CN104852349B - Overvoltage protection device for natural gas pipeline system - Google Patents
Overvoltage protection device for natural gas pipeline system Download PDFInfo
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- CN104852349B CN104852349B CN201510188835.9A CN201510188835A CN104852349B CN 104852349 B CN104852349 B CN 104852349B CN 201510188835 A CN201510188835 A CN 201510188835A CN 104852349 B CN104852349 B CN 104852349B
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- switch
- natural gas
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- gas pipeline
- voltage
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 239000003345 natural gas Substances 0.000 title claims abstract description 44
- 230000004224 protection Effects 0.000 title claims abstract description 23
- 230000005611 electricity Effects 0.000 claims 4
- 238000006056 electrooxidation reaction Methods 0.000 abstract description 5
- 230000007774 longterm Effects 0.000 abstract description 3
- 230000001012 protector Effects 0.000 abstract 1
- 239000002689 soil Substances 0.000 description 13
- 238000009413 insulation Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 208000033748 Device issues Diseases 0.000 description 4
- 238000004210 cathodic protection Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 2
- 238000010892 electric spark Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000001154 acute effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Landscapes
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention provides an overvoltage protection device for a natural gas pipeline system, the natural gas pipeline system comprising: the cathode protection device is connected with the natural gas pipeline through a first lead; this overvoltage protector includes: a first switch disposed on the first wire; the grounding device is connected with the natural gas pipeline through a second lead; a second switch disposed on the second wire; a voltage measuring device connected to both ends of the second switch; and a control device for comparing the voltage measured by the voltage measuring device with a preset operating voltage and controlling the operation of the first switch and the second switch according to the comparison result. The invention not only keeps the limit value of the ground potential difference of the pipe of the pipeline at the valve chamber within the safety value, thereby ensuring the personal safety and the operation safety of the equipment at the valve chamber, but also avoids the problem of aggravated electrochemical corrosion caused by the inflow and outflow of stray current of the pipeline for long-term grounding.
Description
Technical field
The present invention relates to a kind of over-pressure safety devices for Natural gas pipeline system.
Background technique
In recent years, with rapid economic development, energy demand rapid growth, remote, high-capacity direct current power transmission engineering and
Gas transmission, Oil Transportation Pipeline Engineering all rapidly develop.China's shortage of land resource, DC transmission engineering earthing pole and buried metal pipeline
In many local close proximities, natural gas metallic conduit will inevitably be influenced by direct current grounding pole earth current.When
When DC power transmission system unifies pole failure or maintenance, DC transmission system will temporarily use the monopolar ground return method of operation.Straight
Flow the transmission system monopolar ground return method of operation under, direct current grounding pole can into soil Injection Current, it will cause nearby soil
The variation of earth current potential.When being embedded with metallic conduit in neighbouring soil, direct current grounding pole earth current will generate on pipeline
Induced potential, causing pipeline with near-earth soil, there are potential differences, to cause pipeline pipe to soil potential difference excessive, reach as high as several hundred
Volt, and the current potential promotion speed of pipeline is fast.Excessive pipe to soil potential difference will cause on pipeline pipe-line equipment at point defeated station or valve chamber,
Operation operating personnel causes damages.It may cause the generation of following several accidents:
1, the original pressure cathodic protection system of natural gas line or other pipe protection equipment are destroyed.
2, to the insulation sleeve both ends on gas-oil valve impulse pipeline generate larger potential difference (insulation sleeve both ends,
One end is pipeline current potential, and one end is ground potential), so that it is generated spark discharge, has larger threat to the safety of natural gas line, it can
Fire or explosion accident can occur.
3, property dangerous to the maintenance personnel of natural gas line, is easy to make in the case where not dressing insulating glove (shoes)
At electric shock accidents.
Direct current grounding pole earth current has a characteristic that the time does not know (failure or maintenance to natural gas line influence
Period occurs), action time is short (several hours), and earth current amplitude is big (upper kiloampere), and positive-negative polarity is uncertain, causes pipe
The features such as road potential shift is violent.Currently, electric power and the fractional unit of petroleum industry have appreciated that direct current grounding pole at home
The seriousness that earth current influences buried metal pipeline, but interfered according to customary DC and take measures to insulate such as duct segments
Method and cathode current Protection Code etc. are difficult to reduce at pipeline valve chamber potential drop as low as in safety limit；Pipeline drainage protection side
Method can make the pipe to soil potential difference of pipeline at grounding point be reduced to safe limit if pipeline is through band-like zinc alloy anode electric drainage by grounding
In value, but the mode of long-term electric drainage by grounding will cause long-term stray electrical current and flow into, flow out pipeline, and pipeline electrochemical corrosion is caused to add
It is acute.
Summary of the invention
In view of the shortcomings of the prior art, the object of the present invention is to provide a kind of overvoltage protections for Natural gas pipeline system
Device.
To achieve the goals above, the present invention provides a kind of over-pressure safety device for Natural gas pipeline system, days
Right feed channel system includes: natural gas line, cathode protection device, and cathode protection device and natural gas line pass through the first conducting wire
Connection；The over-pressure safety device includes:
First switch is set on the first conducting wire；
Earthing or grounding means is connect by the second conducting wire with natural gas line；
Second switch is set on the second conducting wire；
Voltage measuring apparatus is connected to the both ends of second switch；
The measured voltage of voltage measuring apparatus is compared by control device with preset operation voltage,
And the movement of first switch and the second switch is controlled according to comparison result.
In the present invention, natural gas line is protected by cathode protection device.Under normal circumstances, the voltage of natural gas line is strong
It is to be always held in the range of -0.85V to -1.25V under conditions of cathodic protection processed.
In the present invention, Natural gas pipeline system further comprises impulse pipeline, and impulse pipeline is the branch of natural gas line,
As main pipeline current potential, impulse pipeline is connect by insulation sleeve with controllable valve (such as gas-oil valve) its current potential,
Valve end ground connection.
In the present invention, the earthing or grounding means of over-pressure safety device can be, such as ground stud near valve chamber grounded screen or valve chamber.
Working principle of the present invention is as follows: when natural gas line is influenced by shape high voltage DC earthing pole earth current,
The pipe ground voltage of pipeline increases, when (such as valve chamber grounded screen or valve chamber are nearby grounded for second switch both ends pipeline and earthing or grounding means
Stake) between voltage when reaching U (U be preset operation voltage), control device issues instruction, and control second switch exists
Closure, makes the pipeline at second switch both ends be connected with earthing or grounding means, thus with reducing the pipe of natural gas line electric in 100ms
Pressure, the electric current on natural gas line will flow to the earth from natural gas line at this time, flow through the maximum current of second switch up to several
Hundred amperes.When second switch is closed, while first switch disconnection is controlled, to protect the safety of cathode protection device, from pipeline
The influence of overvoltage.When the voltage between second switch both ends pipeline and earthing or grounding means drops to U, control device issues instruction,
Control second switch disconnects in 100ms, the connection between natural gas line and earthing or grounding means is disconnected, while first switch is closed
It closes, cathode protection device puts into operation, continues the operational safety for protecting natural gas line.
The present invention is both by the pipe to soil potential difference limit value of pipeline at valve chamber within safety value, to guarantee personal safety and valve
Equipment operational safety at room, also avoid pipeline and be grounded stray electrical current for a long time flowing into, flow out, caused by electrochemical corrosion aggravate
Problem.
Another specific embodiment according to the present invention, first switch and the second switch are linked switch；When first switch is closed
When conjunction, second switch is disconnected；When second switch closure, first switch is disconnected.
Another specific embodiment, first switch and the second switch are equipped with lightning protection device according to the present invention, to prevent
Only the device of the invention is damaged under lightning surge.
Another specific embodiment according to the present invention, first switch and the second switch are obturator, to prevent because opening
When power-off stream, the electric spark between switch contacts causes natural gas in valve chamber to fire.
Another specific embodiment according to the present invention, earthing or grounding means are connected to the natural gas line at valve chamber.
The actuation time of another specific embodiment according to the present invention, first switch and the second switch is less than 100ms.
Another specific embodiment according to the present invention, the operation voltage of first switch and the second switch are 30V-60V, can
It sets, adjust according to demand.
Another specific embodiment according to the present invention, second switch allow by maximum current be 200A-800A.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, customary DC interference suppression measure such as duct segments insulation method and cathode current Protection Code etc., is difficult that pipe will be reduced
Potential drop is as low as in safety limit at road valve chamber；And over-pressure safety device of the invention is more than safety in the pipe to soil potential difference of pipeline
After limit value, pipeline at valve chamber is grounded, the pipe to soil potential that can effectively reduce at valve chamber is poor, it is ensured that pipe-line equipment and operation are made
Industry personnel safety.
2, conventional pipeline drainage protection method can make at grounding point if pipeline is through band-like zinc alloy anode electric drainage by grounding
The pipe to soil potential difference of pipeline is reduced in safety limit, but pipeline is grounded not only results in cathodic protection current on pipeline for a long time
It is lost, the protection scope of pipeline cathode protection equipment is caused to reduce, it is (high by grounding point to will also result in excessive stray electrical current
Electric current caused by iron, subway) it flows into, flow out pipeline, cause pipeline electrochemical corrosion to aggravate.Over-pressure safety device of the invention is only
After the pipe to soil potential difference in pipeline is more than safety limit, just pipeline at valve chamber is grounded, and (no earth current under normal condition
When effect), the device of the invention does not change the operating status of pipeline, and pipeline keeps normal state of insulation, do not have excessive
Stray electrical current flows into, flows out pipeline, will not aggravate pipeline electrochemical corrosion.
3, the device of the invention is easy for installation, and capital investment is less, to pipeline accidental conditions substantially without change, is easy to
Natural gas pipeline companies receive.
4, pipeline pipe to soil potential is poor, action situations of apparatus of the present invention, conduit running situation (ground connection, insulation) can pass in real time
It is sent to conduit running supervision department, conduit running supervision department can grasp conduit running situation in real time.
The present invention is described in further detail with reference to the accompanying drawing.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the Natural gas pipeline system of the over-pressure safety device of Application Example 1.
Specific embodiment
Embodiment 1
As shown in Figure 1, the Natural gas pipeline system of the over-pressure safety device of Application Example 1 include: natural gas line 1,
Cathode protection device 2, impulse pipeline 3.
Wherein, cathode protection device 2 is connect with natural gas line 1 by the first conducting wire.Impulse pipeline 3 is natural gas line
1 branch, current potential is as 1 current potential of natural gas line, and by insulation sleeve 301 and controllable valve, (gas-liquid joins impulse pipeline 3
Dynamic ball valve 302) connection, valve end ground connection.
Over-pressure safety device include: first switch T1, earthing or grounding means 4, voltage measuring apparatus 5, control device (in figure not
Show).Wherein, first switch T1 is set on the first conducting wire.Earthing or grounding means 4 is connect by the second conducting wire with natural gas line 1,
The natural gas line being connected at valve chamber.Second switch T2 is set on the second conducting wire；Voltage measuring apparatus 5 is connected to second and opens
Close the both ends of T2.
First switch T1 and second switch T2 is linked switch；When first switch T1 closure, second switch T2 is disconnected；When
When second switch T2 is closed, first switch T1 is disconnected.First switch T1 and second switch T2 are equipped with lightning protection device.First
Switch T1 and second switch T2 is obturator, and when preventing because of drop-out current, the electric spark between switch contacts causes valve chamber
Interior natural gas fires.The actuation time of first switch T1 and second switch T2 are less than 100ms.First switch T1 and second switch T2
Operation voltage U be, for example, 40V.Second switch T2 allow by maximum current be, for example, 500A.
The measured voltage of voltage measuring apparatus is compared by control device with preset operation voltage U, and
The movement of first switch and the second switch is controlled according to comparison result.Specifically, working as voltage measured by voltage measuring apparatus
When greater than 40V, control device issues instruction, and control second switch T2 is closed in 100ms, while it is disconnected to control first switch T1
It opens；When the voltage measured by the voltage measuring apparatus drops to 40V, control device issues instruction, controls second switch T2 in 100ms
Interior disconnection, while first switch T1 is closed,
Although the present invention is disclosed above in the preferred embodiment, it is not intended to limit the invention the range of implementation.Any
The those of ordinary skill in field is not departing from invention scope of the invention, improves when can make a little, i.e., all according to this hair
Bright done same improvement, should be the scope of the present invention and is covered.
Claims (5)
1. a kind of over-pressure safety device for Natural gas pipeline system, the Natural gas pipeline system include: natural gas line,
Cathode protection device, the cathode protection device are connect with the natural gas line by the first conducting wire；It is characterized in that, described
Over-pressure safety device includes:
First switch is set on first conducting wire；
Earthing or grounding means is connect by the second conducting wire with the natural gas line；
Second switch is set on second conducting wire；
Voltage measuring apparatus is connected to the both ends of the second switch；
Control device, when the virtual voltage that the voltage measuring apparatus measures the second switch is greater than preset movement electricity
When pressure, the control device controls the second switch and is closed in 100ms, while controlling the first switch and disconnecting；Work as institute
It is described when stating voltage measuring apparatus and measuring the near preset operation voltage of virtual voltage and following values of the second switch
Control device controls the second switch and disconnects in 100ms, while the first switch is closed.
2. over-pressure safety device according to claim 1, which is characterized in that the preset movement electricity of second switch
Pressure is a certain numerical value during 30V-60V in range.
3. over-pressure safety device according to claim 2, which is characterized in that the preset movement electricity of second switch
Pressure is 40V.
4. over-pressure safety device according to claim 1, which is characterized in that the second switch allow by maximum electricity
A certain numerical value during stream is 200A-800A in range.
5. over-pressure safety device according to claim 1, which is characterized in that the first switch and the second switch are equal
Equipped with lightning protection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510188835.9A CN104852349B (en) | 2015-04-20 | 2015-04-20 | Overvoltage protection device for natural gas pipeline system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510188835.9A CN104852349B (en) | 2015-04-20 | 2015-04-20 | Overvoltage protection device for natural gas pipeline system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104852349A CN104852349A (en) | 2015-08-19 |
| CN104852349B true CN104852349B (en) | 2019-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510188835.9A Active CN104852349B (en) | 2015-04-20 | 2015-04-20 | Overvoltage protection device for natural gas pipeline system |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974175B (en) * | 2016-04-29 | 2018-08-03 | 南方电网科学研究院有限责任公司 | Method and device for arranging local grounding point of buried pipeline |
| 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 |
| 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 ground protection device |
| CN114624532B (en) * | 2022-03-14 | 2024-06-18 | 国网湖北省电力有限公司荆州供电公司 | Power grid detection equipment resistant to stray current corrosion |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN204497723U (en) * | 2015-04-20 | 2015-07-22 | 南方电网科学研究院有限责任公司 | Overvoltage protection device for natural gas pipeline system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2355681B1 (en) * | 2008-02-15 | 2011-11-21 | Juan Manuel Montero Meló | DOWNLOAD OF POLARIZED INTERVALS AND OVERVOLTAGES FOR CONTINUOUS CURRENT RAILWAY LINES. |
| CN203103937U (en) * | 2012-06-14 | 2013-07-31 | 陕西凌雷电气有限公司 | Multifunctional solid decoupler |
| CN204068229U (en) * | 2014-09-05 | 2014-12-31 | 成都市三为技术有限责任公司 | Pipeline intelligent decoupling device |
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- 2015-04-20 CN CN201510188835.9A patent/CN104852349B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN204497723U (en) * | 2015-04-20 | 2015-07-22 | 南方电网科学研究院有限责任公司 | Overvoltage protection device for natural gas pipeline system |
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| CN104852349A (en) | 2015-08-19 |
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