CN112748309A - Railway power line traveling wave fault positioning device - Google Patents
Railway power line traveling wave fault positioning device Download PDFInfo
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention relates to a railway power line traveling wave fault positioning device, which comprises a magnetic-sensitive detection component, a magnetic-sensitive detection unit and a control unit, wherein the magnetic-sensitive detection component is used for generating a magnetic-sensitive detection signal according to the magnetic field intensity of the position of the magnetic-sensitive detection component relative to a railway power line; and the traveling wave positioning component is connected with the magnetic-sensitive detection component and used for acquiring traveling wave signals in the railway power line according to the magnetic-sensitive detection signals and positioning the fault of the railway power line according to the traveling wave signals. Through the technical scheme, the problem of waveform distortion of the traveling wave signal caused by magnetic saturation of the ferromagnetic traveling wave sensor is solved, direct connection with primary equipment is not needed, and the anti-interference capability and reliability of the traveling wave fault positioning device of the railway power line are improved.
Description
Technical Field
The utility model relates to a railway power line technical field especially relates to a railway power line travelling wave fault locating device.
Background
In the whole electrified railway, a railway power line is an important task for directly supplying electric energy obtained from traction power transformation to an electric locomotive, is a key point of good current collection and safe operation of the electric locomotive, and directly influences the transportation of the electrified railway. Railway power lines are exposed outdoors in severe environment for a long time and are subjected to mechanical impact of an electric bow of an electric locomotive, faults easily occur, serious damage is caused to electric equipment, and railway driving safety is affected.
The fault of the railway power line can be positioned by adopting a traveling wave method, the traveling wave in the railway power line can be detected by adopting a ferromagnetic traveling wave sensor or a Rogowski coil traveling wave sensor at present, but the ferromagnetic traveling wave sensor has magnetic saturation, so that the waveform distortion of a traveling wave signal is caused, and the positioning precision of the fault traveling wave of the railway power line is influenced. The Rogowski coil traveling wave sensor has to extract traveling wave signals from primary equipment, and has high insulation requirements, complex electromagnetic environment and difficult power taking.
Disclosure of Invention
In order to solve the technical problem or at least partially solve the technical problem, the present disclosure provides a railway power line traveling wave fault location device, which solves the problem of waveform distortion of a traveling wave signal due to magnetic saturation of a ferromagnetic traveling wave sensor, and improves the anti-interference capability and reliability of the railway power line traveling wave fault location device without being directly connected to primary equipment.
The utility model provides a railway power line travelling wave fault locating device, include:
the magnetic-sensing detection component is used for generating a magnetic-sensing detection signal according to the magnetic field intensity of the position of the magnetic-sensing detection component relative to the railway power line;
and the traveling wave positioning component is connected with the magnetic-sensitive detection component and used for acquiring traveling wave signals in the railway power line according to the magnetic-sensitive detection signals and positioning the fault of the railway power line according to the traveling wave signals.
Optionally, the magnetically sensitive detection component comprises a giant magnetoresistance detection component.
Optionally, the method further comprises:
a preamplifier corresponding to at least one direction of a magnetic field at a position of the magnetic-sensitive detection unit with respect to the railway power line, wherein the magnetic-sensitive detection unit is connected to the traveling-wave positioning unit via the preamplifier, and the preamplifier amplifies the magnetic-sensitive detection signal corresponding to the magnetic field direction by a set factor and outputs the amplified signal.
Optionally, the pre-stage amplification unit includes:
the reverse input end of the preamplifier is connected with the magnetic-sensing detection signal corresponding to the magnetic field direction through a first impedance element, and the reverse input end of the preamplifier is connected with the output end of the pre-inverter through a second impedance element.
Optionally, a ratio of resistance values of the second impedance element to the first impedance element is greater than or equal to 20 and less than or equal to 60.
Optionally, the method further comprises:
the filter circuit corresponds to at least one direction of the magnetic field of the position of the magnetic sensitive detection component relative to the railway power line, the magnetic sensitive detection component is connected with the traveling wave positioning component through the filter circuit, and the filter circuit is used for filtering interference signals which exceed a set frequency range in the magnetic sensitive detection signals corresponding to the magnetic field direction.
Optionally, the filter circuit comprises:
the low-pass filter circuit is used for filtering interference signals which are greater than or equal to a first set frequency in the magnetic-sensitive detection signals corresponding to the magnetic field direction;
the high-pass filter circuit is used for filtering interference signals which are less than or equal to a second set frequency in the magnetic-sensitive detection signals corresponding to the magnetic field direction; wherein the second set frequency is less than the first set frequency.
Optionally, the low-pass filter circuit comprises a third impedance element and a first capacitor, and the high-pass filter circuit comprises a fourth impedance element and a second capacitor;
the first end of the third impedance element is connected to the magnetic-sensing detection signal corresponding to the magnetic field direction, the second end of the third impedance element is connected to the first end of the first capacitor and the first end of the second capacitor, the second end of the second capacitor is connected to the first end of the fourth impedance element and serves as the output end of the filter circuit, and the second end of the first capacitor and the second end of the fourth impedance element are connected to a set power supply signal.
Optionally, the first set frequency is greater than or equal to 10MHZ and less than or equal to 50MHZ, and the second set frequency is greater than or equal to 5KHZ and less than or equal to 100 KHZ.
Optionally, the method further comprises:
the magnetic-sensitive detection device comprises a pre-amplification part and a filter circuit, wherein the pre-amplification part corresponds to at least one direction of a magnetic field of the position of the magnetic-sensitive detection part relative to the railway power line, the magnetic-sensitive detection part is connected with the traveling wave positioning part through the pre-amplification part and the filter circuit, the pre-amplification part is used for amplifying the magnetic-sensitive detection signal corresponding to the magnetic field direction by a set multiple and outputting the amplified magnetic-sensitive detection signal, and the filter circuit is used for filtering an interference signal which exceeds a set frequency range in the amplified magnetic-sensitive detection signal corresponding to the magnetic field direction.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the disclosed embodiment provides a railway power line traveling wave fault positioning device, which comprises a magnetic-sensitive detection part and a traveling wave positioning part, wherein the traveling wave positioning part is connected with the magnetic-sensitive detection part, the magnetic-sensitive detection part is used for generating a magnetic-sensitive detection signal according to the magnetic field intensity of the position of the magnetic-sensitive detection part relative to a railway power line, the traveling wave positioning part is used for acquiring a traveling wave signal in the railway power line according to the magnetic-sensitive detection signal and positioning the fault of the railway power line according to the traveling wave signal, the problem of waveform distortion of the traveling wave signal due to magnetic saturation of a ferromagnetic traveling wave sensor can be solved by utilizing the non-magnetic saturation characteristic of the magnetic-sensitive detection part, the traveling wave signal can be sensed in a non-contact mode by utilizing the magnetic-sensitive detection part without being directly connected with primary equipment, and the anti-interference capability and reliability of the railway power line traveling wave fault positioning device are improved, the problems that a Rogowski coil type traveling wave sensor has high insulation requirement, complex electromagnetic environment and difficult power taking because a traveling wave signal must be extracted from primary equipment are solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a traveling wave fault locating device for a railway power line according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram illustrating a principle of traveling wave detection performed by a magnetic sensing detection component according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another railway power line traveling wave fault location device provided in the embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a pre-stage amplifying part according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of another railway power line traveling wave fault location device provided in the embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a filter circuit according to an embodiment of the disclosure;
fig. 7 is a schematic structural diagram of another railway power line traveling wave fault location device according to an embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
Fig. 1 is a schematic structural diagram of a railway power line traveling wave fault locating device provided in an embodiment of the present disclosure. As shown in fig. 1, the traveling wave fault location device for the railway power line comprises a magnetic-sensitive detection component 1 and a traveling wave location component 2, wherein the magnetic-sensitive detection component 1 is connected with the traveling wave location component 2, the magnetic-sensitive detection component 1 is used for generating a magnetic-sensitive detection signal according to the magnetic field intensity of the position of the magnetic-sensitive detection component 1 relative to the railway power line, and the traveling wave location component 2 is used for acquiring a traveling wave signal in the railway power line according to the magnetic-sensitive detection signal and locating the fault of the railway power line according to the traveling wave signal.
Fig. 2 is a schematic diagram illustrating a principle of traveling wave detection performed by a magnetic sensing detection component according to an embodiment of the present disclosure. With reference to fig. 1 and 2, it can be known through electromagnetic analysis that when a traveling wave current flows through a railway power line a, i.e., a conductor, a nanosecond transient rotating magnetic field centered on the conductor is generated around the railway power line a, in fig. 2, inward and outward indication portions represent the nanosecond transient rotating magnetic field, and the magnitude of the magnetic field intensity at a certain point near the railway power line a is proportional to the magnitude of the traveling wave current on the railway power line a and inversely proportional to the vertical distance from the point to a bus.
When the magnetic-sensing detection component 1 is used for detecting the magnetic field intensity, the magnetic-sensing detection component 1 is placed at a position which is away from a railway power line A by a certain distance and is not contacted with the railway power line, the magnetic-sensing detection component 1 can detect the magnetic field intensity generated by a traveling wave signal nearby the railway power line A, for example, the magnetic field intensity of the magnetic-sensing detection component 1 relative to the position of the railway power line is detected, the magnetic-sensing detection component 1 generates a magnetic-sensing detection signal according to the detected magnetic field intensity, and transmits the magnetic-sensing detection signal corresponding to the magnetic field intensity to the traveling wave positioning component 2. The traveling wave positioning component 2 receives the magnetic-sensitive detection signal output by the magnetic-sensitive detection component 1, acquires a traveling wave signal in the railway power line according to the magnetic-sensitive detection signal, and performs fault positioning of the railway power line according to the traveling wave signal, namely, the traveling wave acquisition component reversely obtains the traveling wave signal in the railway power line according to the magnetic-sensitive detection signal, so that the traveling wave signal is accurately acquired, fault positioning of the railway power line is performed according to the traveling wave signal, and the safety and reliability of railway operation are improved.
For example, the magnetic-sensing detection component 1 may be configured to detect magnetic fields in three directions included in a magnetic field at a position of the magnetic-sensing detection component 1 relative to the railway power line, for example, the magnetic fields in three directions X, Y and Z in a vertical coordinate system, and the traveling wave positioning component 2 may collect traveling wave signals in the railway power line according to three magnetic-sensing detection signals corresponding to different magnetic field directions, so as to improve accuracy of fault positioning of the railway power line according to the traveling wave signals. Illustratively, the magnetic sensing component 1 may include a Giant Magneto Resistance (Giant Magneto Resistance) detecting component, and the Giant Magneto Resistance (Giant Magneto Resistance) detecting component has a higher magnetic field detection sensitivity to further improve the accuracy of positioning the traveling wave signal, thereby improving the safety and reliability of the railway operation.
At present, a ferromagnetic traveling wave sensor or a Rogowski coil traveling wave sensor can be used for detecting traveling waves in a railway power line, the ferromagnetic traveling wave sensor adopts a high-frequency iron core as a magnetic conductive material, the traveling wave sensor is manufactured by utilizing the electromagnetic induction principle, the Rogowski coil traveling wave sensor adopts a Rogowski coil to acquire traveling wave signals, and a corresponding integral unit is matched to analyze high-frequency traveling waves. However, the ferromagnetic traveling wave sensor has magnetic saturation, which causes waveform distortion of the traveling wave signal and affects the positioning accuracy of the fault traveling wave of the railway power line. The Rogowski coil traveling wave sensor has to extract traveling wave signals from primary equipment, and has high insulation requirements, complex electromagnetic environment and difficult power taking.
The embodiment of the disclosure utilizes the magnetism-free saturation characteristic of the magnetic-sensing detection component 1, such as a giant magnetoresistance detection component, and utilizes the magnetic-sensing detection component 1 to sensitively sense the traveling wave signal in the railway electric power line near the high-voltage current carrier. The traveling wave signal pulse current generates a pulse magnetic field, and the pulse magnetic field is sensed within a certain range from the railway power line through the magnetic-sensitive detection component 1, so that the non-contact detection of the traveling wave signal can be realized. The magnetic-sensing detection component 1 has the characteristics of wide magnetic field bandwidth range and no magnetic saturation, can realize the nondestructive detection of the traveling wave signal of the railway power line, can solve the problem of waveform distortion of the traveling wave signal caused by the magnetic saturation of the ferromagnetic traveling wave sensor, can sense the traveling wave magnetic field nearby the railway power line by utilizing the magnetic-sensing detection component 1, realizes the sensing of the traveling wave signal in a non-contact mode, does not need to be directly connected with primary equipment, improves the anti-interference capability and reliability of the traveling wave fault positioning device of the railway power line, and solves the problems that the traveling wave signal is required to be extracted from the primary equipment, the insulation requirement is high, the electromagnetic environment is complex, and the electricity taking is difficult.
Fig. 3 is a schematic structural diagram of another railway power line traveling wave fault location device according to an embodiment of the present disclosure. In addition to the above-described embodiments, as shown in fig. 3, the railway power line traveling wave fault location device may further include a preamplifier 3 corresponding to at least one direction of a magnetic field at a position of the magneto-sensitive detection unit 1 with respect to the railway power line, the magneto-sensitive detection unit 1 is connected to the traveling wave location unit 2 through the preamplifier 3, and the preamplifier 3 is configured to amplify a magneto-sensitive detection signal corresponding to the magnetic field direction by a set multiple and output the amplified signal.
For example, the magnetic sensing detecting component 1 may be configured to detect three directions of magnetic fields included in the magnetic field at the position of the magnetic sensing detecting component 1 relative to the railway power line, for example, X, Y and Z directions perpendicular to each other may be detected, and corresponding magnetic sensing detecting components 1 may output magnetic sensing detecting signals corresponding to the magnetic fields in different directions through three ports x, y and Z, respectively. It is possible to provide the railway electric power line traveling wave fault location device further including a preamplifier section 3 corresponding to at least one direction of the magnetic field of the position where the magnetism-sensitive detection section 1 is located with respect to the railway electric power line, and fig. 3 exemplarily provides the railway electric power line traveling wave fault location device further including preamplifier sections 3 corresponding to three directions of the magnetic field of the position where the magnetism-sensitive detection section 1 is located with respect to the railway electric power line.
Specifically, the magnetic-sensitive detection signal corresponding to the magnetic field direction generated by the magnetic-sensitive detection component 1 is output to the corresponding pre-amplification component 3, and the pre-amplification component 3 amplifies the magnetic-sensitive detection signal corresponding to the magnetic field direction by a set multiple and outputs the amplified signal to the traveling wave positioning component 2, so that the small magnetic-sensitive detection signal corresponding to the magnetic field direction output by the magnetic-sensitive detection component 1 is amplified, and the traveling wave signal is favorably acquired by the traveling wave positioning component 2.
Fig. 4 is a schematic structural diagram of a pre-stage amplifying unit according to an embodiment of the present disclosure. With reference to fig. 3 and 4, it may be provided that the preamplifier section 3 includes a preamplifier, an inverting input terminal of which is connected to the magnetic-sensitive detection signal corresponding to the magnetic field direction through a first impedance element R1, and an inverting input terminal of which is connected to an output terminal of the pre-inverter through a second impedance element R2.
Specifically, a reverse input terminal of a preamplifier is connected to a magnetic sensitive detection signal corresponding to a magnetic field direction through a first impedance element R1, the reverse input terminal of the preamplifier is connected to an output terminal of a pre-inverter through a second impedance element R2, the pre-amplifier forms a reverse amplifier, and a voltage value of a magnetic sensitive detection signal Vin corresponding to the magnetic field direction connected to the pre-amplifier is VinFor example, the voltage value V of the amplified magnetic-sensing detection signal Vout output by the preamplifieroutThe following calculation formula is satisfied:
wherein R is1Is a resistance value of the first impedance element R1, R2The resistance value of the second impedance element R2 is adjusted by adjusting the resistance value of the first impedance element R1 and the resistance value of the second impedance element R2, so that the preamplifier can be adjusted to realize different amplification factors, and the processing of the magnetic-sensing detection signal corresponding to the magnetic field direction with different amplification factors can be realized.
Alternatively, the ratio of the resistance values of the second resistance element R2 to the first resistance element R1 may be set to 20 or more and 60 or less, and preferably, the ratio of the resistance values of the second resistance element R2 to the first resistance element R1 may be set to 50, for example, the resistance value of the second resistance element R2 may be set to 50 kilohms and the resistance value of the first resistance element R1 may be set to 1 kilohms. Illustratively, the synchronism between different pre-stage amplification sections 3 and between multiple channels of the same pre-stage amplification section 3 itself may be set within 20ns, that is, the signal transmission time deviation is 20ns or less.
Fig. 5 is a schematic structural diagram of another railway power line traveling wave fault location device according to an embodiment of the present disclosure. On the basis of the above embodiment, as shown in fig. 5, the traveling wave fault location device for a railway power line may further include a filter circuit 4 corresponding to at least one direction of a magnetic field of a position of the magneto-sensitive detection component 1 relative to the railway power line, where the magneto-sensitive detection component 1 is connected to the traveling wave location component 2 through the filter circuit 4, and the filter circuit 4 is configured to filter an interference signal exceeding a set frequency range in a magneto-sensitive detection signal corresponding to the magnetic field direction.
Exemplarily, the magnetic sensing detection component 1 may output magnetic sensing detection signals corresponding to magnetic fields in different directions through three ports x, y, and z, the railway power line traveling wave fault location device may further include a filter circuit 4 corresponding to at least one direction of the magnetic field at the position of the magnetic sensing detection component 1 relative to the railway power line, fig. 5 exemplarily sets the railway power line traveling wave fault location device further including a filter circuit 4 corresponding to three directions of the magnetic field at the position of the magnetic sensing detection component 1 relative to the railway power line, and the filter circuit 4 is configured to filter an interference signal exceeding a set frequency range in the magnetic sensing detection signal corresponding to the magnetic field direction.
Optionally, the filter circuit may include a low-pass filter circuit and a high-pass filter circuit, the low-pass filter circuit is configured to filter an interference signal greater than or equal to a first set frequency in the magnetic-sensing detection signal corresponding to the magnetic field direction, and the high-pass filter circuit is configured to filter an interference signal less than or equal to a second set frequency in the magnetic-sensing detection signal corresponding to the magnetic field direction; wherein, the second setting frequency is less than the first setting frequency.
Specifically, the problem of collecting traveling wave signals in a railway power line in a non-contact sensitive manner is solved by adopting the magnetic sensitive detection component 1, such as a GMR chip, but the problem of false start of a railway power line traveling wave fault positioning device is often caused by the influence of interference signals, the fault is reported by mistake by the railway power line traveling wave fault positioning device, and the adverse effect is brought to the operation and maintenance work of the railway power line.
The filter circuit comprises a low-pass filter circuit and a high-pass filter circuit, the low-pass filter circuit is used for filtering an interference signal which is greater than or equal to a first set frequency in a magnetic-sensitive detection signal corresponding to a magnetic field direction, the high-pass filter circuit is used for filtering an interference signal which is less than or equal to a second set frequency in the magnetic-sensitive detection signal corresponding to the magnetic field direction, the second set frequency is less than the first set frequency, the magnetic-sensitive detection signal which corresponds to the magnetic field direction can be effectively filtered, the interference signal which is greater than or equal to the first set frequency and less than or equal to the second set frequency is avoided, false start of a railway electric power line traveling wave fault positioning device caused by the interference signal is avoided, the railway electric power line traveling wave fault positioning device misreports faults, and adverse effects are brought to operation and maintenance work.
Illustratively, the first set frequency is set to be 10MHz or more and 50MHz or less, and the second set frequency is set to be 5KHZ or more and 100KHZ or less. Specifically, the process of sensing the traveling wave signal by the magnetic sensing detection unit 1, for example, the GMR detection unit, is mainly affected by interference of the power frequency magnetic field, magnetic field interference generated by partial discharge of the transformer, and magnetic field distribution change interference caused by passing vehicles. The frequency of the interference signals is mainly distributed below 5kHz and above 50MHz, the common frequency band of the power grid fault traveling wave signals is mainly 100kHz-10MHz, therefore, a first set frequency is set to be more than or equal to 10MHz, less than or equal to 50MHz, a second set frequency is more than or equal to 5KHZ, less than or equal to 100KHZ, the interference signals with the frequency more than 10MHz can be effectively filtered, the interference signals with the frequency more than 50MHz and the interference signals with the frequency less than 100KHZ can be effectively filtered, the interference signals with the frequency less than 5KHZ can be ensured to be filtered, namely, a band-pass frequency-selecting filter circuit consisting of a low-pass filter circuit and a high-pass filter circuit is utilized, and the extraction of the fault effective traveling wave signals is realized.
Fig. 6 is a schematic structural diagram of a filter circuit according to an embodiment of the disclosure. With reference to fig. 5 and 6, it may be arranged that the low-pass filter circuit 41 includes a third impedance element R3 and a first capacitor C1, the high-pass filter circuit 42 includes a fourth impedance element R4 and a second capacitor C2, a first end of the third impedance element R3 is connected to the magnetic sensing detection signal corresponding to the magnetic field direction, a second end of the third impedance element R3 is connected to a first end of the first capacitor C1 and a first end of the second capacitor C2, respectively, a second end of the second capacitor C2 is connected to a first end of the fourth impedance element R4 and serves as an output end of the filter circuit 4, and a second end of the first capacitor C1 and a second end of the fourth impedance element R4 are connected to a set power signal, such as a ground signal.
Specifically, the low-pass filter circuit 41 includes a third impedance element R3 and a first capacitor C1, the high-pass filter circuit 42 includes a fourth impedance element R4 and a second capacitor C2, an upper cutoff frequency of the high-pass filter circuit 42 is smaller than a lower cutoff frequency of the low-pass filter circuit 41, a frequency range of the band-pass filter is the lower cutoff frequency of the low-pass filter circuit 41 and the upper cutoff frequency of the high-pass filter circuit 42, and a low-pass filter cutoff frequency fc1The following calculation formula is satisfied:
high pass filter cut-off frequency fc2The following calculation formula is satisfied:
wherein R is3Is a resistance value of the third impedance element R3, R4Is a resistance value, C, of the fourth impedance element R41Is the capacitance value of the first capacitor C1, C2Is the capacitance value of the second capacitor C2. Illustratively, the low-pass filtering cut-off frequency can be set to be 50MHz, and the high-frequency filtering cut-off frequency can be set to be 5kHz, so that the requirement of effective traveling wave signal extraction can be met, and the isolation of the sensor-end interference signal can be realized.
Fig. 7 is a schematic structural diagram of another railway power line traveling wave fault location device according to an embodiment of the present disclosure. In addition to the above-mentioned embodiments, as shown in fig. 7, the apparatus for locating a traveling wave fault of a railway power line may further include a preamplifier 3 and a filter circuit 4 corresponding to at least one direction of a magnetic field at a position of the magneto-sensitive detection unit 1 with respect to the railway power line, the magneto-sensitive detection unit 1 is connected to the traveling wave locating unit 2 through the preamplifier 3 and the filter circuit 4, the preamplifier 3 is configured to amplify a magneto-sensitive detection signal corresponding to the magnetic field direction by a set multiple and output the amplified magneto-sensitive detection signal, and the filter circuit 4 is configured to filter an interference signal exceeding a set frequency range from the amplified magneto-sensitive detection signal corresponding to the magnetic field direction.
Illustratively, the magneto-dependent detecting part 1 can output magneto-dependent detecting signals corresponding to magnetic fields in different directions through three ports x, y and z, the railway power line travelling wave fault locating device can be configured to further comprise a pre-amplifying part 3 and a filter circuit 4 corresponding to at least one direction of the magnetic field of the position of the magneto-dependent detecting part 1 relative to the railway power line, and fig. 7 exemplarily configures the railway power line travelling wave fault locating device to further comprise a pre-amplifying part 3 and a filter circuit 4 corresponding to three directions of the magnetic field of the position of the magneto-dependent detecting part 1 relative to the railway power line.
Specifically, the magnetic-sensing detection part 1 generates a magnetic-sensing detection signal and outputs the magnetic-sensing detection signal to the preceding-stage amplification part 3, the preceding-stage amplification part 3 amplifies the magnetic-sensing detection signal corresponding to the magnetic field direction by a set multiple and outputs the magnetic-sensing detection signal to the corresponding filter circuit 4, and the filter circuit 4 is used for filtering an interference signal which exceeds a set frequency range in the amplified magnetic-sensing detection signal corresponding to the magnetic field direction, so that the smaller magnetic-sensing detection signal corresponding to the magnetic field direction output by the magnetic-sensing detection part 1 is amplified, the collection of the traveling wave signal by the traveling wave positioning part 2 is facilitated, meanwhile, the interference signal which is larger than or equal to a first set frequency and smaller than or equal to a second set frequency in the amplified magnetic-sensing detection signal corresponding to the magnetic field direction can be effectively filtered, the false start of the traveling wave fault positioning device of the railway power line caused by the interference signal is avoided, and the, the problem of bad influence is brought to the operation and maintenance work of railway power line. Similarly, the pre-stage amplification unit 3 and the filter circuit 4 can be implemented by using the specific circuits implemented in the above embodiments.
Illustratively, as shown in fig. 7, the traveling wave fault locating device of the railway power line can be arranged to further comprise a power supply loop, and the magnetic-sensing detection part 1 acquires a power supply signal from the traveling wave locating part 2 through the amplifier 1.
The embodiment of the disclosure can solve the problem of waveform distortion of traveling wave signals caused by magnetic saturation of ferromagnetic traveling wave sensors by using the non-magnetic saturation characteristic of the magnetic-sensitive detection component, can sense the traveling wave signals in a non-contact mode by using the magnetic-sensitive detection component without being directly connected with primary equipment, improves the anti-interference capability and reliability of the traveling wave fault positioning device of the railway power line, and solves the problems that the traveling wave signals must be extracted from the primary equipment, the insulation requirement is high, the electromagnetic environment is complex and the electricity taking is difficult in the Rogowski coil type traveling wave sensors.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A railway power line traveling wave fault locating device, comprising:
the magnetic-sensing detection component is used for generating a magnetic-sensing detection signal according to the magnetic field intensity of the position of the magnetic-sensing detection component relative to the railway power line;
and the traveling wave positioning component is connected with the magnetic-sensitive detection component and used for acquiring traveling wave signals in the railway power line according to the magnetic-sensitive detection signals and positioning the fault of the railway power line according to the traveling wave signals.
2. The traveling wave fault locating device according to claim 1, wherein said magneto-sensitive detecting means comprises giant magneto-resistive detecting means.
3. The railway power line traveling wave fault locating device of claim 1, further comprising:
a preamplifier corresponding to at least one direction of a magnetic field at a position of the magnetic-sensitive detection unit with respect to the railway power line, wherein the magnetic-sensitive detection unit is connected to the traveling-wave positioning unit via the preamplifier, and the preamplifier amplifies the magnetic-sensitive detection signal corresponding to the magnetic field direction by a set factor and outputs the amplified signal.
4. The traveling wave fault locating device according to claim 3, wherein said pre-stage amplifying means includes:
the reverse input end of the preamplifier is connected with the magnetic-sensing detection signal corresponding to the magnetic field direction through a first impedance element, and the reverse input end of the preamplifier is connected with the output end of the pre-inverter through a second impedance element.
5. The traveling wave fault locating device according to claim 4, wherein a ratio of the resistance values of said second impedance element to said first impedance element is equal to or greater than 20 and equal to or less than 60.
6. The railway power line traveling wave fault locating device of claim 1, further comprising:
the filter circuit corresponds to at least one direction of the magnetic field of the position of the magnetic sensitive detection component relative to the railway power line, the magnetic sensitive detection component is connected with the traveling wave positioning component through the filter circuit, and the filter circuit is used for filtering interference signals which exceed a set frequency range in the magnetic sensitive detection signals corresponding to the magnetic field direction.
7. The railway power line traveling wave fault locating device of claim 6, wherein the filter circuit comprises:
the low-pass filter circuit is used for filtering interference signals which are greater than or equal to a first set frequency in the magnetic-sensitive detection signals corresponding to the magnetic field direction;
the high-pass filter circuit is used for filtering interference signals which are less than or equal to a second set frequency in the magnetic-sensitive detection signals corresponding to the magnetic field direction; wherein the second set frequency is less than the first set frequency.
8. The railway power line traveling wave fault locating device of claim 7, wherein the low pass filter circuit comprises a third impedance element and a first capacitance, and the high pass filter circuit comprises a fourth impedance element and a second capacitance;
the first end of the third impedance element is connected to the magnetic-sensing detection signal corresponding to the magnetic field direction, the second end of the third impedance element is connected to the first end of the first capacitor and the first end of the second capacitor, the second end of the second capacitor is connected to the first end of the fourth impedance element and serves as the output end of the filter circuit, and the second end of the first capacitor and the second end of the fourth impedance element are connected to a set power supply signal.
9. The traveling wave fault location device according to claim 7, wherein the first set frequency is 10MHZ or higher and 50MHZ or lower, and the second set frequency is 5KHZ or higher and 100KHZ or lower.
10. The railway power line traveling wave fault locating device of claim 1, further comprising:
the magnetic-sensitive detection device comprises a pre-amplification part and a filter circuit, wherein the pre-amplification part corresponds to at least one direction of a magnetic field of the position of the magnetic-sensitive detection part relative to the railway power line, the magnetic-sensitive detection part is connected with the traveling wave positioning part through the pre-amplification part and the filter circuit, the pre-amplification part is used for amplifying the magnetic-sensitive detection signal corresponding to the magnetic field direction by a set multiple and outputting the amplified magnetic-sensitive detection signal, and the filter circuit is used for filtering an interference signal which exceeds a set frequency range in the amplified magnetic-sensitive detection signal corresponding to the magnetic field direction.
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| CN202011611381.9A CN112748309A (en) | 2020-12-30 | 2020-12-30 | Railway power line traveling wave fault positioning device |
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| CN202011611381.9A CN112748309A (en) | 2020-12-30 | 2020-12-30 | Railway power line traveling wave fault positioning device |
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| CN113495232A (en) * | 2021-09-08 | 2021-10-12 | 中国人民解放军国防科技大学 | Traveling wave magnetic field fault detection method, device, equipment, storage medium and system |
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