CN112526267A - Electromagnetic environment monitoring system for electrified railway - Google Patents
Electromagnetic environment monitoring system for electrified railway Download PDFInfo
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- CN112526267A CN112526267A CN202011378728.XA CN202011378728A CN112526267A CN 112526267 A CN112526267 A CN 112526267A CN 202011378728 A CN202011378728 A CN 202011378728A CN 112526267 A CN112526267 A CN 112526267A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/008—Testing of electric installations on transport means on air- or spacecraft, railway rolling stock or sea-going vessels
Abstract
The invention discloses an electromagnetic environment monitoring system for an electrified railway, which comprises: the signal receiving and collecting equipment is used for collecting signals and outputting five collected signals; the power synthesizer is used for carrying out power synthesis and impedance matching processing on the first path of collected signals and the second path of collected signals; the real-time frequency spectrograph is used for carrying out FFT operation processing on the power synthesis signal; the receiver is used for detecting the third path of collected signals; the power distributor is used for averagely distributing the fourth path of collected signals to the frequency spectrograph and the oscilloscope for collection and processing respectively; the oscilloscope is used for acquiring and processing the intensity of the fourth path of acquired signals according to a frequency sequence; the frequency spectrograph is used for collecting and processing the intensity of the fourth path of collected signals according to a time sequence; and the control computer is used for recording, storing and displaying the signals. The invention can accurately obtain the electromagnetic environment data inside and outside the train in the normal running process of the train, and provides guarantee for the normal running of the electrified railway.
Description
Technical Field
The invention belongs to the technical field of electromagnetic compatibility testing, and particularly relates to an electromagnetic environment monitoring system for an electrified railway.
Background
At present, an electrified railway in China adopts a power frequency single-phase alternating current 25kV power supply system, and power required by a train in the electrified railway is provided by a traction power supply system, wherein a contact network in the system belongs to a typical asymmetric high-voltage transmission line, an unbalanced electromagnetic field can be generated, interference is generated on electronic equipment of the train, and particularly, electromagnetic interference such as stronger electric voltage distortion and transient pulse can be generated when traction current of two tracks is unbalanced, a pantograph network is off-line, an excessive phase is separated, and lightning stroke is encountered, so that influence is generated on an electric system; on the other hand, the electric system of the electrified railway and the return of the traction bow net share a rail as a transmission loop, and certain conducted interference exists between the electric system and the traction bow net, so that the electromagnetic environment of the electrified railway needs to be monitored in real time, and the normal running of the electrified railway is guaranteed.
The traditional measuring method has two types:
(1) monitoring points are arranged at a certain distance outside the track, and measurement is carried out according to the national GB/T24338 track traffic electromagnetic compatibility standard so as to evaluate the radiation emission of the whole railway system to external equipment. The disadvantages of this method are: the electromagnetic environment inside the train cannot be accurately obtained, and the electromagnetic environment of the whole line cannot be reflected.
(2) The method can obtain the radiation emission of low-frequency magnetic fields in train groups to people and equipment, but does not consider a plurality of factors such as train running speed, spark discharge and the like, and cannot obtain the maximum radiation condition of a system through measurement.
Disclosure of Invention
The technical problem of the invention is solved: the defects of the prior art are overcome, and the electromagnetic environment monitoring system for the electrified railway is provided, so that the electromagnetic environment data inside and outside the train can be accurately obtained in the normal running process of the train, and the normal running of the electrified railway is guaranteed.
In order to solve the technical problem, the invention discloses an electromagnetic environment monitoring system of an electrified railway, which comprises:
the signal receiving and collecting equipment is used for collecting space radiation electromagnetic interference signals and conduction electromagnetic interference signals existing in the running process of the electrified train and outputting five collected signals;
the power synthesizer is used for receiving the first path of collected signals and the second path of collected signals output by the signal receiving and collecting equipment, performing power synthesis and impedance matching on the first path of collected signals and the second path of collected signals, and outputting power synthesized signals so as to transmit the first path of collected signals and the second path of collected signals to the real-time frequency spectrograph through the radio frequency cable in a low-loss manner;
the real-time frequency spectrograph is used for receiving the power synthesis signal output by the power synthesizer, and performing FFT operation processing on the power synthesis signal to obtain an operation processing result, so that transient interference signals in the current frequency band are not omitted;
the receiver is used for receiving the third path of collected signals output by the signal receiving and collecting equipment, detecting the third path of collected signals and then sending the detected third path of collected signals to the control computer;
the power distributor is used for receiving a fourth path of collected signals output by the signal receiving and collecting equipment, and averagely distributing the fourth path of collected signals to the frequency spectrograph and the oscilloscope for collection and processing respectively;
the oscilloscope is used for acquiring and processing the intensity of the fourth path of acquired signals according to a frequency sequence and sending an acquisition processing result to the control computer;
the frequency spectrograph is used for collecting and processing the intensity of the fourth path of collected signals according to a time sequence and sending the collected and processed result to the control computer;
and the control computer is used for recording, storing and displaying the output signals of the real-time frequency spectrograph, the receiver, the oscilloscope and the frequency spectrograph and the fifth path of collected signals output by the signal receiving and collecting equipment.
In the above-mentioned electrified railway electromagnetic environment monitoring system, signal reception collection equipment includes: two transient field intensity receivers, a 25 Hz-100 kHz magnetic field loop antenna, a 9 kHz-30 MHz magnetic field loop antenna, a 30 MHz-18 GHz receiving antenna and a current probe.
In the electromagnetic environment monitoring system of the electrified railway, the first path of collected signals are 25 Hz-100 kHz space electromagnetic interference signals collected by a 25 Hz-100 kHz magnetic field loop antenna.
In the electromagnetic environment monitoring system for the electrified railway, the second path of collected signals are 9 kHz-30 MHz space electromagnetic interference signals collected by a 9 kHz-30 MHz magnetic field loop antenna.
In the electromagnetic environment monitoring system for the electrified railway, the third collected signal is a 30 MHz-18 GHz electromagnetic interference signal collected by a 30 MHz-18 GHz receiving antenna.
In the electromagnetic environment monitoring system for the electrified railway, the fourth path of collected signals are conducted electromagnetic interference signals received through the coupling of the current probe.
In the electromagnetic environment monitoring system of the electrified railway, the fifth path of collected signals are 5 Hz-400 kHz electromagnetic interference signals collected by two transient field intensity receivers.
In the above electromagnetic environmental monitoring system for an electrified railway, the system further comprises: and the storage equipment is used for storing the power synthesis signal received by the real-time frequency spectrograph and the operation processing result output by the real-time frequency spectrograph so as to control the computer to read.
The invention has the following advantages:
(1) the invention discloses an electromagnetic environment monitoring system for an electrified railway, which is characterized in that measuring points are arranged inside and outside a train, electromagnetic environment characteristic data of a traction power supply system in the running process of the train is obtained by adopting a distributed measuring means, transient electromagnetic interference generated by thunder and lightning, pantograph offline and the like in the running process of the train is obtained by utilizing a real-time frequency spectrum capturing and stream disk storage technology, the electromagnetic environment data inside and outside the train can be accurately obtained in the normal running process of the train, and the normal running of the electrified railway is guaranteed.
(2) The invention discloses an electromagnetic environment monitoring system for an electrified railway, which can realize uninterrupted monitoring of an electromagnetic environment for an electrified train in operation, cover a power frequency magnetic field, a radio frequency electromagnetic field, a ground wire current and the like in a monitoring range, and can realize real-time monitoring of a space electromagnetic field time domain and a space electromagnetic field frequency domain for a complex electromagnetic environment under special working conditions of short circuit, open circuit, off-line and excessive equalization of a pantograph-catenary.
(3) The invention discloses an electromagnetic environment monitoring system for an electrified railway, which solves the problems that the transient interference has electromagnetic influence strength on the electrified railway system, the influence mode is diversified and the like and is difficult to capture, and realizes the acquisition of transient interference signals in the running process of a train.
(4) The invention discloses an electromagnetic environment monitoring system for an electrified railway, which adopts a mode of simultaneously receiving and acquiring by a plurality of sensors and a plurality of receivers, thereby greatly improving the test accuracy and the test efficiency.
Drawings
FIG. 1 is a schematic structural diagram of an electromagnetic environment monitoring system for an electrified railway according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The invention discloses an electromagnetic environment monitoring system for an electrified railway, which has one of the core ideas: measuring points are arranged inside and outside the electrified train, electromagnetic environment characteristic data of the electrified train in the running process is obtained by utilizing various sensors such as a transient field intensity tester, a current probe and an antenna and adopting a distributed measuring means, and meanwhile, the frequency spectrum data of transient interference is obtained by utilizing a real-time frequency spectrum capturing and flow table storage technology, so that technical support is provided for the normal running of an electrified railway system.
Referring to fig. 1, in this embodiment, the electromagnetic environmental monitoring system for an electrified railway includes:
and the signal receiving and collecting equipment is used for collecting space radiation electromagnetic interference signals and conduction electromagnetic interference signals existing in the running process of the electrified train and outputting five collected signals.
In this embodiment, the signal receiving and acquiring device may specifically include: two transient field intensity receivers, a 25 Hz-100 kHz magnetic field loop antenna, a 9 kHz-30 MHz magnetic field loop antenna, a 30 MHz-18 GHz receiving antenna and a current probe. Wherein, a transient field intensity receiver is arranged outside the electric train carriage; the other transient field intensity receiver, the 25 Hz-100 kHz magnetic field loop antenna, the 9 kHz-30 MHz magnetic field loop antenna and the 30 MHz-18 GHz receiving antenna are all arranged inside the electric train carriage and close to the car window, and the current probe is arranged at the ground wire of the train. The transient field intensity receiver has frequency range of 5 Hz-400 kHz and response time lower than 1ns, is connected with a control computer in an optical fiber mode, and mainly measures the comprehensive strength of a power frequency magnetic field, including transient interference.
Preferably, the first path of collected signal is 25 Hz-100 kHz space electromagnetic interference signal collected by a 25 Hz-100 kHz magnetic field loop antenna. The second path of collected signals are 9 kHz-30 MHz space electromagnetic interference signals collected by a 9 kHz-30 MHz magnetic field loop antenna. The third collection signal is a 30 MHz-18 GHz electromagnetic interference signal collected by a 30 MHz-18 GHz receiving antenna. The fourth path of collected signals are conducted electromagnetic interference signals received through the current probe in a coupling mode. The fifth path of collected signals are 5 Hz-400 kHz electromagnetic interference signals collected by two transient field intensity receivers.
And the power synthesizer is used for receiving the first path of collected signals and the second path of collected signals output by the signal receiving and collecting equipment, performing power synthesis and impedance matching on the first path of collected signals and the second path of collected signals, and outputting power synthesized signals so as to transmit the first path of collected signals and the second path of collected signals to the real-time frequency spectrograph through the radio frequency cable in a low-loss manner.
In this embodiment, the 25Hz to 100kHz magnetic field loop antenna and the 9kHz to 30MHz magnetic field loop antenna are respectively connected to the power combiner through radio frequency cables.
And the real-time frequency spectrograph is used for receiving the power synthesis signal output by the power synthesizer, and performing FFT operation processing on the power synthesis signal to obtain an operation processing result, so that transient interference signals in the current frequency band are not omitted.
In this embodiment, the real-time bandwidth of the real-time spectrometer is greater than 160MHz, and the real-time spectrometer can simultaneously perform time domain and frequency domain scanning on the electromagnetic field of 25Hz to 30 MHz.
And the receiver is used for receiving the third path of collected signals output by the signal receiving and collecting equipment, detecting the third path of collected signals and then sending the detected third path of collected signals to the control computer.
In the embodiment, the receiving antenna of 30 MHz-18 GHz is connected with the receiver through the radio frequency cable, and the receiver adopts a double scanning mode of maximum maintenance and real-time refreshing to realize scanning and monitoring of the electric field frequency spectrum in the frequency band; the receiver is connected with the control computer through a network cable, and scanning data of the receiver is stored in the memory of the control computer at regular time.
And the power distributor is used for receiving the fourth path of collected signals output by the signal receiving and collecting equipment, and averagely distributing the fourth path of collected signals to the frequency spectrograph and the oscilloscope for collection and processing respectively.
In this embodiment, the current probe is connected to the power splitter by a radio frequency cable.
And the oscilloscope is used for acquiring and processing the intensity of the fourth path of acquired signals according to the frequency sequence and sending the acquired and processed result to the control computer.
And the frequency spectrograph is used for collecting and processing the strength of the fourth path of collected signals according to the time sequence and sending the collected and processed result to the control computer.
In this embodiment, the oscilloscope and the spectrometer can obtain the time domain and frequency domain waveforms of the current at the ground wire of the train, and the control computer realizes the control and data management of the oscilloscope and the spectrometer through the network cable.
And the control computer is used for recording, storing and displaying the output signals of the real-time frequency spectrograph, the receiver, the oscilloscope and the frequency spectrograph and the fifth path of collected signals output by the signal receiving and collecting equipment.
And the storage equipment is used for storing the power synthesis signal received by the real-time frequency spectrograph and the operation processing result output by the real-time frequency spectrograph so as to control the computer to read.
In this embodiment, the power synthesis signal received by the real-time spectrometer and the output operation processing result are stored by using a stream disk storage technology.
Therefore, the electromagnetic environment monitoring system for the electrified railway can simultaneously acquire electromagnetic environment data such as power frequency magnetic fields, radio frequency electromagnetic fields, ground wire currents and the like inside and outside the train in the running process of the train through reasonable system installation, solves the problems that transient interference is difficult to capture, such as the instantaneity of electromagnetic influence strength generated on the electrified railway system and the diversity of influence modes, and the like, realizes the acquisition of transient interference signals in the running process of the train, and provides guarantee for the normal running of the electrified railway system. The electromagnetic environment monitoring system for the electrified railway adopts a mode that multiple sensors and multiple receivers simultaneously receive and collect data, mutual verification is carried out, the testing accuracy and the testing efficiency are greatly improved, the power combiner and the power divider are reasonably utilized, the impedance matching problem of the multiple sensors is solved, and the utilization rate of equipment resources is improved.
The electromagnetic environment monitoring system for the electrified railway at least has the following characteristics:
(1) the electromagnetic environment of the train can be acquired in the running state processes of the train such as standstill, acceleration, deceleration, normal running and the like.
(2) And acquiring power frequency magnetic field, radio frequency electromagnetic field and ground wire current electromagnetic characteristic data in the railway environment by adopting various sensor modes such as a transient field intensity tester, a current probe, an antenna and the like.
(3) By adopting a double receiving mode of the transient field intensity tester, the antenna and the real-time frequency spectrograph, the accurate acquisition of transient interference signals caused by thunder and lightning, bow net off-line and the like in the running process of the train is realized.
(4) And simultaneously acquiring comprehensive field intensity and frequency spectrum data in an electromagnetic environment by adopting a mode of combining a transient field intensity tester and multiple antennas for receiving.
(5) The multi-antenna combination receiving is carried out by adopting a power synthesizer, and the scanning data of a plurality of frequency bands are obtained at the same time, so that the problem of impedance matching among multiple antennas is solved, and the resource utilization rate of the sampling equipment is improved.
(6) And acquiring the radio frequency electromagnetic field of the railway electromagnetic environment by using a radio frequency receiving antenna acquisition mode.
(7) And acquiring the conduction current at the ground wire of the electrified train by using a current probe acquisition mode.
(8) And sampling the combination of the oscilloscope and the frequency spectrograph by using the power divider, and simultaneously acquiring time domain and frequency domain data of a plurality of frequency bands.
(9) The method comprises the steps of respectively setting measuring points inside and outside a train and arranging transient field intensity testers, and obtaining the electromagnetic environments inside and outside the train at the same moment.
(10) And the problem of large data volume of real-time spectrum capture is solved by adopting a stream disk storage technology.
(11) And a control computer is adopted to control the whole system, so that the time uniformity of the electromagnetic environment data obtained by each sensor is ensured.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (8)
1. An electrified railway electromagnetic environment monitoring system, comprising:
the signal receiving and collecting equipment is used for collecting space radiation electromagnetic interference signals and conduction electromagnetic interference signals existing in the running process of the electrified train and outputting five collected signals;
the power synthesizer is used for receiving the first path of collected signals and the second path of collected signals output by the signal receiving and collecting equipment, performing power synthesis and impedance matching on the first path of collected signals and the second path of collected signals, and outputting power synthesized signals so as to transmit the first path of collected signals and the second path of collected signals to the real-time frequency spectrograph through the radio frequency cable in a low-loss manner;
the real-time frequency spectrograph is used for receiving the power synthesis signal output by the power synthesizer, and performing FFT operation processing on the power synthesis signal to obtain an operation processing result, so that transient interference signals in the current frequency band are not omitted;
the receiver is used for receiving the third path of collected signals output by the signal receiving and collecting equipment, detecting the third path of collected signals and then sending the detected third path of collected signals to the control computer;
the power distributor is used for receiving a fourth path of collected signals output by the signal receiving and collecting equipment, and averagely distributing the fourth path of collected signals to the frequency spectrograph and the oscilloscope for collection and processing respectively;
the oscilloscope is used for acquiring and processing the intensity of the fourth path of acquired signals according to a frequency sequence and sending an acquisition processing result to the control computer;
the frequency spectrograph is used for collecting and processing the intensity of the fourth path of collected signals according to a time sequence and sending the collected and processed result to the control computer;
and the control computer is used for recording, storing and displaying the output signals of the real-time frequency spectrograph, the receiver, the oscilloscope and the frequency spectrograph and the fifth path of collected signals output by the signal receiving and collecting equipment.
2. The electromagnetic environmental monitoring system for electrified railways of claim 1, characterized in that the signal receiving and collecting device comprises: two transient field intensity receivers, a 25 Hz-100 kHz magnetic field loop antenna, a 9 kHz-30 MHz magnetic field loop antenna, a 30 MHz-18 GHz receiving antenna and a current probe.
3. The system of claim 2, wherein the first collected signal is a 25Hz to 100kHz spatial electromagnetic interference signal collected by a 25Hz to 100kHz magnetic field loop antenna.
4. The electromagnetic environmental monitoring system for the electrified railway of claim 2, wherein the second path of collected signals is 9 kHz-30 MHz space electromagnetic interference signals collected by a 9 kHz-30 MHz magnetic field loop antenna.
5. The electromagnetic environmental monitoring system for the electrified railway of claim 2, wherein the third collected signal is a 30 MHz-18 GHz electromagnetic interference signal collected by a 30 MHz-18 GHz receiving antenna.
6. The system of claim 2, wherein the fourth collected signal is a conducted electromagnetic interference signal received via a current probe coupling.
7. The electromagnetic environmental monitoring system for the electrified railway of claim 2, wherein the fifth collected signal is an electromagnetic interference signal of 5Hz to 400kHz collected by two transient field intensity receivers.
8. The electrified railway electromagnetic environment monitoring system of claim 1, further comprising: and the storage equipment is used for storing the power synthesis signal received by the real-time frequency spectrograph and the operation processing result output by the real-time frequency spectrograph so as to control the computer to read.
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Cited By (1)
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| CN114839467A (en) * | 2022-05-27 | 2022-08-02 | 苏州浪潮智能科技有限公司 | Testing method and device for efficient positioning server to conduct cable exceeding standard |
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