CN104852349A - Overvoltage protective device used for natural gas pipeline system - Google Patents
Overvoltage protective device used for natural gas pipeline system Download PDFInfo
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- CN104852349A CN104852349A CN201510188835.9A CN201510188835A CN104852349A CN 104852349 A CN104852349 A CN 104852349A CN 201510188835 A CN201510188835 A CN 201510188835A CN 104852349 A CN104852349 A CN 104852349A
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Abstract
The present invention provides an overvoltage protective device used for a natural gas pipeline system. The natural gas pipeline system comprises a natural gas pipeline and a cathode protection device, and the cathode protection device is connected with the natural gas pipeline through a first wire. The overvoltage protective device comprises a first switch arranged on the first wire; a grounding device connected with the natural gas pipeline through a second wire; a second switch arranged on the second wire; a voltage measuring device connected at two ends of the second switch; and a control device for comparing the voltage measured by the voltage measuring device with a pre-set action voltage and controlling actions of the first switch and the second switch according to the comparing result. With adoption of the overvoltage protective device provided by the present invention, a pipe-ground potential difference of the pipeline at a valve chest is limited within a safe value, thereby guaranteeing personal safety and valve chest equipment operation security, and avoiding the problem of electrochemical corrosion aggravation caused by inflow and outflow of stray current after long-time earthing of the pipeline.
Description
Technical field
The present invention relates to a kind of over-pressure safety device for Natural gas pipeline system.
Background technology
In recent years, along with rapid economic development, energy demand increases fast, and remote, high-capacity direct current power transmission engineering and gas transmission, Oil Transportation Pipeline Engineering all develop rapidly.China's shortage of land resource, DC transmission engineering earth electrode and buried metal pipeline are in a lot of local close proximity, and natural gas metallic conduit inevitably will be subject to the impact of direct current grounding pole earth current.When DC power transmission system unifies pole fault or maintenance, DC transmission system will temporarily adopt monopolar ground return operational mode.Under DC transmission system monopolar ground return operational mode, direct current grounding pole to Injection Current in soil, can will cause the change of neighbouring soil current potential.When being embedded with metallic conduit in neighbouring soil, direct current grounding pole earth current will produce induced potential on pipeline, causes pipeline and near-earth soil to there is potential difference, thus causes pipeline pipe to soil potential difference excessive, reach as high as a few hectovolt, and the current potential hoisting velocity of pipeline is fast.Excessive pipe to soil potential missionary society to cause on pipeline point defeated station or valve chamber place pipe-line equipment, running job personnel work the mischief.The generation of following several accident may be caused:
1, the original pressure cathodic protection system of natural gas line or other pipe protection equipment is destroyed.
2, larger potential difference (insulation sleeve two ends are produced to the insulation sleeve two ends on gas-oil valve impulse pipeline, one end is pipeline current potential, and one end is earth potential), make it produce sparkover, larger threat is had, possible breaking out of fire or explosion accident to the safety of natural gas line.
3, to the dangerous property of the attendant of natural gas line, easily electric shock accidents is caused when not dressing insulating gloves (footwear).
Direct current grounding pole earth current has following features to natural gas line impact: the time uncertain (fault or occur between turn(a)round), action time short (several hours), earth current amplitude large (upper kiloampere), positive-negative polarity is uncertain, the feature such as cause pipeline potential shift violent.At present, the fractional unit of electric power and petroleum industry has recognized the seriousness that direct current grounding pole earth current affects buried metal pipeline at home, but conveniently DC influence and take measures as duct segments insulation method and cathode current Protection Code etc., be difficult to reduction pipeline valve chamber place current potential is reduced in safety limit; Pipeline drainage guard method; if pipeline is through banded zinc alloy anode electric drainage by grounding; the pipe to soil potential difference of earth point place pipeline can be made to be reduced in safety limit, but the mode of long-term electric drainage by grounding can cause that long-term stray electrical current flows to, outflow conduit, causes pipeline electrochemical corrosion to aggravate.
Summary of the invention
For the shortcoming of prior art, the object of this invention is to provide a kind of over-pressure safety device for Natural gas pipeline system.
To achieve these goals, the invention provides a kind of over-pressure safety device for Natural gas pipeline system, Natural gas pipeline system comprises: natural gas line, cathode protection device, and cathode protection device is connected by the first wire with natural gas line; This over-pressure safety device comprises:
First switch, it is arranged on the first wire;
Earthing device, it is connected with natural gas line by the second wire;
Second switch, it is arranged on the second wire;
Voltage measuring apparatus, it is connected to the two ends of second switch;
Control device, the voltage measured by voltage measuring apparatus and the operation voltage preset compare by it, and control the action of the first switch and second switch according to comparative result.
In the present invention, natural gas line is protected by cathode protection device.Under normal circumstances, the voltage of natural gas line is remain in the scope of-0.85V to-1.25V under the condition of forcing cathodic protection always.
In the present invention, Natural gas pipeline system comprises impulse pipeline further, and impulse pipeline is the branch road of natural gas line, and its current potential is the same with main pipeline current potential, impulse pipeline is connected with controllable valve (such as gas-oil valve) by insulation sleeve, valve end ground connection.
In the present invention, the earthing device of over-pressure safety device can be, such as, near valve chamber ground network or valve chamber ground stud.
Operation principle of the present invention is as follows: when natural gas line is subject to affecting of shape high voltage DC earthing pole earth current, the pipe ground voltage of pipeline raises, when voltage between second switch two ends pipeline and earthing device (near such as valve chamber ground network or valve chamber ground stud) reaches U (U is the operation voltage preset), control device sends instruction, control second switch closed in 100ms, the pipeline at second switch two ends is connected with earthing device, thus reduce the pipe ground voltage of natural gas line, electric current now on natural gas line will flow to the earth from natural gas line, the maximum current flowing through second switch can reach hundreds of ampere.When second switch closes, control the first switch simultaneously and disconnect, to protect the safety of cathode protection device, from the superpotential impact of pipeline.When voltage between second switch two ends pipeline and earthing device drops to U; control device sends instruction; control second switch to disconnect in 100ms; connection between natural gas line and earthing device is disconnected; first switch closes simultaneously; cathode protection device puts into operation, continues the security of operation of protection natural gas line.
The present invention both by the pipe to soil potential of valve chamber place pipeline difference limit value within safety value, thus to guarantee personal safety and valve chamber place equipment security of operation, it also avoid the long-term ground connection stray electrical current of pipeline and flow to, flow out, the problem of the electrochemical corrosion aggravation caused.
According to another embodiment of the present invention, the first switch and second switch are linked switch; When the first switch closes, second switch disconnects; When second switch closes, the first switch disconnects.
According to another embodiment of the present invention, the first switch and second switch are equipped with lightning protection device, damage under lightning overvoltage to prevent device of the present invention.
According to another embodiment of the present invention, the first switch and second switch are obturator, and during to prevent because of drop-out current, the electric spark between switch contacts causes natural gas in valve chamber to fire.
According to another embodiment of the present invention, earthing device is connected to the natural gas line at valve chamber place.
According to another embodiment of the present invention, the operate time of the first switch and second switch is less than 100ms.
According to another embodiment of the present invention, the operation voltage of the first switch and second switch is 30V-60V, and it can set according to demand, adjust.
According to another embodiment of the present invention, second switch allows the maximum current passed through to be 200A-800A.
Compared with prior art, the present invention possesses following beneficial effect:
1, customary DC interference suppression measure is as duct segments insulation method and cathode current Protection Code etc., is difficult to reduction pipeline valve chamber place current potential to be reduced in safety limit; And over-pressure safety device of the present invention is after the pipe to soil potential difference of pipeline exceedes safety limit, by valve chamber place pipeline ground connection, the pipe to soil potential that effectively can reduce valve chamber place is poor, can ensure pipe-line equipment and running job personal security.
2, conventional pipeline drainage protection method; if pipeline is through banded zinc alloy anode electric drainage by grounding; the pipe to soil potential difference of earth point place pipeline can be made to be reduced in safety limit; but the long-term ground connection of pipeline not only can cause the loss of cathodic protection current on pipeline; the protection range of pipeline cathode protection equipment is caused to reduce; also can cause that too much stray electrical current is flow to by earth point (electric current that high ferro, subway cause), outflow conduit, cause pipeline electrochemical corrosion to aggravate.Over-pressure safety device of the present invention is only after the pipe to soil potential difference at pipeline exceedes safety limit; just by valve chamber place pipeline ground connection; and under normal condition (during without earth current effect); device of the present invention does not change the running status of pipeline; pipeline keeps normal state of insulation; do not have that too much stray electrical current flows to, outflow conduit, pipeline electrochemical corrosion can not be aggravated.
3, device of the present invention is easy for installation, and fund input is less, to pipeline accidental conditions substantially without change, is easy to natural gas pipeline companies and accepts.
4, pipeline pipe to soil potential poor, the action situation of apparatus of the present invention, conduit running situation (ground connection, insulation) can be sent to conduit running supervision department in real time, and conduit running supervision department can grasp conduit running situation in real time.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of the Natural gas pipeline system of the over-pressure safety device of Application Example 1.
Embodiment
Embodiment 1
As shown in Figure 1, the Natural gas pipeline system of the over-pressure safety device of Application Example 1 comprises: natural gas line 1, cathode protection device 2, impulse pipeline 3.
Wherein, cathode protection device 2 is connected by the first wire with natural gas line 1.Impulse pipeline 3 is the branch road of natural gas line 1, and its current potential is the same with natural gas line 1 current potential, and impulse pipeline 3 is connected with controllable valve (gas-oil valve 302) by insulation sleeve 301, valve end ground connection.
Over-pressure safety device comprises: the first switch T1, earthing device 4, voltage measuring apparatus 5, control device (not shown).Wherein, the first switch T1 is arranged on the first wire.Earthing device 4 is connected with natural gas line 1 by the second wire, and it is connected to the natural gas line at valve chamber place.Second switch T2 is arranged on the second wire; Voltage measuring apparatus 5 is connected to the two ends of second switch T2.
First switch T1 and second switch T2 is linked switch; When the first switch T1 closes, second switch T2 disconnects; When second switch T2 closes, the first switch T1 disconnects.First switch T1 and second switch T2 is equipped with lightning protection device.First switch T1 and second switch T2 is obturator, and during to prevent because of drop-out current, the electric spark between switch contacts causes natural gas in valve chamber to fire.The operate time of the first switch T1 and second switch T2 is less than 100ms.The operation voltage U of the first switch T1 and second switch T2 is such as 40V.Second switch T2 allows the maximum current passed through to be such as 500A.
Voltage measured by voltage measuring apparatus and the operation voltage U preset compare by control device, and control the action of the first switch and second switch according to comparative result.Specifically, when the voltage measured by voltage measuring apparatus is greater than 40V, control device sends instruction, controls second switch T2 closed in 100ms, controls the first switch T1 simultaneously and disconnect; When the voltage measured by voltage measuring apparatus drops to 40V, control device sends instruction, and control second switch T2 and disconnect in 100ms, the first switch T1 closes simultaneously,
Although the present invention discloses as above with preferred embodiment, and is not used to limit scope of the invention process.Any those of ordinary skill in the art, not departing from invention scope of the present invention, when doing a little improvement, namely every equal improvement done according to the present invention, should be scope of the present invention and contained.
Claims (8)
1. for an over-pressure safety device for Natural gas pipeline system, described Natural gas pipeline system comprises: natural gas line, cathode protection device, and described cathode protection device is connected by the first wire with described natural gas line; It is characterized in that, described over-pressure safety device comprises:
First switch, it is arranged on described first wire;
Earthing device, it is connected with described natural gas line by the second wire;
Second switch, it is arranged on described second wire;
Voltage measuring apparatus, it is connected to the two ends of described second switch;
Control device, the voltage measured by described voltage measuring apparatus and the operation voltage preset compare by it, and control the action of described first switch and described second switch according to comparative result.
2. over-pressure safety device according to claim 1, is characterized in that, described first switch and described second switch are linked switch; When described first switch closes, described second switch disconnects; When described second switch closes, described first switch disconnects.
3. over-pressure safety device according to claim 1, is characterized in that, described first switch and described second switch are equipped with lightning protection device.
4. over-pressure safety device according to claim 1, is characterized in that, described first switch and described second switch are obturator.
5. over-pressure safety device according to claim 1, is characterized in that, described earthing device is connected to the natural gas line at valve chamber place.
6. over-pressure safety device according to claim 1, is characterized in that, the operate time of described first switch and described second switch is less than 100ms.
7. over-pressure safety device according to claim 1, is characterized in that, the operation voltage of described first switch and described second switch is 30V-60V.
8. over-pressure safety device according to claim 1, is characterized in that, described second switch allows the maximum current passed through to be 200A-800A.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510188835.9A CN104852349B (en) | 2015-04-20 | 2015-04-20 | A kind of over-pressure safety device for Natural gas pipeline system |
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| CN201510188835.9A CN104852349B (en) | 2015-04-20 | 2015-04-20 | A kind of over-pressure safety device for Natural gas pipeline system |
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| CN104852349A true CN104852349A (en) | 2015-08-19 |
| CN104852349B CN104852349B (en) | 2019-01-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105975768A (en) * | 2016-04-29 | 2016-09-28 | 南方电网科学研究院有限责任公司 | Method and apparatus for arranging buried pipeline in sectional insulation manner |
| CN105974175A (en) * | 2016-04-29 | 2016-09-28 | 南方电网科学研究院有限责任公司 | Method and device for arranging buried pipeline local grounding points |
| CN107863767A (en) * | 2016-09-22 | 2018-03-30 | 中国石油天然气股份有限公司 | Oil-gas pipeline valve chamber earth protective device |
| CN114624532A (en) * | 2022-03-14 | 2022-06-14 | 华东交通大学 | Stray current corrosion resistant power grid detection device |
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Patent Citations (5)
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| US20070023295A1 (en) * | 2005-06-02 | 2007-02-01 | Applied Semiconductor International Ltd. | Apparatus, system and method for extending the life of sacrificial anodes on cathodic protection systems |
| ES2355681A1 (en) * | 2008-02-15 | 2011-03-30 | Juan Manuel Montero Meló | Polarized interval and overvoltage downloader for electrified railway lines in continuous current. (Machine-translation by Google Translate, not legally binding) |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105975768A (en) * | 2016-04-29 | 2016-09-28 | 南方电网科学研究院有限责任公司 | Method and apparatus for arranging buried pipeline in sectional insulation manner |
| CN105974175A (en) * | 2016-04-29 | 2016-09-28 | 南方电网科学研究院有限责任公司 | Method and device for arranging buried pipeline local grounding points |
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| CN107863767A (en) * | 2016-09-22 | 2018-03-30 | 中国石油天然气股份有限公司 | Oil-gas pipeline valve chamber earth protective device |
| 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 |
| CN114624532A (en) * | 2022-03-14 | 2022-06-14 | 华东交通大学 | Stray current corrosion resistant power grid detection device |
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| CN104852349B (en) | 2019-01-04 |
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