Partial discharge detection device and system

Abstract

The utility model relates to a partial discharge detection device and system. The device comprises a sensor and a connecting piece, the sensor is used for being connected with a to-be-detected piece and obtaining a sound wave signal generated by the to-be-detected piece, and the connecting piece is connected with the sensor so as to transmit a signal output by the sensor to a partial discharge detector; the sensor comprises a shell, a first optical path and a second optical path, the first optical path and the second optical path are connected with the connecting piece through optical fiber cables, and the shell is provided with a containing cavity; the first optical path is arranged in the accommodating cavity and is used for acquiring a sound wave signal generated by the to-be-tested piece, converting the sound wave signal into an optical signal and outputting the optical signal; and the second optical path is arranged in the accommodating cavity and is used for providing and outputting a reference optical signal. The reference optical signal provided by the second optical path can be used for calibrating the detection signal of the first optical path, and by comparing the reference signal with the actual detection signal, the system can eliminate environmental noise and other interferences and improve the precision of the detection result.

Description

Technical Field

[0001] The utility model relates to the technical field of cable detection, in particular to a partial discharge detection device and system. Background Art

[0002] With the rapid development of power system technology, online monitoring of power equipment has gained widespread application. Among these monitoring technologies, partial discharge detection stands out as a key means of condition monitoring for high-voltage electrical equipment. Partial discharge refers to the electrical discharge phenomenon within an electrical insulation system caused by excessively high electric field strength in a localized area. This discharge phenomenon is often difficult to detect in its early stages, but over time it can cause irreversible damage to the insulation material, ultimately leading to equipment failure or even destruction. Therefore, early detection and monitoring of partial discharge is crucial for preventing power equipment failures and ensuring the safe operation of power systems.

[0003] Electrical sensors are currently the most common testing method, including HFCT, ultra-high frequency sensors, and acoustic emission sensors. However, they are all based on converting electromagnetic signals and acoustic signals into electrical signals, and then collecting and analyzing them. However, they also have many problems, including power supply problems. The signal collection site is susceptible to electromagnetic interference. How to obtain partial discharge signal information in a complex site is very complex and difficult.

[0004] In recent years, with the continuous development of fiber optic sensing technology, fiber optic monitoring technology for transformers, switchgear, GIS, power cables, etc. has also been continuously developing. At present, fiber optic temperature measurement, fiber optic stress and strain measurement, etc. have been maturely applied in power equipment. However, there has been no major breakthrough in the field of partial discharge measurement through fiber optics. The main reason is that the existing sensors for measuring partial discharge through fiber optics have low accuracy. Utility Model Content

[0005] Based on this, it is necessary to provide a partial discharge detection device and system to address the problems of low detection accuracy and poor anti-interference performance of existing devices.

[0006] The present application provides a partial discharge detection device, which includes a sensor and a connector. The sensor is used to connect to a device under test and obtain an acoustic wave signal generated by the device under test. The connector is connected to the sensor to transmit the signal output by the sensor to a partial discharge detector.

[0007] The sensor includes a housing, a first light path and a second light path, the first light path and the second light path are connected to the connector via an optical fiber cable, and the housing has a receiving cavity;

[0008] The first optical path is provided in the accommodating cavity, and is used to obtain the acoustic wave signal generated by the device under test, and convert the acoustic wave signal into an optical signal for output;

[0009] The second optical path is provided in the accommodating cavity and is used for providing and outputting a reference optical signal.

[0010] In one embodiment, the sensor further includes a signal amplifying component, which is covered on the first optical path and is used to collect and amplify the acoustic wave signal generated by the device under test for acquisition by the first optical path.

[0011] In one embodiment, the housing includes a base plate and a cover, wherein the cover is disposed on the base plate and together with the base plate, encloses the accommodating cavity;

[0012] The substrate is used to adhere to the surface of the test piece, and the cover is used to shield interference.

[0013] In one embodiment, the first light passage and the second light passage are respectively arranged on opposite end surfaces in the accommodating cavity, wherein the first light passage is arranged on the substrate, and the second light passage is arranged on the cover.

[0014] In one embodiment, the first optical path includes a first support member and a first platform, the first platform is connected to the substrate via the first support member, and a first groove body for winding an optical fiber is provided on the first platform;

[0015] The second optical path includes a second support member and a second platform. The second platform is connected to the cover body through the second support member. A second groove body for winding the optical fiber is provided on the second platform.

[0016] In one embodiment, the first support member and the second support member are of different lengths.

[0017] In one embodiment, the sensor further includes an output port, which is provided on the cover body, and the output port is used to fixedly connect the optical fibers wound around the first platform and the second platform to form the optical fiber cable.

[0018] In one embodiment, the optical fibers wound on the first platform and the second platform are both single-mode optical fibers, the optical fiber cable is a multi-core single-mode optical fiber with a protective layer, the optical fiber cable is connected to the connector, and the connector has an LC interface that matches the number of cores of the optical fiber cable.

[0019] In one embodiment, the signal amplifying component is a hemispherical structure made of metal;

[0020] The substrate is made of plastic, the cover is made of metal, and the first platform and the second platform are disc structures made of plastic.

[0021] The present application also provides a partial discharge detection system, comprising a plurality of the aforementioned partial discharge detection devices and a partial discharge detector, wherein the plurality of the partial discharge detection devices are respectively connected to the partial discharge detector.

[0022] In the aforementioned partial discharge detection device, because the first optical path converts acoustic signals into optical signals for transmission, optical signals experience lower attenuation and interference during transmission than electrical signals. This enables highly sensitive signal detection, maintaining signal integrity and accuracy even over long distances. Optical signals are unaffected by electromagnetic interference, allowing the sensor and connector to provide stable and accurate signal transmission in complex electromagnetic environments. This improves the reliability of partial discharge detection. The sensor can acquire the acoustic signal from the device under test in real time and quickly convert it into an optical signal for transmission to the detector. This enables the system to monitor device status in real time, promptly detect and warn of partial discharge events, and prevent equipment damage and malfunction. The reference optical signal provided by the second optical path can be used to calibrate the detection signal of the first optical path. By comparing the reference signal with the actual detection signal, the system can eliminate environmental noise and other interference, improving the accuracy of the detection results. The sensor integrates the acquisition of acoustic signals and the conversion of optical signals within a single housing, resulting in a compact structure.

[0023] By installing multiple detection devices, the aforementioned partial discharge detection system can cover a wider detection area, increasing the coverage of the detection system. Each detection device can independently detect partial discharge signals within its own range, enabling multi-point synchronous monitoring. The partial discharge detector is used to receive optical signals transmitted from the sensor, perform signal processing and analysis, and detect partial discharge events. In this embodiment, the partial discharge detector centrally receives signals from multiple detection devices, compares and analyzes the signals from each detection device, and provides comprehensive partial discharge detection results. The design of multiple detection devices increases system redundancy. Even if a device fails, the other devices can still operate normally, ensuring system reliability. The number and layout of detection devices can be flexibly adjusted according to actual detection needs to accommodate detection tasks of varying scale and complexity. The partial discharge detector uniformly receives and processes signals from multiple detection devices and performs comprehensive analysis of data from multiple signal sources, enabling more accurate determination of the specific location and severity of partial discharge, thereby improving the accuracy and reliability of detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the overall structure of a partial discharge detection device provided in one embodiment of the present application;

[0025] Figure 2 A schematic diagram of the internal structure of a partial discharge detection device provided in one embodiment of the present application;

[0026] Figure 3 A connection diagram of a partial discharge detection system provided in one embodiment of the present application.

[0027] Description of reference numerals:

[0028] 100 - sensor; 110 - housing; 111 - substrate; 112 - cover; 120 - first optical path; 121 - first support member; 122 - first platform; 130 - second optical path; 131 - second support member; 132 - second platform; 140 - signal amplification component; 150 - output port;

[0029] 200-connector;

[0030] 300-Partial discharge detector. DETAILED DESCRIPTION

[0031] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] 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", "axial", "radial", "circumferential" and the like to 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0037] See Figure 1 An embodiment of the present invention provides a partial discharge detection device, which includes a sensor 100 and a connector 200. The sensor 100 is used to connect to a device under test and obtain an acoustic wave signal generated by the device under test. The connector 200 is connected to the sensor 100 to transmit the signal output by the sensor 100 to a partial discharge detector 300.

[0038] The sensor 100 includes a housing 110, a first light passage 120 and a second light passage 130, the first light passage 120 and the second light passage 130 are connected to the connector 200 via an optical fiber cable, and the housing 110 has a receiving cavity;

[0039] The first optical path 120 is provided in the accommodating cavity, and is used to obtain the acoustic wave signal generated by the device under test, and convert the acoustic wave signal into an optical signal for output;

[0040] The second optical path 130 is provided in the accommodating cavity, and is used to provide and output a reference optical signal.

[0041] In this embodiment, the sensor 100 is a core component of the partial discharge detection device, which is used to connect to the test piece and obtain the acoustic wave signals generated by it. The sensor 100 converts these acoustic wave signals into optical signals and outputs them to the partial discharge detector 300 via an optical fiber cable. The function of the shell 110 is to provide a structure that protects and fixes the internal optical path and forms a accommodating cavity. The first optical path 120 is located in the accommodating cavity of the shell 110 and is used to obtain the high-frequency acoustic wave signals generated by the test piece. The acquired acoustic wave signals are converted into optical signals and output via an optical fiber cable. The second optical path 130 is also located in the accommodating cavity of the shell 110 and is used to provide and output a reference optical signal. The reference optical signal is used for calibration and comparison to ensure the accuracy of the detection. The connector 200 is used to connect the sensor 100 and the partial discharge detector 300 and transmit the optical signal output by the sensor 100 to the detector.

[0042] Because the first optical path 120 converts acoustic signals into optical signals for transmission, optical signals experience lower attenuation and interference during transmission than electrical signals. This enables highly sensitive signal detection, maintaining signal integrity and accuracy even over long distances. Optical signals are unaffected by electromagnetic interference, allowing the sensor 100 and connector 200 to provide stable and accurate signal transmission in complex electromagnetic environments. This improves the reliability of partial discharge detection. The sensor 100 acquires the acoustic signals from the device under test in real time and rapidly converts them into optical signals for transmission to the detector. This enables the system to monitor device status in real time, promptly detect and warn of partial discharge events, and prevent equipment damage and malfunction. The reference optical signal provided by the second optical path 130 can be used to calibrate the detection signal of the first optical path 120. By comparing the reference signal with the actual detection signal, the system can eliminate environmental noise and other interference, improving the accuracy of detection results. The sensor 100 integrates acoustic signal acquisition and optical signal conversion within a single housing 110, resulting in a compact structure. Transmitting signals via optical fiber cables not only reduces cable complexity but also improves system reliability and ease of installation.

[0043] Exemplarily, the first optical path 120 obtains the acoustic wave signal from the device under test and converts it into an optical signal, which contains the target signal and interference in various transmission paths. The second optical path 130 provides a reference optical signal, which is the same as the interference in the transmission path, but does not contain the target signal. By ensuring that the signals of the two optical paths are synchronized in time, the interference signals can be accurately aligned and offset during the subtraction process. The interference signals in the transmission process and the external environment are effectively removed, and the pure target signal is extracted. By setting the second optical path 130 to provide a reference optical signal, the signal-to-noise ratio of the signal is improved, so that the detection system can work more accurately and stably, thereby enabling accurate signal detection in complex and noisy environments, and improving the robustness and reliability of the system.

[0044] See Figure 2 In one embodiment, the sensor 100 further includes a signal amplifying component 140 , which is covered on the first optical path 120 and is used to collect and amplify the acoustic wave signal generated by the device under test for acquisition by the first optical path 120 .

[0045] In this embodiment, the acoustic wave signal amplified by the DUT is amplified, allowing even weak acoustic signals to be detected, thereby improving the sensitivity of sensor 100. The amplified signal is more easily converted into an optical signal by first optical path 120, thereby enhancing signal detection accuracy. Signal amplification improves signal quality, reduces the impact of signal noise, and ensures more accurate signals transmitted to partial discharge detector 300.

[0046] Specifically, the signal amplification component 140 is a hemispherical structure made of metal, copper in this embodiment. The hemispherical structure can focus the acoustic signal to produce resonance, thus providing better sound collection. This design allows the acoustic signal to be more concentratedly transmitted to the first optical path 120, enhancing signal strength. It also reduces the scattering and attenuation of the acoustic wave during transmission, ensuring the strength and clarity of the acoustic signal, thereby improving signal detection accuracy. Copper has excellent thermal conductivity and acoustic properties, effectively conducting and amplifying acoustic signals, improving signal quality and strength. Copper's excellent acoustic conductivity makes the amplified signal more stable and less noisy, thereby improving signal quality and ensuring more accurate signals transmitted to the partial discharge detector 300. The choice of copper material and the design of the hemispherical structure work together to enhance the sensitivity and detection accuracy of the sensor 100, while also improving signal quality and ensuring signal stability and accuracy in complex environments. These improvements make the partial discharge detection device more reliable and efficient in practical applications.

[0047] See Figure 2In one embodiment, the housing 110 includes a substrate 111 and a cover 112. The cover 112 is covered on the substrate 111 and together with the substrate 111, forms a receiving cavity. The substrate 111 is used to fit the surface of the device under test, and the cover 112 is used to shield interference.

[0048] In this embodiment, the substrate 111 is attached to the surface of the test piece, ensuring that the acoustic wave signal can be transmitted to the sensor 100 more efficiently, thereby improving the signal acquisition effect. The tightly fitting design reduces the attenuation of the acoustic wave signal during transmission and enhances the signal strength. The shielding effect of the cover 112 effectively reduces the impact of external electromagnetic interference and environmental noise on the internal optical path and signal amplification component 140 of the sensor 100, improves the purity and stability of the signal, and helps to improve the accuracy of partial discharge detection. The protective effect of the cover 112 extends the service life of the internal components of the sensor 100 and ensures the long-term stable operation of the sensor 100. The shielding design of the cover 112 enables the sensor 100 to maintain efficient operation in complex and harsh environments, enhancing the environmental adaptability of the system. The modular design of the substrate 111 and the cover 112 makes the installation and maintenance of the sensor 100 more convenient, which helps to quickly deploy and repair it in actual applications.

[0049] Specifically, substrate 111 is made of plastic, and cover 112 is made of metal. In this embodiment, cover 112 is made of copper. The flexibility and adaptability of plastic substrate 111 allow it to fit tightly against the surface of the test object, ensuring efficient transmission of acoustic signals to sensor 100. Copper cover 112 offers excellent electromagnetic shielding properties, effectively reducing the impact of external electromagnetic interference and ambient noise on the optical path and signal amplification component 140 within sensor 100. The protective effect of copper cover 112 extends the service life of sensor 100's internal components, ensuring long-term stable operation of sensor 100.

[0050] See Figure 2 In one embodiment, the first light passage 120 and the second light passage 130 are respectively arranged on opposite end surfaces in the accommodating cavity, wherein the first light passage 120 is arranged on the substrate 111 and the second light passage 130 is arranged on the cover 112.

[0051] In this embodiment, the first optical path 120 and the second optical path 130 are respectively arranged on the opposite end surfaces in the accommodating cavity so that the two can work independently, reduce mutual interference, and ensure the stability of signal acquisition and transmission. This layout design helps to physically separate the signal optical path and the reference optical path, reduce interference between signals, and improve detection accuracy. Since the substrate 111 is in close contact with the surface of the test piece, the first optical path 120 can more directly obtain the acoustic wave signal and directly convert it into an optical signal, reducing signal attenuation and noise interference. The second optical path 130 is located on the cover 112, opposite to the first optical path 120, and can provide a stable reference optical signal for calibration and comparison, thereby improving the accuracy of the overall detection system. After the signal of the first optical path 120 is compared and subtracted from the signal of the second optical path 130, the interference in the transmission path can be removed.

[0052] See Figure 2 In one embodiment, the first optical path 120 includes a first support member 121 and a first platform 122 . The first platform 122 is connected to the substrate 111 through the first support member 121 . The first platform 122 is provided with a first groove for winding an optical fiber.

[0053] The second optical path 130 includes a second support member 131 and a second platform 132. The second platform 132 is connected to the cover 112 via the second support member 131. A second groove for winding optical fibers is provided on the second platform 132. Specifically, in this embodiment, the first platform 122 and the second platform 132 are plastic disc structures.

[0054] The plastic disc structure provides a stable fiber optic winding platform, reducing fiber movement and vibration, and improving signal transmission quality. The grooves on the disc structure optimize the layout of the optical fiber, reduce bending and refraction loss of the optical fiber, and ensure efficient signal transmission. The plastic material has good electrical insulation properties, reducing the impact of electromagnetic interference on the optical signal and improving the reliability of the system. The lightweight plastic material reduces the weight of the sensor 100, reduces the burden on the substrate 111 and the cover 112, and improves the durability and reliability of the sensor 100. The plastic material is easy to process and form, which simplifies the manufacturing process and reduces production costs. The disc structure design facilitates the installation and maintenance of optical fibers, reduces the difficulty and time of maintenance, and improves the maintainability of the system. The lightweight, insulating disc structure is suitable for various environmental conditions and enhances the applicability and flexibility of the system. The independent design of the first platform 122 and the second platform 132 gives the system good modular expansion capabilities, facilitating system upgrades and expansions.

[0055] See Figure 2In one embodiment, the first support member 121 and the second support member 131 are of different lengths. Specifically in this embodiment, the length of the first support member 121 is greater than that of the second support member 131, which means that the first platform 122 is located farther away from the substrate 111. The longer support member makes the arrangement of the optical fibers on the first optical path 120 more flexible, which is beneficial for signal acquisition and transmission. The shorter length of the second support member 131 means that the second platform 132 is closer to the cover body 112. The shorter support member is beneficial to the stability of the reference optical path and the signal transmission efficiency.

[0056] Because the first support member 121 is longer, the signal acquisition portion of the first optical path 120 is moved away from the cover 112, which helps reduce the impact of electromagnetic interference and mechanical vibration. The longer support member makes the optical fiber arrangement on the first optical path 120 more flexible, reduces signal loss caused by optical fiber bending, and enhances the stability of signal transmission. The different lengths of the first support member 121 and the second support member 131 allow for greater separation in physical space between the first optical path 120 and the second optical path 130, reducing mutual interference between signals. The greater physical separation makes the contrast subtraction processing more accurate, improves the removal of interference signals, and thus improves signal purity.

[0057] See Figure 2 In one embodiment, the sensor 100 further includes an output port 150 , which is disposed on the cover 112 . The output port 150 is configured to fixedly connect optical fibers wound around the first platform 122 and the second platform 132 to form an optical fiber cable.

[0058] In one embodiment, the optical fibers wound on the first platform 122 and the second platform 132 are both single-mode optical fibers, the optical fiber cables are multi-core single-mode optical fibers with a protective layer, and the optical fiber cables are connected to the connector 200, which has an LC interface that matches the number of cores in the optical fiber cables.

[0059] In this embodiment, the single-mode optical fiber has smaller inter-modal dispersion and loss, which can effectively improve the bandwidth and distance of signal transmission and ensure high-quality signal transmission. The multi-core single-mode optical fiber cable can transmit multiple signals at the same time, which improves the signal transmission capacity and efficiency of the system. The multi-core single-mode optical fiber cable with a protective layer improves the mechanical strength and environmental adaptability of the optical fiber, enhances the durability and reliability of the system, and the protective layer also provides additional electromagnetic shielding, reducing the impact of external interference on signal transmission. The high-bandwidth transmission capability of the single-mode optical fiber enables the sensor 100 to transmit and process high-frequency signals more accurately, thereby improving the detection accuracy of the system. The design of the multi-core single-mode optical fiber cable supports the synchronous transmission of multi-channel signals, further improving the effect of signal contrast and subtraction processing.

[0060] Connector 200 has an LC interface that matches the number of cores in the fiber optic cable. The LC interface is easy to plug and unplug and provides a stable connection, facilitating system integration and maintenance. The use of a standardized LC interface improves system compatibility and scalability, facilitating subsequent system upgrades and expansions.

[0061] See Figure 3 An embodiment of the present invention further provides a partial discharge detection system, comprising a plurality of the aforementioned partial discharge detection devices and a partial discharge detector 300 , wherein the plurality of partial discharge detection devices are respectively connected to the partial discharge detector 300 .

[0062] By installing multiple detection devices, a wider detection area can be covered, increasing the coverage of the detection system. Each detection device can independently detect partial discharge signals within its own range, enabling multi-point simultaneous monitoring. The partial discharge detector 300 receives the optical signals transmitted from the sensor 100, processes and analyzes the signals, and detects partial discharge events. In this embodiment, the partial discharge detector 300 centrally receives signals from multiple detection devices, compares and analyzes the signals from each device, and provides comprehensive partial discharge detection results. The design of multiple detection devices increases system redundancy. Even if a device fails, the others can still operate normally, ensuring system reliability. The number and placement of detection devices can be flexibly adjusted to meet actual detection needs, adapting to detection tasks of varying scale and complexity. The partial discharge detector 300 uniformly receives and processes signals from multiple detection devices, performing a comprehensive analysis of data from multiple signal sources. This allows for more accurate determination of the specific location and severity of partial discharge, improving the accuracy and reliability of detection results.

[0063] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above-described embodiments merely represent several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A partial discharge detection device, characterized in that: The partial discharge detection device comprises a sensor (100) and a connector (200), wherein the sensor (100) is used to connect to a test piece and obtain an acoustic wave signal generated by the test piece, and the connector (200) is connected to the sensor (100) to transmit the signal output by the sensor (100) to a partial discharge detector (300); The sensor (100) comprises a housing (110), a first light path (120), and a second light path (130); the first light path (120) and the second light path (130) are connected to the connector (200) via an optical fiber cable; and the housing (110) has a receiving cavity. The first optical path (120) is arranged in the accommodating cavity and is used to obtain the acoustic wave signal generated by the test piece and convert the acoustic wave signal into an optical signal for output; The second optical path (130) is arranged in the accommodating cavity and is used for providing and outputting a reference optical signal.

2. The partial discharge detection device according to claim 1, characterized in that: The sensor (100) further comprises a signal amplifying component (140), which is covered on the first optical path (120) and is used to collect and amplify the acoustic wave signal generated by the test piece for acquisition by the first optical path (120).

3. The partial discharge detection device according to claim 2, characterized in that: The housing (110) comprises a base plate (111) and a cover (112); the cover (112) is disposed on the base plate (111) and together with the base plate (111) encloses the accommodating cavity; The substrate (111) is used for adhering to the surface of the test piece, and the cover (112) is used for shielding interference.

4. The partial discharge detection device according to claim 3, characterized in that: The first light passage (120) and the second light passage (130) are respectively arranged on two opposite end surfaces in the accommodating cavity, wherein the first light passage (120) is arranged on the substrate (111), and the second light passage (130) is arranged on the cover (112).

5. The partial discharge detection device according to claim 4, characterized in that: The first optical path (120) comprises a first support member (121) and a first platform (122); the first platform (122) is connected to the substrate (111) via the first support member (121); and a first groove for winding an optical fiber is provided on the first platform (122); The second optical path (130) comprises a second support member (131) and a second platform (132); the second platform (132) is connected to the cover (112) via the second support member (131); and a second groove for winding an optical fiber is provided on the second platform (132).

6. The partial discharge detection device according to claim 5, characterized in that: The first support member (121) and the second support member (131) are of unequal lengths.

7. The partial discharge detection device according to claim 5, characterized in that: The sensor (100) further includes an output port (150), which is provided on the cover (112). The output port (150) is used to fixedly connect the optical fibers wound around the first platform (122) and the second platform (132) to form the optical fiber cable.

8. The partial discharge detection device according to claim 7, characterized in that: The optical fibers wound on the first platform (122) and the second platform (132) are both single-mode optical fibers. The optical fiber cable is a multi-core single-mode optical fiber with a protective layer. The optical fiber cable is connected to the connector (200). The connector (200) has an LC interface that matches the number of cores of the optical fiber cable.

9. The partial discharge detection device according to claim 5, characterized in that: The signal amplifying component (140) is a hemispherical structure made of metal; The substrate (111) is a substrate (111) made of plastic material, the cover (112) is a cover (112) made of metal material, and the first platform (122) and the second platform (132) are disc structures made of plastic material.

10. A partial discharge detection system, characterized in that: The invention comprises a plurality of partial discharge detection devices and a partial discharge detector (300) according to any one of claims 1 to 9, wherein the plurality of partial discharge detection devices are respectively connected to the partial discharge detector (300).

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