High-voltage transmission line joint simulation integration box and simulation system thereof

Abstract

The utility model relates to a high-voltage transmission line joint simulation integration box and a simulation system thereof, and relates to the technical field of power line simulation, and the high-voltage transmission line joint simulation integration box comprises an insulation housing, an intermediate joint module, a high-frequency partial discharge detection module and a signal injection module. Wherein the intermediate joint module, the high-frequency partial discharge detection module and the signal injection module are all arranged in the insulating shell; the intermediate joint module is electrically connected with the high-voltage power transmission line and the grounding box outside the insulating shell and is used for simulating an intermediate joint of the high-voltage power transmission line; the high-frequency partial discharge detection module is electrically connected with a partial discharge detection positioning device outside the insulating shell and is used for detecting a simulation signal; and the signal injection module is electrically connected with a composite signal simulation generation device outside the insulating shell and is used for injecting a simulated high-voltage transmission line partial discharge signal. According to the invention, the integration level of the analog simulation line for the high-voltage transmission line joint can be improved.

Description

Technical Field

[0001] This application relates to the field of power line simulation technology, and in particular to a high-voltage transmission line joint simulation integration box and its simulation system. Background Technology

[0002] Partial discharge (PD) detection is an effective method for predicting insulation defects in high-voltage transmission lines. Detection and location of PD in high-voltage transmission lines is a highly technical task; therefore, the promotion of PD detection and location technologies for high-voltage transmission lines is crucial. However, in related technologies, physical 110kV and 10kV cables have large diameters, especially 110kV cables. When used as simulated high-voltage transmission line joints, their integration is low, they occupy a large amount of space, have high site requirements, and are difficult to move, making it difficult to meet the needs of promoting PD detection and location technologies for high-voltage transmission lines. Therefore, current simulation lines for high-voltage transmission line joints suffer from low integration. Utility Model Content

[0003] Therefore, it is necessary to address the issue of low integration in current simulations of high-voltage transmission line joints by providing a high-voltage transmission line joint simulation integration box and its simulation system.

[0004] In a first aspect, this application provides a high-voltage transmission line joint simulation integrated box, including: an insulating shell, an intermediate joint module, a high-frequency partial discharge detection module, and a signal injection module;

[0005] The intermediate connector module, the high-frequency partial discharge detection module, and the signal injection module are all located inside the insulating housing.

[0006] The intermediate joint module is electrically connected to the high-voltage transmission line and grounding box outside the insulating shell, and is used to simulate the intermediate joint of the high-voltage transmission line.

[0007] The high-frequency partial discharge detection module is electrically connected to the partial discharge detection positioning device outside the insulating shell and is used to detect the simulated signal;

[0008] The signal injection module is electrically connected to the composite signal simulation generator outside the insulating shell, and is used to inject simulated partial discharge signals of high-voltage transmission lines.

[0009] In one embodiment, the intermediate connector module includes three coaxial signal shielding wires and three coaxial branch grounding leads;

[0010] Both ends of each coaxial signal shielding wire are electrically connected to the two corresponding high-voltage transmission lines outside the insulating housing; each coaxial signal shielding wire includes a first shielding sleeve cutting point, a second shielding sleeve cutting point, and a third shielding sleeve cutting point arranged in sequence; one end of each coaxial branch grounding lead is electrically connected to the grounding box outside the insulating housing, and the corresponding core conductor and braided shield at the other end are respectively connected to the two ends of the braided shield after being cut at the second shielding sleeve cutting point.

[0011] In one embodiment, the intermediate connector module further includes three pairs of aluminum foil electrodes;

[0012] One of the aluminum foil electrodes in each pair is disposed between the first shielding sleeve cut point and the second shielding sleeve cut point of the corresponding coaxial signal shielding line, and the other aluminum foil electrode is disposed between the second shielding sleeve cut point and the third shielding sleeve cut point of the coaxial signal shielding line.

[0013] In one embodiment, the high-frequency partial discharge detection module includes three signal detection transmission lines and three high-frequency partial discharge sensors;

[0014] One end of each signal detection transmission line is connected to a corresponding high-frequency partial discharge sensor; the high-frequency partial discharge sensor is sleeved in a corresponding coaxial branch grounding lead, on the conductor of the core near the cutting point of the second shielding sleeve; the other end of the signal detection transmission line is electrically connected to the partial discharge detection and positioning device outside the insulating housing.

[0015] In one embodiment, the signal detection transmission line is used to connect to the partial discharge detection and positioning device, which includes a partial discharge detection device, an oscilloscope, and a spectrum analyzer, located outside the insulating housing.

[0016] In one embodiment, the signal injection module includes six direct signal injection leads;

[0017] The conductor at one end of each of the two signal direct injection leads is electrically connected to the conductor at the first shielding sleeve cutting point and the conductor at the third shielding sleeve cutting point of the same coaxial signal shielding line, respectively.

[0018] The braided shield at one end of each of the two signal direct injection leads is electrically connected to the braided shield at the first shielding sleeve cutting point and the braided shield at the third shielding sleeve cutting point of the same coaxial signal shielding line.

[0019] The other end of the six signal direct injection leads is electrically connected to the composite signal simulation generator outside the insulating housing.

[0020] In one embodiment, the signal injection module further includes three signal indirect injection leads;

[0021] One end of each of the signal indirect injection leads is electrically connected to the braided shield and core conductor of the corresponding coaxial signal shield wire, respectively, and the other end is electrically connected to the composite signal simulation generator outside the insulating housing.

[0022] In one embodiment, the intermediate connector module includes a coaxial signal shielding wire and a coaxial branch grounding lead; the signal injection module includes a direct signal injection lead and a direct signal injection lead; and the high-frequency partial discharge detection module includes a signal detection transmission line.

[0023] Among them, any one of the coaxial signal shielding wire, the coaxial branch grounding lead, the signal direct injection lead, the signal indirect injection lead, and the signal detection transmission line has a BNC coaxial connector at one end extending outside the insulating shell.

[0024] Secondly, this application provides a simulation system for a high-voltage transmission line joint simulation integrated box, the system including a partial discharge detection and positioning device, a composite signal simulation generator, a grounding box, and a high-voltage transmission line joint device; wherein, the high-voltage transmission line joint device includes at least one high-voltage transmission line joint simulation integrated box as described in any one of the above embodiments;

[0025] The high-voltage transmission line connector is electrically connected to the partial discharge detection and positioning device, the composite signal simulation generator and the grounding box, respectively, and the high-voltage transmission line connector is electrically connected to the GIS cable terminal and outdoor terminal outside the system, respectively.

[0026] In one embodiment, the system further includes a first terminal and a second terminal;

[0027] The first terminal is wirelessly connected to the composite signal simulation generator and is used to control the composite signal simulation generator to inject simulated high-voltage transmission line partial discharge signals into the high-voltage transmission line joint device; the second terminal is wirelessly connected to the partial discharge detection and positioning device and is used to acquire and display the detection simulation signals collected by the partial discharge detection and positioning device.

[0028] The aforementioned high-voltage transmission line joint simulation integrated box and its simulation system include an insulating shell, an intermediate joint module, a high-frequency partial discharge detection module, and a signal injection module. The intermediate joint module, high-frequency partial discharge detection module, and signal injection module are all housed inside the insulating shell. The intermediate joint module is electrically connected to the high-voltage transmission line and grounding box outside the insulating shell to simulate the intermediate joint of the high-voltage transmission line. The high-frequency partial discharge detection module is electrically connected to a partial discharge detection and positioning device outside the insulating shell to detect the simulated signal. The signal injection module is electrically connected to a composite signal simulation generator outside the insulating shell to inject simulated partial discharge signals from the high-voltage transmission line. By integrating the intermediate joint module, high-frequency partial discharge detection module, and signal injection module within the insulating shell, the circuit structure of the intermediate joint of the high-voltage transmission line is simulated, improving the integration level of the simulation circuit for high-voltage transmission line joints. Furthermore, the integrated box can detect the simulated partial discharge signals of the high-voltage transmission line, facilitating the understanding of partial discharge detection and positioning technology for high-voltage transmission lines by personnel. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a high-voltage transmission line connector simulation integrated box in one embodiment;

[0030] Figure 2 This is a schematic diagram of the structure of a high-voltage transmission line connector simulation integrated box in another embodiment;

[0031] Figure 3 This is a schematic diagram of the connection structure of an indirect injection correction method for a high-voltage transmission line intermediate joint in one embodiment;

[0032] Figure 4 This is a schematic diagram of the external structure of a high-voltage transmission line connector simulation integrated box in one embodiment;

[0033] Figure 5 This is a schematic diagram of the internal wiring model of a high-voltage transmission line joint simulation integrated box in one embodiment;

[0034] Figure 6 This is a schematic diagram of the simulation system of a high-voltage transmission line joint simulation integration box in one embodiment;

[0035] Figure 7 This is a schematic diagram of the simulation system structure of the high-voltage transmission line joint simulation integration box in another embodiment;

[0036] Figure 8 This is a schematic diagram of the structure of a high-voltage transmission line connector simulation integrated box in another embodiment. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0038] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0041] As mentioned in the background section, the simulation circuits for high-voltage transmission line joints in related technologies suffer from low integration. The inventors discovered that this problem arises because partial discharge detection is an effective means of predicting insulation defects in high-voltage transmission lines. Partial discharge detection and location in high-voltage transmission lines is a highly technical task, requiring testers to master sensor selection and installation, accurately identify partial discharge signals, and locate the defect based on waveform analysis. Training a qualified cable partial discharge tester requires a long period and sufficient field testing experience. However, the probability of partial discharge occurring or existing in operating high-voltage transmission lines is extremely low, with a detection rate of <1 / 1000 in general testing. The chances of detecting partial discharge in cables during actual testing are very rare. Simply relying on successful cases and experience accumulation is insufficient to effectively improve the partial discharge detection skills of testers and hinder the popularization and development of partial discharge detection technology. Furthermore, skills training for operating high-voltage transmission lines in energized environments is limited by safety and operating conditions, making it difficult to conduct sufficient practical exercises. This results in slow experience accumulation and significant obstacles to skill improvement for operators. High-voltage cable joints are the core "joints" of high-voltage transmission line systems. They connect to the cables at both ends and are linked to a grounding box for reliable grounding protection. Multiple interconnected sections, along with joints and terminals, combine to form a complete high-voltage transmission line system. Therefore, developing a multifunctional, miniaturized simulated high-voltage cable joint box is crucial for assembling a high-voltage transmission line model used in technical training. Early methods relied heavily on accumulated experience from operating high-voltage transmission lines in real-world environments, involving technicians conducting on-site measurements and handling actual, installed ultra-high-voltage transmission line joints. While this "hands-on" learning allowed for a real understanding of high-voltage transmission line joint morphology, it was risky, limited in practical application, and only allowed for simple observation and learning, not in-depth study. To overcome this bottleneck, professional training bases were established. These bases invested heavily in laying hundreds of meters of 110kV cross-linked polyethylene high-voltage transmission lines, cutting 110kV cables to create joints, simulating real cable interconnection layouts, and adding defect simulation points, allowing trainees to safely and systematically practice partial discharge detection. Later, it evolved into a laboratory method where a section of 10kV single-core cross-linked cable was cut and separated from its metal sheath and main insulation to form a cable metal sheath insulation joint, thus creating a training model of a 10kV high-voltage transmission line. However, all of these technologies suffer from problems such as low integration, large space requirements, difficult and time-consuming manufacturing processes, low operability, high costs, and difficulty in large-scale promotion.

[0042] For the reasons mentioned above, this application provides a high-voltage transmission line joint simulation integration box and its simulation system, which aims to improve the integration of simulation lines for high-voltage transmission line joints.

[0043] See Figure 1 , Figure 1 The diagram shows a structural schematic of a high-voltage transmission line joint simulation integrated box according to an embodiment of the present application. The high-voltage transmission line joint simulation integrated box provided in an embodiment of the present application includes an insulating shell 11, an intermediate joint module 12, a high-frequency partial discharge detection module 13, and a signal injection module 14.

[0044] The intermediate joint module 12, the high-frequency partial discharge detection module 13, and the signal injection module 14 are all located inside the insulating shell. The intermediate joint module 12 is electrically connected to the high-voltage transmission line and grounding box outside the insulating shell 11 to simulate the intermediate joint of the high-voltage transmission line. The high-frequency partial discharge detection module 13 is electrically connected to the partial discharge detection and positioning device outside the insulating shell 11 to detect the simulated signal. The signal injection module 14 is electrically connected to the composite signal simulation generator outside the insulating shell 11 to inject the simulated partial discharge signal of the high-voltage transmission line.

[0045] It should be noted that the insulating housing 11 is made of rigid insulating material, such as epoxy resin or polycarbonate. The insulating housing 11 can be polyhedral in shape, and channels are provided on the housing to facilitate the wiring of the intermediate connector module 12, the high-frequency partial discharge detection module 13, and the signal injection module 14 to pass through the housing and connect to external devices. The intermediate connector module 12, the high-frequency partial discharge detection module 13, and the signal injection module 14 include multiple lines, integrated and laid inside the insulating housing 11. The wiring and connection methods of the intermediate connector module 12 and the signal injection module 14 are set according to the circuit principle of the intermediate connector of a high-voltage transmission line, so as to realize the simulation of the intermediate connector of a high-voltage transmission line through the high-voltage transmission line connector simulation integrated box, which facilitates the promotion of partial discharge detection and location technology of high-voltage transmission lines.

[0046] Understandably, the intermediate joint module 12 is connected to the high-voltage transmission line and grounding box outside the insulating housing 11, simulating the electrical connection method of the intermediate joint of the actual high-voltage transmission line. The high-frequency partial discharge detection module 13 can detect the simulation signal inside the high-voltage transmission line joint simulation integration box, thereby enabling real-time monitoring of the partial discharge detection data of the high-voltage transmission line. The signal injection module 14 simulates the injection of partial discharge signals into the intermediate joint of the high-voltage transmission line. The partial discharge signal can be generated by controlling the composite signal simulation generator according to the actual detection requirements. It can simulate and output various single or complex combination signals, and the simulated signals are comprehensive and diverse, thus obtaining more comprehensive simulation signal data.

[0047] The aforementioned high-voltage transmission line joint simulation integrated box includes an insulating housing 11, an intermediate joint module 12, a high-frequency partial discharge detection module 13, and a signal injection module 14. The intermediate joint module 12, the high-frequency partial discharge detection module 13, and the signal injection module 14 are all housed inside the insulating housing. The intermediate joint module 12 is electrically connected to the high-voltage transmission line and grounding box outside the insulating housing 11 to simulate the intermediate joint of the high-voltage transmission line. The high-frequency partial discharge detection module 13 is electrically connected to a partial discharge detection and positioning device outside the insulating housing 11 to detect the simulated signal. The signal injection module 14... The input module 14 is electrically connected to the composite signal simulation generator outside the insulating housing 11. It is used to inject simulated partial discharge signals of high-voltage transmission lines. Through the intermediate joint module 12, high-frequency partial discharge detection module 13 and signal injection module 14 integrated in the insulating housing 11, the circuit structure of the intermediate joint of the high-voltage transmission line is simulated. This improves the integration of the simulation circuit for high-voltage transmission line joints. Furthermore, the simulated partial discharge signal of the high-voltage transmission line can be detected through this integrated box, which facilitates the understanding of the partial discharge detection and location technology of high-voltage transmission lines by the staff.

[0048] Combination Figure 2 As shown, Figure 2 A schematic diagram of the structure of a high-voltage transmission line joint simulation integrated box is shown in another embodiment of this application. In some embodiments, the intermediate joint module 12 includes three coaxial signal shielding lines 121 and three coaxial branch grounding leads 122.

[0049] Both ends of each coaxial signal shield 121 are electrically connected to two corresponding high-voltage transmission lines outside the insulating housing 11. Each coaxial signal shield 121 includes a first shield cut point 1214, a second shield cut point 1215, and a third shield cut point 1216 arranged in sequence. One end of each coaxial branch grounding lead 122 is electrically connected to the grounding box outside the insulating housing 11, and the corresponding conductor and braided shield at the other end are connected to both ends of the braided shield after being cut at the second shield cut point 1215.

[0050] Among them, the coaxial signal shielding wire 121 can be a SYV coaxial radio frequency signal shielding wire. The wave velocity of the SYV coaxial radio frequency signal shielding wire (200 m / μs) is different from that of the high-voltage cross-linked polyethylene cable (170 m / μs), but the waveform characteristics of the partial discharge signal after transmission are the same, and the waveform characteristics do not change after transmission; the PRPD (Phase Resolved Partial Discharge) spectrum characteristics of the partial discharge signal also do not change after transmission. Using the coaxial radio frequency signal shielding wire to simulate the power cable for partial discharge observation is effective.

[0051] It is understood that the three coaxial branch grounding leads 122 are three coaxial branch grounding leads 122, including coaxial branch grounding lead A 1221, coaxial branch grounding lead B 1222 and coaxial branch grounding lead C 1223.

[0052] It should be noted that the two ends of the three coaxial signal shielding wires 121 of the intermediate connector module 12 extend from channels on the two side surfaces of the insulating housing 11, respectively, serving as connecting leads for connection to high-voltage transmission lines. The two ends of the first coaxial signal shielding wire 1211 are connected to the high-voltage transmission line outside the insulating housing and the high-voltage transmission line corresponding to the first coaxial signal shielding wire 1211, respectively. The two ends of the second coaxial signal shielding wire 1212 are connected to the high-voltage transmission line outside the insulating housing and the high-voltage transmission line corresponding to the second coaxial signal shielding wire 1212, respectively. The two ends of the third coaxial signal shielding wire 1213 are connected to the high-voltage transmission line outside the insulating housing and the high-voltage transmission line corresponding to the third coaxial signal shielding wire 1213, respectively. The coaxial signal shielding wire 121 mainly consists of a conductor core, an insulating layer, a shielding layer, and an outer insulating layer. The shielding layer of the coaxial signal shielding wire 121 is cut at the first shielding cut point 1214, the second shielding cut point 1215, and the third shielding cut point 1216. This means the conductor core and shielding layer of the coaxial signal shielding wire 121 are separated. The shielding layer can be a copper wire braided shielding mesh, corresponding to the braided shielding in this embodiment. Furthermore, the braided shielding at the second shielding cut point is cut into two ends. One end of each coaxial branch grounding lead 122 extends to connect to the grounding box outside the insulating housing 11, and the other end is also cut. Therefore, the conductor core and braided shielding at the other end are respectively connected to the two ends of the braided shielding at the second shielding cut point of the corresponding coaxial signal shielding wire 121. This wiring method can simulate the grounding of the shielding layer of an actual high-voltage transmission line intermediate joint and simulates the function of the intermediate joint as a connector for high-voltage transmission lines.

[0053] Continue reading Figure 2 In one embodiment, the intermediate connector module 12 further includes three pairs of aluminum foil electrodes 123;

[0054] One aluminum foil electrode in each pair of aluminum foil electrodes 123 is disposed around the first shielding sleeve cutting point 1214 and the second shielding sleeve cutting point 1215 of the corresponding coaxial signal shielding line 121, and the other aluminum foil electrode is disposed around the second shielding sleeve cutting point 1215 and the third shielding sleeve cutting point 1216 of the coaxial signal shielding line 121.

[0055] It should be noted that the aluminum foil electrode 123 is wrapped around the surface of the coaxial signal shielding wire 121, and a metal ring is provided in the middle of the aluminum foil electrode 123 for connecting other circuit structures. The thin design of the aluminum foil allows for more electrode connections in a smaller space, further improving the integration of the circuit in the high-voltage transmission line connector simulation integration box. In addition, aluminum has good conductivity, which can effectively transmit current and reduce energy loss. It is also lighter than other metals, thereby reducing the weight of the high-voltage transmission line connector simulation integration box, facilitating the movement of the integration box, and thus improving the convenience of using the integration box for training and promotion of high-voltage transmission line partial discharge detection and positioning technology.

[0056] Continue reading Figure 2 In one embodiment, the high-frequency partial discharge detection module 13 includes three signal detection transmission lines 131 and three high-frequency partial discharge sensors 132;

[0057] One end of each signal detection transmission line 131 is connected to a corresponding high-frequency partial discharge sensor 132; the high-frequency partial discharge sensor 132 is sleeved in a corresponding coaxial branch grounding lead 122, on the conductor of the core near the second shielding sleeve cutting point 1215; the other end of the signal detection transmission line 131 is electrically connected to the partial discharge detection and positioning device outside the insulating housing 11.

[0058] It should be noted that each signal detection transmission line 131 is connected to a high-frequency partial discharge sensor 132, and each high-frequency partial discharge sensor corresponds to a coaxial branch grounding lead 122. The high-frequency partial discharge sensor 132 can be a small high-frequency partial discharge sensor with extremely miniaturized specifications. Its dimensions are 12mm outer diameter, 8mm inner diameter, and 8mm thickness. Moreover, the sensor's detection frequency is as high as 100MHz or more, with a wide detection frequency range and high sensitivity. Specifically, the three signal detection transmission lines 131 include a first signal detection transmission line 1311, a second signal detection transmission line 1312, and a third signal detection transmission line 1313. One end of the first signal detection transmission line 1311 is electrically connected to a high-frequency partial discharge sensor 132 on the conductor of the first coaxial branch grounding line 1221, near the end of the second shielding sleeve cutting point 1215. One end of the second signal detection transmission line 1312 is electrically connected to a high-frequency partial discharge sensor 132 on the conductor of the second coaxial branch grounding line 1222, near the end of the second shielding sleeve cutting point 1215. One end of the third signal detection transmission line 1313 is electrically connected to a high-frequency partial discharge sensor 132 on the conductor of the third coaxial branch grounding line, near the end of the second shielding sleeve cutting point 1215.

[0059] In one embodiment, the signal detection transmission line 131 is used to connect to the partial discharge detection and positioning device, which includes a partial discharge detection device, an oscilloscope, and a spectrum analyzer, located outside the insulating housing 11.

[0060] Understandably, partial discharge (PD) detection devices are primarily used to detect partial discharge phenomena in electrical equipment (such as transformers and cables). By monitoring parameters such as voltage, current, ultrasonic waves, or optical signals, these devices can promptly identify the occurrence of PD and analyze its characteristics for appropriate maintenance and repair. Oscilloscopes can detect the transient voltage or current waveforms generated by PD signals, determining information such as the amplitude, duration, and frequency of the PD signal. Spectrum analyzers can convert time-domain signals into frequency-domain signals, displaying the frequency components of the PD signal, which helps identify the characteristic frequencies and harmonics of the PD. PD detection and location devices include multi-dimensional detection instruments that can acquire multi-dimensional information about simulated PD signals from high-voltage transmission lines, facilitating a better understanding of the characteristics of PD signals by personnel and thus promoting PD detection and location technology for high-voltage transmission lines.

[0061] Continue reading Figure 2 In one embodiment, the signal injection module 14 includes six direct signal injection leads 141;

[0062] The conductor at one end of each pair of signal direct injection leads 141 is electrically connected to the conductor at the first shielding sleeve cutting point 1214 and the conductor at the third shielding sleeve cutting point 1216 of the same coaxial signal shielding wire 121, respectively; the braided shield at one end of each pair of signal direct injection leads 141 is electrically connected to the braided shield at the first shielding sleeve cutting point 1214 and the braided shield at the third shielding sleeve cutting point 1216 of the same coaxial signal shielding wire 121, respectively; the other end of the six signal direct injection leads 141 is electrically connected to the composite signal simulation generator outside the insulating housing 11.

[0063] It should be noted that one end of each signal direct injection lead 141 is also braided and shielded, and every two signal direct injection leads 141 correspond to the same coaxial signal shield. In every two signal direct injection leads, the conductor of the braided and shielded end of one signal direct injection lead 141 is electrically connected to the conductor of the first shield cut point 1214 of the corresponding coaxial signal shield, and the conductor of the braided and shielded end of the other signal direct injection lead 141 is electrically connected to the conductor of the third shield cut point 1216 of the corresponding coaxial signal shield. Similarly, in every two signal direct injection leads, the braided shield of the braided and shielded end of one signal direct injection lead is electrically connected to the braided shield of the first shield cut point 1214 of the corresponding coaxial signal shield, and the braided shield of the braided and shielded end of the other signal direct injection lead 141 is electrically connected to the braided shield of the third shield cut point 1216 of the corresponding coaxial signal shield. The above connection method can precisely control the signal injection path and avoid signal leakage or crosstalk. Of the six direct signal injection leads 141, three are connected to the first shielding sleeve cutting point 1214 to simulate partial discharge signals occurring at either the left or right end of the three-phase cable joint. The other three are connected to the third shielding sleeve cutting point 1216 to simulate the partial discharge signal occurring at the other end of the three-phase cable joint. By dividing the six leads into two groups to simulate the left and right ends of the three-phase cable joint respectively, all possible sources of partial discharge signals from the cable joint can be comprehensively covered, ensuring the comprehensiveness of the simulation. Furthermore, it can clearly distinguish whether the partial discharge signal comes from the left or right end of the cable, facilitating subsequent analysis and fault location. Users can select to simulate the partial discharge signal from the left or right end as needed, enhancing the flexibility and applicability of the simulation experiment.

[0064] Furthermore, the composite signal simulation generator employs a direct injection method to inject signals into the coaxial signal shielding wire 121. The simulated partial discharge signal is directly injected between the conductor core and the braided shield of the three coaxial signal shielding wires 121 in the high-voltage transmission line connector simulation integration box, simulating partial discharge in the high-voltage transmission line. This method is called the direct injection method. The direct injection method injects the simulated partial discharge signal directly between the conductor core and the braided shield, allowing for precise control of the signal strength and frequency, ensuring consistency between the simulated signal and the actual partial discharge signal. In addition, the direct injection method reduces signal attenuation in the transmission path, ensuring that the injected signal strength is sufficiently large to effectively simulate partial discharge phenomena in high-voltage transmission lines.

[0065] See Figure 2 and Figure 3 , Figure 3This is a schematic diagram of the connection structure of an indirect injection correction method for intermediate joints of high-voltage transmission lines in one embodiment. In one embodiment, the signal injection module 14 further includes three signal indirect injection leads 142.

[0066] In each signal indirect injection lead 142, one end of the braided shield and the core conductor are electrically connected to the two aluminum foil electrodes 123 of the corresponding coaxial signal shield 121, and the other end is electrically connected to the composite signal simulation generator outside the insulating housing 11.

[0067] It should be noted that the braided shield at one end of each signal indirect injection lead 142 is electrically connected to the metal ring in the middle of one of the aluminum foil electrodes 123 of the corresponding coaxial signal shield 121, and the conductor at one end of the signal indirect injection lead 142 is electrically connected to the metal ring of the other aluminum foil electrode 123 of the coaxial signal shield 121. Specifically, one end of the first signal indirect injection lead, corresponding to the braided shield and conductor, is electrically connected to the two aluminum foil electrodes 123 of the corresponding first coaxial signal shield 1211, and the other end is electrically connected to the composite signal simulation generator outside the insulating shell 11. Similarly, one end of the second signal indirect injection lead, corresponding to the braided shield and conductor, is electrically connected to the two aluminum foil electrodes 123 of the corresponding second coaxial signal shield 1212, and the other end is electrically connected to the composite signal simulation generator outside the insulating shell 11. Likewise, one end of the third signal indirect injection lead, corresponding to the braided shield and conductor, is electrically connected to the two aluminum foil electrodes 123 of the corresponding third coaxial signal shield 1213, and the other end is electrically connected to the composite signal simulation generator outside the insulating shell 11. In actual testing, under the operating conditions of the high-voltage transmission line, only indirect coupling injection signals can be used for the calibration of the detection system and the comparative evaluation of the detection signals. The indirect injection calibration method for the intermediate joint of the operating high-voltage transmission line involves injecting a simulated partial discharge pulse signal onto the metal shields on both sides of the cable joint insulation ring through a pair of coupling capacitors. Figure 3In this simulation, a composite signal generator sends a simulated partial discharge (PD) pulse signal to the metal foil electrode of the intermediate joint of the high-voltage cable to achieve indirect injection. The output waveform ratio of the indirect injection method to the direct injection method is 2:1, and the correction correspondence is "injection 1 equals PD 2". For example, when indirectly injecting 10pC of simulated PD signal for correction, it is equivalent to PD occurring at 20pC. The actual discharge amount at the PD point can be calculated and evaluated by indirect injection correction and the apparent magnitude of the PD signal measured by the sensor. The line layout corresponding to the two signal injection methods is integrated into the signal injection module 14 of the high-voltage transmission line joint simulation integration box. This can comprehensively simulate the propagation mechanism of partial discharge and PD signals in high-voltage transmission lines, enhancing the comprehensiveness of the simulation and meeting different simulation needs. The indirect injection method can also more closely resemble the actual operating environment, improving the reliability and practicality of the simulation results.

[0068] See Figure 4 and Figure 5 , Figure 4 A schematic diagram of the external structure of a high-voltage transmission line connector simulation integrated box is provided. Figure 5 A schematic diagram of the internal wiring model of a high-voltage transmission line joint simulation integrated box is provided. In one embodiment, the intermediate joint module 12 includes a coaxial signal shielding wire and a coaxial branch grounding lead; the signal injection module 14 includes a direct signal injection lead and a direct signal injection lead; and the high-frequency partial discharge detection module 13 is a signal detection transmission line. Any one of the coaxial signal shielding wire, coaxial branch grounding lead, direct signal injection lead, indirect signal injection lead, and signal detection transmission line has a BNC coaxial connector 41 at one end extending outside the insulating housing 11.

[0069] It should be noted that the traces of the intermediate connector module 12, the high-frequency partial discharge detection module 13, and the signal injection module 14, including coaxial signal shielded wires, coaxial branch grounding leads, direct signal injection leads, indirect signal injection leads, and signal detection transmission lines, extend out of the insulating housing 11 through channels on the insulating housing 11. A BNC (Bayonet Neill-Concelman) coaxial connector is provided at one end of each trace extending out of the insulating housing 11, facilitating quick connection and disconnection with the high-voltage transmission line connector simulation integration box and various point devices, thereby improving the efficiency of simulation experiments. Furthermore, the BNC coaxial connector 41 possesses advantages such as excellent shielding performance, strong compatibility, support for high-frequency signal transmission, and high mechanical stability. Moreover, the BNC coaxial connector 41 enables a modular design of the high-voltage transmission line connector simulation integration box, allowing users to flexibly adjust the lead length or type according to experimental needs, and... Figure 4The lead wires do not need to extend outside the insulating housing 11. The internal lead wires are connected to BNC connectors, which are set on the insulating housing 11, further improving the integration of the high-voltage transmission line connector simulation integrated box.

[0070] See Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the simulation system of a high-voltage transmission line joint simulation integration box in one embodiment. Figure 7 In another embodiment, the simulation system for the high-voltage transmission line joint simulation integration box includes:

[0071] The system includes a partial discharge detection and location device 601, a composite signal simulation generator 602, a grounding box 603, and a high-voltage transmission line connector device 604; wherein, the high-voltage transmission line connector device 604 includes at least one high-voltage transmission line connector simulation integrated box as described in any of the above embodiments; the high-voltage transmission line connector device 604 is electrically connected to the partial discharge detection and location device 601, the composite signal simulation generator 602, and the grounding box 603 respectively, and the high-voltage transmission line connector device 604 is electrically connected to the GIS cable terminal and outdoor terminal outside the system respectively.

[0072] For example, such as Figure 6 The connection method in the system includes three high-voltage transmission line joint simulation integrated boxes in the high-voltage transmission line joint device 604. The system may also include at least one cross-connection box, which can be used to assist in grounding the high-voltage transmission line joint simulation integrated boxes. The partial discharge detection and positioning device 601 and the composite signal simulation generator 602 are respectively connected to the high-frequency partial discharge detection module 13 and signal injection module 14 of the same high-voltage transmission line joint simulation integrated box. The intermediate joint module 12 of the first high-voltage transmission line joint simulation integrated box is connected to a cross-connection box, the intermediate joint module 12 of the second high-voltage transmission line joint simulation integrated box, and the GIS (Gas Insulated Switchgear Cable Termination) cable terminal outside the system. The intermediate joint module 12 of the second high-voltage transmission line joint simulation integrated box is connected to another cross-connection box and the intermediate joint module 12 of the third high-voltage transmission line joint simulation integrated box. The intermediate joint module 12 of the third high-voltage transmission line joint simulation integrated box is connected to the grounding box 603 and the outdoor terminal outside the system. Figure 7In the connection method described, the partial discharge detection and location device is electrically connected to the high-voltage transmission line connector simulation integrated box via a cross-connection box, and the composite signal simulation generator 602 is also electrically connected to the same high-voltage transmission line connector simulation integrated box as the partial discharge detection and location device. Both connection methods can realize experiments simulating partial discharge in high-voltage transmission lines or simulating partial discharge hidden in complex environmental noise.

[0073] Continue reading Figure 6 and Figure 7 In one embodiment, the simulation system of the high-voltage transmission line joint simulation integration box further includes a first terminal 605 and a second terminal 606.

[0074] The first terminal 605 is wirelessly connected to the composite signal simulation generator 602 and is used to control the composite signal simulation generator 602 to inject simulated high-voltage transmission line partial discharge signals into the high-voltage transmission line joint device 604; the second terminal 606 is wirelessly connected to the partial discharge detection and positioning device and is used to acquire and display the detection simulation signals collected by the partial discharge detection and positioning device.

[0075] The wireless communication method can be local area network communication or Bluetooth communication, etc.

[0076] It should be noted that the first terminal 605 corresponds to Figure 6 or Figure 7 The tablet computer in the middle, the second terminal 606 corresponds to Figure 6 or Figure 7 The data analysis and display terminal. In scenarios where technicians conduct competitions or training, the first terminal 605 is used for training instructors or referees, and the second terminal 606 is used for trainees or participants. Figure 6 In the application scenario of this structure, the three high-voltage transmission line joint simulation integration boxes in the middle are connected by tens or hundreds of meters of coaxial radio frequency signal shielded cable. Both ends of the cable are connected to cable terminals, and each high-voltage transmission line joint simulation integration box is connected to a grounding box to form a cross-interconnected grounding system, thus constituting a complete high-voltage transmission line model. The training instructor uses a composite signal simulation generator 602 to directly or indirectly inject simulated signals into any cable joint, simulating partial discharge in the high-voltage transmission line or simulating practical training scenarios where partial discharge is hidden in complex environmental noise. Then, trainees use a partial discharge detection device connected to the high-frequency partial discharge sensor on the coaxial branch grounding lead 122 inside the joint integration box to operate the partial discharge detection, learning partial discharge detection and location methods and techniques. Alternatively, this system can be used to assess participants' mastery of high-voltage cable partial discharge detection and location techniques, thereby popularizing and improving the high-voltage cable partial discharge detection technology level of testing personnel. Figure 7In the application scenario of the structure, the training instructor uses the composite signal simulation generator 602 to directly or indirectly inject simulated signals into any high-voltage transmission line joint simulation integration box, simulating partial discharge in the high-voltage transmission line or simulating training scenarios where partial discharge is hidden in complex environmental noise. Then, the trainees use the partial discharge detection device and partial discharge sensor to perform partial discharge detection on the intermediate joint grounding box and on the coaxial branch grounding lead 122. Through this process, they learn the detection sensitivity of different testing methods for transmission line intermediate joints, enabling them to flexibly select the most suitable detection method to cope with actual on-site operating conditions and environmental conditions, thereby improving detection efficiency, timely detection of potential problems in transmission line intermediate joints, and ensuring the safe and stable transmission of power.

[0077] See Figure 8 , Figure 8 This is a schematic diagram of the high-voltage transmission line joint simulation integrated box in another embodiment. It should be noted that... Figure 2 The coaxial signal shield 121 in the middle specifically includes: Figure 8 Coaxial RF signal shielded cable 1212, coaxial RF signal shielded cable 1215, coaxial RF signal shielded cable 1218, connection point 1211 between the left end of the three-phase cable connector and the high-voltage transmission line, connection point 1214 between the left end of the three-phase cable connector and the high-voltage transmission line, connection point 1217 between the left end of the three-phase cable connector and the high-voltage transmission line, connection point 1213 between the right end of the three-phase cable connector and the high-voltage transmission line, connection point 1216 between the right end of the three-phase cable connector and the high-voltage transmission line, and connection point 1219 between the right end of the three-phase cable connector and the high-voltage transmission line; Figure 2 The coaxial branch grounding lead 122 specifically includes Figure 8 The coaxial branch grounding lead 1221, coaxial branch grounding lead 1222, and coaxial branch grounding lead 1223 of the cable joint. Figure 2 The signal detection transmission line 131 in the middle specifically includes Figure 8 The high-frequency partial discharge sensor and detection signal transmission line 1311, high-frequency partial discharge sensor and detection signal transmission line 1312 and high-frequency partial discharge sensor and detection signal transmission line 1313 are described in the text. Figure 2 The signal is directly injected into lead 141, specifically including Figure 8 The analog partial discharge signal direct injection points 1411, 1412, 1413, 1414, 1415, and 1416 are shown in the figure. Figure 2 The signal indirect injection lead 142 in the middle specifically includes Figure 8The analog partial discharge signal indirect injection points 1421, 1422, and 1423 are shown in the figure. Figure 2 The aluminum foil electrode 123 specifically includes Figure 8 The aluminum foil electrodes 1231, 1232, and 1233 are included. In one embodiment, the intermediate connector module, high-frequency partial discharge detection module, and signal injection module inside the high-voltage transmission line connector simulation integrated box are configured as follows: Figure 8As shown, it mainly consists of three 10cm SYV coaxial radio frequency signal shielded wires 1212, 1215 and 1218, coaxial branch grounding leads 1221, 1222 and 1223 of the three-phase cable connector, high-frequency partial discharge sensor and detection signal transmission lines 1311, 1312 and 1313, connection points 1211, 1214 and 1217 between the left end of the three-phase cable connector and the high-voltage transmission line, connection points 1213, 1216 and 1219 between the right end of the three-phase cable connector and the high-voltage transmission line, direct injection points 1411, 1412, 1413, 1414, 1415 and 1416 of the analog partial discharge signal, indirect injection points 1421, 1422 and 1423 of the analog partial discharge signal, and three pairs of aluminum foil electrodes 1231, 1232 and 1233. The wave velocity of the SYV coaxial RF signal shielded cable (200 m / μs) differs from that of the high-voltage cross-linked polyethylene cable (170 m / μs), but the waveform characteristics of the partial discharge signal after transmission are the same, with no change in waveform characteristics after transmission; the PRPD spectrum characteristics of the partial discharge signal also remain unchanged after transmission. Using the coaxial RF signal shielded cable to simulate power cable observation of partial discharge is effective. The intermediate connector module separates the braided copper wire shielding in the middle of three 10cm coaxial RF signal shielded cables. The braided copper wire shielding of coaxial RF signal shielded cables 1212, 1215, and 1218 for phases A, B, and C are respectively connected to coaxial branch grounding leads 1221, 1222, and 1223 for phases A, B, and C. These coaxial branch grounding leads are used to connect to the grounding box for grounding. The intermediate connector module separates the braided copper wire shielding sleeves at the left and right ends of three 10cm coaxial RF signal shielded cables. The left-end core conductors and braided copper wire shielding of coaxial RF signal shielded cables 1212, 1215, and 1218 are respectively connected to the three 1-meter-long coaxial RF signal shielded cables. At the end of the cable, BNC coaxial connectors are installed at the left end of the three-phase cable connectors, connecting to the high-voltage transmission line at points 1211, 1214, and 1217, to achieve quick connection and disconnection with the high-voltage transmission line. Similarly, the right-end core conductors and braided copper wire shielding of coaxial RF signal shielded cables 1212, 1215, and 1218 are respectively connected to the three 1-meter-long coaxial RF signal shielded cables. At the end of the cable, BNC coaxial connectors are installed at the right end of the three-phase cable connectors, connecting to the high-voltage transmission line at points 1213, 1216, and 1219, to achieve quick connection and disconnection with the high-voltage transmission line. The high-frequency partial discharge (PD) detection module mounts a high-frequency PD sensor on a coaxial branch grounding lead and extends detection signal transmission lines 1311, 1312, and 1313. Connecting to a PD detection device, oscilloscope, or spectrum analyzer allows for PD detection. The high-frequency PD sensor is extremely miniaturized, with dimensions of 12mm outer diameter, 8mm inner diameter, and 8mm thickness. The sensor boasts a detection frequency exceeding 100MHz, offering a wide detection frequency range and high sensitivity. The signal injection module employs both direct and indirect injection methods.In the direct injection method, the left-end cable core conductors and braided copper wire shields of coaxial RF signal shielded cables 1212, 1215, and 1218 are respectively connected to the BNC coaxial connectors on the front left side of the connector integration box to simulate partial discharge signal direct injection points 1411, 1412, and 1413, which are set as the simulated partial discharge signal direct injection points. Similarly, the right-end cable core conductors and braided copper wire shields of coaxial RF signal shielded cables 1212, 1215, and 1218 are respectively connected to the BNC coaxial connectors on the front right side of the connector integration box to simulate partial discharge signal direct injection points 1414, 1415, and 1416, which are set as the simulated partial discharge signal direct injection points. Using a composite signal simulation generator, the injection points can be quickly connected, allowing the simulated partial discharge signal to be directly injected between the cable core conductors and braided copper wire shields at the left or right end of the cable connector, simulating partial discharge in high-voltage transmission lines. This method is called the direct injection method. In the indirect injection method, two layers of aluminum foil 1231, 1232 and 1233 are wrapped around the surface of the cable body at both ends of the three-phase cable joint. The aluminum foil is fastened with a metal ring and a connecting wire is led out. The wire is connected to the BNC coaxial connector in the middle of the front side of the joint integration box to simulate the indirect injection points 1421, 1422 and 1423 of the partial discharge signal. The composite signal simulation generator is then connected to couple the analog signal into the high-voltage transmission line.

[0078] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0079] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A high voltage power line joint simulation integrated box, characterized in that, The utility model relates to a high frequency partial discharge detection device for high voltage transmission line, which comprises: an insulating shell, an intermediate joint module, a high frequency partial discharge detection module and a signal injection module; wherein the intermediate joint module, the high frequency partial discharge detection module and the signal injection module are arranged in the insulating shell; the intermediate joint module is electrically connected with the high voltage transmission line and the grounding box outside the insulating shell, and is used for simulating the intermediate joint of the high voltage transmission line; the high frequency partial discharge detection module is electrically connected with the partial discharge detection positioning device outside the insulating shell, and is used for detecting the simulation signal; the signal injection module is electrically connected with the composite signal simulation generating device outside the insulating shell, and is used for injecting the simulated high voltage transmission line partial discharge signal.

2. The high voltage power line joint simulation integrated box according to claim 1, characterized in that, the intermediate joint module comprises three coaxial signal shielding wires and three coaxial branch grounding leads; two ends of each coaxial signal shielding wire are electrically connected with two corresponding high voltage transmission lines outside the insulating shell respectively; each coaxial signal shielding wire comprises a first shielding sleeve cutting point, a second shielding sleeve cutting point and a third shielding sleeve cutting point arranged in sequence; one end of each coaxial branch grounding lead is electrically connected with the grounding box outside the insulating shell, and the other end of the corresponding wire core conductor and braided shield is connected with the second shielding sleeve cutting point.

3. The high voltage power line joint simulation integrated box according to claim 2, characterized in that, the intermediate joint module further comprises three pairs of aluminum foil electrodes; one aluminum foil electrode in each pair of aluminum foil electrodes is arranged around the first shielding sleeve cutting point and the second shielding sleeve cutting point of the corresponding coaxial signal shielding wire, and the other aluminum foil electrode is arranged around the second shielding sleeve cutting point and the third shielding sleeve cutting point of the coaxial signal shielding wire.

4. The high voltage power line joint simulation integrated box according to claim 2, characterized in that, the high frequency partial discharge detection module comprises three signal detection transmission lines and three high frequency partial discharge sensors; one end of each signal detection transmission line is connected with one corresponding high frequency partial discharge sensor; the high frequency partial discharge sensor is sleeved in the corresponding coaxial branch grounding lead, close to the wire core conductor at one end of the second shielding sleeve cutting point; the other end of the signal detection transmission line is electrically connected with the partial discharge detection positioning device outside the insulating shell.

5. The high voltage power line joint simulation integrated box according to claim 4, characterized in that, the signal detection transmission line is used for connecting the partial discharge detection device, an oscilloscope and a spectrum analyzer included in the partial discharge detection positioning device outside the insulating shell.

6. The high voltage power line joint simulation integrated box according to claim 2, characterized in that, the signal injection module comprises six signal direct injection leads; the wire core conductors at one end of each two signal direct injection leads are electrically connected with the wire core conductors at the first shielding sleeve cutting point and the third shielding sleeve cutting point of the same coaxial signal shielding wire respectively; the braided shields at one end of each two signal direct injection leads are electrically connected with the braided shields at the first shielding sleeve cutting point and the third shielding sleeve cutting point of the same coaxial signal shielding wire respectively; the other ends of the six signal direct injection leads are electrically connected with the composite signal simulation generating device outside the insulating shell.

7. The high voltage power line joint simulation integrated box according to claim 3, characterized in that, the signal injection module further comprises three signal indirect injection leads; One end of each of the signal indirect injection lead wire corresponds to the braided shield and the core conductor, and is respectively connected to the two aluminum foil electrodes of the corresponding coaxial signal shielded wire; the other end is connected to the composite signal analog generating device outside the insulating shell.

8. The high voltage power line joint simulation integrated box according to claim 1, characterized in that, The intermediate joint module includes a coaxial signal shielded wire and a coaxial branch grounding lead wire; the signal injection module includes a signal direct injection lead wire and a signal indirect injection lead wire; and the high-frequency partial discharge detection module includes a signal detection transmission line. Any one of the coaxial signal shielded wire, the coaxial branch grounding lead wire, the signal direct injection lead wire, the signal indirect injection lead wire and the signal detection transmission line has an end extending out of the insulating shell and provided with a BNC coaxial connector.

9. A simulation system of a high voltage power line joint simulation integrated box, characterized in that, The system includes a partial discharge detection positioning device, a composite signal analog generating device, a grounding box and a high-voltage transmission line joint device; wherein the high-voltage transmission line joint device includes at least one high-voltage transmission line joint simulation integrated box according to any one of claims 1-8. The high-voltage transmission line joint device is respectively connected to the partial discharge detection positioning device, the composite signal analog generating device and the grounding box, and is respectively connected to the GIS cable terminal and the outdoor terminal outside the system.

10. The simulation system of a high voltage power line joint simulation integrated box according to claim 9, characterized in that, The system further includes a first terminal and a second terminal. The first terminal is wirelessly connected to the composite signal analog generating device for controlling the composite signal analog generating device to inject an analog high-voltage transmission line partial discharge signal into the high-voltage transmission line joint device; and the second terminal is wirelessly connected to the partial discharge detection positioning device for acquiring and displaying the detection simulation signal collected by the partial discharge detection positioning device.

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