CN111551832B - Cable partial discharge high-precision positioning and noise removing method and device - Google Patents
Cable partial discharge high-precision positioning and noise removing method and device Download PDFInfo
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- CN111551832B CN111551832B CN202010485987.6A CN202010485987A CN111551832B CN 111551832 B CN111551832 B CN 111551832B CN 202010485987 A CN202010485987 A CN 202010485987A CN 111551832 B CN111551832 B CN 111551832B
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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
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06N—COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- G06N3/00—Computing arrangements based on biological models
- G06N3/02—Neural networks
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2218/00—Aspects of pattern recognition specially adapted for signal processing
- G06F2218/02—Preprocessing
- G06F2218/04—Denoising
- G06F2218/06—Denoising by applying a scale-space analysis, e.g. using wavelet analysis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- 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
- Y04S10/40—Display of information, e.g. of data or controls
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Abstract
The invention provides a cable partial discharge high-precision positioning and noise removing method and device, which comprise a shell and a display screen, wherein the top of the shell is provided with a mounting groove, the display screen is mounted in the mounting groove through a rotating shaft, the front side of the shell is provided with a circular groove I, the center position of the inner side wall of the circular groove I far away from an opening end is provided with a circular groove II, and a limiting slide bar is fixedly mounted between the inner side walls of the two sides of the circular groove II.
Description
Technical Field
The invention belongs to the technical field of cable partial discharge monitoring, and particularly relates to a high-precision positioning and noise removing method and device for cable partial discharge.
Background
The main detection means for the distribution cable at present are cable oscillation wave partial discharge detection and 0.1Hz ultralow frequency sine wave detection. Both means are off-line detection modes, can not reflect the degradation and faults of the cable in a short period, and can not record the aging process of the cable in real time. The main modes (optical fiber temperature measurement, joint partial discharge, ground circulation and the like) applied to the online monitoring of the high-voltage cable are limited to be inapplicable to large-scale popularization on the distribution cable, and the distribution cable lacks an economic and effective monitoring scheme.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a cable partial discharge high-precision positioning and noise removing method and device, which are reasonable in design, and provide a stable and efficient synchronization mechanism suitable for underground environments.
In order to achieve the above object, the present invention is realized by the following technical scheme: the utility model provides a cable partial discharge high accuracy location and noise remove device, includes shell and display screen, the mounting groove has been seted up at the top of shell, the display screen passes through the axis of rotation and installs in the mounting groove, circular slot one has been seted up to the front side of shell, circular slot two has been seted up to the central point department of the inside wall of keeping away from the open end in circular slot one, fixed mounting has spacing slide bar between the inside wall of circular slot two both sides, flexible groove has all been seted up to the both sides of circular slot two, the screw has been seted up on the inside wall of keeping away from the open end in flexible groove, the one end of screw rod passes the screw through external screw and internal thread cooperation and extends to the flexible inslot, the one end fixed mounting that the screw rod is in flexible inslot has the insulator spindle, arc metal splint is installed through the axis of rotation to the one end of insulator spindle, the through-hole has been seted up on the arc metal splint, arc metal splint is established on spacing slide bar through the through-hole cover, fixed mounting has the current transformer in the circular slot one, the open end of circular slot one is provided with the inclined plane.
As a preferred implementation mode of the invention, a processor and a storage battery are arranged in the shell, the processor is electrically connected with the current transformer, the storage battery is electrically connected with the processor through a power supply circuit, and the processor is electrically connected with the arc-shaped metal clamping plate through a communication circuit.
As a preferred embodiment of the present invention, one end of the screw is fixedly provided with a round handle.
As a preferred embodiment of the present invention, the number of the screw, the insulating rod and the arc-shaped metal clamping plate is 2.
A cable partial discharge high-precision positioning and noise removing method comprises the following steps:
step one: the mutual inductors at two ends are synchronous; the long-distance monitoring of the partial discharge of the middle-voltage cable is realized by adopting a measuring unit formed by installing high-frequency current transformers (11) at two ends of the cable, the time synchronization of the sensors at two ends is realized by utilizing the characteristic of a transmission line of a cable body, and the positioning is performed by the time difference of the partial discharge signal reaching the two current transformers (11);
step two: partial discharge monitoring is realized; firstly, realizing time synchronization and partial discharge positioning algorithm at two ends of a cable, wherein the required time precision is between 20ns and 40ns, the traditional GPS synchronization mode cannot meet the use requirement due to the signal shielding effect of the underground environment, a stable and efficient synchronization mechanism suitable for the underground environment needs to be developed, and a double-end communication mechanism taking the cable as a propagation channel is established at two ends of the cable and does not depend on the external environment, so that time synchronization and positioning are realized;
step three: noise removal and position location; and secondly, the sensitivity of signal detection is improved through a noise removing algorithm, a partial discharge high-frequency signal is easily submerged in background noise, the field noise types are researched according to the principles of different noise removing methods and the application conditions in scenes, the adaptability of different noise removing algorithms is analyzed, the noise types are divided into white noise and noise detected by an actual scene, and the position and intensity information of partial discharge is output in the background.
As a preferred embodiment of the present invention, the denoising method includes frequency band screening, wavelet analysis, hilbert-huang, time-frequency domain analysis, etc., and neural network method, and the noise type is combined to perform contrast analysis based on denoising.
The invention has the beneficial effects that: the invention relates to a cable partial discharge high-precision positioning and noise removing device which comprises a shell, a display screen, a mounting groove, a round groove I, a round groove II, a limiting slide bar, a telescopic groove, a screw rod, an insulating rod, an arc-shaped metal clamping plate, a current transformer, an inclined plane, a storage battery and a round handle.
1. The cable partial discharge high-precision positioning and noise removing method provides a stable and efficient synchronization mechanism suitable for underground environments, and aims to establish a double-end communication mechanism which takes a cable as a propagation channel at two ends of the cable and does not depend on an external environment, so that time synchronization and positioning are realized, and positioning precision is improved.
2. The cable partial discharge high-precision positioning and noise removing method is used for measuring typical noise in a line, comparing and analyzing the methods by combining noise types, specifically designing a denoising algorithm, improving denoising efficiency, and finally outputting partial discharge position and intensity information in the background, so that effective monitoring of a distribution cable with higher fault rate is realized, and the safety of a distribution network is ensured.
3. This cable partial discharge high accuracy location and noise remove device can effectually improve the efficiency of use, when using, directly inserts the current transformer in the circular slot one with the cable, then extend to in the circular slot two, the arc metal splint of reuse is fixed can, just can accomplish communication and detection, convenient and fast.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a cable partial discharge high precision positioning and noise removal device;
FIG. 2 is a schematic cross-sectional view of a cable partial discharge high precision positioning and noise removal device;
FIG. 3 is a schematic illustration of a method for high precision positioning and noise removal of partial discharge of a cable;
FIG. 4 is a flow chart of the steps of a method for high precision positioning and noise removal of partial discharge of a cable;
in the figure: 1. a housing; 2. a display screen; 3. a mounting groove; 4. a round groove I; 5. a round groove II; 6. a limit slide bar; 7. a telescopic slot; 8. a screw; 9. an insulating rod; 10. arc metal splints; 11. a current transformer; 12. an inclined plane; 13. a storage battery; 14. a round handle.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 4, the present invention provides a technical solution: the utility model provides a cable partial discharge high accuracy location and noise remove device, includes shell 1 and display screen 2, mounting groove 3 has been seted up at the top of shell 1, display screen 2 passes through the axis of rotation and installs in mounting groove 3, round slot one 4 has been seted up to the front side of shell 1, round slot two 5 have been seted up to the central point department of the inside wall that open end was kept away from to round slot one 4, fixed mounting has spacing slide bar 6 between the inside wall of round slot two 5 both sides, telescopic slot 7 has all been seted up to the both sides of round slot two 5, the screw has been seted up on the inside wall that open end was kept away from to telescopic slot 7, screw 8's one end passes the screw through external screw and internal screw thread cooperation and extends to telescopic slot 7 in, screw 8 is in telescopic slot 7's one end fixed mounting has insulator spindle 9, arc metal splint 10 are installed through the axis of rotation to one end of insulator spindle 9, the through-hole has been seted up on the arc metal splint 10, arc metal splint 10 is established on spacing slide bar 6 through the through-hole cover, fixed mounting has current transformer 11 in round slot one 4, the open end 12 of 4 has a slope 12.
As a preferred embodiment of the present invention, a processor and a storage battery 13 are installed in the housing 1, the processor is electrically connected with the current transformer 11, the storage battery 13 is electrically connected with the processor through a power supply circuit, and the processor is electrically connected with the arc-shaped metal clamping plate 10 through a communication circuit.
As a preferred embodiment of the present invention, a round handle 14 is fixedly installed at one end of the screw 8.
As a preferred embodiment of the present invention, the number of the screw rod 8, the insulating rod 9 and the arc-shaped metal clamping plate 10 is 2.
A cable partial discharge high-precision positioning and noise removing method comprises the following steps:
step one: the mutual inductors at two ends are synchronous; the long-distance monitoring of the partial discharge of the middle-voltage cable is realized by adopting a measuring unit formed by installing high-frequency current transformers 11 at two ends of the cable, the time synchronization of the sensors at two ends is realized by utilizing the characteristic of a transmission line of a cable body, and the positioning is performed by the time difference of the partial discharge signal reaching the two current transformers 11;
step two: partial discharge monitoring is realized; firstly, realizing time synchronization and partial discharge positioning algorithm at two ends of a cable, wherein the required time precision is about 20ns to 40ns, for example, 30ns, the traditional GPS synchronization mode cannot meet the use requirement due to the signal shielding effect of the underground environment, a stable and efficient synchronization mechanism suitable for the underground environment needs to be developed, and a double-end communication mechanism taking the cable as a propagation channel and not depending on the external environment is established at two ends of the cable, so that time synchronization and positioning are realized;
step three: noise removal and position location; secondly, the sensitivity of signal detection is improved through a noise removing algorithm, a partial discharge high-frequency signal is easily submerged in background noise, the adaptability of different noise removing algorithms is analyzed according to the principles of different noise removing methods and application conditions in scenes, the noise types are divided into white noise and noise detected in actual scenes, the current mainstream noise removing methods comprise frequency band screening, wavelet analysis, hilbert-huang, time-frequency domain analysis and the like, neural networks and the like, the methods are combined for comparison analysis, and finally, the position and intensity information of partial discharge are output in the background.
As a preferred implementation mode of the invention, the cable partial discharge high-precision positioning and noise removing device can effectively improve the use efficiency, when in use, the cable is directly inserted into the current transformer 11 in the circular groove I4 and then extends into the circular groove II 5, then the screw rod 8 and the insulating rod 9 are rotated by the circular handle 14 to fix the two arc-shaped metal clamping plates 10, communication and detection can be completed, the current transformer 11 is responsible for receiving partial discharge signals at fault positions and transmitting the partial discharge signals to the processor, and the processor sends and receives communication signals through the communication circuit and the arc-shaped metal clamping plates 10, so that the device is convenient and quick.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (4)
1. The utility model provides a cable partial discharge high accuracy location and noise remove device, includes shell (1) and display screen (2), its characterized in that, mounting groove (3) have been seted up at the top of shell (1), display screen (2) are installed in mounting groove (3) through the axis of rotation, circular slot one (4) have been seted up to the front side of shell (1), circular slot two (5) have been seted up in the central point department of the inside wall of open end was kept away from to circular slot one (4), fixed mounting has spacing slide bar (6) between the inside wall of circular slot two (5) both sides, flexible groove (7) have all been seted up on the both sides of circular slot two (5), set up the screw on the inside wall that the open end was kept away from in flexible groove (7), screw rod (8) one end pass the screw through external screw and internal thread cooperation and extend to in flexible groove (7), one end fixed mounting insulator spindle (9) in flexible groove (7), arc metal splint (10) have been installed through the axis of rotation to one end of insulating spindle (4), metal splint (10) have a fixed through-hole (10) on arc slide bar (4) are established in arc through-shaped through-hole (4), an inclined plane (12) is arranged at the opening end of the round groove I (4).
2. The apparatus for high precision positioning and noise removal of partial discharge of a cable according to claim 1, wherein: the novel intelligent electric energy meter is characterized in that a processor and a storage battery (13) are arranged in the shell (1), the processor is electrically connected with the current transformer (11), the storage battery (13) is electrically connected with the processor through a power supply circuit, and the processor is electrically connected with the arc-shaped metal clamping plate (10) through a communication circuit.
3. The apparatus for high precision positioning and noise removal of partial discharge of a cable according to claim 1, wherein: one end of the screw rod (8) is fixedly provided with a round handle (14).
4. The apparatus for high precision positioning and noise removal of partial discharge of a cable according to claim 1, wherein: the number of the screw rods (8), the insulating rods (9) and the arc-shaped metal clamping plates (10) is 2.
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| CN202010485987.6A CN111551832B (en) | 2020-06-01 | 2020-06-01 | Cable partial discharge high-precision positioning and noise removing method and device |
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| CN202010485987.6A CN111551832B (en) | 2020-06-01 | 2020-06-01 | Cable partial discharge high-precision positioning and noise removing method and device |
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| CN111551832B true CN111551832B (en) | 2023-06-02 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112130033B (en) * | 2020-08-25 | 2023-08-01 | 广西电网有限责任公司南宁供电局 | Cable partial discharge noise signal detection device |
| CN112595937B (en) * | 2020-11-20 | 2024-07-05 | 沈阳达能电安全高新产业技术研究院有限公司 | Cable partial discharge measuring device based on balance method |
| CN113466606A (en) * | 2021-05-12 | 2021-10-01 | 国网浙江省电力有限公司绍兴供电公司 | Cable fault positioning system and method based on voiceprint recognition |
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