CN109946572B - Partial discharge signal direction finding method and system based on circular ultrahigh frequency sensor array - Google Patents
Partial discharge signal direction finding method and system based on circular ultrahigh frequency sensor array Download PDFInfo
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Abstract
The invention discloses a partial discharge signal direction finding method based on a circular ultrahigh frequency sensor array, which comprises the following steps: uniformly arranging a plurality of ultrahigh frequency sensors on the circumference of a circle to form a circular ultrahigh frequency sensor array; the ultrahigh frequency sensors are adopted to receive ultrahigh frequency partial discharge signals simultaneously; searching an extreme value in the received ultrahigh frequency partial discharge signal; and judging the direction of the ultrahigh frequency partial discharge signal through the angle of the ultrahigh frequency sensor which acquires the extreme value. In addition, the invention also discloses a partial discharge signal direction-finding system based on the circular ultrahigh frequency sensor array, which comprises: the system comprises a circular ultrahigh frequency sensor array of a plurality of ultrahigh frequency sensors uniformly distributed on the circumference of a circle and a signal acquisition and processing device in data connection with the ultrahigh frequency sensors. The local discharge signal direction finding method accurately and quickly obtains the position of the local discharge signal through a simple and easy-to-implement mode.
Description
Technical Field
The present invention relates to a direction finding method and system, and more particularly, to a direction finding method and system for partial discharge signals.
Background
In the power industry, the state detection and diagnosis of the power equipment can improve the maintenance efficiency, effectively discover potential hidden dangers of the equipment, discover power faults in time and further effectively avoid major accidents.
At present, partial discharge is one of the important reasons for equipment failure, in recent years, monitoring and positioning of spatial partial discharge of an open-type substation are paid certain attention and research, an existing ultrahigh-frequency partial discharge spatial positioning technology is mainly based on electromagnetic wave arrival time difference, however, a method in the prior art requires very high time synchronization precision and sampling rate, and the requirement on hardware is extremely high.
Based on this, it is desirable to improve a local discharge signal direction finding method with less hardware requirement, which is easier to implement.
Disclosure of Invention
One of the objectives of the present invention is to provide a local discharge signal direction finding method based on a circular uhf sensor array, which accurately and quickly obtains the position where a local discharge signal occurs through a simple and easy-to-implement manner, so as to find out the position where a power failure occurs in time. In addition, the partial discharge signal direction finding method has low requirement on hardware, high orientation precision and good application prospect.
Based on the purpose, the invention provides a partial discharge signal direction finding method based on a circular ultrahigh frequency sensor array, which comprises the following steps:
uniformly arranging a plurality of ultrahigh frequency sensors on the circumference of a circle to form a circular ultrahigh frequency sensor array;
the ultrahigh frequency sensors are adopted to receive ultrahigh frequency partial discharge signals simultaneously;
searching an extreme value in the received ultrahigh frequency partial discharge signal;
and judging the direction of the ultrahigh frequency partial discharge signal through the angle of the ultrahigh frequency sensor which acquires the extreme value.
The inventor of the present invention finds, through a great deal of experimental research and analysis, that if a sensor can rotate 360 ° to receive a partial discharge signal, it can determine the orientation of the partial discharge signal by comparing extreme values (maximum or minimum) of signal intensity values, due to an electric field shielding effect, the received signal intensity value is the largest when the partial discharge signal is facing the sensor, and the partial discharge signal backs on the received signal intensity value of the sensor, that is, when the signal intensity value is the maximum, the partial discharge signal is facing the sensor, and when the signal intensity value is the minimum, the partial discharge signal backs on the sensor. However, the sensor is specially manufactured into a rotatable structure, so that the manufacturing cost is too high, the rotation of the sensor needs time, and the partial discharge time is extremely short, so that the sensor cannot be realized in the practical process.
Based on this, the inventor skillfully proposes that a plurality of ultrahigh frequency sensors are uniformly distributed on the circumference of a circle to form a circular ultrahigh frequency sensor array. Therefore, when partial discharge occurs, each ultrahigh frequency sensor in the circular ultrahigh frequency sensor array can receive the ultrahigh frequency partial discharge signal, and the extreme value of the signal intensity value obtained by processing the signal intensity values of all the received ultrahigh frequency partial discharge signals can be used for judging the position of the ultrahigh frequency partial discharge signal relative to the circular ultrahigh frequency sensor array.
The partial discharge signal direction-finding method based on the circular ultrahigh frequency sensor array accurately and quickly obtains the position of the ultrahigh frequency partial discharge signal through a simple and easy-to-implement mode, so that the position of the power failure is found out in time, and the method has low requirement on hardware, higher orientation precision and better application prospect.
Furthermore, in the partial discharge signal direction finding method based on the circular ultrahigh frequency sensor array, at least four ultrahigh frequency sensors are uniformly distributed on the circumference of a circle.
Further, in the partial discharge signal direction finding method based on the circular ultrahigh frequency sensor array, the minimum value in the received ultrahigh frequency partial discharge signals is searched, and the back direction corresponding to the angle of the ultrahigh frequency sensor which acquires the minimum value is the direction of the ultrahigh frequency partial discharge signals.
In view of the fact that the manufacturing specifications of each ultrahigh frequency sensor are the same, and the gradient near the minimum value is large, and the searching is easy, in the technical scheme of the invention, the searching for the minimum value of the ultrahigh frequency partial discharge signal is preferably adopted.
Further, in the partial discharge signal direction finding method based on the circular ultrahigh frequency sensor array, the ultrahigh frequency sensor is provided with a monopole PCB antenna, and the monopole PCB antenna is packaged in the shell of the ultrahigh frequency sensor.
Further, in the partial discharge signal direction finding method based on the circular ultrahigh frequency sensor array, the part of the shell, which is opposite to the monopole PCB antenna, is made of a material which can be penetrated by electromagnetic signals, and the rest part of the shell is made of a metal material.
Accordingly, another object of the present invention is to provide a partial discharge signal direction-finding system based on a circular uhf sensor array, which can find the direction of the partial discharge signal simply, quickly and effectively.
Based on the above purpose, the present invention provides a partial discharge signal direction-finding system based on a circular ultrahigh frequency sensor array, which includes:
the circular ultrahigh frequency sensor array comprises a plurality of ultrahigh frequency sensors which are uniformly distributed on the circumference of a circle;
the signal acquisition and processing device is in data connection with each ultrahigh frequency sensor;
the ultrahigh frequency sensors receive ultrahigh frequency partial discharge signals simultaneously; the signal acquisition and processing device receives a plurality of ultrahigh frequency partial discharge signals acquired by a plurality of ultrahigh frequency sensors, searches an extreme value from the ultrahigh frequency partial discharge signals, and judges the direction of the ultrahigh frequency partial discharge signals according to the angle of the ultrahigh frequency sensor acquiring the extreme value.
Furthermore, in the partial discharge signal direction-finding system based on the circular ultrahigh frequency sensor array, at least four ultrahigh frequency sensors are uniformly distributed on the circumference of a circle.
Furthermore, in the partial discharge signal direction-finding system based on the circular ultrahigh frequency sensor array, the signal acquisition and processing device searches for the minimum value in the received ultrahigh frequency partial discharge signals, and determines the back direction corresponding to the angle of the ultrahigh frequency sensor acquiring the minimum value as the direction of the ultrahigh frequency partial discharge signals.
Further, in the partial discharge signal direction finding system based on the circular uhf sensor array according to the present invention, the uhf sensor has a monopole PCB antenna, and the monopole PCB antenna is encapsulated in the casing of the uhf sensor.
Further, in the partial discharge signal direction-finding system based on the circular ultrahigh frequency sensor array, the part of the shell, which is opposite to the monopole PCB antenna, is made of a material which can transmit electromagnetic signals, and the rest part of the shell is made of a metal material.
The partial discharge signal direction-finding method and the system based on the circular ultrahigh frequency sensor array have the advantages and beneficial effects as follows:
the method for measuring the direction of the partial discharge signal based on the circular ultrahigh frequency sensor array comprises the steps of forming a circular ultrahigh frequency sensor array by a plurality of ultrahigh frequency sensors for receiving ultrahigh frequency partial discharge signals, receiving the ultrahigh frequency partial discharge signals in a plurality of directions simultaneously by utilizing the circular ultrahigh frequency sensor array, processing and analyzing the collected ultrahigh frequency partial discharge signals, and searching an extreme value in the ultrahigh frequency partial discharge signals so as to directly judge the direction of the ultrahigh frequency partial discharge signals and locate the partial discharge generating source.
The local discharge signal direction-finding method is ingenious in conception, solves the problems in the prior art through a simple and easy-to-implement mode, does not need a special sensor with high manufacturing cost, has extremely low hardware requirement, and can well realize high-precision orientation of the local discharge signal.
Drawings
Fig. 1 is a schematic structural diagram of a partial discharge signal direction-finding system based on a circular uhf sensor array according to some embodiments of the present invention.
Fig. 2 schematically shows, from a certain angle, the structure of the uhf sensor in some embodiments of the partial discharge signal direction-finding system based on the circular uhf sensor array according to the present invention.
Fig. 3 schematically shows the structure of the uhf sensor in some embodiments of the partial discharge signal direction-finding system based on the circular uhf sensor array according to the present invention from another perspective.
Fig. 4 schematically shows the structure of a monopole PCB antenna of the partial discharge signal direction-finding system based on a circular uhf sensor array according to some embodiments of the present invention.
Fig. 5 schematically shows the ultrahigh frequency partial discharge signal collected by the partial discharge signal direction-finding system based on the circular ultrahigh frequency sensor array according to the present invention in some embodiments.
Fig. 6 is a schematic flow chart of a partial discharge signal direction finding method based on a circular uhf sensor array according to some embodiments of the present invention.
Detailed Description
The partial discharge signal direction finding method and system based on the circular uhf sensor array according to the present invention will be further described with reference to the following specific embodiments and the attached drawings, but the description should not be construed as an inappropriate limitation to the technical solution of the present invention.
Fig. 1 is a schematic structural diagram of a partial discharge signal direction-finding system based on a circular uhf sensor array according to some embodiments of the present invention.
As shown in FIG. 1, the partial discharge signal direction-finding system based on the circular UHF sensor array comprises N UHF sensors S uniformly arranged on the circumference of a circle1、S2、S3…SNAnd a signal acquisition and processing device in data connection with each ultrahigh frequency sensor.
Further reference may be made to fig. 2 to 3 regarding the specific structure of the uhf sensor. Fig. 2 schematically shows, from a certain angle, the structure of the uhf sensor in some embodiments of the partial discharge signal direction-finding system based on the circular uhf sensor array according to the present invention. Fig. 3 schematically shows the structure of the uhf sensor in some embodiments of the partial discharge signal direction-finding system based on the circular uhf sensor array according to the present invention from another perspective.
As shown in fig. 2 and 3, the uhf sensor is provided with a signal processing circuit on the skin of the housing (space shown at a in fig. 2), and a monopole PCB antenna is packaged inside the housing (space shown at B in fig. 3) opposite to the skin. The part of the shell opposite to the monopole PCB antenna is made of a material which can penetrate through electromagnetic signals, and the rest part of the shell is made of a metal material.
Fig. 4 schematically shows the structure of a monopole PCB antenna of the partial discharge signal direction-finding system based on a circular uhf sensor array according to some embodiments of the present invention.
As shown in fig. 4, the monopole PCB antenna includes a wiring board D and a metal antenna C.
The working principle of the partial discharge signal direction-finding system based on the circular ultrahigh frequency sensor array is explained with reference to fig. 1 to 4:
n UHF sensors S in a circular UHF sensor array when partial discharges occur1、S2、S3…SNAnd receiving the ultrahigh frequency partial discharge signal, processing the received ultrahigh frequency partial discharge signal by a signal processing circuit to obtain N signal values, and transmitting the N signal values to a signal acquisition and processing device through data connection. The signal acquisition and processing device finds an extreme value from the N signal values, and judges the direction of the ultrahigh frequency partial discharge signal according to the angle of the ultrahigh frequency sensor acquiring the extreme value.
In the above scheme, the value of N may be set according to the specific situation of the implementation, and the larger the value of N is, the higher the accuracy of the orientation is.
Considering the directional resolution and the spatial layout, it is preferable that at least four uhf sensors are uniformly distributed on the circumference of a circle.
When the circular uhf sensor array is provided with four uhf sensors, i.e., N ═ 4. For convenience of explanation, any one of four uniformly distributed ultrahigh frequency sensors is taken as an origin, and the sensors are sequentially named as ultrahigh frequency sensors I, II, III and IV in a clockwise direction, so that the angle of the ultrahigh frequency sensor I is 0 °, the angle of the ultrahigh frequency sensor II is 90 °, the angle of the ultrahigh frequency sensor III is 180 °, and the angle of the ultrahigh frequency sensor IV is 270 °. When partial discharge occurs in different directions, the ultrahigh frequency partial discharge signals collected by the ultrahigh frequency sensors I, II, III, IV can refer to fig. 5.
Fig. 5 schematically shows the ultrahigh frequency partial discharge signal acquired by the partial discharge signal system based on the circular ultrahigh frequency sensor array according to the present invention in some embodiments.
As shown in fig. 5, the vertical axis represents the signal strength received by each uhf sensor, and the horizontal axis represents the positioning angle, which is the included angle between the connection line between the signal source generating the partial discharge signal and the center of the circular uhf sensor array and the connection line between the uhf sensor I and the center of the circular uhf sensor array.
As can be seen from fig. 5, when the positioning angle is 90 °, the uhf sensor II receives the largest signal intensity value, and the uhf sensor IV receives the smallest signal intensity value. This means that when the signal intensity value is maximum, the signal source generating the partial discharge signal is opposite to the ultrahigh frequency sensor, and when the signal intensity value is minimum, the signal source generating the partial discharge signal is opposite to the sensor. Considering that each vhf sensor is made in the same specification, and the gradient near the minimum value is large, it is easy to find, so it is preferable to find the minimum value of the vhf partial discharge signal.
Fig. 6 is a schematic flow chart of a partial discharge signal direction finding method based on a circular uhf sensor array according to some embodiments of the present invention.
As shown in fig. 6, the partial discharge signal direction finding method based on the circular uhf sensor array includes the steps of:
uniformly arranging a plurality of ultrahigh frequency sensors on the circumference of a circle to form a circular ultrahigh frequency sensor array;
the ultrahigh frequency sensors are adopted to receive ultrahigh frequency partial discharge signals simultaneously.
And searching for an extreme value in the received ultrahigh frequency partial discharge signal.
And judging the direction of the ultrahigh frequency partial discharge signal through the angle of the ultrahigh frequency sensor which acquires the extreme value.
In summary, it can be seen that, in the local discharge signal direction finding method and system based on the circular uhf sensor array, a plurality of uhf sensors for receiving the uhf local discharge signals form a circular uhf sensor array, the circular uhf sensor array can be used for receiving the uhf local discharge signals in a plurality of directions at the same time, the collected uhf local discharge signals are processed and analyzed, and an extreme value is found, so that the direction of the uhf local discharge signals can be directly judged, and a local discharge generation source is located.
In addition, the local discharge signal direction-finding method and the system have ingenious conception, solve the problems in the prior art through a simple and easy-to-implement mode, do not need a special sensor with high manufacturing cost, have extremely low hardware requirement and can well realize the high-precision orientation of the local discharge signal.
It should be noted that the prior art in the protection scope of the present invention is not limited to the examples given in the present application, and all the prior art which is not inconsistent with the technical scheme of the present invention, including but not limited to the prior patent documents, the prior publications and the like, can be included in the protection scope of the present invention.
It should be noted that the combination of the features in the present application is not limited to the combination described in the claims or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradictory to each other.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (8)
1. A partial discharge signal direction finding method based on a circular ultrahigh frequency sensor array is characterized by comprising the following steps:
uniformly arranging a plurality of ultrahigh frequency sensors on the circumference of a circle to form a circular ultrahigh frequency sensor array;
the ultrahigh frequency sensors are adopted to receive ultrahigh frequency partial discharge signals simultaneously;
searching an extreme value in the received ultrahigh frequency partial discharge signal;
judging the direction of the ultrahigh frequency partial discharge signal through the angle of the ultrahigh frequency sensor which acquires the extreme value; and searching the minimum value in the received ultrahigh frequency partial discharge signals, wherein the back corresponding to the angle of the ultrahigh frequency sensor which acquires the minimum value is the direction of the ultrahigh frequency partial discharge signals.
2. The method according to claim 1, wherein at least four uhf sensors are uniformly arranged on the circumference of a circle.
3. The partial discharge signal direction finding method based on the circular uhf sensor array of claim 1, wherein the uhf sensor has a monopole PCB antenna, which is enclosed within a housing of the uhf sensor.
4. The partial discharge signal direction finding method based on the circular uhf sensor array of claim 3, wherein the portion of the housing facing the monopole PCB antenna is made of a material that can transmit electromagnetic signals, and the rest of the housing is made of a metal material.
5. A partial discharge signal direction-finding system based on a circular ultrahigh frequency sensor array is characterized by comprising:
the circular ultrahigh frequency sensor array comprises a plurality of ultrahigh frequency sensors which are uniformly distributed on the circumference of a circle;
the signal acquisition and processing device is in data connection with each ultrahigh frequency sensor;
the ultrahigh frequency sensors receive ultrahigh frequency partial discharge signals simultaneously; the signal acquisition and processing device receives a plurality of ultrahigh frequency partial discharge signals acquired by a plurality of ultrahigh frequency sensors, searches for an extreme value from the ultrahigh frequency partial discharge signals, and judges the direction of the ultrahigh frequency partial discharge signals according to the angle of the ultrahigh frequency sensor acquiring the extreme value;
the signal acquisition and processing device searches for the minimum value in the received ultrahigh frequency partial discharge signals and judges the back corresponding to the angle of the ultrahigh frequency sensor acquiring the minimum value as the direction of the ultrahigh frequency partial discharge signals.
6. The partial discharge signal direction-finding system based on the circular uhf sensor array of claim 5, wherein at least four uhf sensors are uniformly arranged on the circumference of a circle.
7. The partial discharge signal direction finding system based on a circular uhf sensor array of claim 5, wherein the uhf sensor has a monopole PCB antenna that is enclosed within a housing of the uhf sensor.
8. The partial discharge signal direction-finding system based on the circular uhf sensor array of claim 7, wherein the portion of the housing facing the monopole PCB antenna is made of a material that can transmit electromagnetic signals, and the rest of the housing is made of a metal material.
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| CN113589116B (en) * | 2021-08-11 | 2024-06-04 | 山东通广电子股份有限公司 | Method and system for detecting partial discharge position |
| CN116165599B (en) * | 2023-04-24 | 2023-06-27 | 武汉能钠智能装备技术股份有限公司四川省成都市分公司 | Ultrashort wave direction finding system and integrated ultrashort wave direction finding equipment |
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| CN102967807A (en) * | 2012-11-10 | 2013-03-13 | 西安交通大学 | Insulation defect locating method |
| KR101574613B1 (en) * | 2015-05-27 | 2015-12-11 | 지투파워(주) | A detection and diagnosis system with remote configuration function for partial discharge by detecting UHF electrical signal |
| CN106556783A (en) * | 2016-12-05 | 2017-04-05 | 西安交通大学 | A kind of shelf depreciation direction-finding method in transformer station based on superfrequency phased array principle |
| CN107085171A (en) * | 2017-04-01 | 2017-08-22 | 西安交通大学 | A kind of optimization placement method of superfrequency phased array for transformer station's shelf depreciation direction finding |
| CN108181557A (en) * | 2017-12-29 | 2018-06-19 | 上海交通大学 | A kind of method in determining ultrahigh frequency partial discharge signal orientation |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967807A (en) * | 2012-11-10 | 2013-03-13 | 西安交通大学 | Insulation defect locating method |
| KR101574613B1 (en) * | 2015-05-27 | 2015-12-11 | 지투파워(주) | A detection and diagnosis system with remote configuration function for partial discharge by detecting UHF electrical signal |
| CN106556783A (en) * | 2016-12-05 | 2017-04-05 | 西安交通大学 | A kind of shelf depreciation direction-finding method in transformer station based on superfrequency phased array principle |
| CN107085171A (en) * | 2017-04-01 | 2017-08-22 | 西安交通大学 | A kind of optimization placement method of superfrequency phased array for transformer station's shelf depreciation direction finding |
| CN108181557A (en) * | 2017-12-29 | 2018-06-19 | 上海交通大学 | A kind of method in determining ultrahigh frequency partial discharge signal orientation |
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