High-voltage cable partial discharge detection device and installation method

Abstract

The invention relates to the technical field of power equipment, and discloses a high-voltage cable partial discharge detection device and an installation method, and the high-voltage cable partial discharge detection device comprises a housing, a quantum detection module, a radio frequency signal module, an optical signal module, a photoelectric conversion element, a signal analysis and processing module, and a control module. And the quantum detection module comprises a diamond which is arranged between the shell and the high-voltage cable and contains an NV color center. The radio-frequency signal module comprises a radio-frequency signal transmitting assembly, a radio-frequency signal receiving element and a radio-frequency signal transmission cable, and the radio-frequency signal receiving element is arranged on the shell. The optical signal module comprises a laser signal transmitting assembly, a first optical fiber, an optical fiber coupler and a condensing lens. The first optical fiber is connected with the photoelectric conversion element, and the photoelectric conversion element is electrically connected with the signal analyzing and processing module. According to the high-voltage cable partial discharge detection device, partial discharge detection of the high-voltage cable can be realized, and injury of high-voltage current to operators is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment, and in particular to a high-voltage cable partial discharge detection device and an installation method. Background Art

[0002] Partial discharge (PD) refers to the discharge phenomenon that occurs in the insulating material or dielectric of electrical equipment due to the local electric field strength exceeding the dielectric breakdown strength. Unlike full discharge, PD does not typically lead to complete breakdown, but its presence can cause long-term damage to the insulating material, thereby affecting the reliability and service life of the equipment. PD is widely present in high-voltage equipment, transformers, cables, motors, and switchgear, especially in high-voltage power systems. Its occurrence is not only an early indicator of equipment failure but also a major cause of equipment aging, insulation breakdown, and equipment failure.

[0003] As power systems and equipment evolve toward higher voltages and larger capacities, partial discharge (PD) issues are becoming increasingly prominent. Long-term PD can cause chemical degradation, thermal aging, and mechanical damage to insulation materials, potentially leading to sudden equipment failures. Therefore, timely detection and monitoring of PD is crucial for ensuring the safe operation of power equipment and extending its lifespan. PD not only impacts the long-term stable operation of equipment but can also pose a threat to the overall security of the power grid, particularly in the crucial power transmission and distribution stages. High-voltage cables are a vital component of the power system, and monitoring them for PD is crucial for ensuring their stability. High-voltage cables carry high-voltage currents, and how to monitor PD while preventing harm to personnel is a key issue facing PD monitoring.

[0004] Therefore, there is an urgent need for a high-voltage cable partial discharge detection device and installation method to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-voltage cable partial discharge detection device and installation method to achieve partial discharge detection of high-voltage cables and prevent the high-voltage current of the high-voltage cables from causing harm to operators.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A high-voltage cable partial discharge detection device comprises: a housing, a quantum detection module, a radio frequency signal module, an optical signal module, a photoelectric conversion element, a signal analysis and processing module, and a control module;

[0008] The housing is sleeved on a high-voltage cable, and the quantum detection module includes a diamond containing NV color centers arranged between the housing and the high-voltage cable;

[0009] The radio frequency signal module includes a radio frequency signal transmitting component, a radio frequency signal receiving element and a radio frequency signal transmission cable, wherein the radio frequency signal receiving element is arranged on the housing, and the radio frequency signal receiving element is connected to the diamond containing NV color centers via the radio frequency signal transmission cable;

[0010] The optical signal module includes a laser signal transmitting assembly, a first optical fiber, a fiber coupler and a focusing lens, wherein the fiber coupler and the focusing lens are arranged on the housing, and the laser signal transmitting assembly is used to transmit an excitation laser to the diamond containing NV color centers via the first optical fiber, the fiber coupler and the focusing lens;

[0011] The first optical fiber is connected to the photoelectric conversion element, and the photoelectric conversion element is electrically connected to the signal analysis and processing module;

[0012] The laser signal transmitting component and the radio frequency signal transmitting component are both communicatively connected to the control module.

[0013] As an improvement of the above technical solution, the optical signal module also includes an optical wavelength selection element, and the laser signal transmitting component transmits an excitation laser to the first optical fiber through the optical wavelength selection element, and the fluorescence signal generated by the diamond containing NV color center is transmitted to the photoelectric conversion element through the optical wavelength selection element.

[0014] As an improvement of the above technical solution, the laser signal transmitting component includes a single longitudinal mode laser and an optical path modulation element, and the single longitudinal mode laser inputs excitation laser to the optical wavelength selection element through the optical path modulation element.

[0015] As an improvement of the above technical solution, the RF signal transmitting component includes a RF microwave signal source and a RF signal modulation element, and the RF microwave signal source transmits RF microwaves to the RF signal receiving element via the RF signal modulation element.

[0016] As an improvement of the above technical solution, it also includes a junction box, which is arranged on the shell and located outside the shell. The radio frequency signal receiving element is arranged on the junction box and is at least partially exposed from the junction box. One end of the radio frequency signal transmission cable extends into the junction box and is connected to the radio frequency signal receiving element, and the other end extends into the shell and is connected to the diamond containing NV color centers. The first optical fiber passes through the junction box.

[0017] As an improvement of the above technical solution, it further includes a power supply module, and the laser signal transmitting component, the radio frequency signal transmitting component and the control module are all electrically connected to the power supply module.

[0018] As an improvement of the above technical solution, the quantum detection module also includes an electromagnetic shielding ring, which is sleeved on the high-voltage cable and located inside the shell, and the diamond containing NV color centers is arranged between the electromagnetic shielding ring and the high-voltage cable.

[0019] As an improvement of the above technical solution, the quantum detection module also includes a magnetic focusing ring, which is sleeved on the high-voltage cable and located between the electromagnetic shielding ring and the high-voltage cable. The magnetic focusing ring is provided with a gap, which connects the outside and inside of the magnetic focusing ring, and the diamond containing NV color center is arranged in the gap.

[0020] As an improvement of the above technical solution, it also includes a supporting device, which connects the electromagnetic shielding ring, the magnetic focusing ring and the shell to the high-voltage cable.

[0021] A method for installing a high-voltage cable partial discharge detection device, used for any of the above-mentioned high-voltage cable partial discharge detection devices, comprises the following steps:

[0022] S1, cleaning the diamond containing NV color centers, the radio frequency signal receiving element, the optical fiber coupler and the focusing lens;

[0023] S2, installing the housing;

[0024] S3, installing the optical fiber coupler, the focusing lens, and the diamond containing NV color centers in the housing.

[0025] Compared with the prior art, the beneficial effects are:

[0026] The high-voltage cable partial discharge detection device of the present invention, the diamond containing NV color center is that a carbon atom in the diamond lattice is replaced by a nitrogen atom, and there is a point defect formed by a vacancy in the adjacent position of the nitrogen atom. This point defect, when laser signal and radio frequency signal are activated, can sense the external electromagnetic field and feedback by fluorescence signal, completes high-voltage cable partial discharge detection. Radio frequency microwave (that is, radio frequency signal) is emitted to radio frequency signal receiving element by radio frequency signal transmitting assembly, the radio frequency signal received by radio frequency signal receiving element is transmitted to the diamond containing NV color center through radio frequency signal transmission cable, laser signal transmitting assembly conveys excitation laser (that is, laser signal) to the diamond containing NV color center through the first optical fiber, optical fiber coupler and focusing lens, excitation laser cooperates with radio frequency signal to realize the excitation of the diamond containing NV color center, so that the diamond containing NV color center can detect the partial discharge of high-voltage cable, detection result is transmitted to signal analysis and processing module through the first optical fiber and photoelectric conversion element in the form of fluorescence signal, and signal analysis and processing module analyzes and processes fluorescence signal. The present invention provides a non-contact, highly sensitive, and stable high-voltage cable partial discharge detection device that meets the electrical insulation requirements of the high-voltage side. Without a direct electrical conductor connecting the high-voltage side (high-voltage cable side) and the low-voltage side (manual operation side such as a control module), the device transmits laser signals, radio-frequency microwaves, and fluorescent signals, thereby enabling partial discharge detection in high-voltage cables. Because there is no direct electrical conductor connecting the high-voltage and low-voltage sides, harm to operators caused by the high-voltage cable's high-voltage current is prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of a partial structure of a high-voltage cable partial discharge detection device provided by an embodiment of the present invention. Figure 1 ;

[0028] Figure 2 This is a schematic diagram of a partial structure of a high-voltage cable partial discharge detection device provided by an embodiment of the present invention. Figure 2 ;

[0029] Figure 3 This is a schematic diagram of a partial structure of a high-voltage cable partial discharge detection device provided by an embodiment of the present invention. Figure 3 ;

[0030] Figure 4 yes Figure 3 A top view of a diamond containing an NV color center;

[0031] Figure 5 This is a schematic diagram of a partial structure of a high-voltage cable partial discharge detection device provided by an embodiment of the present invention. Figure 4 .

[0032] In the picture:

[0033] 1. Shell; 11. First shell; 12. Second shell; 13. Ear plate;

[0034] 21. Diamonds containing NV color centers;

[0035] 22. Electromagnetic shielding ring; 221. First sheet; 222. Second sheet;

[0036] 23, magnetic focusing ring; 231, gap; 232, third piece; 233, fourth piece;

[0037] 31. Radio frequency signal receiving element;

[0038] 32. Radio frequency signal transmission cable;

[0039] 33. Resistance;

[0040] 41. First optical fiber;

[0041] 42. Fiber optic coupler;

[0042] 43. Condenser lens;

[0043] 44. Optical wavelength selection element; 441. Housing; 442. Prism;

[0044] 45. Second optical fiber;

[0045] 46. ​​Third optical fiber;

[0046] 5. Junction box;

[0047] 6. Support device; 61. First support rod; 62. Second support rod; 63. High-voltage cable bushing; 631. First tube segment; 632. Second tube segment;

[0048] 100. High-voltage cable. DETAILED DESCRIPTION

[0049] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0050] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0051] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0052] In the description of this embodiment, terms such as "upper," "lower," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0053] like Figure 1-Figure 5As shown, this embodiment provides a high-voltage cable partial discharge detection device, including a housing 1, a quantum detection module, a radio frequency signal module, an optical signal module, a photoelectric conversion element, a signal analysis and processing module, and a control module. The housing 1 is sleeved on the high-voltage cable 100, and the quantum detection module includes a diamond 21 containing NV color centers arranged between the housing 1 and the high-voltage cable 100. The radio frequency signal module includes a radio frequency signal transmitting component, a radio frequency signal receiving element 31, and a radio frequency signal transmission cable 32. The radio frequency signal receiving element 31 is arranged on the housing 1. The radio frequency signal transmitting component is used to transmit radio frequency microwaves (that is, radio frequency signals) to the radio frequency signal receiving element 31. The radio frequency signal receiving element 31 is connected to the diamond 21 containing NV color centers via the radio frequency signal transmission cable 32. The optical signal module includes a laser signal emitting component, a first optical fiber 41, an optical fiber coupler 42 and a focusing lens 43. The optical fiber coupler 42 and the focusing lens 43 are arranged on the housing 1. The laser signal emitting component is used to transmit an excitation laser (that is, a laser signal) to the diamond 21 containing the NV color center through the first optical fiber 41, the optical fiber coupler 42 and the focusing lens 43. The first optical fiber 41 is connected to the photoelectric conversion element, which is electrically connected to the signal analysis and processing module. The photoelectric conversion element is used to convert the fluorescence signal generated by the diamond 21 containing the NV color center into an electrical signal and transmit the electrical signal to the signal analysis and processing module. The laser signal emitting component and the radio frequency signal emitting component are both communicatively connected to the control module.

[0054] In the high-voltage cable partial discharge detection device of this embodiment, the diamond 21 containing NV color center is a point defect formed by replacing a carbon atom in the diamond lattice with a nitrogen atom and having a vacancy adjacent to the nitrogen atom. When the laser signal and the radio frequency signal are activated, this point defect can sense the external electromagnetic field and feedback through the fluorescence signal to complete the partial discharge detection of the high-voltage cable 100. The radio frequency microwave is transmitted to the radio frequency signal receiving element 31 by the radio frequency signal transmitting component. The radio frequency signal received by the radio frequency signal receiving element 31 is transmitted to the diamond 21 containing NV color center via the radio frequency signal transmission cable 32. The laser signal transmitting component transmits a laser signal to the diamond 21 containing NV color center via the first optical fiber 41, the optical fiber coupler 42 and the focusing lens 43. The laser signal and the radio frequency signal cooperate to realize the excitation of the diamond 21 containing NV color center, so that the diamond 21 containing NV color center can detect the partial discharge of the high-voltage cable 100. The detection result is transmitted to the signal analysis and processing module in the form of a fluorescence signal via the first optical fiber 41 and the photoelectric conversion element. The signal analysis and processing module analyzes and processes the fluorescence signal. The high-voltage cable partial discharge detection device provided in this embodiment is a non-contact detection device that meets the insulation electrical requirements of the high-voltage side and is highly sensitive and stable. Without any electrical wires connecting the high-voltage side (the high-voltage cable 100 side) and the low-voltage side (the manual operation side such as the control module), it enables the transmission of excitation laser, radio frequency microwave, and fluorescent signals, thereby enabling partial discharge detection in the high-voltage cable 100. Because there is no direct electrical wire connecting the high-voltage and low-voltage sides, harm to operators caused by the high-voltage current of the high-voltage cable 100 can be avoided.

[0055] Alternatively, as Figure 5 As shown, the optical signal module also includes an optical wavelength selection element 44. The laser signal transmitting assembly transmits an excitation laser to the first optical fiber 41 via the optical wavelength selection element 44. The fluorescence signal generated by the diamond 21 containing the NV color center is transmitted to the photoelectric conversion element via the optical wavelength selection element 44. Specifically, in this embodiment, the optical wavelength selection element 44 includes a housing 441 and a prism 442. The prism 442 is disposed within the housing 441. In this embodiment, the wavelength of light selected by the optical wavelength selection element 44 (that is, transmitted by the prism 442) is 590.8nm-950nm, and the wavelength of the excitation laser is 529nm-535nm. The excitation laser cannot be transmitted by the prism 442, but is reflected by the prism 442 to the first optical fiber 41. The fluorescence signal can be transmitted by the prism 442. After being transmitted by the prism 442, the fluorescence signal is transmitted to the photoelectric conversion element.

[0056] Furthermore, if Figure 5As shown, the optical signal module further includes a second optical fiber 45 and a third optical fiber 46. The laser signal transmitting assembly is connected to the optical wavelength selection element 44 via the second optical fiber 45, and the optical wavelength selection element 44 is connected to the photoelectric conversion element via the third optical fiber 46. In other words, in this embodiment, the first optical fiber 41 is connected to the photoelectric conversion element via the optical wavelength selection element 44 and the third optical fiber 46, and the fluorescence signal transmitted through the prism 442 is transmitted to the photoelectric conversion element via the third optical fiber 46.

[0057] Specifically, the laser signal emitted by the laser signal emitting component is transmitted to the optical wavelength selection element 44 via the second optical fiber 45, enters the first optical fiber 41 after being reflected by the prism 442 of the optical wavelength selection element 44, and then irradiates the diamond 21 containing the NV color center after passing through the first optical fiber 41, the optical fiber coupler 42 and the focusing lens 43. The NV color center excited by the laser signal and the radio frequency signal senses the external electromagnetic field and generates fluorescence. The fluorescence signal then returns through the focusing lens 43, the optical fiber coupler 42 and the first optical fiber 41, is filtered by the prism 442 of the optical wavelength selection element 44, and is transmitted into the third optical fiber 46. It reaches the photoelectric conversion element through the third optical fiber 46, and the photoelectric conversion element realizes the conversion of the fluorescence signal into an electrical signal. The converted electrical signal reaches the signal analysis and processing module, and is analyzed and processed by the signal analysis and processing module.

[0058] In this embodiment, the first optical fiber 41 is a 50 μm / 125 μm (core diameter / cladding diameter) multimode optical fiber, the second optical fiber 45 is a 65.2 μm / 125 μm multimode optical fiber, and the third optical fiber 46 is a 105 μm / 125 μm multimode optical fiber. The prism 442 of the optical wavelength selection element 44 reflects light in the range of 350 nm to 570 nm (reflection efficiency >95%) and transmits light in the range of 590.8 nm to 950 nm (transmission efficiency >93%).

[0059] Optionally, the laser signal transmission assembly includes a single longitudinal mode laser and an optical path modulation element. The single longitudinal mode laser inputs excitation laser light to the optical wavelength selection element 44 via the optical path modulation element. The laser signal used to excite the quantum sensor (i.e., the diamond 21 containing NV color centers) is generated by the single longitudinal mode laser. After the optical path modulation element processes the signal's power, polarization characteristics, modulation characteristics, etc., the signal is input into the second optical fiber 45 and reaches the optical wavelength selection element 44 via the second optical fiber 45.

[0060] Optionally, the RF signal transmitting component includes an RF microwave signal source, an RF signal modulation element, and an RF antenna. The RF microwave signal source transmits RF microwaves to the RF signal receiving element 31 via the RF signal modulation element. Specifically, the RF microwave signal source outputs a microwave RF signal, which is pre-processed by the RF signal modulation element, such as amplification, modulation, and noise reduction, before being directionally transmitted to the RF signal receiving element 31 via the RF antenna. The RF signal receiving element 31 is responsible for receiving the RF signal and transmitting the RF signal to the diamond 21 containing the NV color center via the RF signal transmission cable 32 to activate and enable it to operate. In this embodiment, the frequency range of the RF signal is 1.7 GHz to 3.4 GHz.

[0061] Alternatively, as Figure 1 and Figure 2 As shown, the high-voltage cable partial discharge detection device provided in this embodiment also includes a junction box 5, which is arranged on the shell 1 and is located outside the shell 1. The radio frequency signal receiving element 31 is arranged on the junction box 5 and is at least partially exposed to the junction box 5. One end of the radio frequency signal transmission cable 32 extends into the junction box 5 and is connected to the radio frequency signal receiving element 31, and the other end extends into the shell 1 and is connected to the diamond 21 containing NV color center. The first optical fiber 41 passes through the junction box 5. In this embodiment, the first optical fiber 41 includes a first optical fiber segment and a second optical fiber segment. One end of the first optical fiber segment is connected to the optical fiber coupler 42, and the other end extends into the junction box 5. One end of the second optical fiber segment extends into the junction box 5 and is connected to the first optical fiber segment, and the other end extends to the optical wavelength selection element 44. The first optical fiber segment and the second optical fiber segment are both covered with an insulating shell. The radio frequency signal receiving element 31 is fixed on the junction box 5. Specifically, as shown in FIG. Figure 3 and Figure 4 As shown, one end of the RF signal transmission cable 32 is connected to the RF signal receiving element 31, the middle part is connected to the side of the diamond 21 containing NV color center away from the focusing lens 43, and a microwave coil is formed there. The other end is connected to the resistor 33. In this embodiment, the resistance of the resistor 33 is 50Ω, and the microwave coil is Ω-type.

[0062] Optionally, the high-voltage cable partial discharge detection device provided in this embodiment further includes a power module, to which the laser signal transmitting component, the radio frequency signal transmitting component, and the control module are all electrically connected. The power module is used to supply power to the radio frequency signal module, the optical signal module, and the control module.

[0063] Alternatively, as Figure 1 and Figure 2 As shown, the housing 1 includes a first housing 11 and a second housing 12 arranged opposite to each other. Ear plates 13 are provided at both ends of the first housing 11 and the second housing 12. The ear plates 13 of the first housing 11 are connected to the ear plates 13 of the second housing 12 by bolts.

[0064] Alternatively, as Figure 2 As shown, the quantum detection module also includes an electromagnetic shielding ring 22, which is sleeved on the high-voltage cable 100, and the electromagnetic shielding ring 22 is located in the housing 1, and the diamond 21 containing NV color centers is arranged between the electromagnetic shielding ring 22 and the high-voltage cable 100. The electromagnetic shielding ring 22 is made of soft magnetic alloy and is used to shield the electromagnetic interference signal of the external environment. It can be understood by those skilled in the art that there are often external electromagnetic field changes such as lightning strikes on the high-voltage side (high-voltage cable 100 side), which poses a challenge to the measurement of partial discharge signals. The electromagnetic shielding ring 22 in this embodiment can play a role in shielding the external electromagnetic field. Combined with the optical initialization and optical readout characteristics of the diamond quantum measurement scheme, the measured signal is less affected during the transmission process, so that the high-voltage cable partial discharge detection device in this embodiment has a strong application advantage.

[0065] Alternatively, as Figure 2 As shown, the quantum detection module also includes a magnetic focusing ring 23, which is sleeved on the high-voltage cable 100 and located between the electromagnetic shielding ring 22 and the high-voltage cable 100. The magnetic focusing ring 23 is provided with a gap 231. The gap 231 on the magnetic focusing ring 23 connects the outside and inside of the magnetic focusing ring 23. The diamond 21 containing the NV color center is arranged in the gap 231 of the magnetic focusing ring 23. The magnetic focusing ring 23 is made of a soft magnetic alloy and is used to amplify the magnetic field signal generated by the alternating current.

[0066] Alternatively, as Figure 2 As shown, the high-voltage cable partial discharge detection device provided in this embodiment further includes a supporting device 6 , which is used to connect the electromagnetic shielding ring 22 , the magnetic focusing ring 23 and the housing 1 to the high-voltage cable 100 .

[0067] Furthermore, if Figure 2As shown, the support device 6 includes a first support rod 61, a second support rod 62, and a high-voltage cable bushing 63. The high-voltage cable bushing 63 includes a first tube segment 631 and a second tube segment 632. One end of the first support rod 61 is fixedly connected to the first housing 11, and the other end is fixedly connected to the first tube segment 631. One end of the second support rod 62 is fixedly connected to the second housing 12, and the other end is fixedly connected to the second tube segment 632. In this embodiment, a plurality of first support rods 61 and second support rods 62 are provided. The cross-sections of the first tube segment 631 and the second tube segment 632 are both semicircular, so that the first tube segment 631 and the second tube segment 632 can cooperate to cover the cylindrical high-voltage cable 100. The first tube segment 631 and the second tube segment 632 are covered on the high-voltage cable 100. The first shell 11 is connected to the first tube segment 631 via the first support rod 61, and the second shell 12 is connected to the second tube segment 632 via the second support rod 62. The two ends of the first shell 11 along the circumference of the high-voltage cable 100 and the two ends of the second shell 12 along the circumference of the high-voltage cable 100 are respectively connected by bolts, so that the shell 1 and the high-voltage cable sleeve 63 can cooperate to cover the high-voltage cable 100. In this embodiment, the first shell 11 and the first tube segment 631 are both welded and fixed to the first support rod 61, and the second shell 12 and the second tube segment 632 are both welded and fixed to the second support rod 62.

[0068] Furthermore, if Figure 2 As shown, the electromagnetic shielding ring 22 includes a first plate 221 and a second plate 222. The first plate 221 is disposed between the first tube segment 631 and the first shell 11 and is fixedly connected to the first support rod 61. The second plate 222 is disposed between the second tube segment 632 and the second shell 12 and is fixedly connected to the second support rod 62. Specifically, the first support rod 61 passes through the first plate 221 and is welded and fixed to the first support rod 61. The second support rod 62 passes through the second plate 222 and is welded and fixed to the second support rod 62. The magnetic focusing ring 23 includes a third plate 232 and a fourth plate 233. The third plate 232 is disposed between the first plate 221 and the first tube segment 631 and is fixedly connected to the first support rod 61. The fourth plate 233 is disposed between the second plate 222 and the second tube segment 632 and is fixedly connected to the second support rod 62. Specifically, the first support rod 61 passes through the third piece 232 , and the third piece 232 is welded and fixed to the first support rod 61 . The second support rod 62 passes through the fourth piece 233 , and the fourth piece 233 is welded and fixed to the second support rod 62 .

[0069] This embodiment also provides a method for installing a high-voltage cable partial discharge detection device, comprising the following steps:

[0070] S1: Clean the diamond 21 containing NV centers, the RF signal receiving element 31, the fiber coupler 42, and the focusing lens 43. Because the diamond 21 containing NV centers needs to operate in a near-dust-free environment, a non-woven fabric soaked in anhydrous ethanol is used to wipe the surface of the diamond 21 containing NV centers to remove dust. The threaded holes inside the cover of the junction box 5 are also cleaned.

[0071] S2, install the shell 1, electromagnetic shielding ring 22, magnetic focusing ring 23 and high-voltage cable bushing 63, specifically including installing the shell 1, electromagnetic shielding ring 22, magnetic focusing ring 23 and high-voltage cable bushing 63 on the high-voltage cable 100, the high-voltage cable 100 passes through the inner hole of the high-voltage cable bushing 63, and then the first shell 11 and the second shell 12 are fixed together by bolts passing through the screw holes on the ear plate 13 of the first shell 11 and the ear plate 13 of the second shell 12. At this time, the fixation of the shell 1 is completed.

[0072] S3. Install the fiber coupler 42, focusing lens 43, and diamond 21 containing NV centers within housing 1. These are arranged contactlessly around the high-voltage cable 100. To ensure the highest possible measurement sensitivity, the quantum sensor (i.e., diamond 21 containing NV centers) should be as close to the high-voltage cable 100 as possible without contacting it. After the probe assembly is installed, seal the hole in housing 1 with a sealing ring.

[0073] S4. Install the junction box 5, arrange the first optical fiber segment and the RF signal transmission cable 32 reasonably, and do not bend the first optical fiber segment to ensure the highest possible light transmission efficiency. Install the RF signal receiving element 31 on the junction box 5 through the threaded hole. Install the junction box 5 on the housing 1 through the threaded hole. After the wiring in the junction box 5 is completed, fix the cover plate on the junction box 5 to the junction box 5 using screws and threaded holes.

[0074] S5 , connecting the second optical fiber segment to the junction box 5 . After the assembly is completed, the fluorescent signal will be transmitted to the low-voltage side through the first optical fiber 41 .

[0075] In summary, the embodiments of the present invention provide a high-voltage cable partial discharge detection device. This is a non-contact detection device that meets the high-voltage side insulation electrical requirements and has high sensitivity and stability. Without connecting the high-voltage side (high-voltage cable 100 side) and the low-voltage side (manual operation side such as the control module) with electrical wires, it enables the transmission of laser signals, radio frequency signals, and fluorescent signals, thereby enabling partial discharge detection of the high-voltage cable 100. Furthermore, an assembly method for this device is designed. Taking into account the complex electromagnetic field environment on the high-voltage side, an environmental shielding device (electromagnetic shielding ring 22) and a magnetic field focusing device (magnetic field focusing ring 23) are designed to improve the signal-to-noise ratio.

[0076] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A high-voltage cable partial discharge detection device, characterized in that: include: Housing, quantum detection module, radio frequency signal module, optical signal module, photoelectric conversion element, signal analysis and processing module and control module; The housing is sleeved on a high-voltage cable, and the quantum detection module includes a diamond containing NV color centers arranged between the housing and the high-voltage cable; The radio frequency signal module includes a radio frequency signal transmitting component, a radio frequency signal receiving element and a radio frequency signal transmission cable, wherein the radio frequency signal receiving element is arranged on the housing, and the radio frequency signal receiving element is connected to the diamond containing NV color centers via the radio frequency signal transmission cable; The optical signal module includes a laser signal transmitting assembly, a first optical fiber, a fiber coupler and a focusing lens, wherein the fiber coupler and the focusing lens are arranged on the housing, and the laser signal transmitting assembly is used to transmit an excitation laser to the diamond containing NV color centers via the first optical fiber, the fiber coupler and the focusing lens; The first optical fiber is connected to the photoelectric conversion element, and the photoelectric conversion element is electrically connected to the signal analysis and processing module; The laser signal transmitting component and the radio frequency signal transmitting component are both communicatively connected to the control module.

2. The high-voltage cable partial discharge detection device according to claim 1, characterized in that: The optical signal module further includes an optical wavelength selection element, and the laser signal transmitting component transmits an excitation laser to the first optical fiber via the optical wavelength selection element, and the fluorescence signal generated by the diamond containing the NV color center is transmitted to the photoelectric conversion element via the optical wavelength selection element.

3. The high-voltage cable partial discharge detection device according to claim 2, characterized in that: The laser signal transmitting component includes a single longitudinal mode laser and an optical path modulation element. The single longitudinal mode laser inputs excitation laser light to the optical wavelength selection element via the optical path modulation element.

4. The high-voltage cable partial discharge detection device according to claim 1, characterized in that: The radio frequency signal transmitting component includes a radio frequency microwave signal source and a radio frequency signal modulation element. The radio frequency microwave signal source transmits radio frequency microwaves to the radio frequency signal receiving element via the radio frequency signal modulation element.

5. The high-voltage cable partial discharge detection device according to claim 1, characterized in that: It also includes a junction box, which is arranged on the shell and located outside the shell. The radio frequency signal receiving element is arranged on the junction box and is at least partially exposed from the junction box. One end of the radio frequency signal transmission cable extends into the junction box and is connected to the radio frequency signal receiving element, and the other end extends into the shell and is connected to the diamond containing NV color centers. The first optical fiber passes through the junction box.

6. The high-voltage cable partial discharge detection device according to claim 1, characterized in that: It also includes a power supply module, and the laser signal transmitting component, the radio frequency signal transmitting component and the control module are all electrically connected to the power supply module.

7. The high-voltage cable partial discharge detection device according to claim 1, characterized in that: The quantum detection module also includes an electromagnetic shielding ring, which is sleeved on the high-voltage cable and located inside the shell. The diamond containing NV color centers is arranged between the electromagnetic shielding ring and the high-voltage cable.

8. The high-voltage cable partial discharge detection device according to claim 7, characterized in that: The quantum detection module also includes a magnetic focusing ring, which is sleeved on the high-voltage cable and located between the electromagnetic shielding ring and the high-voltage cable. The magnetic focusing ring is provided with a gap, which connects the outside and inside of the magnetic focusing ring, and the diamond containing NV color center is arranged in the gap.

9. The high-voltage cable partial discharge detection device according to claim 8, characterized in that: It also includes a supporting device, which connects the electromagnetic shielding ring, the magnetic focusing ring and the shell to the high-voltage cable.

10. A method for installing a high-voltage cable partial discharge detection device, characterized in that: The method for installing the high-voltage cable partial discharge detection device according to any one of claims 1 to 9 comprises the following steps: S1, cleaning the diamond containing NV color centers, the radio frequency signal receiving element, the optical fiber coupler and the focusing lens; S2, installing the housing; S3, installing the optical fiber coupler, the focusing lens, and the diamond containing NV color centers in the housing.

Images