CN101226682B - Device for monitoring stray current of novel subway - Google Patents
Device for monitoring stray current of novel subway Download PDFInfo
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- CN101226682B CN101226682B CN2007100366569A CN200710036656A CN101226682B CN 101226682 B CN101226682 B CN 101226682B CN 2007100366569 A CN2007100366569 A CN 2007100366569A CN 200710036656 A CN200710036656 A CN 200710036656A CN 101226682 B CN101226682 B CN 101226682B
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Abstract
Novel subway stray current automatic monitoring system comprises that a plurality of stray current online automatic monitoring devices which are utilized as local monitoring slave machines are connected with a remote monitoring main machine. A switch power module, a data collecting module, an Ethernet communication module, an auxiliary hardware module and a man-machine interactive module are arranged on the same PCB printing circuit board around the processor of the system. The switch power module is internally-equipped with an EMC filter with high-performance. A/D transformation circuit employs bipolar and 12 bit A/D transducer MAX197 which is internally equipped with 8 ways sample-taking passages. The auxiliary hardware module comprises an EEPROM secondary permanent storage module, a hardware watchdog circuit, a self-contained battery calendar clock module and a serial port communication interface circuit. The invention simplifies the structure of the system, enables data sharing, information fusion and synergic observation among slave machines, which greatly strengthens the accuracy and tightness of the monitoring of the stray current, additionally, the cost of the monitoring device is reduced.
Description
Technical field
The invention belongs to the electrical measurement field, relate to a kind of city rail monitoring of stray current device, is the device that can realize that stray current changes in the online auto monitoring subway system specifically.
Background technology
The stray current of subway system is difficult to direct measurement, the general corrosion situation that adopts the way of measuring indirectly to reflect stray current.Subway system structural steel and hardware are subjected to the dangerous index of stray current corrosion, are that electrolytical current density and the potential polarization skew that causes thus come definite around being flowed to by structural steel surface.And current density is difficult to direct measurement, has only by measuring potential polarization to be offset and to judge.Simultaneously, metro stray current has certain periodicity and randomness, and not being all has the stray current galvanic corrosion to take place all the time, has only when train stray current just might occur during through the more weak highway section of insulating property to leak the corrosion situation.The monitoring of stray current method is divided manual measurement and online auto monitoring two classes.The manual measurement method can't accurately and timely collect real stray current, and real-time is relatively poor, the progressive process of the discontinuity of subway train operation and electrochemical metal corrosion in addition, and the data of acquisition can not truly reflect the situation of change and the extent of corrosion of stray current.The online auto monitoring aspect has been carried out more research both at home and abroad, at present like product function singleness, construction system complexity, application cost height; On communication mode is handled, adopted traditional master-slave mode, that is be the center with the host computer, acquisition is issued to monitoring device, the uniform data that collects is uploaded to distant place background computer handle.The drawback of this communication mode maximum is that each communication all will be initiated by upper calculating, and the data in the monitoring device can not active upload be given host computer, and Fault Tolerance is poor, and real-time is relatively poor.
Summary of the invention
The object of the present invention is to provide a kind of intelligent online automated watch-keeping facility, this device can not only self-adaptation be adjusted data acquiring frequency, but also can carry out the online uninterrupted monitoring of stray current galvanic corrosion at special buried metal body.And change the catechetical communication pattern of principal and subordinate into pattern that two-way equity is initiated communication, and promoted the transfer rate of data, optimized data acquisition modes, overcome the deficiency on terrain iron stray current on-Line Monitor Device communication mode and the function.
It is as described below that the present invention solves the scheme that its technical matters adopts: stray current online auto monitoring device is monitored slave as this locality, with a remote monitoring main frame and metro stray current automatic monitoring system of a plurality of local monitoring slave machines.Each local monitoring slave all has unique logical address (being made up of four tens digits), distinguishes each different slave device with this.The logical address of slave not only can be imported by its keyboard, also can set by the remote monitoring main frame.No matter be to revise or distant place renewal by this locality, the slave logical address of new input all can be broadcasted on whole network, checks whether this logical address is occupied.If an illegal logical address, then system can point out and re-enter new logical address; If continuous three illegal logical addresses of input, then system can provide an effective logical address for operating personnel's reference.Constitute a monitoring network by Industrial Ethernet between remote monitoring main frame and the monitoring device slave.
It is the embedded system of processor with the LPC2292 of PHILIPS company microcontroller that stray current online auto monitoring device is one.LPC2292 is based on 16/32 ARM7TDMI-S that supports real-time simulation and embedded tracking
TMThe microcontroller of CPU.
Microcontroller LPC2292 mainly is responsible for tasks such as data sampling, data analysis, ethernet communication and man-machine interface interaction process.In order to finish above-mentioned functions, around the LPC2292 chip, also have other important hardware to form module: switch power module, data acquisition module, ethernet communication module, ancillary hardware module and human-computer interaction module.Preceding four of this five big hardware module are distributed on the same PCB (Printed CircuitBoard, printed circuit board (PCB)), and this is the essential hardware components of each stray current online auto monitoring device, is called data acquisition board; Last is a human-computer interaction module, and it mainly is made up of small LCD LCD, small-sized quadruple linkage keyboard and various pilot lamp.These man-machine interaction hardware are distributed in separately on the small-sized PCB printed circuit board (PCB), are called the man-machine interaction plate.
Little, the light weight of man-machine interaction plate bulk is convenient to operating personnel and is carried.All data acquisition board can the mutual plate of a shared personal-machine, and this not only greatly reduces cost, but also makes whole monitoring device have modular construction, is convenient to from now on plant maintenance and upgrading.When operating personnel need running status on the data query collection plate and monitoring of stray current information or needs to revise the controlled variable of data acquisition board, man-machine interaction plate and data acquisition board can be coupled together by the parallel port data line.With respect to data acquisition board, the man-machine interaction plate has the function of plug and play, and its needed working power is provided by data acquisition board.Data acquisition board has judged whether that by a pair of node the man-machine interaction plate is attached thereto.After both linked to each other by the parallel port data line, this was in closure state to node, otherwise is in off-state.Under off-state, data acquisition board detects this a pair of node with the frequency of 2Hz, when double detected result is a closure state, then judging has the man-machine interaction plate to be attached thereto this moment, closing relay is given the power supply of man-machine interaction plate immediately, activate LCD driver and keyboard scan program behind the time-delay 100ms, liquid crystal display " is welcome to use " page and is switched to " monitoring of stray current " main interface.For the man-machine interaction plate is easy to carry, selected the LCDs of 128 * 64 dot matrix for use.Input keyboard has four keys: increase key (preceding line unit), reduce key (back spacer), acknowledgement key, cancel key.These four menu modes that the button matching design is good have satisfied the requirement of whole device well.
Switch power module on the data acquisition board mainly is responsible for converting the direct supply of each electric pressure along the 220V AC power that the subway rail provides to.At first utilize Switching Power Supply the alternating current of 220V is transformed into+5V ,+12V and-the stable DC voltage of this Three Estate of 12V.May produce power supply when moving in view of subway and disturb, Switching Power Supply has built-in high-performance EMC wave filter.
Microcontroller LPC2292 needs dual power supply: 1.8V ± 0.15V, 3.3V ± 10%.So select for use SPX1117M3-1.8 and two low pressure reduction integrated package of pressure-stabilizing general+5V DC voltage of SPX1117M3-3.3 to be transformed to 1.8V and 3.3V respectively, be the LPC2292 power supply.
Data acquisition module is one of module important on the data acquisition board, and it is made up of analog signal conditioner circuit, A/D change-over circuit two large divisions.The analog signal conditioner circuit mainly is made of operational amplifier LM224,10V voltage stabilizing diode and a series of precision resister.Data acquisition board needs sampling four tunnel analog quantitys altogether: (1) contrast electrode intrinsic current potential; (2) buried metal mws polarization current potential; (3) current drainage net above earth potential; (4) rail above earth potential.The amplitude range of these four physical quantitys differs bigger, and wherein contrast electrode intrinsic current potential generally has only a millivolt order of magnitude, and under normal temperature environment, the intrinsic current potential of copper/saturated copper sulphate contrast electrode is about 300mV.Therefore when the contrast electrode intrinsic current potential of measuring gained surpassed 500mV, monitoring device sent the contrast electrode fail message.The accumulative process when galvanic corrosion of buried metal structure is a length, its polarized potential generally can not surpass ± 2V.The above earth potential of current drainage net has reflected the stray current size that the current drainage net is collected indirectly, utilizes this information can control the open and close of intelligent current drainage cabinet.The leakage of stray current is subjected to the influence of rail above earth potential very big, abnormal voltage (touch voltage) appears between rail and platform because this above earth potential can cause, jeopardize passenger and staff's safety, device provides warning message when the potential difference (PD) between rail and structural steel surpasses 92V.
For guaranteeing measuring accuracy, the A/D change-over circuit adopts ambipolar 12 A/D converter MAX197, and its signal input range can reach-10V ~ 10V, and only be 6us average switching time, the variation tendency of monitor signal in the time of can fully capturing the subway train operation.Built-in 8 road sampling channels of MAX197, therefore above-mentioned four tunnel analog quantitys can be sampled conversion simultaneously, have accelerated picking rate.
What the ethernet communication module was responsible for communication interconnect between the local monitoring slave and local slave and distant place main frame communicates to connect the ICP/IP protocol of communication protocol employing main flow.The embedded ethernet control chip adopt RTL8019AS, RTL8019AS be a kind of height of producing of Realtek company integrated, support the Ethernet controller of IEEE802.3 standard comprehensively.Satisfy between the slave computer of subway automatic monitoring system fully and the required communication rate between slave computer and the host computer.Any playscript with stage directions ground monitoring slave that is in the LAN (Local Area Network) can initiatively initiate once to communicate by letter when network is idle, has avoided the drawback of " all communications are all initiated by the remote monitoring main frame " control model.
Ancillary hardware module on the data acquisition board comprises EEPROM secondary permanent memory module, hardware watchdog circuit, self-contained battery calendar clock module and serial communication interface circuit etc.Data acquisition board needs constantly to monitor subway rail voltage-to-ground in the ordinary course of things, at train during through local slave loca, the sampling rate of data sampling plate can reach 100Hz, and have a large amount of sampled datas and need obtain temporary cache or forever deposit this moment.The setting value of control model and controlled variable also needs permanent storage in addition.Therefore the LPC2292 chip has been expanded outward and has been had standard I
2The CAT24WC02 chip of C interface is as the outer second-level storage of sheet.Watchdog circuit is the indispensable ingredient of embedded system, and when program was absorbed in endless loop and makes that embedded system enters " deadlock " state, it can send hardware reset signal automatically and force system reset, and program brings into operation from start-up code again.The self-contained battery calendar clock still can operate as normal under system's power-down conditions, and it stamp important " time mark " not only can for each sampled data, but also can excite some special data sampling tasks.For example can only stop to run in subway system and just can carry out in 2 hours, otherwise the sampling accuracy be caused bigger influence because the caused stray electrical of train traction electric current fails to be convened for lack of a quorum for the sampling task of contrast electrode intrinsic current potential.Measuring Time for contrast electrode intrinsic current potential can be set from man-machine interaction plate or distant place main frame, also can use measurement strategies (1:00 AM, 2 points, 3 each continuous sampling 3 times of acquiescence, obtain 9 sampled datas, ask its mean value to be contrast electrode intrinsic current potential).Serial communication interface is to use when leaving portable computer for and being connected with local slave.
Microcontroller LPC2292 has well-to-do relatively ram in slice and Flash resource, and has used pipelining.Consider software development efficiency and LPC2292 chip strong functions, adopted high-level programming language C language to programme.
The whole software system can be called front/rear system or hypercycle system.Application program is an infinite loop, calls respective function in the circulation and finishes corresponding operation, and this part is called as the backstage behavior.Zone bits such as the continuous cycle detection of system " triggering A/D changes ", " unusual condition occurring ", " ethernet communication processing ", " input of response keyboard ", " refreshing liquid crystal display ", if be set and then call corresponding service module unit, then with the zone bit zero clearing.Interrupt service routine is handled asynchronous event, and this part is counted as the foreground behavior.It is a series of discrete, and the interruption processing module of asynchronous execution is gathered, and comprises that timer internal interrupts, A/D converts interruption, outside real-time clock interrupts, the external input keys dish interrupts, ethernet control chip RTL8019AS asks interruption etc.System runs in each module of backstage service routine, all may be hung up by the foreground interruption processing module at any time.In the handling procedure of foreground, carry out turning back to the foreground service module immediately after necessary processing and the set corresponding marker bit.
Similar with hardware configuration, software also is divided into three big modules accordingly:
(1) data acquisition and data analysis module.Data acquisition board has four road input analog amounts, and wherein contrast electrode intrinsic current potential and buried metal mws polarization current potential are a pair of parameters that is used for monitoring buried metal structure electrochemical corrosion rate and galvanic corrosion degree.Current drainage net above earth potential is an important indicator of weighing the stray current size that the current drainage net collects, and it can be used for controlling the conducting and the shutoff of current drainage cabinet.Subway rail above earth potential is the indirect index of rail insulation against ground performance.At the rail longitudinal electrical resistance with under the prerequisite that transition resistance is constant over the ground, the high more stray current that then lets out of rail above earth potential is just big more.And rail above earth potential and this measurement point also have relation with respect to the position of train: when measurement point was positioned at the point midway of train and transformer station, the rail above earth potential was about 0V; When train process measurement point, the rail above earth potential reaches maximal value.Designed the self-adapting data acquisition software according to these rules, when train improves sample frequency when the measurement point, this moment rail above earth potential height, leak into the stray current that the stray current that goes in the earth increases, buried metal structure electrochemical corrosion strength is strengthened, the current drainage net of sampled point below is collected and increase.With respect to other steady moment, the data that obtain this moment are more valuable.When monitoring train through current sampling point, this this locality slave is broadcasted this information and is excited two adjacent slaves to carry out the data sampling task at synchronization on network.The data and the same time that obtain are compared analysis with the historical data under the condition, can learn just whether the interval at these three sampled point places rail decreasing insulating phenomenon occurs, realize localization of fault.
(2) man-machine interaction driver module.Local generally speaking slave does not need human-computer interaction function, and this moment, whether data acquisition board had the man-machine interaction plate coupled with the frequency detecting of 2Hz.If detect, liquid crystal drive program and keyboard scan program are called in then closing relay feeding crystal circuit power supply then.After the data that data acquisition board obtains are handled by analysis, show by LCD.Simultaneity factor parameters setting value is imported by keyboard.Human-computer interaction module is mainly by following function: (a) dynamic refresh shows real-time Monitoring Data, and the physical quantity that needs to show comprises buried metal mws polarization current potential and rail above earth potential.(b) Monitoring Data of non-dynamic refresh demonstration utilizes the form of form to show.Comprise buried metal structure forward polarization average potential and negative sense polarization average electrical place value.(c) query function of characteristic ginseng value, the characteristic ginseng value that can inquire about comprise in the intrinsic current potential of contrast electrode and this period rail maximum potential value over the ground.(d) warning message is recollected function.Local slave not only can provide fault alarm information in real time, but also can recollect the concrete time of classification, parameter value and the warning generation of historical warning message.(e) operating personnel can be provided with the action threshold value of every warning function by keyboard, adjust real-time clock, for every control function of local slave is provided with cryptoguard etc.
(3) network-driven module.The realization and the RTL8019AS hardware drive program that mainly comprise small-sized ICP/IP protocol stack.RTL8019AS supports full duplex, and transmitting-receiving can reach the speed of 10Mbps simultaneously.The SRAM of built-in 16kB is used for the transmitting-receiving buffering, reduces the rate request to primary processor.It also supports 8/16 bit data bus, and 8 interrupt application line and 16 I/O base address selections.RTL8019AS inside can be divided into long-range DMA interface, local DMA interface, MAC (medium access control) logic, digital coding decode logic and other ports.The MAC logic is finished following function: when device when upwards sending data, earlier frame data are delivered to transmission buffer zone among the RTL8019AS by long-range DMA passage, send then and transmit order; Finished the transmission of a frame as RTL8019AS after, begin the transmission of another frame data again.The data that RTL8019AS receives by MAC comparison, CRC check after, deposit send buffer by FIFO; After receiving a full frame, interrupting or the mode of register flag is notified primary processor, fifo logic is made the buffering of 16 bytes to transceive data, to reduce the frequency to local DMA request.
The invention has the beneficial effects as follows: the function that has realized the metro stray current online auto monitoring.Many playscripts with stage directions ground monitoring device slave and remote monitoring main frame can form a metro stray current automatic monitoring system by Industrial Ethernet, have simplified system architecture; Data sharing between the slave, information fusion, synergic monitoring have been strengthened the accuracy and the tightness of monitoring of stray current greatly; Can on-line real time monitoring subway system rail stray current distribution situation along the line; Can analyze the insulating property of rail, orient rail is lower than the safe insulation grade to the earth insulating property section the earth; Can carry out monitoring and prediction at the stray current galvanic corrosion speed and the degree of some buried metal pipeline and structure of the subway steel; The man-machine interaction plate has the function of plug and play, has reduced the cost of monitoring device.
Description of drawings
Fig. 1 low-dropout regulator (direct current 5V converts 3.3V to) synoptic diagram;
Fig. 2 low-dropout regulator (direct current 5V converts 1.8V to) synoptic diagram;
Fig. 3 contrast electrode intrinsic current potential input modulate circuit synoptic diagram;
Fig. 4 buried metal mws polarization current potential input modulate circuit synoptic diagram;
Fig. 5 current drainage net above earth potential input modulate circuit synoptic diagram;
Fig. 6 rail above earth potential input modulate circuit synoptic diagram;
Fig. 7 A/D transducer hardware circuit synoptic diagram;
The outer eeprom memory circuit diagram of Fig. 8 sheet;
Fig. 9 calendar clock peripheral circuit synoptic diagram;
Figure 10 ethernet control chip peripheral circuit synoptic diagram;
The parallel interface synoptic diagram of Figure 11 data acquisition board and man-machine interaction plate;
Figure 12 man-machine interaction plate and the parallel interface synoptic diagram that is connected data acquisition board;
Figure 13 man-machine interaction plate keyboard hardware circuit diagram;
Liquid crystal hardware interface circuit synoptic diagram on Figure 14 man-machine interaction plate;
Figure 15 stray current on-Line Monitor Device software general flow chart synoptic diagram;
Figure 16 metro stray current automatic monitoring system structured flowchart synoptic diagram.
Embodiment
The present invention is further illustrated below in conjunction with the accompanying drawing illustrated embodiment, sees also Fig. 1-16.
Each stray current online auto monitoring device is as slave, forms a distributed subway monitoring stray current system with a remote monitoring main frame.Each monitoring device hardware configuration and software module are in full accord, can exchange use.It is indoor that the remote monitoring main frame is placed in the host computer control of a special use, and monitoring device is then installed along the subway rail.Being configured to of remote monitoring main frame: a) individual PC is one; B) ups power is one; C) laser printer is one; D) metro stray current automatic monitoring system software one cover.
Whole monitoring network system connects a plurality of monitoring devices by TSC Carat5508FC2 Industrial Ethernet switch and a remote monitoring main frame is formed an industrial optical fiber redundant looped network.Ring type structure adopts the fiber medium type, and low-loss characteristic is arranged in transmission, makes that the unrepeatered transmission distance of transmission line is elongated, and the maximum length multimode optical fiber can reach 2km between the adjacent station, and single-mode fiber can reach 40-60km, and maximum covering is enclosed and is 100km.Main machinery control room is connected on the technical grade redundancy loop l network by the monitoring main frame, and controls the information of each website on man-machine interface, also can read the network data of each website simultaneously.Per three adjacent monitoring device slaves constitute a monitoring subnet, are connected on the same TSC Carat5508FC2 Industrial Ethernet switch, and a plurality of Ethernet switches link to each other by single-mode fiber and constitute the industrial optical fiber redundant looped network.
" contrast electrode intrinsic current potential " on each monitoring device and " buried metal mws polarization current potential " input terminal are used for monitoring speed and the degree that the buried metal structure is etched electrochemically.Usually use Cu/CuSO
4As contrast electrode.Under normal temperature environment, the intrinsic current potential of copper/saturated copper sulphate contrast electrode is about 300mV.When the contrast electrode intrinsic current potential of measuring gained surpasses 500mV, think that then this copper sulphate contrast electrode lost efficacy.Generally the copper sulphate contrast electrode is embedded near the monitored buried metal structure.
Note when contrast electrode is buried underground following some: (1) is dissolved in copper sulfate crystal in the distilled water (or fresh water), again with Cu/CuSO earlier
4Contrast electrode is dipped in this solution, soaks 24 hours; (2) the backfill pocket is opened, poured into an amount of fresh water inwards, the uniform mud shape of backfill furnishing; (3) electrode that will soak is embedded in the backfill central authorities that mix up, and backfill will combine closely with electrode, and compacting, and the space can not be arranged; (4) electrode is imbedded burying underground in the hole of digging in advance with the backfill pocket, in the hole, water an amount of fresh water then, so that being electrically connected of electrode and surrounding soil; (5) after electrode is buried underground, lead is inserted the measurement input terminal.
" current drainage net above earth potential " on each monitoring device and " rail above earth potential " input terminal, be used for monitoring current drainage net above earth potential and traveling rail potential to ground situation of change, note during connection that the input cable can not be long, otherwise can influence measuring accuracy, generally cable length should be controlled in the 10m.
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.The person skilled in the art obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art should be within protection scope of the present invention for improvement and modification that the present invention makes according to announcement of the present invention.
Claims (4)
1. the monitoring stray current of novel subway system is characterized in that: comprising: as a plurality of stray current online auto monitoring devices of this locality monitoring slave, form a metro stray current automatic monitoring system with the remote monitoring main frame by Industrial Ethernet;
Described system is to be the embedded system of processor with the microcontroller;
Be provided with around the processor of described system: switch power module, data acquisition module, ethernet communication module, ancillary hardware module and human-computer interaction module;
Data sharing between the described system slave, information fusion, synergic monitoring;
Described system comprises the self-adapting data acquisition software, improves sample frequency when train process measurement point.
2. monitoring stray current of novel subway as claimed in claim 1 system, it is characterized in that: the mutual plate of the shared personal-machine of all data acquisition board, data acquisition board has judged whether that by a pair of node the man-machine interaction plate is attached thereto.
3. monitoring stray current of novel subway as claimed in claim 1 system, it is characterized in that: when monitoring train through current sampling point, this this locality slave is broadcasted this information and is excited two adjacent slaves to carry out the data sampling task at synchronization on network.
4. monitoring stray current of novel subway as claimed in claim 3 system, it is characterized in that: the data and the same time that obtain are compared analysis with the historical data under the condition, whether the interval that just can learn these three sampled point places rail decreasing insulating phenomenon occurs, realizes localization of fault.
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| CN2007100366569A CN101226682B (en) | 2007-01-19 | 2007-01-19 | Device for monitoring stray current of novel subway |
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| CN2007100366569A CN101226682B (en) | 2007-01-19 | 2007-01-19 | Device for monitoring stray current of novel subway |
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| CN102541019B (en) * | 2012-01-16 | 2014-09-03 | 徐州世昌机电科技有限公司 | Automatic drainage device and control method thereof |
| CN102658784A (en) * | 2012-05-04 | 2012-09-12 | 徐州世昌机电科技有限公司 | Control method for one-way conduction device with arc extinction function |
| CN103439562A (en) * | 2013-08-28 | 2013-12-11 | 徐州润泽电气有限公司 | Portable stray current tester |
| CN104410376A (en) * | 2014-11-25 | 2015-03-11 | 天津市黎明时代轨道交通技术有限公司 | Power amplifier system capable of monitoring fault |
| CN104638910A (en) * | 2015-02-03 | 2015-05-20 | 中国能源建设集团广东省电力设计研究院 | Power system transformer substation communication equipment power supply with embedded direct-current power supply module structure |
| CN108267968B (en) * | 2017-01-03 | 2021-02-05 | 北京机电工程研究所 | Collaborative semi-physical simulation optical fiber data interaction security verification method |
| CN108548978A (en) * | 2018-06-14 | 2018-09-18 | 中车唐山机车车辆有限公司 | Train electromagnetic interference monitors system and train electromagnetic interference method for obtaining path |
| CN109143927B (en) * | 2018-08-17 | 2021-08-17 | 无锡市格林电工装备有限公司 | Method, device and system for eliminating stray current of running rail |
| CN109323131B (en) * | 2018-12-03 | 2021-04-09 | 北京市燃气集团有限责任公司 | Gas pipe network subway stray current interference detection system and arrangement method thereof |
| CN110217136B (en) * | 2019-05-29 | 2020-09-11 | 北京城建信捷轨道交通工程咨询有限公司 | Method for protecting subway stray current and monitoring device |
| CN110554238B (en) * | 2019-07-30 | 2023-11-24 | 中铁上海工程局集团华海工程有限公司 | Stray current prevention test method for whole ballast bed construction of subway |
| CN110954473A (en) * | 2019-11-27 | 2020-04-03 | 同济大学 | Intelligent wireless remote transmission gas pipeline potential monitoring system |
| CN111856973A (en) * | 2020-03-12 | 2020-10-30 | 同济大学 | Intelligent control system for buried steel pipe and rail drainage |
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