CN104793044A - Method and device for monitoring geomagnetically induced current of high-speed rails - Google Patents
Method and device for monitoring geomagnetically induced current of high-speed rails Download PDFInfo
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Abstract
The invention belongs to the technical field of monitoring of high-speed rail electrical systems and discloses a method and a device for monitoring geomagnetically induced current of high-speed rails. A high-speed rail geomagnetic storm damage monitoring and recording device comprises a traction main transformer and an earth box with a traction backflow collection function, a three-phase power source is connected into a traction substation, a traction backflow wire running through an earth wire, a PW protection wire and a choke transformer midpoint lead connected with two rail bars are arranged in the earth box which is an independent box structure , and the earth box is connected with an earth electrode of the traction transformer. Since interference exists in GIC (geomagnetically induced current) sampling signals, local high-frequency noise interference can be effectively eliminated by adopting a wavelet analysis method for variable-size localization analysis of time domain and frequency domain windows. The device comprises a signal acquisition sensor, a synchronous signal acquisition card and an industrial control computer. The device with a threshold alarming function is capable of sending alarm signals when monitoring quantity exceeds a threshold, so that influences of geomagnetic storm on a railway system can be known timely and conveniently. By monitoring for a period of time, direct-current magnetic bias current of the traction transformer is recorded to provide data for analysis on safety operation of a high-speed rail tractive power supply system.
Description
Technical field
The invention belongs to the monitoring technical field of high ferro electrical system, particularly a kind of high ferro geomagnetic induction current monitoring method and device.
Background technology
Along with the generation of strong spatial weather storm, the space current system in magnetosphere-ionosphere produces strong disturbance to the magnetic field of the earth, at this moment can observe global terrestrial magnetic field strong variations phenomenon on the ground, be called " magnetic storm ".According to the law of electromagnetic induction: time the magnetic field that becomes can induce electric field in the earth and form vagabond current because of the conductance of the earth, when ground existing the good artificial network of electric conductivity, (as: rail, transmission line of electricity, pipe laying etc.) will produce geomagnetic induction current (being called for short GIC) wherein.In the past, because China's major part territory is in Mid-low latitude region, and railway operating kilometrage was short, scope is little, speed is slow, and therefore the problem that affects of magnetic storm is not given prominence to.
In recent years, along with the high speed development of Chinese Railway, the construction of four vertical four horizontal high ferro nets, with traditional railway unlike, high-speed railway electrical system have employed in a large number as digitizing, automation equipments such as train operation control system, railway digital mobile communication system (GSM-R), Centralized Dispatching System (CTC), anti-disaster monitoring equipment, is but more vulnerable to electromagnetic interference (EMI).And the technology such as non-fragment orbit, interface height, make high ferro running environment become complicated.After 7.23 river in Zhejiang Province temperature line serious accidents occur, high ferro electrical system electromagnetic interference problem causes attention in the industry, and this is also the significant problem of relation railway operation safety.Therefore in the urgent need to one monitoring high ferro GIC, and recording the time that in high ferro, GIC produces, the device of duration and the order of magnitude thereof, is research GIC there is situation and providing effective means to the extent of injury that railway equipment runs in railway power system.
At National Nature fund project, (approval number: under 41374189) subsidizing, seminar affects problem at research GIC to China's high ferro electrical system.Because the monitoring of high ferro magnetic storm effect is not all also carried out both at home and abroad, so problem wishes to use for reference electrical network GIC achievement in research, researchs and analyses monitoring method and the technology of high ferro magnetic storm effect.
Summary of the invention
The object of the present invention is to provide a kind of high ferro geomagnetic induction current monitoring method and device.
The present invention adopts high ferro geomagnetic storm to encroach on monitoring record device, and record causes the monitoring variable of Traction networks and the affected each monitoring point of track circuit; The variable of monitoring comprises the DC current of traction transformer, AT institute autotransformer.Alerting signal is sent, to understand geomagnetic storm in time to the impact of the railway system when monitoring variable crosses limit value; Specific implementation is as follows:
1) GIC monitoring point is selected,
Design library part editor and reuse-concentrated grounding box (JD case) that traction current is collected is provided with in traction substation, for independent case structure, inside summarizes the traction current wire such as choke transformer center tap, PW protective wire, Through ground wire of connection two rail bar, and be extremely connected with transformer grounding, for the backflow of the minority traction current except refluxing through positive feeder;
In order to monitor the GIC size in Traction networks and track circuit rail, consider in traction substation it is do not allow railway system's external equipment is installed, in JD case with on the stube cable (or copper bar) of traction transformer earthing pole, rail, Hall element can be installed, Hall element is selected to install at tractive power supply system secondary side, and on the stube cable of rail, can not impact the operation of train;
2) extraction of high ferro GIC signal,
Compared with traction current and each harmonic, in sampled signal, GIC amplitude is very little, and the existence of various interference noise, makes sampled signal have comparatively low signal-to-noise ratio, if only by traditional low-pass filter filtering noise, the useful component in signal also can fuzzy fall.Wavelet analysis is the variable localization analysis of time domain and frequency domain window window size, effectively can remove local high-frequency noise in signal.The step of Wavelet Denoising Method is wavelet decomposition, threshold process wavelet coefficient and reconstruction signal, nowadays wavelet analysis is very extensive in the application of small echo in signal analysis, it may be used for process and filtering, time frequency analysis, SNR estimation and compensation and the extraction weak signal on border, does not introduce wavelet analysis in detail here.So the exploitation of this part mainly comprises Wavelet Denoising Method, wave filter, fast fourier transform decomposite GIC signal.
3) data acquisition and procession, data acquisition and processing (DAP) module is that realize high ferro GIC waveform recording and data record, concrete signal acquisition and processing is as follows using high ferro GIC threshold value and magnetic storm feature as startup and analyzing and processing criterion:
(1) direct current signal in certain traction substation in four tractive transformer Earth Phases, each Earth Phase of main transformer is 2 road signals (2*4).Because common magnetoelectric sensor cannot measure the accurate direct current signal of 0.1-0.001Hz, and the signal frequency range that Hall element can collect is very wide, then carry out direct current signal collection with Hall element;
(2) direct current signal in rail return current, altogether 1*2=2 road.The signal measured is the direct current signal flowing through choke transformer in rail loop, for analyzing the impact of this direct current on choke transformer.
(3) the above-mentioned electric signal that collects needs the form that first through signal regulating panel, the signal of access is transformed into the suitable treatment of data collecting card, mainly amplifies input signal, reduces, filtering interference signals etc.Signal access capture card carries out A/D conversion, samples, quantizes, cataloged procedure obtains digital signal to the analog quantity of input, then is transferred to built-in industrial control machine and adopts digital signal processing method carry out analyzing and processing and show result data by software.
4) data store and management
The signal gathered can be transferred to storage server after treatment, user friendly analysis and inquiry, be convenient to management, storage server belongs to rear end part, and at fore-end, the massive store unit of industrial computer is responsible for interim collection and storage data, and timing empties the data inside storage unit.
Described step 1) in the installation of Hall element comprise:
(1) installation of Hall element on traction transformer Earth Phase, on two cables that four Hall elements are set in the connection tractive transformer backflow earth point in grounding box or copper bar, with shielded cable, sensor secondary singal is drawn from grounding box after fixing sensor, lay to monitoring device main part office, for measuring the direct current flowing through four Secondary Side of Traction Transformers from scene through cable duct;
(2) installation of Hall element in rail return current, two Hall elements are set on a cable being connected to from rail choke transformer mid point grounding box, with shielded cable, sensor secondary singal is drawn after fixing Hall element, lay to monitoring device main part office from scene through cable duct; For measuring the direct current signal flowing through choke transformer mid point.
Described Hall element is Hall Open-loop sensors.
The invention has the beneficial effects as follows the feature according to producing GIC in high ferro electrical system, propose a kind of monitoring method efficiently, the present invention adopts high ferro geomagnetic storm to encroach on monitoring record device, and record causes the monitoring variable of Traction networks and the affected each monitoring point of track circuit; The variable of monitoring comprises the DC current of traction transformer, AT institute autotransformer.Alerting signal is sent, to understand geomagnetic storm in time to the impact of the railway system when monitoring variable crosses limit value.By the monitoring of a period of time, the tractive transformer DC magnetic bias current of record, voltage, magnetic field data for analyzing tractive transformer DC magnetic biasing, teleseme relay " dodges " situation red, for high ferro tractive power supply system Safety Operation Analysis provides data.Adopt Hall element, the wide frequency range of its signal measurement, alternating current-direct current all can be measured and highly sensitive, low price; For monitoring the GIC that geomagnetic storm causes in Traction networks, achieve the Measurement accuracy of the GIC produced in high ferro electrical system when geomagnetic storm is occurred.
Accompanying drawing explanation
Fig. 1 is that AT powers GIC circulation path in tractive power supply system.
Fig. 2 is for concentrating grounding box cut-away drawing.
Fig. 3 is the data acquisition process program flow diagram of monitoring method of the present invention.
Fig. 4 is monitoring modular composition diagram of the present invention.
Embodiment
The invention provides a kind of high ferro geomagnetic induction current monitoring method and device, adopt high ferro geomagnetic storm infringement monitoring record device, realize the monitoring of high ferro geomagnetic induction current.Be explained below in conjunction with accompanying drawing.
Fig. 1 is the circulation path figure of GIC at AT mode tractive power supply system.In figure, high ferro geomagnetic storm infringement monitoring record device is included in the traction transformer of access three-phase supply in traction substation, is provided with the grounding box of traction current collection; Grounding box is independent case structure, and inside summarizes the traction current wire of the choke transformer center tap of connection two rail bar, PW protective wire and Through ground wire, and is connected with tractive transformer earthing pole, for the backflow of minority traction current refluxed through positive feeder;
Do not allow railway system's external equipment is installed in traction substation, so the cable be connected with traction transformer earthing pole, rail in grounding box or copper bar install Hall element, Hall element is selected to install at tractive power supply system secondary side, and on the lead wire of rail, for monitoring the GIC size in Traction networks and track circuit rail, can not impact the operation of train;
The disturbance in magnetic field of the earth induces electric field on ground, acts on the tractive transformer earthing pole, the AT institute autotransformer mid point that are connected with the earth, produces the GIC circulated in Traction networks.The mechanical insulated joint at station track circuit two ends contains the choke transformer of connection two rail bars, does not affect for traction current backflow by insulation joint.And choke transformer mid point is connected with Through ground wire, inductively electric field action traction substation and AT between two earth points of rail, produce the GIC circulated in rail.Comprise rail two parts of high ferro Traction networks and track circuit system according to Fig. 1, GIC path, may to the tractive transformer in tractive power supply system, AT autotransformer, the choke transformer of track circuit and locomotive transformer have an impact.Due to the uncertainty that geomagnetic disturbance occurs, and the randomness of intensity is difficult to obtain high ferro GIC data by theory calculate.Therefore Real-Time Monitoring is carried out to GIC size by arranging sensor in systems in which, obtain measured data analytically the impact of signal magnetic field disturbance on system be direct most effective method again.By analyzing GIC circulation path, in order to study the impact of GIC on transformer in path, need to monitor the GIC size in Traction networks and rail loop, at tractive transformer earthing pole (in figure monitoring point 1), autotransformer earthing pole (in figure monitoring point 3), Hall element is installed, in monitoring Traction networks, flows through the GIC of tractive transformer, autotransformer; At rail choke transformer center tap (in figure monitoring point 2, monitoring point 4), the GIC size in Hall element Supervision of Traction Substation, the neighbouring rail of AT institute is installed.
Fig. 2 is that grounding box cut-away drawing concentrated by monitoring device, and 10 road signals mark on figure, and 10 road signals of collection of the present invention comprise:
1, the direct current signal in traction substation in four tractive transformer earthing poles, each ground connection very 1 road direct current signal of tractive transformer, altogether 2*4=8 road.The signal measured is the direct current signal flowing through traction transformer secondary side in Traction networks loop, affects the DC magnetic biasing of tractive transformer for analyzing this direct current signal;
2, the direct current signal in rail return current, altogether 1*2=2 road.The signal measured is the direct current signal flowing through choke transformer in rail loop, for analyzing the impact of this direct current signal on choke transformer.
Therefore, realize the monitoring of high ferro geomagnetic induction current and need collection 10 road direct current signal altogether.Because common magnetoelectric sensor cannot measure the accurate direct current signal of 0.1-0.001Hz, and the signal frequency range that Hall element can collect is very wide, carries out direct current signal collection with Hall element.
Illustrated data acquisition and processing (DAP) master routine as shown in Figure 3.When GIC monitoring device starts, data collecting card meeting auto-initiation, initialization is set up to communicate with main frame later and is prepared to transmit data.In GIC data acquisition, the data of t time are stored in scratchpad area (SPA), then the data gathered and threshold value are compared, if be less than threshold value, the data of scratchpad area (SPA) are emptied, otherwise send alerting signal, the GIC data of t time are saved on local hard drive and also continue to store h time data, the continuity storing data can be ensured, accurately can catch, record and store again the GIC of high ferro.
Fig. 4 is the introduction of monitoring device module, comprise signals collecting, signal extraction module, monitoring, alarming module, data analysis module and data memory module, there is undesired signal in the signal that wherein signal acquisition module collects, adopts DSP control data capture card to realize synchronized sampling; Signal extraction module in charge by required GIC signal extraction out, carries out the denoising of signal, removes high-frequency signal with low-pass filter by the method for wavelet transformation; Monitoring, alarming module installation high ferro GIC threshold value also carries out warning reminding as criterion, and the alarm module of device makes the actuating of relay, sends warning; The voltage and current signal that data analysis module is responsible for collecting is analyzed; Data memory module is responsible for storage voltage and current signal, and data are stored in Access database, and by the data preparation warehouse-in gathered, the GIC data of high ferro are kept on table corresponding on database server respectively.
Claims (4)
1. a high ferro geomagnetic induction current monitoring method, is characterized in that, adopt high ferro geomagnetic storm infringement monitoring record device, record causes the monitoring variable of Traction networks and the affected each monitoring point of track circuit; The variable of monitoring comprises the DC current of traction transformer, AT institute autotransformer, sends alerting signal when monitoring variable crosses limit value, to understand geomagnetic storm in time to the impact of the railway system; Specific implementation is as follows:
1) GIC monitoring point is selected,
Described high ferro geomagnetic storm infringement monitoring record device is included in the traction transformer of access three-phase supply in traction substation, is provided with the grounding box of traction current collection; Grounding box is independent case structure, and inside summarizes the traction current wire of the choke transformer center tap of connection two rail bar, PW protective wire and Through ground wire, and is connected with tractive transformer earthing pole, for the backflow of minority traction current refluxed through positive feeder;
Do not allow railway system's external equipment is installed in traction substation, so the cable be connected with traction transformer earthing pole, rail in grounding box or copper bar install Hall element, Hall element is selected to install at tractive power supply system secondary side, and on the lead wire of rail, for monitoring the GIC size in Traction networks and track circuit rail, can not impact the operation of train;
2) extraction of high ferro GIC signal, compared with traction current and each harmonic, in sampled signal, GIC amplitude is very little, and the existence of various interference noise, makes sampled signal have comparatively low signal-to-noise ratio; If only by traditional low-pass filter filtering noise, useful component in signal also can fuzzy fall, adopt wavelet analysis method to time domain and the variable localization analysis of frequency domain window window size, then effectively remove local high-frequency noise in signal, the step of Wavelet Denoising Method is wavelet decomposition, threshold process wavelet coefficient and reconstruction signal, for process and filtering, time frequency analysis, SNR estimation and compensation and the extraction weak signal on border, fast fourier transform decomposites GIC signal;
3) data acquisition and procession, data acquisition and processing (DAP) module is that realize high ferro GIC waveform recording and data record, concrete signal acquisition and processing is as follows using high ferro GIC threshold value and magnetic storm feature as startup and analyzing and processing criterion:
(1) in traction substation, each Earth Phase in four tractive transformer Earth Phases is 2 road direct current signals, total 2*4=8 road direct current signal, because common magnetoelectric sensor cannot measure the accurate direct current signal of 0.1-0.001Hz, and the signal frequency range that Hall element can collect is very wide, then carry out direct current signal collection with Hall element;
(2) totally 2 road direct current signals in rail return current, the signal of measurement is the direct current signal flowing through choke transformer in rail loop, for analyzing the impact of this direct current on choke transformer;
(3) the above-mentioned direct current signal collected is simulating signal, need the suitable processing form first through signal regulating panel, the analog-signal transitions of access being become data collecting card, the simulating signal access capture card being about to input carries out A/D and converts digital signal and filtering interference signals to; Obtain digital signal after afterwards the analog quantity of input being sampled, quantize and encoded, then be transferred to built-in industrial control machine, and adopt digital signal processing method to carry out analyzing and processing, display result data;
4) data store and management, the digital signal gathered can be transferred to storage server after treatment, user friendly analysis and inquiry, be convenient to management, storage server belongs to rear end part, and at fore-end, the massive store unit of industrial computer is responsible for the interim data that gather and store, and timing empties the data inside storage unit.
2. a kind of high ferro geomagnetic induction current monitoring method according to claim 1, is characterized in that, described step 1) in the installation of Hall element comprise:
(1) installation of Hall element on traction transformer Earth Phase, on two cables that four Hall elements are set in the connection tractive transformer backflow earth point in grounding box or copper bar, with shielded cable, sensor secondary singal is drawn from grounding box after fixing sensor, lay to monitoring device main part office, for measuring the direct current flowing through four Secondary Side of Traction Transformers from scene through cable duct;
(2) installation of Hall element in rail return current, two Hall elements are set on a cable being connected to from rail choke transformer mid point grounding box, with shielded cable, sensor secondary singal is drawn after fixing Hall element, lay to monitoring device main part office from scene through cable duct; For measuring the direct current signal flowing through choke transformer mid point.
3. a device for method use described in claim 1, is characterized in that, high ferro geomagnetic storm infringement monitoring record device is included in the traction transformer of access three-phase supply in traction substation, is provided with the grounding box of traction current collection; Grounding box is independent case structure, and inside summarizes the traction current wire of the choke transformer center tap of connection two rail bar, PW protective wire and Through ground wire, and is connected with tractive transformer earthing pole, for the backflow of minority traction current refluxed through positive feeder.
4. device according to claim 3, do not allow railway system's external equipment is installed in traction substation, so the cable be connected with traction transformer earthing pole, rail in grounding box or copper bar install Hall element, Hall element is selected to install at tractive power supply system secondary side, and on the lead wire of rail, for monitoring the GIC size in Traction networks and track circuit rail, can not impact the operation of train.
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Cited By (7)
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| CN105260504A (en) * | 2015-09-11 | 2016-01-20 | 中国石油大学(北京) | Calculation method of GIC and PSP of buried oil and gas pipeline influenced by geomagnetic storm |
| CN106896296A (en) * | 2017-04-18 | 2017-06-27 | 河北中车科技发展有限公司 | High-speed railway traction power supply signal monitoring system and method |
| CN113032875A (en) * | 2021-03-17 | 2021-06-25 | 中铁第四勘察设计院集团有限公司 | High-speed rail tunnel section simulation detection method based on direct-current path model |
| CN113049868A (en) * | 2021-03-10 | 2021-06-29 | 优利德科技(中国)股份有限公司 | Alternating current and direct current measuring device and measuring method |
| CN113067512A (en) * | 2021-03-17 | 2021-07-02 | 中铁第四勘察设计院集团有限公司 | Railway electrification magnetic bias suppression system and method |
| CN113206544A (en) * | 2021-03-18 | 2021-08-03 | 国网内蒙古东部电力有限公司电力科学研究院 | Power grid GIC monitoring device based on transformer high-voltage incoming and outgoing lines |
| WO2022193661A1 (en) * | 2021-03-18 | 2022-09-22 | 国网内蒙古东部电力有限公司电力科学研究院 | Transformer reactive power disturbance calculation method based on gic monitoring device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105260504A (en) * | 2015-09-11 | 2016-01-20 | 中国石油大学(北京) | Calculation method of GIC and PSP of buried oil and gas pipeline influenced by geomagnetic storm |
| CN105260504B (en) * | 2015-09-11 | 2018-02-02 | 中国石油大学(北京) | The GIC and PSP computational methods that a kind of buried oil-gas pipeline is influenceed by geomagnetic storm |
| CN106896296A (en) * | 2017-04-18 | 2017-06-27 | 河北中车科技发展有限公司 | High-speed railway traction power supply signal monitoring system and method |
| CN106896296B (en) * | 2017-04-18 | 2023-06-13 | 河北中车科技发展有限公司 | High-speed railway traction power supply signal monitoring system and method |
| CN113049868A (en) * | 2021-03-10 | 2021-06-29 | 优利德科技(中国)股份有限公司 | Alternating current and direct current measuring device and measuring method |
| CN113032875A (en) * | 2021-03-17 | 2021-06-25 | 中铁第四勘察设计院集团有限公司 | High-speed rail tunnel section simulation detection method based on direct-current path model |
| CN113067512A (en) * | 2021-03-17 | 2021-07-02 | 中铁第四勘察设计院集团有限公司 | Railway electrification magnetic bias suppression system and method |
| CN113206544A (en) * | 2021-03-18 | 2021-08-03 | 国网内蒙古东部电力有限公司电力科学研究院 | Power grid GIC monitoring device based on transformer high-voltage incoming and outgoing lines |
| WO2022193661A1 (en) * | 2021-03-18 | 2022-09-22 | 国网内蒙古东部电力有限公司电力科学研究院 | Transformer reactive power disturbance calculation method based on gic monitoring device |
| CN113206544B (en) * | 2021-03-18 | 2022-11-15 | 国网内蒙古东部电力有限公司电力科学研究院 | Power grid GIC monitoring device based on transformer high-voltage incoming and outgoing lines |
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Application publication date: 20150722 |