CN108819801A - A kind of rail potential inhibition system and method - Google Patents
A kind of rail potential inhibition system and method Download PDFInfo
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- CN108819801A CN108819801A CN201810730417.1A CN201810730417A CN108819801A CN 108819801 A CN108819801 A CN 108819801A CN 201810730417 A CN201810730417 A CN 201810730417A CN 108819801 A CN108819801 A CN 108819801A
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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 includes: an adjustable resistance unit, a programmable controller, an anti-parallel thyristor module and a voltage detection module. The parallel thyristor module is connected in parallel with the adjustable resistance unit, the voltage regulation module is connected in parallel with the adjustable resistance unit, and the adjustable resistance unit, the antiparallel 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 suppress the rail potential and stray current at the same time, and can avoid the problems of excessive stray current leakage when the rail potential is independently controlled, and the serious rise of the rail potential when the stray current is independently controlled, effectively Reduce the hazards of rail potential to personal safety, reduce the corrosion hazards of stray currents to subway structural steel bars and surrounding buried pipelines, and can reduce equipment costs, reduce space occupation, and improve control effects.
Description
技术领域technical field
本发明涉及钢轨电位抑制技术领域，特别涉及一种钢轨电位抑制系统及方法。The invention relates to the technical field of rail potential suppression, in particular to a rail potential suppression system and method.
背景技术Background technique
目前国内城市轨道交通牵引供电系统均采用直流750V或1500V供电，机车由接触网获得电能，牵引电流通过行车轨道返回到牵引变电所整流机组负极。由于回流轨道自身存在电阻，且系统采用悬浮接地方式，机车运行时，会在钢轨与地之间形成电位差，称为钢轨电位。如果该电位过高，会对人身安全产生严重危害。由于回流轨道与大地之间很难保证完全绝缘，而且随着运营时间加长，轨地绝缘效果逐步下降，会有部分回流电流由钢轨泄漏至大地，形成杂散电流。杂散电流会对地铁自身轨道、结构钢筋及附件埋地管线产生电化学腐蚀，对城市轨道交通安全运营造成隐患。At present, domestic urban rail transit traction power supply systems all use DC 750V or 1500V power supply. The locomotive obtains electric energy from the catenary, and the traction current returns to the negative pole of the rectifier unit of the traction substation through the driving track. Due to the resistance of the return track itself, and the system adopts the suspension grounding method, when the locomotive is running, a potential difference will be formed between the rail and the ground, which is called the rail potential. If the potential is too high, it will cause serious harm to personal safety. Since it is difficult to ensure complete insulation between the return rail and the ground, and as the operating time increases, the insulation effect of the rail and ground gradually decreases, and part of the return current will leak from the rail to the earth, forming stray currents. Stray currents will cause electrochemical corrosion to the subway's own tracks, structural steel bars, and accessory buried pipelines, which will pose hidden dangers to the safe operation of urban rail transit.
目前，国内外已运营的地铁线路为抑制钢轨电位与杂散电流，在变电所中普遍设有钢轨电位限制装置及排流装置。钢轨电位限制装置连接钢轨与大地，当检测到钢轨电位超过人身安全电压时，将轨道与大地短接，降低钢轨电位。排流柜连接于大地、结构钢筋与变电所负母线(该母线与轨道连接)，使结构钢筋与大地中的杂散电流单方向流回牵引变电所负极，减小杂散电流造成的腐蚀问题。但钢轨电位与杂散电流各自独立抑制的方法在现场运营过程中证实出现较多问题。钢轨电位限制装置在进行保护性合闸时，会有大量电流直接泄漏至大地，该数值比线路运行正常泄漏的电流大的多，导致杂散电流腐蚀问题加剧。排流装置在进行排流时，会减小大地或结构钢筋与负母线之间的电位差(排流时钢轨电位为负值)，导致全线钢轨电位抬升，远端钢轨电位限制装置频繁动作。两者不能有效的联合控制，使钢轨电位与杂散电流抑制时出现控制失调，不能有效解决钢轨电位与杂散电流问题。At present, in order to suppress the rail potential and stray current in the subway lines that have been operated at home and abroad, rail potential limiting devices and drainage devices are generally installed in substations. The rail potential limiting device connects the rail to the ground, and when it detects that the rail potential exceeds the personal safety voltage, it short-circuits the rail to the ground to reduce the rail potential. The discharge cabinet is connected to the ground, the structural steel bar and the negative busbar of the substation (the busbar is connected to the track), so that the stray current in the structural steel bar and the ground flows back to the negative pole of the traction substation in one direction, reducing the damage caused by the stray current corrosion problem. However, the method of independently suppressing rail potential and stray current has proved to have many problems in the field operation process. When the rail potential limiting device performs protective closing, a large amount of current will directly leak to the ground, which is much larger than the current leaked during normal line operation, which will lead to aggravated stray current corrosion. When the drainage device is performing drainage, it will reduce the potential difference between the ground or structural steel bars and the negative busbar (the rail potential is negative during drainage), which will cause the potential of the entire rail to rise, and the remote rail potential limiting device will frequently operate. The two cannot be effectively combined to control, so that control imbalance occurs when the rail potential and stray current are suppressed, and the problem of rail potential and stray current cannot be effectively solved.
发明内容Contents of the invention
针对现有技术的不足，本发明目的之一在于提供一种钢轨电位抑制系统。采用如下技术方案：In view of the deficiencies in the prior art, one of the purposes of the present invention is to provide a rail potential suppression system. Adopt the following technical solutions:
一种钢轨电位抑制系统，其包括：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，所述可调电阻单元连接于钢轨和地网之间，所述反并联晶闸管模块与所述可调电阻单元并联，所述电压调节模块与可调电阻单元并联，所述可调电阻单元、反并联晶闸管模块、电压检测模块均与所述可编程控制器连接。A rail potential suppression system, which includes: 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 It 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.
作为本发明的进一步改进，该系统还包括:熔断器，所述熔断器与可调电阻单元串联。As a further improvement of the present invention, the system also includes: a fuse connected in series with the adjustable resistance unit.
作为本发明的进一步改进，该系统还包括：电流检测模块，所述电流检测模块与可调电阻单元串联后与所述电压检测模块并联，所述电流检测模块与所述可编程控制器连接。As a further improvement of the present invention, the system further includes: a current detection module, the current detection module is connected in parallel with the voltage detection module after being connected in series with the adjustable resistance unit, and the current detection module is connected with the programmable controller.
作为本发明的进一步改进，所述可调电阻单元的调节范围为0-500Ω。As a further improvement of the present invention, the adjustment range of the adjustable resistance unit is 0-500Ω.
本发明目的之二在于提供一种钢轨电位抑制方法。采用如下技术方案：The second object of the present invention is to provide a rail potential suppression method. Adopt the following technical solutions:
一种钢轨电位抑制方法，其包括：A rail potential suppression method, comprising:
将可调电阻单元的阻值调至最大，其中，所述可调电阻单元连接于钢轨和地网之间；Adjusting the resistance value of the adjustable resistance unit to the maximum, wherein the adjustable resistance unit is connected between the rail and the ground grid;
当所述钢轨电位为正值，且大于速动电压限值时，将反并联晶闸管模块导通后，将所述可调电阻单元的阻值调至零，接着，将反并联晶闸管模块断开，并逐渐增加所述可调电阻单元的阻值，同时，通过电压检测模块实时检测钢轨电位，使钢轨电位等于电压调节限值，其中，所述反并联晶闸管模块与所述可调电阻模块并联；When the rail potential is positive and greater than the snap voltage limit, after the anti-parallel thyristor module is turned on, the resistance of the adjustable resistance unit is adjusted to zero, and then the anti-parallel thyristor module is disconnected , and gradually increase the resistance value of the adjustable resistance unit, and at the same time, detect the rail potential in real time through the voltage detection module, so that the rail potential is equal to the voltage regulation limit, wherein the anti-parallel thyristor module is connected in parallel with the adjustable resistance module ;
当所述钢轨电位为正值，且大于电压调节限值并小于等于速动电压限值时，调低所述可调电阻单元的阻值，使钢轨电位等于电压调节限值。When the rail potential is positive and greater than the voltage regulation limit and less than or equal to the snap voltage limit, lower the resistance of the adjustable resistance unit so that the rail potential is equal to the voltage regulation limit.
作为本发明的进一步改进，该方法还包括：As a further improvement of the present invention, the method also includes:
当所述钢轨电位为负值，且大于负向速动电压限值时，将反并联晶闸管模块导通后，将所述可调电阻单元的阻值调至零，接着，将反并联晶闸管模块断开，并调节所述可调电阻单元的阻值使排流电流值等于杂散电流值；When the rail potential is negative and greater than the negative snap voltage limit, after the anti-parallel thyristor module is turned on, the resistance of the adjustable resistance unit is adjusted to zero, and then the anti-parallel thyristor module is turned on Disconnect, and adjust the resistance value of the adjustable resistance unit so that the drain current value is equal to the stray current value;
当所述钢轨电位为负值，且大于负向电压调节限值并小于等于负向速动电压限值时，调节所述可调电阻单元的阻值使排流电流值等于杂散电流值。When the rail potential is negative and greater than the negative voltage adjustment limit and less than or equal to the negative snap voltage limit, adjust the resistance of the adjustable resistance unit so that the drain current value is equal to the stray current value.
作为本发明的进一步改进，该方法还包括：As a further improvement of the present invention, the method also includes:
当所述钢轨电位为正值，且小于速动电压限值时，将可调电阻单元的阻值保持在最大状态。When the potential of the rail is positive and less than the limit value of the snap voltage, the resistance value of the adjustable resistance unit is kept at the maximum state.
作为本发明的进一步改进，该方法还包括：所述可调电阻单元的调节范围为0-500Ω。As a further improvement of the present invention, the method further includes: the adjustment range of the adjustable resistance unit is 0-500Ω.
本发明的有益效果：Beneficial effects of the present invention:
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 rail potential suppression system and method of the present invention can suppress the rail potential and stray current at the same time, and can avoid the problems of excessive stray current leakage when the rail potential is independently controlled, and the serious rise of the rail potential when the stray current is independently controlled, effectively Reduce the hazards of rail potential to personal safety, reduce the corrosion hazards of stray currents to subway structural steel bars and surrounding buried pipelines, and can reduce equipment costs, reduce space occupation, and improve control effects.
上述说明仅是本发明技术方案的概述，为了能够更清楚了解本发明的技术手段，而可依照说明书的内容予以实施，并且为了让本发明的上述和其他目的、特征和优点能够更明显易懂，以下特举较佳实施例，并配合附图，详细说明如下。The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings.
附图说明Description of drawings
图1是本发明实施例中钢轨电位抑制系统的结构示意图。Fig. 1 is a schematic structural diagram of a rail potential suppression system in an embodiment of the present invention.
标记说明：C1：可编程控制器；C2:可调电阻单元；C3:反并联晶闸管模块；C4:电流检测模块；C5:电压检测模块；C6:熔断器。Marking instructions: C 1 : programmable controller; C 2 : adjustable resistance unit; C 3 : anti-parallel thyristor module; C 4 : current detection module; C 5 : voltage detection module; C 6 : fuse.
具体实施方式Detailed ways
下面结合附图和具体实施例对本发明作进一步说明，以使本领域的技术人员可以更好地理解本发明并能予以实施，但所举实施例不作为对本发明的限定。The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.
如图1所示，为本实施例中的钢轨电位抑制系统，该系统包括：可编程控制器C1、可调电阻单元C2、反并联晶闸管模块C3、电流检测模块C4、电压检测模块C5、熔断器C6。As shown in Figure 1, it is the rail potential suppression system in this embodiment, which includes: programmable controller C 1 , adjustable resistance unit C 2 , anti-parallel thyristor module C 3 , current detection module C 4 , voltage detection Module C 5 , fuse C 6 .
可调电阻单元C2、电流检测模块C4和熔断器C6三者串联后与电压检测模块C5并联，可调电阻单元C2、电流检测模块C4和熔断器C6三者串联后连接于钢轨和地网之间，反并联晶闸管模块C3与可调电阻单元C2并联，可调电阻单元C2、反并联晶闸管模块C3、电流检测模块C4、电压检测模块C5均与可编程控制器C1连接。The adjustable resistance unit C 2 , the current detection module C 4 and the fuse C 6 are connected in parallel with the voltage detection module C 5 in series, and the adjustable resistance unit C 2 , the current detection module C 4 and the fuse C 6 are connected in series Connected between the rail and the ground grid, the anti-parallel thyristor module C 3 is connected in parallel with the adjustable resistance unit C 2 , the adjustable resistance unit C 2 , the anti-parallel thyristor module C 3 , the current detection module C 4 , and the voltage detection module C 5 are all Connect with programmable controller C1 .
电流检测模块C4用于检测电流信号并将检测到的电流信号发送至可编程控制器C1，电压检测模块C5用于检测电压信号并将检测到的电压信号发送至可编程控制器C1，可编程控制器C1用于接收上述电流信号和电压信号，并根据上述电流信号和电压信号调节反并联晶闸管模块C3的状态和可调电阻单元C2的阻值。The current detection module C4 is used to detect the current signal and send the detected current signal to the programmable controller C1 , and the voltage detection module C5 is used to detect the voltage signal and send the detected voltage signal to the programmable controller C 1. The programmable controller C1 is used to receive the above-mentioned current signal and voltage signal, and adjust the state of the anti - parallel thyristor module C3 and the resistance value of the adjustable resistance unit C2 according to the above - mentioned current signal and voltage signal.
其工作流程如下：先将可调电阻单元C2的阻值调至最大，电压检测模块C5检测钢轨电位并发送至可编程控制器C1，可编程控制器C1接收到钢轨电位信号后进行识别，当钢轨电位为正值，且大于速动电压限值时，将反并联晶闸管模块C3导通后，将可调电阻单元C2的阻值调至零，接着将反并联晶闸管模块C3断开，并逐渐增加可调电阻单元C2的阻值，同时，通过电压检测模块C5实时检测钢轨电位，使钢轨电位等于电压调节限值；当钢轨电位为正值，且大于电压调节限值并小于等于速动电压限值时，可编程控制器C1调低可调电阻单元C2的阻值，使钢轨电位等于电压调节限值；当钢轨电位为负值，且大于负向速动电压限值时，可编程控制器C1将反并联晶闸管模块C3导通，并将可调电阻单元C2的阻值调至零，接着，将反并联晶闸管模块C3断开，并调节可调电阻单元C2的阻值，并实时接收电流检测模块C4的电流信号，使排流电流值等于杂散电流值；当钢轨电位为负值，且大于负向电压调节限值并小于等于负向速动电压限值时，可编程控制器C1调节可调电阻单元C2的阻值，并实时接收电流检测模块C4的电流信号，使排流电流值等于杂散电流值。The working process is as follows: first adjust the resistance value of the adjustable resistance unit C 2 to the maximum, the voltage detection module C 5 detects the rail potential and sends it to the programmable controller C 1 , after the programmable controller C 1 receives the rail potential signal To identify, when the rail potential is positive and greater than the snap voltage limit, turn on the anti-parallel thyristor module C 3 , adjust the resistance of the adjustable resistance unit C 2 to zero, and then turn the anti-parallel thyristor module C 3 is disconnected, and the resistance value of the adjustable resistance unit C 2 is gradually increased. At the same time, the rail potential is detected in real time through the voltage detection module C 5 , so that the rail potential is equal to the voltage adjustment limit; when the rail potential is positive and greater than the voltage When the adjustment limit is less than or equal to the snap voltage limit, the programmable controller C 1 lowers the resistance of the adjustable resistance unit C 2 to make the rail potential equal to the voltage adjustment limit; when the rail potential is negative and greater than the negative When the voltage reaches the limit value of the quick action, the programmable controller C 1 turns on the anti-parallel thyristor module C 3 and adjusts the resistance value of the adjustable resistance unit C 2 to zero, and then disconnects the anti-parallel thyristor module C 3 , and adjust the resistance value of the adjustable resistance unit C 2 , and receive the current signal of the current detection module C 4 in real time, so that the discharge current value is equal to the stray current value; when the rail potential is negative and greater than the negative voltage adjustment limit When the value is less than or equal to the negative snap voltage limit, the programmable controller C1 adjusts the resistance value of the adjustable resistance unit C2 , and receives the current signal of the current detection module C4 in real time, so that the drain current value is equal to the stray current value.
在本实施例中，可调电阻单元C2的调节范围为0-500Ω，在本发明的其他实施例中，可调电阻单元C2的调节范围可以根据需要任意设置。In this embodiment, the adjustment range of the adjustable resistance unit C 2 is 0-500Ω, and in other embodiments of the present invention, the adjustment range of the adjustable resistance unit C 2 can be set arbitrarily as required.
本实施例中的钢轨电位抑制方法，包括以下步骤：The rail potential suppressing method in the present embodiment comprises the following steps:
步骤S10、将可调电阻单元的阻值调至最大；Step S10, adjusting the resistance value of the adjustable resistance unit to the maximum;
其中，可调电阻单元连接于钢轨和地网之间，初始状态下，将可调电阻单元的电阻值调至最大，可以在电路导通后有效保护电路，在本实施例中，钢轨和地网之间还连接有熔断器，熔断器与可调电阻单元串联，用于保护电路，保护电路电流不超过设计限值，保证电路安全运行。Among them, the adjustable resistance unit is connected between the rail and the ground grid. In the initial state, the resistance value of the adjustable resistance unit is adjusted to the maximum, which can effectively protect the circuit after the circuit is turned on. In this embodiment, the rail and the ground grid A fuse is also connected between the nets, and the fuse is connected in series with the adjustable resistance unit to protect the circuit, and the current of the protection circuit does not exceed the design limit to ensure the safe operation of the circuit.
步骤S21、当钢轨电位为正值，且大于速动电压限值时，将反并联晶闸管模块导通后，将可调电阻单元的阻值调至零，接着，将反并联晶闸管模块断开，并逐渐增加可调电阻单元的阻值，同时，通过电压检测模块实时检测钢轨电位，使钢轨电位等于电压调节限值；Step S21, when the rail potential is positive and greater than the snap voltage limit, turn on the anti-parallel thyristor module, adjust the resistance of the adjustable resistance unit to zero, and then disconnect the anti-parallel thyristor module, And gradually increase the resistance value of the adjustable resistance unit. At the same time, the rail potential is detected in real time through the voltage detection module, so that the rail potential is equal to the voltage adjustment limit;
其中，电压速动限值取标准规定的钢轨电位保护动作的限值90V，电压调节限值可设，例如80V，超过80V时，则调节可调电阻单元，使电压维持在80V。Among them, the limit value of voltage quick action is 90V, the limit value of rail potential protection action stipulated in the standard, and the limit value of voltage adjustment can be set, for example, 80V. When it exceeds 80V, adjust the adjustable resistance unit to maintain the voltage at 80V.
具体的，通过与可调电阻模块并联的电压检测模块检测钢轨电位，当钢轨电位为正值，且大于速动电压限值时，可能发生接触网短路，此时，将反并联晶闸管模块导通即将钢轨与地网短接。Specifically, the rail potential is detected by the voltage detection module connected in parallel with the adjustable resistance module. When the rail potential is positive and greater than the snap voltage limit, a catenary short circuit may occur. At this time, the anti-parallel thyristor module is turned on The steel rail and the ground grid are short-circuited.
步骤S22、当钢轨电位为正值，且大于电压调节限值并小于等于速动电压限值时，调低可调电阻单元的阻值，使钢轨电位等于电压调节限值。Step S22. When the rail potential is positive and greater than the voltage adjustment limit and less than or equal to the snap voltage limit, lower the resistance of the adjustable resistance unit so that the rail potential is equal to the voltage adjustment limit.
具体的，当电压检测模块检测到钢轨电位为正值时，检测位置钢轨会向大地泄漏电流，该位置不需要进行排流。当钢轨电位为正值，且大于电压调节限值并小于等于速动电压限值时，此时，钢轨电位已经超过人身安全电压限值。应减小可调电阻单元的阻值，以使钢轨电位降低。Specifically, when the voltage detection module detects that the potential of the rail is positive, the rail at the detection position will leak current to the ground, and current drainage is not required at this position. When the rail potential is positive and greater than the voltage regulation limit and less than or equal to the snap voltage limit, the rail potential has exceeded the personal safety voltage limit. The resistance value of the adjustable resistance unit should be reduced to reduce the rail potential.
步骤S23、当钢轨电位为负值，且大于负向速动电压限值时，将反并联晶闸管模块导通后，将可调电阻单元的阻值调至零，接着，将反并联晶闸管模块断开，并调节可调电阻单元的阻值使排流电流值等于杂散电流值；Step S23, when the rail potential is negative and greater than the negative snap voltage limit, turn on the anti-parallel thyristor module, adjust the resistance of the adjustable resistance unit to zero, and then turn off the anti-parallel thyristor module Open, and adjust the resistance value of the adjustable resistance unit to make the discharge current value equal to the stray current value;
步骤S24、当钢轨电位为负值，且大于负向电压调节限值并小于等于负向速动电压限值时，调节可调电阻单元的阻值使排流电流值等于杂散电流值。Step S24 , when the rail potential is negative and greater than the negative voltage adjustment limit and less than or equal to the negative snap voltage limit, adjust the resistance of the adjustable resistance unit to make the drain current equal to the stray current.
优选的，该方法还包括以下步骤：Preferably, the method also includes the following steps:
当钢轨电位为正值，且小于电压调节限值时，将可调电阻单元的阻值保持在最大状态。When the rail potential is positive and less than the voltage regulation limit, the resistance value of the adjustable resistance unit is kept at the maximum state.
具体的，当钢轨电位为正值，且小于电压调节限值时，钢轨电位低于人身安全电压限值，可调电阻单元电阻调节至最大，以减少该位置电流的泄漏量。Specifically, when the rail potential is positive and less than the voltage adjustment limit, the rail potential is lower than the personal safety voltage limit, and the resistance of the adjustable resistance unit is adjusted to the maximum to reduce the current leakage at this position.
本发明的有益效果：Beneficial effects of the present invention:
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 rail potential suppression system and method of the present invention can suppress the rail potential and stray current at the same time, and can avoid the problems of excessive stray current leakage when the rail potential is independently controlled, and the serious rise of the rail potential when the stray current is independently controlled, effectively Reduce the hazards of rail potential to personal safety, reduce the corrosion hazards of stray currents to subway structural steel bars and surrounding buried pipelines, and can reduce equipment costs, reduce space occupation, and improve control effects.
以上实施例仅是为充分说明本发明而所举的较佳的实施例，本发明的保护范围不限于此。本技术领域的技术人员在本发明基础上所作的等同替代或变换，均在本发明的保护范围之内。本发明的保护范围以权利要求书为准。The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention shall be determined by the claims.
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