CN108819801B - A system and method for suppressing rail potential - Google Patents
A system and method for suppressing rail potential Download PDFInfo
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- CN108819801B CN108819801B CN201810730417.1A CN201810730417A CN108819801B CN 108819801 B CN108819801 B CN 108819801B CN 201810730417 A CN201810730417 A CN 201810730417A CN 108819801 B CN108819801 B CN 108819801B
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 71
- 239000010959 steel Substances 0.000 claims abstract description 71
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 230000001629 suppression Effects 0.000 claims abstract description 15
- 230000033228 biological regulation Effects 0.000 claims description 18
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 229910000746 Structural steel Inorganic materials 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000003137 locomotive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M5/00—Arrangements along running rails or at joints thereof for current conduction or insulation, e.g. safety devices for reducing earth currents
- B60M5/02—Means for reducing potential difference between rail and adjacent ground
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Abstract
本发明公开了一种钢轨电位抑制系统及方法，其系统包括：可调电阻单元、可编程控制器、反并联晶闸管模块和电压检测模块，可调电阻单元连接于钢轨和地网之间，反并联晶闸管模块与可调电阻单元并联，电压调节模块与可调电阻单元并联，可调电阻单元、反并联晶闸管模块、电压检测模块均与可编程控制器连接。本发明的钢轨电位抑制系统及方法可同时对钢轨电位和杂散电流进行抑制，可避免钢轨电位独立控制时杂散电流泄漏量过大，杂散电流独立控制时钢轨电位抬升严重的问题，有效降低钢轨电位对人身安全造成的危害，降低杂散电流对地铁结构钢筋及周围埋地管线的腐蚀危害，且能够降低设备成本，减少占用空间，提升控制效果。
The invention discloses a rail potential suppression system and method. The system comprises: an adjustable resistance unit, a programmable controller, an anti-parallel thyristor module and a voltage detection module. The adjustable resistance unit is connected between the rail and the ground grid, and the anti-parallel thyristor module The parallel thyristor module is connected in parallel with the adjustable resistance unit, the voltage adjustment module is connected in parallel with the adjustable resistance unit, and the adjustable resistance unit, the anti-parallel thyristor module and the voltage detection module are all connected with the programmable controller. The rail potential suppression system and method of the present invention can simultaneously suppress the rail potential and stray current, and can avoid the problems of excessive stray current leakage when the rail potential is independently controlled, and the rail potential rises seriously when the stray current is independently controlled. It can reduce the harm caused by the rail potential to personal safety, reduce the corrosion harm of stray current to the steel bars of the subway structure and the surrounding buried pipelines, and can reduce the cost of equipment, reduce the occupied space, and improve the control effect.
Description
Technical Field
The invention relates to the technical field of steel rail potential suppression, in particular to a steel rail potential suppression system and a steel rail potential suppression method.
Background
At present, the urban rail transit traction power supply system in China is powered by 750V or 1500V direct current, a locomotive obtains electric energy from a contact net, and traction current returns to the negative electrode of a rectifier unit of a traction substation through a running rail. Because the reflux track has resistance and the system adopts a suspension grounding mode, when the locomotive runs, a potential difference is formed between the steel rail and the ground, and the potential difference is called as the steel rail potential. If the potential is too high, the safety of the human body is seriously harmed. As complete insulation between the return current rail and the ground is difficult to ensure, and the insulation effect of the rail ground is gradually reduced along with the lengthening of operation time, partial return current leaks to the ground from the steel rail, and stray current is formed. Stray current can cause electrochemical corrosion to self rails, structural steel bars and accessory buried pipelines of subways, and potential hazards are caused to safe operation of urban rail transit.
At present, in order to restrain the rail potential and stray current of the operated subway lines at home and abroad, a rail potential limiting device and a drainage device are generally arranged in a substation. The rail potential limiting device is connected with the rail and the ground, and when the rail potential exceeding personal safety voltage is detected, the rail is in short circuit with the ground, and the rail potential is reduced. The drainage cabinet is connected to the ground, the structural steel bars and the negative bus of the substation (the bus is connected with the track), so that stray current in the structural steel bars and the ground flows back to the negative pole of the traction substation in a single direction, and the corrosion problem caused by the stray current is reduced. However, the method of independently suppressing the rail potential and the stray current proves more problems in the field operation process. When the steel rail potential limiting device is subjected to protective switching-on, a large amount of current is directly leaked to the ground, and the value is much larger than the current normally leaked during line operation, so that the problem of stray current corrosion is aggravated. When the drainage device drains, the potential difference between the earth or the structural steel bar and the negative bus can be reduced (the potential of the steel rail is a negative value during drainage), so that the potential of the full-line steel rail is raised, and the far-end steel rail potential limiting device frequently acts. The two can not be effectively controlled in a combined way, so that the control imbalance occurs when the potential of the steel rail and the stray current are inhibited, and the problems of the potential of the steel rail and the stray current can not be effectively solved.
Disclosure of Invention
In view of the shortcomings of the prior art, one of the objectives of the present invention is to provide a rail potential suppression system. The following technical scheme is adopted:
a rail potential suppression system, comprising: the adjustable resistance unit is connected between a steel rail and a ground grid, the anti-parallel thyristor module is connected with the adjustable resistance unit in parallel, the voltage adjusting module is connected with the adjustable resistance unit in parallel, and the adjustable resistance unit, the anti-parallel thyristor module and the voltage detecting module are all connected with the programmable controller.
As a further improvement of the invention, the system further comprises a fuse, which is connected in series with the adjustable resistance unit.
As a further improvement of the present invention, the system further comprises: and the current detection module is connected with the adjustable resistance unit in series and then is connected with the voltage detection module in parallel, and the current detection module is connected with the programmable controller.
As a further improvement of the invention, the adjustable resistance unit has an adjustment range of 0-500 Ω.
The second object of the present invention is to provide a method for suppressing rail potential. The following technical scheme is adopted:
a rail potential suppression method includes:
adjusting the resistance value of an adjustable resistance unit to the maximum, wherein the adjustable resistance unit is connected between the steel rail and the ground screen;
when the steel rail potential is a positive value and is greater than the quick-action voltage limit value, after the anti-parallel thyristor module is switched on, the resistance value of the adjustable resistance unit is adjusted to zero, then the anti-parallel thyristor module is switched off, the resistance value of the adjustable resistance unit is gradually increased, and meanwhile, the steel rail potential is detected in real time through the voltage detection module to enable the steel rail potential to be equal to the voltage adjustment limit value, wherein the anti-parallel thyristor module is connected with the adjustable resistance module in parallel;
and when the potential of the steel rail is a positive value, is greater than the voltage regulation limit value and is less than or equal to the quick-acting voltage limit value, the resistance value of the adjustable resistance unit is reduced, so that the potential of the steel rail is equal to the voltage regulation limit value.
As a further improvement of the present invention, the method further comprises:
when the potential of the steel rail is a negative value and is greater than the negative quick-action voltage limit value, after the anti-parallel thyristor module is switched on, the resistance value of the adjustable resistance unit is adjusted to zero, then the anti-parallel thyristor module is switched off, and the resistance value of the adjustable resistance unit is adjusted to enable the drainage current value to be equal to the stray current value;
and when the potential of the steel rail is a negative value, is greater than the negative voltage regulation limit value and is less than or equal to the negative snap voltage limit value, regulating the resistance value of the adjustable resistance unit to enable the drainage current value to be equal to the stray current value.
As a further improvement of the present invention, the method further comprises:
and when the potential of the steel rail is a positive value and is smaller than the quick-acting voltage limit value, the resistance value of the adjustable resistance unit is kept in a maximum state.
As a further improvement of the present invention, the method further comprises: the adjusting range of the adjustable resistance unit is 0-500 omega.
The invention has the beneficial effects that:
the steel rail potential suppression system and the method can simultaneously suppress the steel rail potential and the stray current, can avoid the problems of overlarge stray current leakage amount and serious steel rail potential lifting when the steel rail potential is independently controlled, effectively reduce the harm of the steel rail potential to the personal safety, reduce the corrosion harm of the stray current to the steel bar of the subway structure and the surrounding buried pipelines, and can reduce the equipment cost, reduce the occupied space and improve the control effect.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a rail potential suppression system according to an embodiment of the present invention.
Description of the labeling: c1: a programmable controller; c2An adjustable resistance unit; c3An anti-parallel thyristor module; c4A current detection module; c5A voltage detection module; c6A fuse.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
As shown in fig. 1, the rail potential suppression system according to the present embodiment includes: programmable controller C1Adjustable resistance unit C2Anti-parallel thyristor module C3Current detecting module C4Voltage detecting module C5Fuse C6。
Adjustable resistance unit C2Current detecting module C4And fuse C6The three are connected in series and then connected with a voltage detection module C5Parallel adjustable resistance unit C2Current detecting module C4And fuse C6The three are connected in series and then connected between the steel rail and the ground screen, and the thyristor module C is connected in anti-parallel3And an adjustable resistance unit C2Parallel adjustable resistance unit C2Anti-parallel thyristor module C3Current detecting module C4Voltage detecting module C5Are all connected with a programmable controller C1And (4) connecting.
Current detection module C4For detecting current signals and sending the detected current signals to the programmable controller C1Voltage detecting module C5For detecting a voltage signal and sending the detected voltage signal to the programmable controller C1Programmable controller C1Is used for receiving the current signal and the voltage signal and adjusting the anti-parallel thyristor module C according to the current signal and the voltage signal3State of and adjustable resistance unit C2The resistance value of (c).
The working process is as follows: firstly, the adjustable resistance unit C2The resistance value is adjusted to be maximum, and the voltage detection module C5Detecting the rail potential and sending to the programmable controller C1Programmable controller C1The identification is carried out after the steel rail potential signal is received, and when the steel rail potential is a positive value and is greater than the quick-action voltage limit value, the anti-parallel thyristor module C is connected3After being conducted, the adjustable resistance unit C is connected2The resistance value of the transistor is adjusted to zero, and then the anti-parallel thyristor module C is connected3Disconnect and gradually increase the adjustable resistance unit C2While passing through the voltage detection module C5Detecting the potential of the steel rail in real time to enable the potential of the steel rail to be equal to a voltage regulation limit value; when the potential of the steel rail is a positive value, is greater than the voltage regulation limit value and is less than or equal to the quick-acting voltage limit value, the programmable controller C1Turning down adjustable resistance unit C2The resistance value of (3) is used for making the potential of the steel rail equal to the voltage regulation limit value; when the potential of the steel rail is negative and is more than negativeTo the snap-action voltage limit, programmable controller C1The anti-parallel thyristor module C3Conducting and connecting the adjustable resistance unit C2Then, the anti-parallel thyristor module C is adjusted to zero3Disconnect and adjust the adjustable resistance unit C2And receive the current detection module C in real time4The current signal of (2) to make the drain current value equal to the stray current value; when the potential of the steel rail is a negative value, is greater than the negative voltage regulation limit value and is less than or equal to the negative snap voltage limit value, the programmable controller C1Adjusting an adjustable resistance unit C2And receive the current detection module C in real time4The drain current value is made equal to the stray current value.
In the present embodiment, the adjustable resistance unit C2Is in the range of 0-500 omega, in other embodiments of the present invention, the adjustable resistance unit C2The adjusting range of (2) can be arbitrarily set according to the requirement.
The method for suppressing the potential of the steel rail in the embodiment comprises the following steps:
step S10, adjusting the resistance value of the adjustable resistance unit to the maximum;
the adjustable resistance unit is connected between the steel rail and the ground grid, the resistance value of the adjustable resistance unit is adjusted to the maximum value in the initial state, the circuit can be effectively protected after the circuit is conducted, in the embodiment, a fuse is further connected between the steel rail and the ground grid, the fuse is connected with the adjustable resistance unit in series and used for protecting the circuit, the current of the protection circuit does not exceed the design limit value, and the safe operation of the circuit is guaranteed.
Step S21, when the steel rail potential is a positive value and is larger than the quick-acting voltage limit value, after the anti-parallel thyristor module is conducted, the resistance value of the adjustable resistance unit is adjusted to zero, then the anti-parallel thyristor module is disconnected, the resistance value of the adjustable resistance unit is gradually increased, and meanwhile, the steel rail potential is detected in real time through the voltage detection module to enable the steel rail potential to be equal to the voltage adjustment limit value;
the voltage snap limit value is 90V, and the voltage regulation limit value can be set, for example, 80V, when the voltage regulation limit value exceeds 80V, the adjustable resistance unit is regulated to maintain the voltage at 80V.
Specifically, detect the rail potential through the voltage detection module parallelly connected with adjustable resistance module, when the rail potential is the positive value, and is greater than the snap voltage limit value, probably take place the contact net short circuit, at this moment, with anti-parallelly connected thyristor module switch on be about to rail and earth mat short circuit.
And step S22, when the potential of the steel rail is a positive value, is greater than the voltage regulation limit value and is less than or equal to the quick-acting voltage limit value, the resistance value of the adjustable resistance unit is reduced, and the potential of the steel rail is equal to the voltage regulation limit value.
Specifically, when the voltage detection module detects that the potential of the steel rail is a positive value, the steel rail at the detection position leaks current to the ground, and drainage is not needed at the position. When the potential of the steel rail is a positive value, is greater than the voltage regulation limit value and is less than or equal to the quick-acting voltage limit value, the potential of the steel rail already exceeds the personal safety voltage limit value. The resistance of the adjustable resistance unit should be reduced to lower the rail potential.
Step S23, when the potential of the steel rail is a negative value and is larger than the negative quick-action voltage limit value, after the anti-parallel thyristor module is switched on, the resistance value of the adjustable resistance unit is adjusted to zero, then the anti-parallel thyristor module is switched off, and the resistance value of the adjustable resistance unit is adjusted to enable the drainage current value to be equal to the stray current value;
and step S24, when the potential of the steel rail is a negative value, is greater than the negative voltage regulation limit value and is less than or equal to the negative snap voltage limit value, the resistance value of the adjustable resistance unit is adjusted to enable the drainage current value to be equal to the stray current value.
Preferably, the method further comprises the steps of:
and when the potential of the steel rail is a positive value and is smaller than the voltage regulation limit value, the resistance value of the adjustable resistance unit is kept in a maximum state.
Specifically, when the potential of the steel rail is a positive value and is smaller than the voltage regulation limit value, the potential of the steel rail is lower than the personal safety voltage limit value, and the resistance of the adjustable resistance unit is regulated to be maximum, so that the leakage amount of current at the position is reduced.
The invention has the beneficial effects that:
the steel rail potential suppression system and the method can simultaneously suppress the steel rail potential and the stray current, can avoid the problems of overlarge stray current leakage amount and serious steel rail potential lifting when the steel rail potential is independently controlled, effectively reduce the harm of the steel rail potential to the personal safety, reduce the corrosion harm of the stray current to the steel bar of the subway structure and the surrounding buried pipelines, and can reduce the equipment cost, reduce the occupied space and improve the control effect.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (3)
1. A rail potential suppression method is characterized by comprising:
adjusting the resistance value of an adjustable resistance unit to the maximum, wherein the adjustable resistance unit is connected between the steel rail and the ground screen;
when the steel rail potential is a positive value and is greater than the quick-action voltage limit value, after the anti-parallel thyristor module is switched on, the resistance value of the adjustable resistance unit is adjusted to zero, then the anti-parallel thyristor module is switched off, the resistance value of the adjustable resistance unit is gradually increased, and meanwhile, the steel rail potential is detected in real time through the voltage detection module to enable the steel rail potential to be equal to the voltage adjustment limit value, wherein the anti-parallel thyristor module is connected with the adjustable resistance unit in parallel;
when the potential of the steel rail is a positive value, is greater than the voltage regulation limit value and is less than or equal to the quick-acting voltage limit value, the resistance value of the adjustable resistance unit is reduced, and the potential of the steel rail is equal to the voltage regulation limit value;
when the potential of the steel rail is a negative value and is greater than the negative quick-action voltage limit value, after the anti-parallel thyristor module is switched on, the resistance value of the adjustable resistance unit is adjusted to zero, then the anti-parallel thyristor module is switched off, and the resistance value of the adjustable resistance unit is adjusted to enable the drainage current value to be equal to the stray current value;
when the potential of the steel rail is a negative value, is greater than the negative voltage regulation limit value and is less than or equal to the negative snap-action voltage limit value, the resistance value of the adjustable resistance unit is adjusted to enable the drainage current value to be equal to the stray current value;
the current detection module is connected with the adjustable resistance unit in series and then connected with the voltage detection module in parallel, and the current detection module is connected with the programmable controller.
2. A rail potential suppression method according to claim 1, further comprising:
and when the potential of the steel rail is a positive value and is smaller than the quick-acting voltage limit value, the resistance value of the adjustable resistance unit is kept in a maximum state.
3. A rail potential suppressing method according to any one of claims 1 to 2, further comprising: the adjusting range of the adjustable resistance unit is 0-500 omega.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810730417.1A CN108819801B (en) | 2018-07-05 | 2018-07-05 | A system and method for suppressing rail potential |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810730417.1A CN108819801B (en) | 2018-07-05 | 2018-07-05 | A system and method for suppressing rail potential |
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| CN108819801A CN108819801A (en) | 2018-11-16 |
| CN108819801B true CN108819801B (en) | 2021-06-01 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109703418B (en) * | 2019-02-13 | 2024-05-28 | 盾石磁能科技有限责任公司 | System and method for solving potential problem of steel rail by using energy storage device |
| CN109941154B (en) * | 2019-03-25 | 2021-11-19 | 合肥华威自动化有限公司 | System and method for limiting rail voltage |
| CN110209232B (en) * | 2019-05-14 | 2020-07-24 | 中国矿业大学 | Direct-current electronic load three-closed-loop control method for limiting rail voltage |
| CN112366673A (en) * | 2020-12-03 | 2021-02-12 | 青岛地铁科技有限公司 | Operation overvoltage suppression circuit and method for steel rail potential limiting device |
| CN112968306B (en) * | 2021-02-02 | 2021-10-19 | 西南交通大学 | Self-adaptive adjustable resistance grounding system suitable for electric rail transit |
| CN113541113B (en) * | 2021-06-11 | 2025-03-04 | 广州燃气集团有限公司 | A method and device for draining stray current from a stray current drainer |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201646441U (en) * | 2010-03-25 | 2010-11-24 | 中国矿业大学 | A Track Potential Limiting Device |
| DE102009043229A1 (en) * | 2009-09-28 | 2011-03-31 | Siemens Aktiengesellschaft | Short-circuiting device |
| CN102209648A (en) * | 2008-09-30 | 2011-10-05 | 西门子公司 | Device and method for limiting the rail potential in a DC railway |
| CN102210077A (en) * | 2008-09-30 | 2011-10-05 | 西门子公司 | Device and method for limiting the rail potential in a DC railway |
| CN202541352U (en) * | 2012-04-25 | 2012-11-21 | 上海拓及轨道交通设备有限公司 | Steel rail electric potential protective device |
| CN105009397A (en) * | 2013-03-07 | 2015-10-28 | 德恩及索恩两合股份有限公司 | Overvoltage protection device with short-circuit function for protecting systems and persons |
-
2018
- 2018-07-05 CN CN201810730417.1A patent/CN108819801B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102209648A (en) * | 2008-09-30 | 2011-10-05 | 西门子公司 | Device and method for limiting the rail potential in a DC railway |
| CN102210077A (en) * | 2008-09-30 | 2011-10-05 | 西门子公司 | Device and method for limiting the rail potential in a DC railway |
| DE102009043229A1 (en) * | 2009-09-28 | 2011-03-31 | Siemens Aktiengesellschaft | Short-circuiting device |
| CN201646441U (en) * | 2010-03-25 | 2010-11-24 | 中国矿业大学 | A Track Potential Limiting Device |
| CN202541352U (en) * | 2012-04-25 | 2012-11-21 | 上海拓及轨道交通设备有限公司 | Steel rail electric potential protective device |
| CN105009397A (en) * | 2013-03-07 | 2015-10-28 | 德恩及索恩两合股份有限公司 | Overvoltage protection device with short-circuit function for protecting systems and persons |
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