronal hole, intensive solar flare, violent physical phenomenons such as substance slinging are arranged on the sun, a large amount of charged particle stream, energetic rays enter solar-terrestrial physics, terrestrial space particularly, caused the acute variation in big terrestrial magnetic field, the magnetic field of variation also will produce alternation induction voltage and electric current on buried pipeline.
Ultra-high-tension power transmission line is called as with the interference that factors such as the earth changes of magnetic field produce on buried pipeline and exchanges interference; the pipe-to-soil potential that is subjected to exchanging the interferential buried pipeline is in the continuous variation; when pipe-to-soil potential is higher than its protection potential (0.85V) time; pipeline produces Leakage Current over the ground, and this Leakage Current can cause AC corrosion to pipeline.When pipe-to-soil potential low excessively (less than-1.2V) time, can cause the breakage of pipeline coatings, and cause that the liberation of hydrogen of responsive steel destroys.
At present, prior art generally adopts the current drainage method to eliminate with cathodic protector and exchanges interference.
What application was more in the current drainage method is the method for limiting potential drainage method and the current drainage of sacrificial anode additive polarity, the limiting potential drainage method makes pipeline be connected with the earth by current drainage joint to carry out direct electric drainage, and current drainage saves to be made up of two arms, and wherein an arm is connected in series a silicon diode, its anodal road of taking over claims positive arm; Two silicon diodes of serial connection in another arm, its negative pole is taken over the road, claims negative arm.When on pipeline, interfering voltage being arranged, positive arm conducting when voltage is in positive half cycle, negative arm conducting when voltage is in negative half period.The actual use shows, disturbs the harm that pipeline is caused though the limiting potential drainage device has been alleviated to exchange to a certain extent, but still can not solve the Corrosion of Pipeline problem fully.Because the forward voltage drop of silicon diode is 0.7V, therefore when positive arm conducting that current drainage saves, voltage remaining on the pipeline will be greater than 0.7V, and (0.85V), pipeline will inevitably be corroded this remaining voltage in this case greater than the protection potential of pipeline.The method of sacrificial anode additive polarity current drainage can provide normal cathodic protection potential to pipeline when pipe-to-soil potential raises, but it can only exchange interference to eliminating pipeline by folk prescription, can not eliminate pipe-to-soil potential and cross the low harm that pipeline is caused.
Cathodic protector relies on its inner potentiostat to provide protection voltage to buried pipeline, makes the pipe cathode polarization, the prevention corrosive pipeline.The characteristics of potentiostat are: the signal of feedback is the pipe-to-soil potential value that records, and relatively controls by feedback pipe-to-soil potential and given current potential and adjusts potentiostat output.When pipe-to-soil potential raises; increase output voltage to reduce pipe-to-soil potential; when pipe-to-soil potential descends; reduce output voltage; but output voltage can only drop to zero; if pipe-to-soil potential continues to descend, then potentiostat can not play a protective role, so cathodic protector can not be eliminated the interchange interference fully.In addition; in order to make output voltage stabilization, ripple factor little; existing cathodic protector adopts big inductance or big capacitor filter; can make the output voltage of cathodic protector lag behind the control signal of input like this; when the interchange interference exists; because time of lag is oversize, be difficult in time eliminate and disturb by control, sometimes also can owing to the period and interference time mismatch cause even more serious instability concussion.
In sum, eliminate buried pipeline alternation interferential technical scheme, all can not fundamentally eliminate fully to exchange and disturb although prior art proposes some.
Summary of the invention
The purpose of this invention is to provide a kind of active interference removing apparatus for buried pipeline, the alternation that not only can eliminate fully on the buried pipeline disturbs, and speed of response is fast, and dynamic property is good.
To achieve these goals, the invention provides a kind of active interference removing apparatus for buried pipeline, comprise the DC power source unit that is used to provide direct supply, be used to detect buried pipeline pipe-to-soil potential the pipe-to-soil potential transmitter and be used to provide the given potentiometer of given current potential, also comprise voltage control unit and power output unit, described voltage control unit is connected with given potentiometer with described pipe-to-soil potential transmitter, be used for the pipe-to-soil potential of receiving tube ground potential transmitter transmission and the given current potential that given potentiometer sends, according to the desirable reference instruction signal that removes interfering voltage of comparative result generation reflection of described pipe-to-soil potential and given current potential; Described voltage control unit also is connected with the output terminal of described power output unit simultaneously, is used to monitor the actual interfering voltage that goes of power output unit output, and generates the PWM pulse-width signal according to actual interfering voltage and the desirable deviation of interfering voltage of going of going; Described power output unit comprises invertor and filtering circuit, the input terminus of described invertor is connected with DC power source unit, the control end of described invertor is connected with described voltage control unit, be used to receive the PWM pulse-width signal that voltage control unit sends, according to described PWM pulse-width signal, the dc inverter of DC power source unit output is become bipolar voltage, make the output of invertor follow the variation of reference instruction signal; The input terminus of described filtering circuit is connected with the output terminal of invertor, the output terminal of described filtering circuit is connected with buried pipeline with auxiliary groundbed respectively, be used for the bipolar voltage of invertor output is carried out filtering process, form with pipeline and disturb equal and opposite in direction, the actual interfering voltage that goes that direction is opposite to export to auxiliary groundbed and buried pipeline.
Described voltage control unit comprises:
Signal processing module is connected with the pipe-to-soil potential transmitter, is used for pipe-to-soil potential and processing that receiving tube ground potential transmitter sends;
The command voltage processing module, be connected with given potentiometer with signal processing module respectively, be used for the pipe-to-soil potential of received signal processing module transmission and the given current potential that given potentiometer sends, according to the comparative result generation reference instruction signal of this pipe-to-soil potential and given current potential;
The voltage-tracing control module, the output terminal of and instruction voltage processing module and power output unit is connected respectively, be used for receiving the desirable reference instruction signal that removes interfering voltage of reflection from the command voltage processing module, receive its actual interfering voltage that goes from the output terminal of power output unit, according to actual interfering voltage and the desirable deviation of removing interfering voltage of going, generate the PWM pulse-width signal;
Driving circuit is connected with the invertor of voltage-tracing control module with the power output unit respectively, according to PWM pulse-width signal control inverter output and pipeline interference equal and opposite in direction, the actual interfering voltage that goes that direction is opposite.
On the technique scheme basis, when buried pipeline and high voltage power transmission line parallel near the time, the output terminal of described power output unit is connected the terminal location of buried pipeline.When buried pipeline and high voltage transmission line cross-distribution, the output terminal of described power output unit is connected the crossover location of buried pipeline and high voltage transmission line.When buried pipeline was equipped with isolated flange, the output terminal of described power output unit was connected two side positions of buried pipeline isolated flange, is used to the electromagnetic interference that prevents that space weather from causing.
On the technique scheme basis; also comprise the cathodic protector that is arranged on two side positions of the crossover location of terminal location, buried pipeline and the high voltage transmission line of the buried pipeline of high voltage power transmission line parallel or buried pipeline isolated flange; the output terminal and the cathodic protector of described power output unit are connected in series, and protect buried pipeline jointly.
The present invention proposes a kind of active interference removing apparatus for buried pipeline, owing to adopt the controlled bipolar voltage of invertor output size and Orientation, to buried pipeline " injection " pipe-to-soil potential opposite, therefore can eliminate any interference that on pipeline, produces fully with the pipeline interference radiating way; Owing to adopt invertor and voltage-tracing control module unitized construction, by adopting following-up type PWM control mode, make its output can in time follow the variation of the reference instruction signal of command voltage processing module, therefore have advantages such as output sensitivity height, speed of response is fast, dynamic property is good, be specially adapted to elimination and change caused interference by high voltage transmission line and space weather.Further, the present invention has also summed up about characteristics and the rule of various interference to the pipeline influence, the best configuration principle of active interference removing apparatus for buried pipeline of the present invention has been proposed simultaneously, be respectively: if buried pipeline and high voltage power transmission line parallel are approaching, the present invention is configured in two terminals of this segment pipe; If buried pipeline and high voltage transmission line cross-distribution, the present invention is configured in the place, point of crossing; For the pipeline that isolated flange is housed, be the electromagnetic interference that prevents that space weather from causing, the present invention then is configured in the both sides of isolated flange.By equipping rules of the present invention, can realize best effect according to the disturbed condition of transmission line of alternation current, according to the pipe-to-soil potential distribution situation reasonable disposition active interference removing apparatus for buried pipeline of the present invention that the ground magnetic interference of space weather produces on buried pipeline.Further, active interference removing apparatus for buried pipeline of the present invention also can be used with the pipeline cathode protection device, is with a wide range of applications.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the structural representation of active interference removing apparatus for buried pipeline of the present invention;
Fig. 2 is the structural representation of active interference removing apparatus for buried pipeline embodiment of the present invention;
Fig. 3 the time carves the interfering voltage that produces on the pipeline along pipeline distribution situation synoptic diagram at a time for the parallel distribution with buried pipeline of high voltage transmission line;
Fig. 4 carves the interfering voltage that produces on the pipeline during for high voltage transmission line and buried pipeline cross-distribution at a time along pipeline distribution situation synoptic diagram;
Carve the interfering voltage that produces on the buried pipeline during the earth changes of magnetic field that Fig. 5 causes for space weather at a time along pipeline distribution situation synoptic diagram;
Fig. 6 produces the distribution schematic diagram that removes interfering voltage for active interference removing apparatus for buried pipeline of the present invention.
Description of reference numerals:
The 1-DC power source unit; 2-power output unit; The 3-voltage control unit;
4-assists groundbed; The 5-buried pipeline; 6-pipe-to-soil potential transmitter;
The given potentiometer of 7-; The 8-reference electrode; The 21-invertor;
The 22-filtering circuit; The 31-signal processing module; 32-command voltage processing module;
33-voltage-tracing control module; The 34-driving circuit; The 100-high voltage transmission line.
Embodiment
Fig. 1 is the structural representation of active interference removing apparatus for buried pipeline of the present invention.As shown in Figure 1, active interference removing apparatus for buried pipeline of the present invention comprises DC power source unit 1, power output unit 2, voltage control unit 3, pipe-to-soil potential transmitter 6, given potentiometer 7 and reference electrode 8, wherein pipe-to-soil potential transmitter 6 is connected with reference electrode 8, is used to detect the pipe-to-soil potential of buried pipeline 5; Given potentiometer 7 is used to provide given current potential; Voltage control unit 3 is connected with given potentiometer 7 with pipe-to-soil potential transmitter 6, be used for the pipe-to-soil potential of receiving tube ground potential transmitter 6 transmissions and the given current potential that given potentiometer 7 sends, according to the desirable reference instruction signal that removes interfering voltage of comparative result generation reflection of this pipe-to-soil potential and given current potential; Simultaneously, voltage control unit 3 also is connected with the output terminal of power output unit 2, is used to monitor the actual interfering voltage that goes of power output unit 2 outputs, and generates the PWM pulse-width signal according to actual interfering voltage and the desirable comparative result of interfering voltage that goes of going.The control end of power output unit 2 is connected with voltage control unit 3, its input terminus is connected with DC power source unit 1, its output terminal is connected with buried pipeline 5 with auxiliary groundbed 4 respectively, be used to receive the PWM pulse-width signal that voltage control unit 3 sends, output according to this PWM pulse-width signal control inverter, output goes interfering voltage to auxiliary groundbed 4 and buried pipeline 5 outputs through filtering process, this goes interfering voltage and pipeline to disturb equal and opposite in direction, direction is opposite, disturb the pipe-to-soil potential that on buried pipeline, produces to change to offset to exchange, obtain ideal pipe-to-soil potential waveform.
Fig. 2 is the structural representation of active interference removing apparatus for buried pipeline embodiment of the present invention.As shown in Figure 2, in the above-mentioned technical solutions of this embodiment, power output unit 2 comprises invertor 21 and filtering circuit 22, the input terminus of invertor 21 is connected with DC power source unit 1, output terminal is connected with filtering circuit 22, and control end is connected with voltage control unit 3, is used for the PWM pulse-width signal that sends according to voltage control unit 3, the dc inverter of DC power source unit 1 output is become bipolar voltage, make its output follow the variation of PWM pulse-width signal; The input terminus of filtering circuit 22 is connected with invertor 21, output terminal is connected with buried pipeline 5 with auxiliary groundbed 4 respectively, be used for the bipolar voltage of invertor 21 output is carried out filtering process, form with pipeline and disturb equal and opposite in direction, the interfering voltage that goes that direction is opposite to export to auxiliary groundbed 4 and buried pipeline 5.Voltage control unit 3 comprises signal processing module 31, command voltage processing module 32, voltage-tracing control module 33 and driving circuit 34, signal processing module 31 is connected with pipe-to-soil potential transmitter 6, be used for the pipe-to-soil potential of receiving tube ground potential transmitter 6 transmissions and handle the input signal of back as command voltage processing module 32, in the present embodiment, pipe-to-soil potential transmitter 6 also is connected with reference electrode 8; Command voltage processing module 32 is connected with given potentiometer 7 with signal processing module 31 respectively, be used for the pipe-to-soil potential of received signal processing module 31 transmissions and the given current potential that given potentiometer 7 sends, generate the reference instruction signal according to the comparative result of this pipe-to-soil potential and given current potential, it is exactly that the expectation power output unit 2 outputs interchange interferential that can promptly and accurately eliminate buried pipeline removes interfering voltage that the ideal that the reference instruction signal is reflected is removed interfering voltage; The output terminal of voltage-tracing control module 33 difference and instruction voltage processing modules 32 and power output unit 2 is connected, be used for receiving the desirable reference instruction signal that removes interfering voltage of reflection from command voltage processing module 32, receive its actual interfering voltage that goes from the output terminal of power output unit 2, according to actual interfering voltage and the desirable deviation of removing interfering voltage of going, generate the PWM pulse-width signal; One end of driving circuit 34 is connected with voltage-tracing control module 33, the other end is connected with the invertor 21 of power output unit 2, according to PWM pulse-width signal control inverter 21, remove the size and Orientation of interfering voltage to adjust 2 outputs of power output unit, promptly to buried pipeline " injection " pipe-to-soil potential opposite with the pipeline interference radiating way, the present invention can be offset timely and accurately exchange the pipe-to-soil potential variation that interference produces on buried pipeline, obtain ideal pipe-to-soil potential waveform.
In technique scheme of the present invention, DC power source unit can be the direct supply that the 380V alternating-current obtains through rectifying and wave-filtering, when AC-less power exists in actual the use, also can be the direct supply that gas electricity generator device or solar energy equipment provide.Filtering circuit adopts littler filter capacitor, and the transitional circuit time is shortened.Active interference removing apparatus for buried pipeline provided by the invention is owing to adopt the controlled bipolar voltage of invertor output size and Orientation, to buried pipeline " injection " pipe-to-soil potential opposite, therefore can eliminate any interference that on pipeline, produces fully with the pipeline interference radiating way; Owing to adopt invertor and voltage-tracing control module unitized construction, by adopting following-up type PWM control mode, make its output can in time follow the variation of command voltage processing module PWM pulse-width signal, therefore have advantages such as output sensitivity height, speed of response is fast, dynamic property is good.
Contriver's further investigation for many years finds that the cathodic protector of prior art seldom can play to eliminate and exchange the interferential effect at present, and the installation site of cathodic protector contradicts with anti-interference on most of buried pipeline.For example; from the principle of optimality of economical rationality, the cathodic protector of one section buried pipeline should be installed in the middle of the pipeline, but studies show that of contriver; from eliminating the principle of optimality of high voltage transmission line and spatial interference, the cathodic protector of a segment pipe should be installed in the two ends of pipeline.Therefore; jamproof principle of optimality is not satisfied in the installation site of cathodic protector at present; when the interchange interference existed, the cathodic protector role is: any side in the cathodic protector installation site played the overprotection effect, plays effect under proteciton at its opposite side.
For this reason, the contriver is subjected to the characteristics and the rule of disturbing influence according to buried pipeline, has proposed the equipping rules of active interference removing apparatus for buried pipeline of the present invention, is illustrated respectively by following embodiment.
First embodiment
Fig. 3 carves the interfering voltage that produces on the pipeline at a time along pipeline distribution situation synoptic diagram when distributing for high voltage transmission line is parallel with buried pipeline, Fig. 4 carves the interfering voltage that produces on the pipeline at a time along pipeline distribution situation synoptic diagram when being high voltage transmission line and buried pipeline cross-distribution.At the influence of high voltage transmission line to buried pipeline, the characteristics that the contriver sums up with rule are: when high voltage transmission line parallel with certain section buried pipeline near the time, end pipe-to-soil potential maximum with high voltage transmission line parallel-segment buried pipeline, decay gradually along buried pipeline away from this end pipe-to-soil potential, as shown in Figure 3.Particularly, the AB section of buried pipeline 5 is parallel with high voltage transmission line 100, buried pipeline 5 continues to extend and away from high voltage transmission line 100 beyond the AB section, disturb the pipe-to-soil potential that causes in the A of buried pipeline 5 point and B point place maximum by the interchange that high voltage transmission line 100 produces, decay gradually away from the pipe-to-soil potential of A point and B point buried pipeline 5.When buried pipeline intersects with high voltage transmission line, maximum in the pipe-to-soil potential variation of place, point of crossing buried pipeline, decay gradually along pipeline away from the point of crossing pipe-to-soil potential, as shown in Figure 4.Particularly, buried pipeline 5 intersects at a C place with high voltage transmission line 100, disturbs the pipe-to-soil potential that causes in the C of buried pipeline 5 point place maximum by the interchange of high voltage transmission line 100, decays gradually away from the pipe-to-soil potential of C point buried pipeline 5.
If buried pipeline and high voltage power transmission line parallel are approaching, when configuration active interference removing apparatus for buried pipeline of the present invention, present embodiment is configured in the end of buried pipeline with active interference removing apparatus for buried pipeline of the present invention, and the output terminal of power output unit 2 promptly of the present invention is connected the terminal location of buried pipeline (A point among Fig. 3 and B point).
If buried pipeline and high voltage transmission line cross-distribution, when configuration active interference removing apparatus for buried pipeline of the present invention, present embodiment is configured in the infall of buried pipeline and high voltage transmission line with active interference removing apparatus for buried pipeline of the present invention, and the output terminal of power output unit 2 promptly of the present invention is connected the crossover location (the C point among Fig. 4) of buried pipeline and high voltage transmission line.
Second embodiment
Carve the interfering voltage that produces on the buried pipeline during the earth changes of magnetic field that Fig. 5 causes for space weather at a time along pipeline distribution situation synoptic diagram.At the influence of the earth changes of magnetic field to buried pipeline, characteristics and rule that the contriver sums up are: when length was equipped with isolated flange apart from the oil transportation buried pipeline, the pipe-to-soil potential that big geomagnetic field disturbance causes changed maximum in the isolated flange both sides, as shown in Figure 5.Particularly, at isolated flange 101, isolated flange 102, isolated flange 103 and isolated flange 104 places, the pipe-to-soil potential of the buried pipeline that is caused by the earth changes of magnetic field is maximum at the place, both sides near each isolated flange 101～isolated flange 104 as can be seen, decays gradually away from the pipe-to-soil potential of isolated flange 101～isolated flange 104.
For the buried pipeline that isolated flange is housed, when considering spatial interference, when configuration active interference removing apparatus for buried pipeline of the present invention, present embodiment is configured in the isolated flange both sides of buried pipeline with active interference removing apparatus for buried pipeline of the present invention, and the output terminal of power output unit promptly of the present invention is connected isolated flange two side positions (both sides of isolated flange 101～isolated flange 104 among Fig. 5) of buried pipeline.
Fig. 6 produces the distribution schematic diagram that removes interfering voltage for active interference removing apparatus for buried pipeline of the present invention.As shown in Figure 6, the J place is the confluence of active interference removing apparatus for buried pipeline of the present invention on buried pipeline 5, in the pipe-to-soil potential maximum of J place buried pipeline 5, decays gradually away from the pipe-to-soil potential of J place buried pipeline 5.The positive dirction voltage curve family that solid line among Fig. 6 produces for active interference removing apparatus for buried pipeline of the present invention, the negative direction voltage curve family that dotted line produces for active interference removing apparatus for buried pipeline of the present invention.Like this can be according to the configuration place of different interference type characteristic distributions and rule selection active interference removing apparatus for buried pipeline of the present invention.Like this, active interference removing apparatus for buried pipeline of the present invention acts on the buried pipeline voltage and acts on the pipeline voltage along pipeline distribution and transmission line, the earth magneticinterference and distribute along pipeline and match, and more helps eliminating fully interference such as alternation.
In addition; when having had cathodic protector to be configured in above-mentioned place on the buried pipeline or when neighbouring; then can use active interference removing apparatus for buried pipeline of the present invention and the series connection of existing cathodic protector; like this can the common anode groundbed; in the time of can avoiding disposing active interference removing apparatus for buried pipeline of the present invention again to pipe excavation; active interference removing apparatus for buried pipeline of the present invention and the stack of existing cathodic protector output voltage; can eliminate interference fully, make pipe-to-soil potential track protection current potential set-point.
It should be noted that at last: above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not break away from the spirit and scope of technical solution of the present invention.
Claims (6)
1. active interference removing apparatus for buried pipeline, comprise the DC power source unit that is used to provide direct supply, be used to detect buried pipeline pipe-to-soil potential the pipe-to-soil potential transmitter and be used to provide the given potentiometer of given current potential, it is characterized in that, also comprise voltage control unit and power output unit, described voltage control unit is connected with given potentiometer with described pipe-to-soil potential transmitter, be used for the pipe-to-soil potential of receiving tube ground potential transmitter transmission and the given current potential that given potentiometer sends, according to the desirable reference instruction signal that removes interfering voltage of comparative result generation reflection of described pipe-to-soil potential and given current potential; Described voltage control unit also is connected with the output terminal of described power output unit simultaneously, is used to monitor the actual interfering voltage that goes of power output unit output, and generates the PWM pulse-width signal according to actual interfering voltage and the desirable deviation of interfering voltage of going of going; Described power output unit comprises invertor and filtering circuit, the input terminus of described invertor is connected with DC power source unit, the control end of described invertor is connected with described voltage control unit, be used to receive the PWM pulse-width signal that voltage control unit sends, according to described PWM pulse-width signal, the dc inverter of DC power source unit output is become bipolar voltage, make the output of invertor follow the variation of reference instruction signal; The input terminus of described filtering circuit is connected with the output terminal of invertor, the output terminal of described filtering circuit is connected with buried pipeline with auxiliary groundbed respectively, be used for the bipolar voltage of invertor output is carried out filtering process, form with pipeline and disturb equal and opposite in direction, the actual interfering voltage that goes that direction is opposite to export to auxiliary groundbed and buried pipeline.
2. active interference removing apparatus for buried pipeline according to claim 1 is characterized in that, described voltage control unit comprises:
Signal processing module is connected with the pipe-to-soil potential transmitter, is used for pipe-to-soil potential and processing that receiving tube ground potential transmitter sends;
The command voltage processing module, be connected with given potentiometer with signal processing module respectively, be used for the pipe-to-soil potential of received signal processing module transmission and the given current potential that given potentiometer sends, according to the comparative result generation reference instruction signal of this pipe-to-soil potential and given current potential;
The voltage-tracing control module, the output terminal of and instruction voltage processing module and power output unit is connected respectively, be used for receiving the desirable reference instruction signal that removes interfering voltage of reflection from the command voltage processing module, receive its actual interfering voltage that goes from the output terminal of power output unit, according to actual interfering voltage and the desirable deviation of removing interfering voltage of going, generate the PWM pulse-width signal;
Driving circuit is connected with the invertor of voltage-tracing control module with the power output unit respectively, according to PWM pulse-width signal control inverter output and pipeline interference equal and opposite in direction, the actual interfering voltage that goes that direction is opposite.
3. active interference removing apparatus for buried pipeline according to claim 1 and 2 is characterized in that, when buried pipeline and high voltage power transmission line parallel near the time, the output terminal of described power output unit is connected the terminal location of buried pipeline.
4. active interference removing apparatus for buried pipeline according to claim 1 and 2 is characterized in that, when buried pipeline and high voltage transmission line cross-distribution, the output terminal of described power output unit is connected the crossover location of buried pipeline and high voltage transmission line.
5. active interference removing apparatus for buried pipeline according to claim 1 and 2, it is characterized in that, when buried pipeline was equipped with isolated flange, the output terminal of described power output unit was connected two side positions of buried pipeline isolated flange, is used to the electromagnetic interference that prevents that space weather from causing.
6. active interference removing apparatus for buried pipeline according to claim 1 and 2; it is characterized in that; also comprise the cathodic protector that is arranged on two side positions of the crossover location of terminal location, buried pipeline and the high voltage transmission line of the buried pipeline of high voltage power transmission line parallel or buried pipeline isolated flange; the output terminal and the cathodic protector of described power output unit are connected in series, and protect buried pipeline jointly.
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| CNB2008101191636A CN100567575C (en) | 2008-08-28 | 2008-08-28 | Active interference removing apparatus for buried pipeline |
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| CNB2008101191636A CN100567575C (en) | 2008-08-28 | 2008-08-28 | Active interference removing apparatus for buried pipeline |
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| CN100567575C true CN100567575C (en) | 2009-12-09 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104216452B (en) * | 2013-06-05 | 2016-06-08 | 中国石油天然气股份有限公司 | Buried pipeline pipe-to-ground potential overload control method and device |
| CN103695938B (en) * | 2013-12-26 | 2016-01-20 | 中国石油大学(北京) | Broad sense pulsed cathode securing system and broad sense pulse potentiostat thereof |
| CN103695937B (en) * | 2013-12-26 | 2015-12-30 | 中国石油大学(北京) | Broad sense DC cathode securing system and broad sense direct current potentiostat thereof |
| CN104178770B (en) * | 2014-08-28 | 2017-07-07 | 中国石油天然气股份有限公司 | Direct current cathode interference reducing device for buried pipeline |
| CN105780015B (en) * | 2016-04-28 | 2018-05-11 | 天津隆顺技术服务有限公司 | A kind of compound impressed current cathodic protection system |
| CN105975768B (en) * | 2016-04-29 | 2018-10-16 | 南方电网科学研究院有限责任公司 | Method and device for arranging buried pipeline sectional insulation |
| CN105780014B (en) * | 2016-04-29 | 2018-06-29 | 南方电网科学研究院有限责任公司 | Cathode protection method and cathode protection system for buried pipeline |
| CN107815690B (en) * | 2017-12-07 | 2024-02-02 | 中国石油大学(华东) | Pipeline anti-corrosion device |
| CN109066626B (en) * | 2018-08-28 | 2019-04-30 | 成都中航信虹科技股份有限公司 | The drainage method and stream discharging system of pipeline |
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