A transformer partial discharge monitoring device based on arc spectrum analysis

Abstract

The utility model discloses a transformer partial discharge monitoring devices based on arc spectrum analysis has energy quartz optical fiber, and one end of energy quartz optical fiber is sleeved with quartz sleeve, and the end of quartz sleeve is provided with focusing lens, and the other end of energy quartz optical fiber is connected with optical fiber flange through ceramic plug core, and the emergent light path of optical fiber flange is sequentially and interval provided with convex lens, visible light split prism and ultraviolet light split prism, and visible light split prism produces reflection to the visible light of 450~780nm wavelength, and ultraviolet light split prism produces reflection to the ultraviolet light of less than 280nm wavelength, and the reflection light path of visible light split prism is provided with silicon light detector, and the reflection light path of ultraviolet light split prism is provided with first ultraviolet light detector, and the transmission light path is provided with second ultraviolet light detector, and silicon light detector, first ultraviolet light detector and second ultraviolet light detector all are electrically connected with MCU through data acquisition card.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage electrical equipment condition monitoring technology, and in particular to a transformer partial discharge monitoring device based on arc light spectral analysis. Background Technology

[0002] High-voltage electrical equipment such as GIS and high-voltage transformers are core power transmission and transformation equipment in the power grid system. Real-time monitoring of their operating status is a key means to avoid equipment failures and prevent sudden power outages. Partial discharge is a core monitoring indicator that reflects internal insulation defects in high-voltage equipment and predicts equipment failures.

[0003] Traditional partial discharge detection methods in the industry mainly fall into two categories: ultrasonic detection and ultra-high frequency detection. Both are active measurement systems that convert discharge sound waves and electromagnetic waves into electrical signals through sensors, which are then transmitted via cables to analysis equipment for interpretation. These two active detection methods have the following technical drawbacks: the electrical signal transmission is highly susceptible to strong electromagnetic interference, significantly reducing detection accuracy; they require external power supply on-site, which is difficult to obtain in some GIS / DC / transformer installation areas; and the equipment has poor installation adaptability.

[0004] To overcome the aforementioned shortcomings of traditional technologies, there have been reports of passive partial discharge detection devices, such as the Chinese invention patent application CN202310962648.6, which discloses a passive partial discharge monitoring device. This device includes optical components such as a blue laser, a red beam splitter, and an ultraviolet beam splitter. It can detect partial discharge phenomena in high-voltage electrical equipment on locomotives without external power supply. However, it can only identify the presence and intensity of partial discharge, but cannot distinguish between different types of discharge, such as corona discharge, strong spark discharge, or discharge in oil. Maintenance personnel find it difficult to accurately determine the cause of equipment failure, making troubleshooting time-consuming, labor-intensive, and inefficient. Utility Model Content

[0005] This invention addresses the aforementioned shortcomings of existing technologies by proposing a transformer partial discharge monitoring device with strong anti-interference capabilities. This device can autonomously determine the type of partial discharge based on detection results, enabling maintenance personnel to quickly and accurately determine the cause of faults and improving maintenance efficiency.

[0006] The technical solution of this utility model is: a transformer partial discharge monitoring device based on arc light spectral analysis, comprising an energy quartz optical fiber, one end of which is sleeved with a quartz sleeve, the end of which is provided with a focusing lens, and the other end of which is connected to an optical fiber flange through a ceramic ferrule, characterized in that: A convex lens, a visible light beam splitter, and an ultraviolet light beam splitter are sequentially and spaced apart on the outgoing optical path of the fiber optic flange. The incident surface of the visible light beam splitter faces the exit surface of the convex lens, and the beams of the two are coupled to each other. The transmitted light of the ultraviolet light beam splitter and the visible light beam splitter are coaxial with the outgoing optical path of the fiber optic flange. The visible light beam splitter reflects visible light with a wavelength of 450~780nm, and the ultraviolet light beam splitter reflects ultraviolet light with a wavelength of less than 280nm. A silicon photodetector is provided on the reflected light path of the visible light beam splitter, and a first ultraviolet photodetector is provided on the reflected light path of the ultraviolet light beam splitter, and a second ultraviolet photodetector is provided on the transmitted light path; the silicon photodetector, the first ultraviolet photodetector, and the second ultraviolet photodetector are all electrically connected to the data acquisition card, and the data acquisition card is electrically connected to the MCU.

[0007] The focusing lens is made of quartz material and transmits light in the wavelength range of 200~780nm.

[0008] The energy-carrying quartz fiber has a diameter of 1-2 mm and transmits optical signals with a wavelength of 200-1200 nm.

[0009] The focal point of the focusing lens is located at the center of the end face of the energy quartz fiber.

[0010] Compared with the prior art, this utility model has the following advantages: 1. It adopts a passive optical front-end structure, which does not require on-site power supply. It is suitable for high-voltage equipment in remote areas or old substation renovation equipment and other scenarios without power supply. At the same time, the optical signal transmitted by the optical fiber is not subject to electromagnetic interference, which can completely solve the problem of poor anti-interference ability of electrical signal detection in traditional active monitoring equipment, and its detection accuracy is greatly improved. 2. By using two types of beam splitters (visible light beam splitter and ultraviolet light beam splitter) in combination, high-frequency acquisition of optical signals in various characteristic bands of 300-3000MHz can be achieved. The partial discharge arc light is split into three characteristic bands, which are matched with three fault types: corona discharge, strong spark discharge and oil discharge, respectively. This enables accurate classification of faults during the monitoring process, which is convenient for maintenance personnel to carry out targeted fault troubleshooting. 3. The equipment uses a single quartz optical fiber to complete the acquisition and transmission of optical signals across the entire band. It has a high degree of integration, small size, convenient installation, long service life and low cost. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0012] Energy quartz fiber 1, quartz sleeve 2, focusing lens 3, ceramic ferrule 4, fiber optic flange 5, convex lens 6, visible light beam splitter 7, ultraviolet light beam splitter 8, silicon photodetector 9, data acquisition card 10, first ultraviolet photodetector 11, second ultraviolet photodetector 12, MCU 13, optical substrate 14. Detailed Implementation

[0013] The specific embodiments of this utility model will be described below with reference to the accompanying drawings. Figure 1 As shown: A transformer partial discharge monitoring device based on arc light spectral analysis is provided with an energy quartz optical fiber 1. One end of the energy quartz optical fiber 1 is sleeved with a quartz sleeve 2. A focusing lens 3 is provided at the end of the quartz sleeve 2. The other end of the energy quartz optical fiber 1 is connected to the optical fiber flange 5 through a ceramic ferrule 4. A convex lens 6, a visible light beam splitter 7, and an ultraviolet light beam splitter 8 are sequentially and spaced apart on the outgoing optical path of the fiber optic flange 5. The incident surface of the visible light beam splitter 7 faces the exit surface of the convex lens 6, and the beams of the two are coupled to each other. The transmitted light of the ultraviolet light beam splitter 8 and the visible light beam splitter 7 is coaxial with the outgoing optical path of the fiber optic flange 5. The visible light beam splitter 7 reflects visible light with a wavelength of 450~780nm, and the ultraviolet light beam splitter 8 reflects ultraviolet light with a wavelength of less than 280nm. A silicon photodetector 9 is provided on the reflected light path of the visible light beam splitter 7, and a first ultraviolet photodetector 11 is provided on the reflected light path of the ultraviolet light beam splitter 8, and a second ultraviolet photodetector 12 is provided on the transmitted light path. The silicon photodetector 9, the first ultraviolet photodetector 11, and the second ultraviolet photodetector 12 are all electrically connected to the data acquisition card 10, and the data acquisition card 10 is electrically connected to the MCU 13.

[0014] The focusing lens 3 is made of quartz material and transmits light in the wavelength range of 200~780nm.

[0015] The energy quartz fiber 1 has a diameter of 1~2mm and transmits optical signals with a wavelength of 200~1200nm.

[0016] The focal point of the focusing lens 3 is located at the center of the end face of the energy quartz fiber 1.

[0017] The fiber optic flange 5, convex lens 6, visible light beam splitter 7, ultraviolet light beam splitter 8, silicon photodetector 9, first ultraviolet photodetector 11 and second ultraviolet photodetector 12 are all mounted on the optical substrate 14.

[0018] The working process of the transformer partial discharge monitoring device based on arc light spectral analysis of this utility model is as follows: When a partial discharge phenomenon occurs inside the transformer, the light signal generated by the arc discharge can be focused by the focusing lens 3 and coupled into the energy quartz fiber 1. Since the light signal generated by the arc discharge is usually very weak, the focal point of the focusing lens 3 is placed at the center of the end face of the energy quartz fiber 1, which can maximize the acquisition efficiency of the light signal. The optical signal is transmitted along the energy quartz fiber 1 and is shaped into a parallel beam by the convex lens 6 before being incident on the visible light beam splitter 7. Since the visible light beam splitter 7 reflects visible light with a wavelength of 450~780nm, the visible light with a wavelength of 450~780nm is reflected into the silicon photodetector 9 and photoelectric conversion is completed. The silicon photodetector 9 sends the electrical signal to the data acquisition card 10, while the ultraviolet light with a wavelength below 450nm passes through the visible light beam splitter 7 and is incident on the ultraviolet light beam splitter 8. The ultraviolet beam splitter 8 reflects ultraviolet light with wavelengths below 280nm to the first ultraviolet photodetector 11, while ultraviolet light with wavelengths in the range of 280~450nm passes through the ultraviolet beam splitter 8 and is incident on the second ultraviolet photodetector 12. After receiving the optical signal, the first ultraviolet photodetector 11 and the second ultraviolet photodetector 12 convert the optical signal into an electrical signal respectively, and send the electrical signal to the data acquisition card 10. The MCU13, which is electrically connected to the data acquisition card 10, can determine the type of fault of the partial discharge phenomenon currently generated inside the transformer by recognizing the above three signals: when the silicon photodetector 9 emits a signal, it indicates that the current fault is oil discharge (the wavelength range of the light signal emitted by oil discharge is 500~700nm); when the first ultraviolet photodetector 11 emits a signal, it indicates that the current fault is corona discharge (the wavelength range of the light signal emitted by corona discharge is 230~280nm); and when the second ultraviolet photodetector 12 emits a signal, it indicates that the current fault is spark / strong discharge (the wavelength range of the light signal emitted by spark / strong discharge is 280~400nm).

Claims

1. A transformer partial discharge monitoring device based on arc light spectral analysis, comprising an energy quartz optical fiber (1), one end of which is fitted with a quartz sleeve (2), the end of which is provided with a focusing lens (3), and the other end of which is connected to an optical fiber flange (5) via a ceramic ferrule (4), characterized in that: A convex lens (6), a visible light beam splitter (7), and an ultraviolet light beam splitter (8) are sequentially spaced along the outgoing optical path of the fiber optic flange (5). The incident surface of the visible light beam splitter (7) faces the exiting surface of the convex lens (6), and the two beams are coupled to each other. The transmitted light of the ultraviolet light beam splitter (8) and the visible light beam splitter (7) is coaxial with the outgoing optical path of the fiber optic flange (5). The visible light beam splitter (7) reflects visible light with a wavelength of 450~780nm, and the ultraviolet light beam splitter (8) reflects ultraviolet light with a wavelength of less than 280nm. A silicon photodetector (9) is provided on the reflected light path of the visible light beam splitter (7), and a first ultraviolet photodetector (11) is provided on the reflected light path of the ultraviolet light beam splitter (8), and a second ultraviolet photodetector (12) is provided on the transmitted light path. The silicon photodetector (9), the first ultraviolet photodetector (11), and the second ultraviolet photodetector (12) are all electrically connected to the data acquisition card (10), and the data acquisition card (10) is electrically connected to the MCU (13).

2. The transformer partial discharge monitoring device based on arc light spectral analysis according to claim 1, characterized in that: The focusing lens (3) is made of quartz material and transmits light in the range of 200~780nm.

3. The transformer partial discharge monitoring device based on arc light spectral analysis according to claim 2, characterized in that: The energy quartz optical fiber (1) has a diameter of 1~2mm and transmits optical signals with a wavelength of 200~1200nm.

4. The transformer partial discharge monitoring device based on arc light spectral analysis according to claim 1 or 2, characterized in that: The focal point of the focusing lens (3) is located at the center of the end face of the energy quartz fiber (1).

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