Portable solar-blind ultraviolet discharge directional device and method

Abstract

Disclosed are a portable day-blind ultraviolet discharge orientation device and method. In the portable day-blind ultraviolet discharge orientation device, an ultraviolet optical lens module collects ultraviolet pulse signals of insulation discharge outside power equipment, a day-blind SiC sparse pixel array is arranged at the rear end of the ultraviolet optical lens module to generate multi-channel electrical pulse signals based on the ultraviolet light pulse signals, a multi-channel peak holding unit is connected to the day-blind SiC sparse pixel array to generate a detection voltage signal based on the multi-channel electrical pulse signals, a multi-channel ADC sampling and counting unit is connected to the multi-channel peak holding unit to generate a partial discharge pulse peak based on the detection voltage signal, a positioning unit is connected to the multi-channel ADC sampling and counting unit, and generates a grid node position based on the partial discharge pulse peak, a visible light imaging module collects visible light video images of insulation discharge outside power equipment, and a central processing unit is connected to the visible light imaging module and the positioning unit to fuse the grid node position and the visible light video image.

Description

Technical Field

[0001] The invention belongs to the technical field of switch cabinet equipment detection, and in particular relates to a portable solar-blind ultraviolet discharge directional device and method. Background Art

[0002] Abnormal discharge of external insulation of power equipment is a typical precursor to insulation failure. For example, surface discharge of line insulators, floating potential, abnormal corona of cable terminals or joints, partial discharge inside switchgear, sparks or arcs in motor windings are all important hidden dangers that cause insulation failure of lines or equipment and even threaten the safety of power systems.

[0003] Solar-blind ultraviolet imagers are a common technical means for the above-mentioned abnormal discharge of external insulation. Their advantage is that they can visually inspect the external insulation of lines and equipment. However, such instruments are generally composed of solar-blind ultraviolet filter lenses, fluorescent microchannel plates, ultraviolet CCD or CMOS image arrays, visible light camera modules and image display systems. Their sophisticated and complex optoelectronic system structure determines that their volume and weight are difficult to reduce, and they are not convenient to carry. They are also expensive and difficult to be widely promoted and equipped by everyone in the power equipment operation and inspection departments. For the vast majority of distribution lines and equipment, the main purpose of ultraviolet discharge imaging is to find the location of the discharge source and fault analysis, while the detailed information of the ultraviolet spot obtained by the ultraviolet imager plays a relatively limited role in the inspection work, and is even redundant. Therefore, ultraviolet detection, which takes positioning and diagnosis as the core goals, is more practical than ultraviolet imaging, and the cost of implementation will be greatly reduced, which is conducive to carrying and promotion.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a portable solar-blind ultraviolet discharge orientation device and method, which utilizes a new generation of SiC ultraviolet solar-blind array and sparse element grid positioning as well as a visible light imaging module and a phase statistical spectrum to achieve the positioning of external insulation discharge, so as to solve the practical problem of accurate positioning of partial discharge optical detection. The positioning method is more practical than ultraviolet imaging, and the implementation cost will be greatly reduced, which is conducive to carrying and promotion. In order to achieve the above purpose, the present invention provides the following technical solutions:

[0006] A portable solar-blind ultraviolet discharge directional device of the present invention comprises:

[0007] Ultraviolet optical lens module, which collects ultraviolet pulse signals of insulation discharge outside power equipment;

[0008] A solar-blind SiC sparse pixel array, which is arranged at the rear end of the ultraviolet optical lens module to generate a multi-channel electrical pulse signal based on the ultraviolet light pulse signal;

[0009] A multi-channel peak holding unit connected to the solar-blind SiC sparse pixel array to generate a detection voltage signal based on the multi-channel electrical pulse signal, wherein the number of channels of the multi-channel peak holding unit is not less than the number of pixel units of the solar-blind SiC sparse pixel array;

[0010] A multi-channel ADC sampling and counting unit, which is connected to the multi-channel peak holding unit to generate a partial discharge pulse peak value based on the detection voltage signal, and the number of channels of the multi-channel ADC sampling and counting unit is not less than the number of pixel units of the solar-blind SiC sparse pixel array;

[0011] A positioning unit connected to the multi-channel ADC sampling and counting unit, which generates a grid node position based on a peak value of a partial discharge pulse;

[0012] A visible light imaging module that collects visible light video images of insulation discharge outside the power equipment. The visible light imaging module and the ultraviolet optical lens module are arranged adjacent to each other so that the distance between the adjacent edges of the two does not exceed 2 cm.

[0013] A central processing unit is connected to the visible light imaging module and the positioning unit to fuse the grid node positions and the visible light video image.

[0014] In the portable solar-blind ultraviolet discharge orientation device, the numerical aperture of the ultraviolet optical lens module is consistent with the numerical aperture of the visible light imaging lens of the front section of the visible light imaging module.

[0015] In the portable solar-blind ultraviolet discharge orientation device, the transmittance of the ultraviolet optical lens module from the ultraviolet band to the visible light band is not less than 85%.

[0016] In the portable solar-blind ultraviolet discharge directional device, the solar-blind SiC sparse pixel array is a square array, the pixel unit size is not less than 0.5 mm×0.5 mm, the number of pixel units is not less than 10×10, the quantum efficiency of each pixel unit is not less than 30%, and the primary photoelectric gain is not less than 10 5 A / lm, dynamic range not less than 20dB.

[0017] In the portable solar-blind ultraviolet discharge directional device, the multi-channel peak holding unit includes an IU conversion unit, a voltage following unit, a signal amplification and frequency reduction detection unit.

[0018] In the portable solar-blind ultraviolet discharge orientation device, the signal amplification gain of the multi-channel peak holding unit is not less than 50dB, and the center frequency of the down-conversion detection output signal is not higher than 0.5MHz.

[0019] In the portable solar-blind ultraviolet discharge directional device, the partial discharge pulse peak value includes the pulse peak value within the integration time, and the multi-channel ADC sampling counting unit converts the pulse peak value within the integration time into a relative photon count per unit time.

[0020] In the portable solar-blind ultraviolet discharge orientation device, the visible optical imaging module includes a front-end visible light imaging lens and a visible light CCD array.

[0021] In the portable day-blind ultraviolet discharge directional device, the relative photon count per unit time obtained by the multi-channel ADC sampling and counting unit is used to perform periodic photon quantity statistics according to the voltage power frequency cycle, and the phase of a power frequency cycle is divided into equally spaced windows, and the relative photon number in each window is plotted to form a pseudo-phase statistical spectrum.

[0022] A positioning method based on the portable solar-blind ultraviolet discharge orientation device comprises the following steps:

[0023] The ultraviolet optical lens module collects ultraviolet pulse signals of insulation discharge outside the power equipment, the solar-blind SiC sparse pixel array generates a multi-channel electrical pulse signal based on the ultraviolet pulse signal, the multi-channel peak holding unit is connected to the solar-blind SiC sparse pixel array to generate a detection voltage signal based on the multi-channel electrical pulse signal, and the multi-channel ADC sampling counting unit is connected to the multi-channel peak holding unit to generate a partial discharge pulse peak based on the detection voltage signal and convert it into a relative number of photons received per unit time S ij ,

[0024] The positioning unit is connected to the multi-channel ADC sampling counting unit, which generates a grid node position based on the peak value of the partial discharge pulse, wherein the optical field of view is grid-divided according to the number of pixel units m×m of the solar-blind SiC sparse pixel array, the corresponding number of grids is m×m, and the variables i and j are used to represent the row index and column index in the solar-blind SiC sparse pixel array, respectively, and the grid node is recorded as n ij , i = 1: m-1, j = 1: m-1, and calculate the relative number of photons S received per unit time in each grid ij , i = 1: m, j = 1: m; calculate the relative number of photons per unit time S in the four adjacent grid areas of each grid node ij ; S i,j+1 ; S i+1,j ; S i+1,j+1 The variance D ij; Calculate the variance D within the same integration time ij The minimum value min(D ij ), and record S xy =min(D ij ), the corresponding grid node is the discharge location,

[0025] The visible light imaging module collects visible light video images of insulation discharge outside the power equipment, and the grid node positions are superimposed on the visible light video images within the corresponding integration time for fusion.

[0026] In the positioning method, the unit time is less than 1 / 24 second.

[0027] In the above technical scheme, a portable day-blind ultraviolet discharge orientation device and method provided by the present invention have the following beneficial effects: the portable day-blind ultraviolet discharge orientation device greatly reduces the device cost, volume and weight of day-blind ultraviolet discharge visualization detection; adds a pseudo-phase tracking statistical function to generate a phase statistical spectrum to provide a basis for fault type judgment; expands the application scenarios of ultraviolet visualization detection technology, and has a good prospect for integrated application with mobile phones, smart terminals, robots and drones. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a connection schematic diagram of an embodiment of the portable solar-blind ultraviolet discharge directional device of the present invention;

[0030] Figure 2 A schematic diagram of a flow chart of positioning calculation of an embodiment of a portable solar-blind ultraviolet discharge orientation device in the present invention;

[0031] Figure 3 A schematic diagram of grid segmentation of an embodiment of a portable solar-blind ultraviolet discharge directional device of the present invention;

[0032] Figure 4 A schematic diagram of the optical path of ultraviolet imaging of an embodiment of the portable solar-blind ultraviolet discharge directional device of the present invention;

[0033] Figure 5 A schematic diagram of a SiC diode array of an embodiment of a portable solar-blind ultraviolet discharge directional device of the present invention;

[0034] Figure 6A schematic diagram of a pseudo-phase statistical spectrum of an embodiment of a portable solar-blind ultraviolet discharge directional device of the present invention;

[0035] Figure 7 This is a schematic diagram of the execution results of the positioning algorithm of an embodiment of the portable solar-blind ultraviolet discharge orientation device of the present invention;

[0036] Figure 8 This is a schematic diagram of the field of view superposition of ultraviolet positioning of an embodiment of the portable solar-blind ultraviolet discharge orientation device in the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the following will be combined with the attached embodiments of the present invention. Figures 1 to 8 , clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] In order to enable those skilled in the art to better understand the technical solution of the present invention, Figures 1 to 8 As shown,

[0045] The portable solar-blind ultraviolet discharge directional device includes:

[0046] The UV optical lens module collects the UV pulse signal of the insulation discharge outside the power equipment.

[0047] A solar-blind SiC sparse pixel array is provided at the rear end of the ultraviolet optical lens module to generate a multi-channel electrical pulse signal based on the ultraviolet light pulse signal.

[0048] A multi-channel peak holding unit connected to the solar-blind SiC sparse pixel array to generate a detection voltage signal based on the multi-channel electrical pulse signal, wherein the number of channels of the multi-channel peak holding unit is not less than the number of pixel units of the solar-blind SiC sparse pixel array,

[0049] a multi-channel ADC sampling and counting unit connected to the multi-channel peak holding unit to generate a partial discharge pulse peak value based on the detection voltage signal, wherein the number of channels of the multi-channel ADC sampling and counting unit is not less than the number of pixel units of the solar-blind SiC sparse pixel array,

[0050] A positioning unit connected to the multi-channel ADC sampling counting unit generates a grid node position based on a peak value of a partial discharge pulse,

[0051] The visible light imaging module collects visible light video images of insulation discharge outside the power equipment. The visible light imaging module and the ultraviolet optical lens module are arranged adjacent to each other so that the distance between the adjacent edges of the two does not exceed 2 cm.

[0052] A central processing unit is connected to the visible light imaging module and the positioning unit to fuse the grid node positions and the visible light video image.

[0053] In a preferred embodiment of the portable solar-blind ultraviolet discharge directional device, the numerical aperture of the ultraviolet optical lens module is consistent with the numerical aperture of the visible light imaging lens of the front section of the visible light imaging module.

[0054] In a preferred embodiment of the portable solar-blind ultraviolet discharge directional device, the transmittance of the ultraviolet optical lens module from the ultraviolet band to the visible light band is not less than 85%.

[0055] In a preferred embodiment of the portable solar-blind ultraviolet discharge directional device, the solar-blind SiC sparse pixel array is a square array, the pixel unit size is not less than 0.5 mm × 0.5 mm, the number of pixel units is not less than 10 × 10, the quantum efficiency of each pixel unit is not less than 30%, and the primary photoelectric gain is not less than 10 5 A / lm, dynamic range not less than 20dB.

[0056] In a preferred embodiment of the portable solar-blind ultraviolet discharge directional device, the multi-channel peak holding unit includes an IU conversion unit, a voltage follower unit, a signal amplification and frequency reduction detection unit.

[0057] In a preferred embodiment of the portable solar-blind ultraviolet discharge orientation device, the signal amplification gain of the multi-channel peak holding unit is not less than 50dB, and the center frequency of the down-conversion detection output signal is not higher than 0.5MHz.

[0058] In a preferred embodiment of the portable solar-blind ultraviolet discharge directional device, the partial discharge pulse peak value includes the pulse peak value within the integration time, and the multi-channel ADC sampling counting unit converts the pulse peak value within the integration time into a relative photon count per unit time.

[0059] In a preferred embodiment of the portable solar-blind ultraviolet discharge orientation device, the visible optical imaging module includes a front-end visible light imaging lens and a visible light CCD array.

[0060] In one embodiment, Figure 2 As shown, the central processing unit executes the sparse element grid positioning judgment algorithm to calculate the grid node position of the discharge ultraviolet light source and fuse it with the visible light video for display; the sparse element grid positioning judgment algorithm includes:

[0061] 1) According to the number of SiC pixels (m×m), the optical field of view is divided into grids, the corresponding number of grids is m×m, and the variables i and j represent the row index and column index in the solar-blind SiC sparse pixel array respectively, and the grid node is recorded as n ij (i=1:m-1, j=1:m-1), and calculate the relative number of photons received per unit time in each grid area (SiC pixel unit), recorded as S ij (i=1:m, j=1:m);

[0062] 2) Calculate the relative number of photons per unit time in the four adjacent grid areas of each grid node (S ij ; S i,j+1 ; S i+1,j ; S i+1,j+1 ) ij ,like Figure 3 As shown;

[0063] 3) Calculate D within the same integration time ij The minimum value min(D ij ), and record S xy =min(D ij ), corresponding grid node n xy That is the discharge positioning position, and the position is superimposed on the visible light video image within the corresponding integration time; the execution time of the main logic of the sparse element grid positioning judgment algorithm and the positioning position display time are less than 1 / 24 second to match the video stream display frame number.

[0064] In one embodiment, an ultraviolet optical lens module is used to focus the local discharge ultraviolet signal of the detection object on a solar-blind SiC sparse pixel array. The output signal of the solar-blind SiC sparse pixel array is processed by a multi-channel peak holding unit to obtain the peak intensity information of the local discharge light pulse. The multi-channel ADC sampling and counting unit can process the output signal of the peak holding unit in parallel and convert it into a digital quantity. For example, the central processing unit of the embedded system receives the output signal of the multi-channel ADC sampling and counting unit and the signal of the visible optical imaging module, processes them and displays the visualization result. The information obtained by the ultraviolet optical lens module and the visible optical imaging module needs to be superimposed on the field of view, so the two sets of lenses need to be arranged closely to reduce the field of view error of the two sets of lenses, and the distance between the nearest edges does not exceed 2cm; to ensure the effectiveness of ultraviolet partial discharge positioning and improve the sensitivity of the system to ultraviolet signals, the transmittance of the ultraviolet band to the visible light band of the ultraviolet optical lens module is not less than 85%; the solar-blind SiC sparse element array is a square array used to couple the optical signal coupled by the ultraviolet optical lens, the pixel unit size is 0.5mm×0.5mm, and the number of pixel units is 10×10; to achieve the best ultraviolet signal detection effect, the ultraviolet optical lens imaging focal plane matches the size of the solar-blind SiC sparse element array, and the optical path diagram of the ultraviolet imaging system is as follows Figure 4 shown.

[0065] In one embodiment, the UV optical lens module is a UV-visible dual-channel imaging method developed from weak light detection technology, which has the advantages of high sensitivity, good anti-interference, and intuitive results, and has good effects in practical applications. The solar-blind UV avalanche diode involved in the present invention is an all-weather single-photon detection device based on SiC semiconductor, and its technical parameters are: unit quantum efficiency is not less than 30%, primary photoelectric gain is not less than 10 5 A / lm, dynamic range is not less than 20dB; the signal amplification circuit is part of the signal preprocessing circuit, the signal amplification circuit adopts AC coupling, and its function is to filter out interference voltage signals, amplify input signals, and improve signal-to-noise ratio. The schematic diagram of SiC diode array and preprocessing circuit is shown in Figure 5 As shown in the figure. The signal processing module realizes the noise filtering for fixed frequency and the amplification of the monitoring signal, effectively eliminating the interference of noise on data measurement and improving the sensitivity of data monitoring. In addition, through the multi-channel peak holding circuit, the discharge pulse signal is down-converted, so that the measurement bandwidth can be increased without changing the hardware, and the hardware cost of the digital acquisition module can be reduced.

[0066] In one embodiment, the portable solar-blind ultraviolet discharge orientation device can use an embedded system to process the signal of the ultraviolet optical imaging system in real time and calculate the grid node position of the discharge ultraviolet light source. The basic principle of the positioning algorithm is as shown in the attached Figure 2The output signal of the SiC photoelectric conversion array can be obtained through signal preprocessing and analog-to-digital conversion to form a 10*10 matrix, whose elements are recorded as S i,j , find the variance of each of the four adjacent elements, denoted as D i,j , is a 9*9 matrix. Find the position of the smallest element in the matrix, which is the position of the discharge location.

[0067] In one embodiment, the relative photon count per unit time obtained by the multi-channel ADC sampling and counting unit of the portable solar-blind ultraviolet discharge directional device is counted according to the voltage power frequency cycle, starting from any phase, and the phase of a power frequency cycle is divided into equally spaced windows, and the relative photon count in each window is plotted to form a pseudo-phase statistical spectrum, such as Figure 6 As shown, a three-pixel relative photon technology is used as an example for partial discharge type identification.

[0068] A positioning method based on the portable solar-blind ultraviolet discharge orientation device comprises the following steps:

[0069] The ultraviolet optical lens module collects ultraviolet pulse signals of insulation discharge outside the power equipment, the solar-blind SiC sparse pixel array generates a multi-channel electrical pulse signal based on the ultraviolet pulse signal, the multi-channel peak holding unit is connected to the solar-blind SiC sparse pixel array to generate a detection voltage signal based on the multi-channel electrical pulse signal, and the multi-channel ADC sampling counting unit is connected to the multi-channel peak holding unit to generate a partial discharge pulse peak based on the detection voltage signal and convert it into a relative number of photons received per unit time S ij ,

[0070] The positioning unit is connected to the multi-channel ADC sampling counting unit, which generates a grid node position based on the peak value of the partial discharge pulse, wherein the optical field of view is grid-divided according to the number of pixel units m×m of the solar-blind SiC sparse pixel array, the corresponding number of grids is m×m, and the variables i and j are used to represent the row index and column index in the solar-blind SiC sparse pixel array, respectively, and the grid node is recorded as n ij , i = 1: m-1, j = 1: m-1, and calculate the relative number of photons S received per unit time in each grid ij , i = 1: m, j = 1: m; calculate the relative number of photons per unit time S in the four adjacent grid areas of each grid node ij ; S i,j+1 ; S i+1,j ; S i+1,j+1 The variance D ij ; Calculate the variance D within the same integration time ij The minimum value min(D ij ), and record S xy=min(D ij ), the corresponding grid node is the discharge location,

[0071] The visible light imaging module collects visible light video images of insulation discharge outside the power equipment, and the grid node positions are superimposed on the visible light video images within the corresponding integration time for fusion.

[0072] In a preferred implementation of the positioning method, the unit time is less than 1 / 24 second.

[0073] The device of the present invention was used to conduct a partial discharge location test on the voltage transformer on the bus side of a 220kV substation GIS. The actual measurement results showed that there was partial discharge at the high-voltage incoming line end. The test and location results of the device of the present invention are as follows: Figure 7 As shown, the field of view superposition effect is as follows Figure 8 As shown, conventional partial discharge measurement methods are used for auxiliary verification, and the results show that the test results of the device of the present invention are accurate and effective.

[0074] Finally, it should be noted that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present application.

[0075] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A portable solar-blind ultraviolet discharge directional device, characterized in that: These include, Ultraviolet optical lens module, which collects ultraviolet pulse signals of insulation discharge outside power equipment; A solar-blind SiC sparse pixel array, which is arranged at the rear end of the ultraviolet optical lens module to generate a multi-channel electrical pulse signal based on the ultraviolet light pulse signal; A multi-channel peak holding unit connected to the solar-blind SiC sparse pixel array to generate a detection voltage signal based on the multi-channel electrical pulse signal, wherein the number of channels of the multi-channel peak holding unit is not less than the number of pixel units of the solar-blind SiC sparse pixel array; A multi-channel ADC sampling and counting unit, which is connected to the multi-channel peak holding unit to generate a partial discharge pulse peak value based on the detection voltage signal, and the number of channels of the multi-channel ADC sampling and counting unit is not less than the number of pixel units of the solar-blind SiC sparse pixel array; A positioning unit connected to the multi-channel ADC sampling and counting unit, which generates a grid node position based on a peak value of a partial discharge pulse; A visible light imaging module that collects visible light video images of insulation discharge outside the power equipment. The visible light imaging module and the ultraviolet optical lens module are arranged adjacent to each other so that the distance between the adjacent edges of the two does not exceed 2 cm. A central processing unit is connected to the visible light imaging module and the positioning unit to fuse the grid node positions and the visible light video image.

2. A portable solar-blind ultraviolet discharge directional device according to claim 1, characterized in that: The numerical aperture of the ultraviolet optical lens module is consistent with the numerical aperture of the visible light imaging lens of the front section of the visible light imaging module.

3. A portable solar-blind ultraviolet discharge directional device according to claim 1, characterized in that: The transmittance of the ultraviolet optical lens module from the ultraviolet band to the visible light band is not less than 85%.

4. A portable solar-blind ultraviolet discharge directional device according to claim 1, characterized in that: The solar-blind SiC sparse pixel array is a square array, the pixel unit size is not less than 0.5 mm×0.5 mm, the number of pixel units is not less than 10×10, the quantum efficiency of each pixel unit is not less than 30%, and the primary photoelectric gain is not less than 10 5 A / lm, dynamic range not less than 20dB.

5. A portable solar-blind ultraviolet discharge directional device according to claim 1, characterized in that: The multi-channel peak holding unit includes an IU conversion unit, a voltage follower unit, a signal amplification and frequency reduction detection unit.

6. A portable solar-blind ultraviolet discharge directional device according to claim 1, characterized in that: The signal amplification gain of the multi-channel peak holding unit is not less than 50dB, and the center frequency of the down-conversion detection output signal is not higher than 0.5MHz.

7. A portable solar-blind ultraviolet discharge directional device according to claim 1, characterized in that: The partial discharge pulse peak value includes the pulse peak value within the integration time, and the multi-channel ADC sampling counting unit converts the pulse peak value within the integration time into a relative photon count per unit time.

8. A portable solar-blind ultraviolet discharge directional device according to claim 1, characterized in that: The relative photon count per unit time obtained by the multi-channel ADC sampling counting unit is used to perform periodic photon number statistics according to the voltage power frequency cycle, and the phase of a power frequency cycle is divided into equally spaced windows, and the relative photon number in each window is plotted to form a pseudo-phase statistical spectrum.

9. A portable solar-blind ultraviolet discharge directional device according to claim 1, characterized in that: The visible light imaging module includes a front-end visible light imaging lens and a visible light CCD array.

10. A positioning method based on a portable solar-blind ultraviolet discharge orientation device according to any one of claims 1 to 9, characterized in that: It includes the following steps, The ultraviolet optical lens module collects ultraviolet pulse signals of insulation discharge outside the power equipment, the solar-blind SiC sparse pixel array generates a multi-channel electrical pulse signal based on the ultraviolet pulse signal, the multi-channel peak holding unit is connected to the solar-blind SiC sparse pixel array to generate a detection voltage signal based on the multi-channel electrical pulse signal, and the multi-channel ADC sampling and counting unit is connected to the multi-channel peak holding unit to generate a partial discharge pulse peak based on the detection voltage signal and convert it into the relative number of photons received per unit time , The positioning unit is connected to the multi-channel ADC sampling counting unit, which generates a grid node position based on the peak value of the partial discharge pulse, wherein the optical field is grid-divided according to the number of pixel units m×m of the solar-blind SiC sparse pixel array, the corresponding number of grids is m×m, and the variables i and j are used to represent the row index and column index in the solar-blind SiC sparse pixel array, respectively, and the grid node is recorded as , i=1:m-1, j=1:m-1, and calculate the relative number of photons received per unit time in each grid , i=1:m, j=1:m; Calculate the relative number of photons per unit time in the four adjacent grid areas of each grid node ; ; ; Variance ; Calculate the variance within the same integration time The minimum value min( ), and remember =min( ), the corresponding grid node is the discharge location, The visible light imaging module collects visible light video images of insulation discharge outside the power equipment, and the grid node positions are superimposed on the visible light video images within the corresponding integration time for fusion.

11. The positioning method according to claim 10, characterized in that: The unit time is less than 1 / 24 second.

Images