CN111157848A - Traveling wave fault positioning method and system for high-speed railway traction power supply system - Google Patents
Traveling wave fault positioning method and system for high-speed railway traction power supply system Download PDFInfo
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- CN111157848A CN111157848A CN202010018392.XA CN202010018392A CN111157848A CN 111157848 A CN111157848 A CN 111157848A CN 202010018392 A CN202010018392 A CN 202010018392A CN 111157848 A CN111157848 A CN 111157848A
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- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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Abstract
The invention discloses a method and a system for locating traveling wave faults of a high-speed railway traction power supply system, which comprises the following steps: the space electromagnetic field traveling wave fault locating device detects a contact network fault traveling wave signal in a space electromagnetic field receiving mode, the received fault traveling wave signal is processed to obtain an energy amplitude of the signal, when the energy amplitude of the voltage traveling wave signal exceeds a preset value, wave recording is started, a traveling wave waveform is recorded, and the recorded wave recording waveform is uploaded to the background analysis main station; and after the background analysis main station receives the uploaded recording waveforms, respectively positioning the initial traveling wave head of the space electromagnetic field traveling wave fault positioning device, recording the time for the initial traveling wave head to reach the space electromagnetic field traveling wave fault positioning device, and calculating the accurate position of a fault point according to the time quantum. The distance measuring method is not influenced by line parameters, an operation mode and short-circuit impedance, and has high distance measuring accuracy.
Description
Technical Field
The invention belongs to the technical field of power supply line fault positioning, and particularly relates to a traveling wave fault positioning method and a traveling wave fault positioning system for a high-speed railway traction power supply system.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The high-speed rail traction power supply system is a special power supply system, an AT power supply mode is adopted, a power supply line generally reaches 20km-30km, traction power supply voltage is increased to 55KV by adding an AT autotransformer and an F feeder to a traction network, power supply capacity and power supply distance are enhanced, interference on a communication line is reduced, the traction network directly supplies power to a motor train unit, and the requirement on power supply reliability is extremely high. However, the traction net has various environments along the way, the load impact is obvious, and the fault examination and repair are difficult.
The distance measurement methods mainly adopted AT present are an impedance analysis method and an AT (auto-transformer) current-pull ratio method. The impedance analysis method is to calculate the fault impedance according to the voltage and current collected during the fault, and then to perform fault location according to the principle that the line impedance is in direct proportion to the line length. The AT current-drawing ratio method is used for fault location according to the principle that the current drawing of the AT autotransformer is in inverse proportion to the line length. However, the two distance measurement modes are greatly influenced by the operation mode of the system and the short-circuit impedance, the distance measurement precision cannot be reliably ensured, and a short-circuit test is required to correct the line parameters.
With the gradual maturity of the satellite synchronization technology, the line fault location technology based on the traveling wave double-end location has great breakthrough, the location precision is high, and the line fault location technology is not influenced by the operation mode and the grounding impedance. However, the traditional traveling wave acquisition mode is obtained through a secondary loop of an electromagnetic mutual inductor, which can generate great attenuation and oscillation on the initial traveling wave head and is not beneficial to the identification of the initial traveling wave head; secondly, secondary equipment wiring of the transformer substation needs to be modified, and the design and operation mode need to be changed, which is not favorable for popularization and application of the technology.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the traveling wave fault positioning method of the high-speed railway traction power supply system, which has high positioning accuracy and can effectively guarantee the safe operation of the high-speed railway power supply system.
In order to achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
high-speed railway pulls power supply system travelling wave fault location system includes:
the non-contact traveling wave fault positioning device detects a contact network fault traveling wave signal in a space electromagnetic field receiving mode, the received fault traveling wave signal is processed to obtain an energy amplitude of the signal, when the energy amplitude of the traveling wave signal exceeds a preset value, wave recording is started, a traveling wave waveform is recorded, and the recorded wave recording waveform is uploaded to the background analysis main station;
and after the background analysis main station receives the uploaded wave recording waveforms, the background analysis main station respectively positions the initial traveling wave head of the space electromagnetic field traveling wave fault positioning device, records the time of the initial traveling wave head reaching the space electromagnetic field traveling wave fault positioning device, and calculates the accurate position of a fault point according to the time quantum.
According to the further technical scheme, the space electromagnetic field traveling wave fault positioning device is respectively installed below traction power supply network cables of a traction substation, an AT station and a subarea in a high-speed rail traction power supply system;
according to the further technical scheme, a power supply system of the space electromagnetic field traveling wave fault positioning device comprises a solar cell panel, a super capacitor and a storage battery;
according to the technical scheme, after any two devices in the space electromagnetic field traveling wave fault positioning device are started, the background analysis master station calculates the position of a fault point by a double-end traveling wave method; if the three devices are all started, two devices with the closest fault time are selected to perform ranging by using a double-end traveling wave method.
The method for locating the traveling wave fault of the high-speed railway traction power supply system comprises the following steps:
collecting space traveling wave signals: detecting a contact network fault traveling wave signal in a mode of receiving a space electromagnetic field;
starting wave recording: processing the received fault traveling wave signal to obtain the energy amplitude of the signal, starting wave recording when the energy amplitude of the traveling wave signal exceeds a preset value, and recording the waveform of the traveling wave;
uploading a waveform: the recorded wave recording waveform is uploaded to a background analysis main station through the Internet of things mobile communication technology;
fault positioning: and after the background analysis main station receives the uploaded wave recording waveforms, respectively positioning the initial traveling wave heads, recording the time of the initial traveling wave heads reaching the device, and calculating the accurate position of the fault point according to the time quantum.
According to the further technical scheme, the space electromagnetic field traveling wave fault positioning device firstly carries out high-pass filtering on the received fault traveling wave signal and then carries out integral calculation to obtain the energy amplitude of the signal.
In a further technical scheme, the traveling wave waveform data is provided with absolute timestamp information of Beidou and GPS satellite time setting, and files are named according to absolute time of starting time.
According to the further technical scheme, the fault time of the fault point is determined by detecting the time of the initial traveling wave head.
The above one or more technical solutions have the following beneficial effects:
the invention provides a fault location method without changing the design structure of the conventional high-speed rail traction power supply system.
The distance measurement method calculates the fault position according to the accurate time of the space electromagnetic field traveling wave signal reaching the device caused by the line fault and the propagation speed of the traveling wave, is not influenced by line parameters, a running mode and short-circuit impedance, and has high distance measurement accuracy.
The distance measuring method does not need power failure during installation, debugging and maintenance, and has convenient use and low maintenance cost.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is an overall system block diagram of an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a positioning apparatus collecting traveling fault waves according to an embodiment of the present disclosure.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example one
The embodiment discloses a traveling wave fault positioning method of a high-speed railway traction power supply system, which comprises the following steps:
collecting space traveling wave signals: a non-contact traveling wave fault positioning device is arranged below a network cable on a contact network of a traction substation, an AT (automatic transmission) station and a subarea in a high-speed rail traction power supply system, and the device consists of a non-contact traveling wave sensor, a signal amplification circuit, a calculation unit, a communication unit and a power supply unit. At the moment of line fault, a virtual power supply which is equal to the voltage before the fault in magnitude and opposite in direction is suddenly added to a fault point equivalently. The additional virtual power supply is a wave source of a fault transient traveling wave process, and an initial traveling wave surge generated by the additional virtual power supply is transmitted from a fault point to two ends of a line in an electromagnetic wave mode through an air medium between a power transmission line and the ground. The device detects the contact net fault traveling wave signal by receiving a space electromagnetic field.
Starting wave recording: and carrying out high-pass filtering on the received fault traveling wave signal, and then carrying out integral calculation to obtain the energy amplitude of the signal. And when the energy amplitude of the traveling wave signal exceeds a preset value, starting wave recording and recording the waveform of the traveling wave.
Uploading a waveform: and the recorded wave recording waveform is uploaded to the background analysis master station through the Internet of things mobile communication technology.
Fault positioning: after the background analysis master station receives the recorded wave waveforms uploaded by the 3 devices, the initial traveling wave heads of the three devices are respectively positioned, the time of the initial traveling wave heads reaching the devices is recorded, and the accurate position of a fault point is calculated according to 3 time quanta.
The traveling wave recording data is provided with absolute timestamp information of Beidou and GPS satellite time synchronization, the recording data of a plurality of devices can be synchronously analyzed through the information, and the recording waveforms with the same time dimension are checked; files are named according to the absolute time of the wave recording starting moment, so that the wave recording files of different devices can be conveniently retrieved and called, and the background system calls the waveform files of all the devices according to the file names to run a ranging algorithm.
After any two devices in the three devices are started, the background master station can calculate the position of a fault point by a double-end traveling wave method; if the three devices are all started, two devices with the closest fault starting time are selected, the wave recording waveform at the wave recording starting time is called, the waveform data is subjected to wavelet transformation, the absolute time of the fault initial traveling wave head reaching the two devices is accurately identified, and the double-end traveling wave method is used for ranging.
Example two
Referring to the attached drawing 1, the embodiment discloses a traveling wave fault positioning system of a high-speed railway traction power supply contact network, which includes:
the system comprises a space electromagnetic field traveling wave fault positioning device and a background analysis master station, wherein the space electromagnetic field traveling wave fault positioning device is respectively arranged below traction power supply upper network cables of a traction substation, an AT station and a subarea in a high-speed rail traction power supply system;
the space electromagnetic field traveling wave fault positioning device detects a contact network fault traveling wave signal in a mode of receiving a space electromagnetic field, the received fault traveling wave signal is processed to obtain an energy amplitude of the signal, when the energy amplitude of the voltage traveling wave signal exceeds a preset value, wave recording is started, a traveling wave waveform is recorded, and the recorded wave recording waveform is uploaded to a background analysis main station;
and after the background analysis main station receives the uploaded wave recording waveforms, the background analysis main station respectively positions the initial traveling wave head of the space electromagnetic field traveling wave fault positioning device, records the time of the initial traveling wave head reaching the space electromagnetic field traveling wave fault positioning device, and calculates the accurate position of a fault point according to the time quantum.
The fault locating device shown in fig. 2 detects a contact network fault traveling wave signal by receiving a space electromagnetic field.
And carrying out high-pass filtering on the received fault traveling wave signal, and then carrying out integral calculation to obtain the energy amplitude of the signal. And when the energy amplitude of the voltage traveling wave signal exceeds a preset value, starting wave recording and recording the traveling wave waveform. The traveling wave recording data is provided with absolute timestamp information of Beidou and GPS satellite time synchronization, the fault time is determined by detecting the time of an initial traveling wave head, and the file is named according to the absolute time of the fault time.
Uploading a waveform: and the recorded wave recording waveform is uploaded to the background analysis master station through the Internet of things mobile communication technology.
Fault positioning: after the background analysis master station receives the recorded wave waveforms uploaded by the 3 devices, the initial traveling wave heads of the three devices are respectively positioned, the time of the initial traveling wave heads reaching the devices is recorded, and the accurate position of a fault point is calculated according to 3 time quanta. In addition, after any two devices in the three devices are started, the background master station can calculate the position of a fault point by a double-end traveling wave method; if the three devices are all started, two devices with the closest fault time are selected to perform ranging by using a double-end traveling wave method.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. High-speed railway pulls power supply system traveling wave fault positioning system, characterized by includes:
the space electromagnetic field traveling wave fault locating device detects a contact network fault traveling wave signal in a space electromagnetic field receiving mode, the received fault traveling wave signal is processed to obtain an energy amplitude of the signal, when the energy amplitude of the voltage traveling wave signal exceeds a preset value, wave recording is started, a traveling wave waveform is recorded, and the recorded wave recording waveform is uploaded to the background analysis main station;
and after the background analysis main station receives the uploaded wave recording waveforms, the background analysis main station respectively positions the initial traveling wave head of the space electromagnetic field traveling wave fault positioning device, records the time of the initial traveling wave head reaching the space electromagnetic field traveling wave fault positioning device, and calculates the accurate position of a fault point according to the time quantum.
2. The traveling wave fault location system of the high-speed railway traction power supply system according to claim 1, wherein the power supply system of the space electromagnetic field traveling wave fault location device is composed of a solar panel, a super capacitor and a storage battery; the length of each power supply arm is about 20-30KM, and the distance between the devices is about 10-15 KM.
3. The traveling wave fault location system of the high-speed railway traction power supply system of claim 1, wherein after any two devices in the space electromagnetic field traveling wave fault location device are started, the background analysis master station calculates the position of the fault point by a double-end traveling wave method; if the three devices are all started, two devices with the closest fault time are selected to perform ranging by using a double-end traveling wave method.
4. The traveling wave fault location system of the high-speed railway traction power supply system according to claim 1, wherein the space electromagnetic field traveling wave fault location device is respectively installed below traction power supply network cables of a traction substation, an AT station and a subarea station in the high-speed railway traction power supply system.
5. The method for locating the traveling wave fault of the high-speed railway traction power supply system is characterized by comprising the following steps of:
collecting space traveling wave signals: detecting a contact network fault traveling wave signal in a mode of receiving a space electromagnetic field;
starting wave recording: processing the received fault traveling wave signal to obtain the energy amplitude of the signal, starting wave recording when the energy amplitude of the traveling wave signal exceeds a preset value, and recording the waveform of the traveling wave;
uploading a waveform: the recorded wave recording waveform is uploaded to a background analysis main station through the Internet of things mobile communication technology;
fault positioning: and after the background analysis main station receives the uploaded wave recording waveforms, respectively positioning the initial traveling wave heads, recording the time of the initial traveling wave heads reaching the device, and calculating the accurate position of the fault point according to the time quantum.
6. The traveling wave fault location method of the high-speed railway traction power supply system according to claim 5, wherein the space electromagnetic field traveling wave fault location device performs high-pass filtering on the received fault traveling wave signal, and then performs integral calculation to obtain the energy amplitude of the signal.
7. The traveling wave fault location method of the high-speed railway traction power supply system as claimed in claim 5, wherein the traveling wave waveform data carries absolute timestamp information of Beidou and GPS satellite time-setting, and is named as a file with an absolute time of a starting time.
8. The traveling wave fault location method of a high-speed railway traction power supply system according to claim 5, wherein the fault time of the fault point is determined by detecting the time of an initial traveling wave head.
9. The traveling wave fault location method of the high-speed railway traction power supply system according to claim 5, wherein the space electromagnetic field traveling wave fault location device is respectively installed below traction power supply network cables of a traction substation, an AT station and a subarea station in the high-speed railway traction power supply system.
10. The traveling wave fault location method of the high-speed railway traction power supply system according to claim 5, wherein after any two devices in the space electromagnetic field traveling wave fault location device are started, the background analysis master station calculates the position of the fault point by a double-end traveling wave method; if the three devices are all started, two devices with the closest fault time are selected to perform ranging by using a double-end traveling wave method.
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| CN112683151A (en) * | 2020-11-30 | 2021-04-20 | 中车长江车辆有限公司 | Power supply system, mobile device and method for positioning by using power supply network |
| CN112748309A (en) * | 2020-12-30 | 2021-05-04 | 中铁第一勘察设计院集团有限公司 | Railway power line traveling wave fault positioning device |
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Inventor after: Du Tao Inventor after: Guo Kai Inventor after: Wang Hanzhi Inventor after: Cui Xuetao Inventor after: Jin Yunchang Inventor after: Zhu Shaotu Inventor before: Du Tao Inventor before: Guo Kai Inventor before: Wang Hanzhi Inventor before: Cui Xuetao Inventor before: Jin Yunchang Inventor before: Zhu Shaotu Inventor before: Wang Desheng |