CN205003207U - Subway stray current collector - Google Patents
Subway stray current collector Download PDFInfo
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- CN205003207U CN205003207U CN201520643716.3U CN201520643716U CN205003207U CN 205003207 U CN205003207 U CN 205003207U CN 201520643716 U CN201520643716 U CN 201520643716U CN 205003207 U CN205003207 U CN 205003207U
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Abstract
The utility model discloses a subway stray current collector belongs to subway stray current monitoring technology field. This subway stray current collector includes data acquisition device, reference electrode, measurement terminal, and the data acquisition device sets up the other measurement terminal department in underground railway track, the data acquisition device includes CPU, the last power source of being equipped with of CPU, sets up signal interface, AD conversion interface, communication interface, and each interface is used for inserting relevant equipment respectively. Because the data acquisition device sets up the other measurement terminal department in underground railway track, effectively avoids loss and interference among the signal transmission process for measurement accuracy reaches 2 per mill under normal atmospheric temperature, the very warm purgation between - 40 DEG C -70 DEG C reaches 5 per mill.
Description
Technical field
The utility model relates to Metro Stray Current Monitoring technical field, particularly relates to a kind of metro stray current collector.
Background technology
Subway is the quick large conveying quantity urban track traffic pattern progressively developing a kind of electric propulsion of formation along the form of ground rail system, its circuit is laid in subterranean tunnel usually, have beyond down town, forward system of laying ground or overpass to from underground.
Except above-mentioned subway, also comprise the railway that overhead railway (Elevatedrailway) or road surface are laid.Therefore, subway is that right of way is proprietary, and without usual friendship, this is also the mark that subway is different from the essence of Light Rail Transit.
At present, urban track traffic adopts direct-current traction power supply, and power primarily of built on stilts positive contact net, reflux using rail as negative pole conductor.Therefore the electric current refluxed in track flows to electronegative potential by noble potential, namely from vehicle, the negative pole of traction substation is got back to by wheel, track, vehicle place place is noble potential, and traction substation is electronegative potential, and track has certain transition resistance over the ground, like this because potential difference (PD) and transition resistance exist, just form leakage current over the ground, some back flow currents spill from rail and get back to traction substation or other electronegative potentials by the metallic conduit etc. be embedded near track, so just form current return.Electric current is cathodic area from the place that soil flows into rail or underground pipe with negative charge, and the metallic conduit in cathodic area is generally unaffected; Electric current flows out from rail or pipeline corrosion protection insulation course breakage, and pipeline positively charged herein, is anodic site, dissolves in the electrolyte of surrounding with ferric ion form, thus make the Metal pipeline corrosion of anodic site.The reinforcing bar, the metal object that are directly embedded in underground are more easily corroded.Usually the electric current that this part is leaked to the earth from rail is referred to as stray current.
In the transportation system such as subway, light rail of direct current supply, monitoring of stray current has caused the attention of domestic and international research and production unit.This electric current produces serious electrolytic corrosion effect by subway hole body bar construction, buried metal component and pipeline facility etc., jeopardizes the safety of Architectural Equipment, and can lead to catastrophic consequence.Therefore, stray current monitored and take effective safeguard procedures to be subway construction and indispensable part in operation.
In order to detect the stray current in the transportation system such as subway, light rail:
Authorization Notice No. is that the Chinese utility model of CN203479893U discloses a kind of sensor being applicable to Metro Stray Current Monitoring, relates to Metro Stray Current Monitoring technical field.See accompanying drawing 1, the A/D change-over circuit that this sensor has an amplification filtering multi-channel conversion circuit, is connected with amplification filtering multi-channel conversion circuit, the microcontroller be connected with A/D change-over circuit, the GPRS module be connected with microcontroller respectively, ethernet interface circuit, alarm indication circuit, memory circuit and power circuit.Advantage is: degree of accuracy is high, and working stability is reliable, and antijamming capability is strong, economical and practical.
This sensor being applicable to metro stray current detection mainly completes the perception of bottom stray current corrosion parameter, sample to signal respectively in interval at regular intervals, and signal is sent into microcontroller after amplification filtering and AD conversion processing, after microcontroller processes stray current coherent signal further, the digital signal being converted to certain coding carries out Internet Transmission by Ethernet or GPRS, completes the remote online monitoring of stray current.But whether it does not relate to sensor can carry out in-site collecting to signal, cannot know whether it can avoid loss in signals transmission and interference effectively.
Application publication number is that the Chinese invention patent of CN103260263A discloses a kind of metro stray current wireless monitor system and method.See accompanying drawing 2, system comprises Surveillance center, for carrying out the monitoring of state and parameter to each Metro Stray Current Monitoring point; ZigBee wireless network, comprise 1 ZigBee telegon and n ZigBee router, ZigBee telegon is connected with the communication of n ZigBee router, and each ZigBee router is for monitoring a Metro Stray Current Monitoring point; And n intelligent sensor, each intelligent sensor is for gathering the data of a Metro Stray Current Monitoring point; Surveillance center is connected with the communication of ZigBee telegon, n ZigBee router respectively with n the corresponding connection of intelligent sensor.This metro stray current wireless monitor system adopts ZigBee radio network technique, and achieve the intelligent monitoring of metro stray current, cost is low, easy to use.
What this metro stray current wireless monitor system focused on is how by each metro stray current check point carry out state, parameter how on deliver to Surveillance center, do not relate to sensor and whether can carry out in-site collecting to signal yet, therefore, also cannot know whether it can avoid loss in signals transmission and interference effectively.
Utility model content
In view of this, the utility model provides a kind of mode utilizing in-site collecting signal, effectively avoid the loss in signals transmission and interference, measuring accuracy is made to reach 2 ‰ at normal temperatures, non-normal temperature between-40 DEG C ~ 70 DEG C is issued to the metro stray current collector of 5 ‰, thus is more suitable for practicality.
In order to achieve the above object, the technical scheme of metro stray current collector that provides of the utility model is as follows:
The metro stray current collector that the utility model provides comprises data collector, contrast electrode, measurement terminal,
Described data collector is arranged at the other measurement terminal place of underground railway track;
The drainage net of subway, railway voltage, the contrast electrode of described measurement terminal accesses described data collector.
The metro stray current collector that the utility model provides also can be applied to the following technical measures to achieve further.
As preferably,
Described data collector comprises CPU, and described CPU is provided with power interface, signalization interface, AD conversion interface, communication interface:
Power supply is that described CPU powers by described power interface;
Setting device arranges address, baud rate by described signalization interface;
AD converter converts simulating signal to digital signal by AD conversion interface;
Communication interface is for sending on the metro stray current collected signal;
The drainage net of subway, railway voltage, the contrast electrode of described measurement terminal accesses described AD converter.
As preferably, the parameter of described data collector collection comprises contrast electrode body potential, the real-time current potential that polarizes, rail real-time voltage, rail maximum voltage, average polarization current potential forward migration value, average polarization current potential negative offset value.
As preferably, described power supply is 220VAC power supply.
As preferably, described setting device is toggle switch, or long-range setting operation interface.
As preferably, described remote operator interface is selected from PC or mobile terminal.
As preferably, described communication interface is wired communication interface, or-wireless communication interface.
As preferably, described wired communication interface is selected from the one in RS-232, RS-485, USB, I2C, TWI, SPI, 1WIRE, Ethernet interface;
Described wireless communication interface is selected from the one in Bluetooth technology Wi-Fi, 4G, 3G, GPRS, zigbee.
As preferably, described CPU is also provided with alarming device interface, warning device performs the actuation of an alarm of described contrast electrode damage by described alarming device interface.
As preferably, described warning device be selected from warning light, hummer, note, micro-letter, QQ message, audio alert any one or a few.
The metro stray current collector that the utility model provides comprises data collector, contrast electrode, measurement terminal, and data collector is arranged at the other measurement terminal place of underground railway track; Data collector comprises CPU, and CPU is provided with power interface, signalization interface, AD conversion interface, communication interface, and each interface is respectively in order to access relevant device.Because data collector is arranged at the other measurement terminal place of underground railway track, effectively avoid the loss in signals transmission and interference, measuring accuracy is made to reach 2 ‰ at normal temperatures, non-normal temperature between-40 DEG C ~ 70 DEG C is issued to 5 ‰, for drainage control and systematic analysis provide data supporting.
Accompanying drawing explanation
By reading hereafter detailed description of the preferred embodiment, various other advantage and benefit will become cheer and bright for those of ordinary skill in the art.Accompanying drawing only for illustrating the object of preferred implementation, and is not thought restriction of the present utility model.And in whole accompanying drawing, represent identical parts by identical reference symbol.In the accompanying drawings:
The Chinese utility model of Fig. 1 to be Authorization Notice No. be CN203479893U discloses a kind of architecture logic block diagram being applicable to the sensor of Metro Stray Current Monitoring;
The Chinese invention patent of Fig. 2 to be application publication number be CN103260263A discloses a kind of architecture logic block diagram of metro stray current wireless monitor system;
The using state structural representation of the metro stray current collector that Fig. 3 provides for the utility model embodiment one;
The architecture logic schematic diagram of the data collector applied in the metro stray current collector that Fig. 4 provides for the utility model embodiment one;
The architecture logic schematic diagram of the data collector applied in the metro stray current collector that Fig. 5 provides for the utility model embodiment two;
The architecture logic schematic diagram of the data collector applied in the metro stray current collector that Fig. 6 provides for the utility model embodiment three.
Embodiment
Whether the technical scheme of the utility model embodiment can carry out in-site collecting to signal for not relating to sensor in solution prior art, its technical matters whether effectively can avoiding loss in signals transmission and interference cannot be known, provide a kind of mode utilizing in-site collecting signal, effectively avoid the loss in signals transmission and interference, measuring accuracy is made to reach 2 ‰ at normal temperatures, non-normal temperature between-40 DEG C ~ 70 DEG C is issued to the metro stray current collector of 5 ‰, thus is more suitable for practicality.
For further setting forth the utility model for the technological means reaching predetermined utility model object and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to according to the embodiment of the metro stray current collector that the utility model proposes, structure, feature and effect thereof, be described in detail as follows.In the following description, the not necessarily same embodiment that different " embodiment " or " embodiment " refers to.In addition, special characteristic, structure or feature in one or more embodiment can be combined by any suitable form.
Term "and/or" herein, being only a kind of incidence relation describing affiliated partner, can there are three kinds of relations in expression, such as, A and/or B, concrete is interpreted as: can include A and B simultaneously, can individualism A, also can individualism B, above-mentioned three kinds of any one situations can be possessed.
Embodiment one
See accompanying drawing 3 and accompanying drawing 4, the metro stray current collector that the utility model embodiment one provides comprises data collector, contrast electrode 2, measurement terminal 6, and in fig. 3, label 5 represents buried metal works.
Data collector is arranged at other measurement terminal 6 place of underground railway track 1;
Data collector comprises CPU, and CPU is provided with power interface, signalization interface, AD conversion interface, communication interface:
Power supply is that CPU powers by power interface;
Setting device arranges address, baud rate by signalization interface;
AD converter converts simulating signal to digital signal by AD conversion interface;
Communication interface is for sending on the metro stray current collected signal;
The drainage net of subway, railway voltage, the contrast electrode access AD converter of measurement terminal.
The metro stray current collector that the utility model provides comprises data collector, contrast electrode, measurement terminal, and data collector is arranged at the other measurement terminal place of underground railway track; Data collector comprises CPU, and CPU is provided with power interface, signalization interface, AD conversion interface, communication interface, and each interface is respectively in order to access relevant device.Because data collector is arranged at the other measurement terminal place of underground railway track, effectively avoid the loss in signals transmission and interference, measuring accuracy is made to reach 2 ‰ at normal temperatures, non-normal temperature between-40 DEG C ~ 70 DEG C is issued to 5 ‰, for drainage control and systematic analysis provide data supporting.
Wherein, contrast electrode as far as possible near drainage net, contrast electrode the closer to drainage net, the loss in signals transmission and interference less, measuring accuracy is higher.
Wherein, the parameter of data collector collection comprise contrast electrode body potential, the real-time current potential that polarizes, rail real-time voltage, rail maximum voltage, average polarization current potential forward migration value, average polarization current potential negative offset value.
Wherein, power supply is 220VAC power supply, 220VAC power supply is the general power supply of registering one's residence that provides of life electrical network, in this case, this data collector directly can be utilized power lead to insert conventional electrical socket, or, insert conventional electrical socket, without the need to special independent power supply by commercially available wiring board.
In the present embodiment, setting device is toggle switch, and toggle switch (is also DIP switch, toggle switch, overclocking switch, address switch, moves with the hand switch, digital switch, thumb-acting switch) be that a being used for operates the address switch controlled, employing be 0/1 binary coding principle.Toggle switch is chosen from Taiwan hundred jade-like stone, and circle reaches, KE etc.The configuration of toggle switch be selected from half spacing type (its pin apart from the half being normal toggle switch, namely Pitch1.27mm.Principal feature volume is little, accounts for less space in the circuit board), (pin, apart from for 2.54mm, adopts top to dial direct insertion (DIP), flat pattern, belongs to binary states DIP flat pattern.The dynamics of topworks is maximum to 800gF in each series, and shell, topworks all adopt PBT, UL94V-0 material.Contact and end points are all gold-plated, and reliability is strong.Working temperature is at-40 DEG C ~ 85 DEG C), DIP sliding-type (pin spacing Pitch2.54mm, sliding dip switches, belong to binary states.Compared with KG series, the dynamics of its topworks only has its half.Topworks is 4/6Nylon, UL94V-0, White; Outer cover material is PPS, UL94V-0, Black. is gold plated contact equally, and working temperature is at-40 DEG C ~ 85 DEG C), DIP key type (pin spacing Pitch2.54mm, top dial direct insertion (DIP), binary states, key type.The projection of topworks is only 0.9mm.Gold clad contact, reliability is strong.Actuator is only 0.9mm, and topworks and outer cover material are Nylon, and working temperature is at-40 DEG C ~ 85 DEG C), the ultra-thin sliding-type of DIP (pin spacing Pitch2.54mm, top dial direct insertion (DIP), binary states, sliding-type.Gold clad contact, reliability is strong.Topworks and outer cover material are 6TNylon, UL94V-0.Thickness ultrathin is 3.7mm only, and topworks's thickness is also only 0.6mm), DIP key convex (pin spacing Pitch2.54mm, top dial direct insertion (DIP), binary states, key type.Contact portions is gold clad contact, is constructed, ensure that high reliability by the automatically cleaning of action.Topworks material 4/6Nylon, UL94V-0 are convex.Outer cover material PPS, UL94V-0.Its width and thickness are respectively 10.7mm, 9.5mm).
Adopt the shortcoming of toggle switch to be, needing operating personnel must arrive toggle switch place and arrange, is a kind of waste to human resources.
In the present embodiment, communication interface is wired communication interface, or, wireless communication interface.
Wherein, wired communication interface is selected from the one in RS-232, RS-485, USB, I2C, TWI, SPI, 1WIRE, Ethernet interface.Wire communication, owing to being subject to the restriction of signal line, be not very flexible, but cost is lower in application process.
Wireless communication interface is selected from Bluetooth technology, Wi-Fi, 4G, the one in 3G, GPRS, zigbee.The impact that radio communication is subject to signal line is less, but all need specific wireless signal transmission and receiving trap, cost is higher.
In practice, according to actual conditions needs, can select flexibly, adopt the scheme that cost performance is higher.
The principle of work of the metro stray current collector that the utility model embodiment one provides is as follows:
Contrast electrode imbeds underground near drainage net, as reference potential.Contrast electrode, drainage net and track access collector by connection terminal.
The not stray current when night does not have train operation, thus can using drainage net as the earth 4, now the voltage of drainage net and contrast electrode is the body potential V1 (label is 2) of contrast electrode.When night does not have train operation, monitoring device sends and calculates contrast electrode body potential V1 (label is 2) order.After data collector receives orders, calculate body potential V1 (label is 2) mean value half an hour of contrast electrode, and this value is prepared against use stored in Flash.The contrast electrode body potential V1 (label is 2) obtained, it can be used for polarized potential V2 (label is 3) and calculates.
When train normally runs, according to measuring the voltage V and the contrast electrode body potential V1 (label is 2) that obtain contrast electrode and drainage net, polarized potential V2 (label the is 3)=V1-V of drainage net can be obtained.Take half an hour as length of window, moving window in units of a minute, the polarized potential mean value in real-time calculation window.And add up maximum railway voltage on the same day.
In the present embodiment, data collector is by RS485 and monitoring device communication, and adopt ModBus stipulations, by the instantaneous value of polarized potential, railway voltage instantaneous value, body potential, polarized potential mean value, maximum railway voltage value sends monitoring device to.
Embodiment two
The difference of the metro stray current collector provided with the utility model embodiment one is, in the metro stray current collector that the utility model embodiment two provides, arrange address, baud rate operation by long-range setting operation interface.In this case, operating personnel, without the need to arranging to toggle switch place, can save human resources, and easy to operate.
Wherein, remote operator interface is selected from PC or mobile terminal.When remote operator interface is PC, need staff just can carry out associative operation to working site.And when if remote operator interface is mobile terminal, even if operating personnel are in or travel outside, also can complete the utility model embodiment two is provided the address of metro stray current collector, the setting of baud rate.Make application more convenient.In this case, need the data emission port that address, baud rate are set on PC or mobile terminal simultaneously, and the metro stray current collector provided in the utility model embodiment two is provided with the data receiver port of address, baud rate.
Embodiment three
The basis of the utility model embodiment one or embodiment two is improved, the CPU of the metro stray current collector that the utility model embodiment three provides also is provided with alarming device interface, and warning device performs the actuation of an alarm of contrast electrode damage by alarming device interface.Also can judge whether contrast electrode damages according to contrast electrode body potential V1 (label is 2), send if damage and damage remote signalling alarm.
Wherein, warning device is any one or a few in warning light, hummer, note, micro-letter, QQ message, audio alert.
Wherein, when warning device is warning light, under normal circumstances, alerting signal etc. are gone out, once there is the situation that contrast electrode damages, warning light is bright, adopts and shows in this way, and technical scheme is simple, be easy to realize, and cost are low.In the present embodiment, send red light when alerting signal etc. are bright, because the wavelength of redness is longer, when distant, staff also can observe the alerting signal of warning light.In addition, warning light can also be set to two chrominance signals etc., such as, under normal circumstances, green alerting signal etc. are bright, once there is the situation that contrast electrode damages, red eye is bright.
Wherein, when warning device is hummer, keep a close watch on warning light without the need to operating personnel always, once contrast electrode damages, hummer can be sounded and be pointed out, thus can alleviate the work load of operating personnel, even if operating personnel are in dream, when hummer sounds, according to the sound of hummer, staff also can learn that contrast electrode damages, thus convenient operation personnel change the contrast electrode damaged in time.
Wherein, when warning device is any one or a few in note, micro-letter, QQ message, audio alert, staff only can learn according to handheld terminal the message that contrast electrode damages.Without the need to staff to working site, even or travel outside, also the message that contrast electrode damages can be learnt easily at home, and then, can notify that related personnel changes in time to the contrast electrode damaged.
Although described preferred embodiment of the present utility model, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the utility model scope.
Above, it is only preferred embodiment of the present utility model, not do any pro forma restriction to the utility model, any simple modification done above embodiment according to technical spirit of the present utility model, equivalent variations and modification, all still belong in the scope of technical solutions of the utility model.
Claims (10)
1. a metro stray current collector, is characterized in that, comprises data collector, contrast electrode, measurement terminal,
Described data collector is arranged at the other measurement terminal place of underground railway track;
The drainage net of subway, railway voltage, the contrast electrode of described measurement terminal accesses described data collector.
2. metro stray current collector according to claim 1, is characterized in that, described data collector comprises CPU, and described CPU is provided with power interface, signalization interface, AD conversion interface, communication interface:
Power supply is that described CPU powers by described power interface;
Setting device arranges address, baud rate by described signalization interface;
AD converter converts simulating signal to digital signal by AD conversion interface;
Communication interface is for sending on the metro stray current collected signal;
The drainage net of subway, railway voltage, the contrast electrode of described measurement terminal accesses described AD converter.
3. metro stray current collector according to claim 2, it is characterized in that, the parameter of described data collector collection comprises contrast electrode body potential, the real-time current potential that polarizes, rail real-time voltage, rail maximum voltage, average polarization current potential forward migration value, average polarization current potential negative offset value.
4. metro stray current collector according to claim 2, is characterized in that, described power supply is 220VAC power supply.
5. metro stray current collector according to claim 2, is characterized in that, described setting device is toggle switch, or long-range setting operation interface.
6. metro stray current collector according to claim 5, is characterized in that, described remote operator interface is selected from PC or mobile terminal.
7. metro stray current collector according to claim 2, is characterized in that, described communication interface is wired communication interface, or wireless communication interface.
8. metro stray current collector according to claim 7, is characterized in that, described wired communication interface is selected from the one in RS-232, RS-485, USB, I2C, TWI, SPI, 1WIRE, Ethernet interface;
Described wireless communication interface is selected from the one in Bluetooth technology, Wi-Fi, 4G, 3G, GPRS, zigbee.
9. metro stray current collector according to claim 2, is characterized in that, described CPU is also provided with alarming device interface, and warning device performs the actuation of an alarm of described contrast electrode damage by described alarming device interface.
10. metro stray current collector according to claim 9, is characterized in that, described warning device be selected from warning light, hummer, note, micro-letter, QQ message, audio alert any one or a few.
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| CN201520643716.3U CN205003207U (en) | 2015-08-24 | 2015-08-24 | Subway stray current collector |
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| CN201520643716.3U CN205003207U (en) | 2015-08-24 | 2015-08-24 | Subway stray current collector |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842528A (en) * | 2016-05-23 | 2016-08-10 | 南京大全自动化科技有限公司 | Collection device for subway stray current |
| CN106124828A (en) * | 2016-06-28 | 2016-11-16 | 中国船舶重工集团公司第七二五研究所 | A kind of novel seawaterline stray current detecting device |
| CN106383261A (en) * | 2016-11-15 | 2017-02-08 | 深圳科安达电子科技股份有限公司 | Stray current intelligent sensor |
| CN106569017A (en) * | 2016-11-15 | 2017-04-19 | 深圳市科安达轨道交通技术有限公司 | Rail transit stray current detection method and detection system |
| CN109142908A (en) * | 2018-06-29 | 2019-01-04 | 中电普瑞电力工程有限公司 | A kind of calculation method and system that stray electrical current influences substation grounding point current potential |
| CN109387680A (en) * | 2018-10-15 | 2019-02-26 | 国网四川省电力公司电力科学研究院 | Urban rail tractive power supply system and urban electric power main transformer D.C. magnetic biasing synchronous monitoring system |
| WO2020103394A1 (en) * | 2018-11-19 | 2020-05-28 | 中国矿业大学 | Method for monitoring location of insulation damage of subway/coal-mine return track and transition resistance thereof |
| CN114624532A (en) * | 2022-03-14 | 2022-06-14 | 华东交通大学 | Stray current corrosion resistant power grid detection device |
| CN114778984A (en) * | 2022-04-28 | 2022-07-22 | 西南交通大学 | Method for detecting stray current of transformer substation based on earth surface potential change |
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- 2015-08-24 CN CN201520643716.3U patent/CN205003207U/en active Active
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105842528A (en) * | 2016-05-23 | 2016-08-10 | 南京大全自动化科技有限公司 | Collection device for subway stray current |
| CN106124828A (en) * | 2016-06-28 | 2016-11-16 | 中国船舶重工集团公司第七二五研究所 | A kind of novel seawaterline stray current detecting device |
| CN106569017B (en) * | 2016-11-15 | 2019-03-05 | 深圳市科安达轨道交通技术有限公司 | A kind of rail traffic stray electrical current detection method and detection system |
| CN106569017A (en) * | 2016-11-15 | 2017-04-19 | 深圳市科安达轨道交通技术有限公司 | Rail transit stray current detection method and detection system |
| CN106383261A (en) * | 2016-11-15 | 2017-02-08 | 深圳科安达电子科技股份有限公司 | Stray current intelligent sensor |
| CN106383261B (en) * | 2016-11-15 | 2023-06-13 | 深圳科安达电子科技股份有限公司 | Stray current intelligent sensor |
| CN109142908A (en) * | 2018-06-29 | 2019-01-04 | 中电普瑞电力工程有限公司 | A kind of calculation method and system that stray electrical current influences substation grounding point current potential |
| CN109142908B (en) * | 2018-06-29 | 2023-07-18 | 中电普瑞电力工程有限公司 | Calculation method and system for influence of stray current on grounding point potential of transformer substation |
| CN109387680A (en) * | 2018-10-15 | 2019-02-26 | 国网四川省电力公司电力科学研究院 | Urban rail tractive power supply system and urban electric power main transformer D.C. magnetic biasing synchronous monitoring system |
| CN109387680B (en) * | 2018-10-15 | 2020-12-08 | 国网四川省电力公司电力科学研究院 | Urban rail traction power supply system and urban electric power main transformer direct-current magnetic bias synchronous monitoring system |
| WO2020103394A1 (en) * | 2018-11-19 | 2020-05-28 | 中国矿业大学 | Method for monitoring location of insulation damage of subway/coal-mine return track and transition resistance thereof |
| US10962605B2 (en) * | 2018-11-19 | 2021-03-30 | China University Of Mining And Technology | Method for detecting insulation damage location in reflux rail of subway/coal mine and transition resistance thereof |
| CN114624532A (en) * | 2022-03-14 | 2022-06-14 | 华东交通大学 | Stray current corrosion resistant power grid detection device |
| CN114778984A (en) * | 2022-04-28 | 2022-07-22 | 西南交通大学 | Method for detecting stray current of transformer substation based on earth surface potential change |
| CN114778984B (en) * | 2022-04-28 | 2023-05-30 | 西南交通大学 | Transformer substation stray current detection method based on earth surface potential change |
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