A test device for DC gas-insulated metal-enclosed transmission lines

Abstract

This invention belongs to the field of high-voltage transmission lines and insulation technology, and in particular to a test device for DC gas-insulated metal-enclosed transmission lines. It includes a base and a first insulation transmission component. A linkage platform and a drive mechanism are fixedly mounted on the top of the end of the base furthest from the first insulation transmission component. During the experiment, only the DC high-voltage source is turned on. The distribution of charge density on the surface of the insulator is recorded by a space charge sensor on the monitoring unit. Finally, simulation calculations are performed through a smart terminal, which can plot the charge density-field strength relationship curve, thus completing DC withstand and space charge distribution tests. Alternatively, during the experiment, both the DC high-voltage source and the impulse generator are turned on simultaneously. The impulse wave is superimposed onto the DC voltage through a coupling circuit. The discharge pulse is captured by a partial discharge detector on the monitoring unit, and the discharge amplitude and phase are recorded. Repeated operations are used to statistically analyze the flashover probability, thus completing the DC superposition operation impulse test.

Description

Technical Field

[0001] This invention belongs to the field of high-voltage transmission lines and insulation technology, specifically relating to a test device for DC gas-insulated metal-enclosed transmission lines. Background Technology

[0002] A DC gas-insulated metal-enclosed transmission line is a device used to transmit DC power. It consists of a metal shell, a central high-voltage DC conductor, and insulating gas filling the space between them. It works based on the principle of gas insulation. In its production, manufacturing, performance research and operation, the test device plays a crucial role.

[0003] Traditional transmission line testing equipment lacks flexibility and adaptability, and its single function makes it difficult to efficiently integrate and complete DC withstand, space charge distribution testing, DC superposition operation impact testing, and multi-insulating gas comparison testing on the same platform. Moreover, it cannot perform optimization tests on insulators, cannot find the parts of the insulator with high field strength or stress, and thus cannot find the parts that urgently need optimization. It cannot provide test basis for the actual design of insulators.

[0004] To address the aforementioned issues, this application proposes a test device for DC gas-insulated metal-enclosed transmission lines. Summary of the Invention

[0005] This invention provides a test device for DC gas-insulated metal-enclosed transmission lines, which can effectively solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a test device for DC gas-insulated metal-enclosed transmission lines, comprising a base and a first insulation transmission component, wherein a linkage platform and a drive mechanism are fixedly provided at the top of the end of the base away from the first insulation transmission component, a linkage-type lifting mechanism is slidably inserted on the drive mechanism, a second insulation transmission component is fixedly provided at the top of the linkage-type lifting mechanism, a test GIL segment is provided between the second insulation transmission component and the first insulation transmission component, and a support frame is provided at the bottom of the test GIL segment;

[0007] The line test device also includes a high voltage generating unit, a monitoring unit and an intelligent terminal, and there is an electrical connection between the high voltage generating unit, the tested GIL segment, the monitoring unit and the intelligent terminal;

[0008] The high-voltage generation unit consists of a DC high-voltage source, an impulse generator, and a coupling circuit. The coupling circuit can superimpose the impulse wave emitted by the impulse generator onto the DC voltage to simulate the impulse high voltage required for the test. The monitoring unit consists of an electric field strength sensor, a space charge sensor, a partial discharge detector, and a gas composition analysis module to monitor various data during the test. The intelligent terminal is used to perform simulation calculations on the various data detected by the monitoring unit and establish a GIL model.

[0009] Preferably, the driving mechanism includes a support plate fixedly mounted on the top of the base, and multiple electric push rods are fixedly mounted on the support plate. One end of each electric push rod is fixedly connected to a frame, and a sliding assembly is provided between the bottom end of the frame and the base.

[0010] Preferably, the linkage lifting mechanism includes a lifting rod that is slidably inserted on the frame, the top end of the lifting rod being fixedly connected to the second insulated transmission component, the bottom end of the lifting rod and the outer side of the bottom end being respectively provided with a lifting plate and a return spring, and the bottom of the lifting plate being provided with a movable roller.

[0011] Preferably, both the first insulating transmission component and the second insulating transmission component include an insulating transmission sleeve and a connecting part. The inner cavity of the insulating transmission sleeve is fixedly provided with a power transmission guide rod, and the top and bottom sides of the power transmission guide rod are respectively provided with a high-voltage terminal and a telescopic connecting mechanism.

[0012] Preferably, the telescopic connection mechanism includes a metal conductive sleeve fixedly connected to one side of the power transmission rod and a rectangular conductive post slidably inserted at one end of the metal conductive sleeve. A connecting sleeve head is fixedly connected to one end of the rectangular conductive post. A first insulating plate and a second insulating plate are respectively fixedly sleeved on the outside of the metal conductive sleeve and the outside of the connecting sleeve head. An insulating spring and a displacement sensor are provided between the first insulating plate and the second insulating plate.

[0013] Preferably, the insulating spring is fixedly connected to the first insulating plate and the second insulating plate at both ends, and the insulating spring is sleeved on the outside of the rectangular conductive post.

[0014] Preferably, a vibration assembly is provided between the top of the support frame and the tested GIL segment for conducting vibration simulation tests.

[0015] Preferably, the tested GIL segment includes a grounded housing that is fixedly connected to one side of the first insulation transmission component by screws. The top of the grounded housing is provided with an insulating gas charging / discharging port and a metal particle injection port. The insulating gas charging / discharging port is provided with a solenoid valve. A simulated conductor is inserted inside the grounded housing. An isolation piston and an insulator are detachably connected to the outside of the simulated conductor through a connecting component.

[0016] Preferably, the connecting assembly includes an external thread disposed on the outside of the simulated conductor and an internal thread disposed on the inside of the isolation piston and the insulator, wherein the isolation piston and the insulator are detachably disposed on the outside of the simulated conductor via the internal and external threads.

[0017] Preferably, the isolation pistons are equidistantly arranged on the outside of the simulated conductor to divide the interior of the grounding shell into multiple independent test chambers, with different types of insulators installed in different test chambers.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The high-voltage generation unit consists of a DC high-voltage source, an impulse generator, and a coupling circuit. The coupling circuit can superimpose the impulse wave emitted by the impulse generator onto the DC voltage to simulate the impulse high voltage required for the test. During the experiment, only the DC high-voltage source is turned on. The distribution of charge density on the surface of the insulator is recorded by the space charge sensor on the monitoring unit. Finally, the simulation calculation is performed through the intelligent terminal, and the charge density-field strength relationship curve can be plotted. The DC withstand and space charge distribution tests can be completed. During the experiment, the DC high-voltage source and the impulse generator are turned on simultaneously. The impulse wave is superimposed onto the DC voltage through the coupling circuit. The discharge pulse is captured by the partial discharge detector on the monitoring unit, and the discharge amplitude and phase are recorded. Repeated operation can statistically analyze the flashover probability and complete the DC superposition operation impulse test.

[0020] 2. By detachably installing insulators and isolation pistons on the outside of the simulated conductor, the tested GIL segment can be divided into multiple independent test chambers through the isolation pistons. Different types of insulating gases can be filled into the independent test chambers through the insulating gas filling and discharging ports to conduct comparative tests. Furthermore, the gas composition analysis module on the monitoring unit can scan and detect the gas components, and the intelligent terminal can perform simulation calculations to generate a gas decomposition kinetics report and monitor the gas decomposition products in real time online.

[0021] 3. The insulator is detachably mounted on the outside of the simulated conductor via a fixing component. Different insulators can be replaced for comparative testing during the test, which can effectively identify areas with high field strength on the insulator and thus find areas that urgently need optimization. Furthermore, conductive particles are introduced into the test chamber through the metal particle injection port during the test. The conductive particles will move under the action of the electric field and adhere to the surface of the insulator, causing the flashover voltage on the surface of the insulator to decrease further. This can simulate the discharge defects of metal particle contaminants and provide a basis for fault diagnosis in actual use.

[0022] 4. By setting up a telescopic connection mechanism, which has a certain deformation capacity, it can effectively clamp and fix simulated conductors of different lengths. It can effectively compensate for the thermal expansion and mechanical deformation of the simulated conductors during the test. Moreover, the displacement sensor set on it can detect the deformation of the simulated conductors during the test, which can provide theoretical support for the actual deployment in the later stage.

[0023] 5. The drive mechanism can control the left and right movement of the second insulation transmission component, facilitating the disassembly and assembly of the test device. When the second insulation transmission component is moved to the right for disassembly, the linkage lifting mechanism, in conjunction with the linkage platform, will lift the second insulation transmission component upwards, causing it to misalign with one end of the tested GIL segment. This prevents the second insulation transmission component from obstructing the removal of the simulated conductor, facilitating the removal of the simulated conductor from the tested GIL segment. This allows for the replacement of the insulator for comparative testing. Furthermore, during the removal of the simulated conductor from the tested GIL segment, the isolation piston can carry out conductive particles from inside the tested GIL segment, enabling rapid removal of conductive particles and facilitating the next test operation. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0025] Figure 1 This is a schematic diagram of the structure of a DC gas-insulated metal-enclosed transmission line test device according to the present invention;

[0026] Figure 2 This is a cross-sectional view of a DC gas-insulated metal-enclosed transmission line test device according to the present invention;

[0027] Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A in the diagram;

[0028] Figure 4 This is a schematic diagram of the connection structure between the drive mechanism, the linkage lifting mechanism and the second insulated transmission component in this invention;

[0029] Figure 5 This is a cross-sectional view of the second insulated transmission component in this invention.

[0030] Figure 6 This is a schematic diagram of the telescopic connection mechanism in this invention;

[0031] Figure 7 This is a schematic cross-sectional view of the GIL segment in the test subject in this invention;

[0032] Figure 8 This is a schematic diagram of the circuit layout of the present invention.

[0033] In the picture:

[0034] 1. Base;

[0035] 2. First insulated transmission assembly;

[0036] 3. Interconnection platform;

[0037] 4. Drive mechanism; 401. Support plate; 402. Multi-section electric actuator; 403. Frame; 404. Sliding assembly;

[0038] 5. Linkage lifting mechanism; 501. Lifting rod; 502. Lifting plate; 503. Return spring; 504. Moving roller;

[0039] 6. Second insulating transmission assembly; 601. Insulating transmission sleeve; 602. Connecting part; 603. Power transmission guide rod; 604. High voltage terminal; 605. Telescopic connecting mechanism; 6051. Metal conductive sleeve; 6052. Rectangular conductive post; 6053. Connecting sleeve head; 6054. First insulating plate; 6055. Second insulating plate; 6056. Insulating spring; 6057. Displacement sensor;

[0040] 7. Tested GIL segment; 701. Grounding casing; 702. Insulating gas charging / discharging port; 703. Metal particle inlet; 704. Solenoid valve; 705. Simulated conductor; 706. Isolation piston; 707. Insulator;

[0041] 8. Support frame. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0043] Examples, such as Figure 1-8 As shown, a DC gas-insulated metal-enclosed transmission line test device includes a base 1 and a first insulation transmission component 2. A linkage platform 3 and a drive mechanism 4 are fixedly provided at the top of the end of the base 1 away from the first insulation transmission component 2. A linkage lifting mechanism 5 is slidably inserted on the drive mechanism 4. A second insulation transmission component 6 is fixedly provided at the top of the linkage lifting mechanism 5. A test GIL segment 7 is provided between the second insulation transmission component 6 and the first insulation transmission component 2. A support frame 8 is provided at the bottom of the test GIL segment 7.

[0044] The line test device also includes a high voltage generating unit, a monitoring unit and an intelligent terminal, and there is an electrical connection between the high voltage generating unit, the tested GIL segment 7, the monitoring unit and the intelligent terminal;

[0045] The high-voltage generation unit consists of a DC high-voltage source, an impulse generator, and a coupling circuit. The coupling circuit can superimpose the impulse wave emitted by the impulse generator onto the DC voltage to simulate the impulse high voltage required for the test. The monitoring unit consists of an electric field strength sensor, a space charge sensor, a partial discharge detector, and a gas composition analysis module to monitor various data during the test. The intelligent terminal is used to perform simulation calculations on the various data detected by the monitoring unit and establish a GIL model.

[0046] In this implementation scheme: the electric field strength sensor uses an embedded electrostatic probe, arranged with an axial spacing of 50cm within the tested GIL segment 7; the space charge sensor uses a capacitive probe array arranged on the surface of insulator 707; the partial discharge detector uses a UHF sensor; and the gas composition analysis module uses a laser spectrometer, which can detect in real time. The decomposition products such as HF are coupled to the DC voltage by the shock wave generated by the shock generator, which is used to simulate the high voltage required for the test. During the experiment, only the DC high voltage source is turned on. The electric field strength sensor and space charge sensor on the monitoring unit record the distribution of electric field and charge density on the surface of insulator 707. Finally, the simulation calculation is performed through the intelligent terminal, and the charge density-field strength relationship curve can be plotted. The DC withstand and space charge distribution tests can be completed. During the experiment, the DC high voltage source and the shock generator are turned on at the same time. The shock wave is superimposed to the DC voltage through the coupling circuit. The discharge pulse is captured by the partial discharge detector on the monitoring unit, and the discharge amplitude and phase are recorded. Repeated operation can be used to count the flashover probability and complete the DC superposition operation shock test.

[0047] Furthermore:

[0048] In an optional embodiment, the drive mechanism 4 includes a support plate 401 fixedly disposed on the top of the base 1, a multi-section electric push rod 402 fixedly disposed on the support plate 401, one end of the multi-section electric push rod 402 being fixedly connected to a frame 403, and a sliding assembly 404 being disposed between the bottom end of the frame 403 and the base 1.

[0049] In this embodiment: by controlling the extension and retraction of the multi-section electric push rod 402, the frame 403 can be driven to move left and right. When the frame 403 moves left and right, it can drive the second insulation transmission component 6 to move left and right. When the second insulation transmission component 6 is moved to the right for disassembly by the drive mechanism 4, the linkage lifting mechanism 5 will be lifted upward under the linkage of the linkage table 3, which can lift the second insulation transmission component 6 upward.

[0050] In an optional embodiment, the linkage lifting mechanism 5 includes a lifting rod 501 that is slidably inserted on the frame 403. The top end of the lifting rod 501 is fixedly connected to the second insulated transmission assembly 6. The bottom end and the outer side of the bottom end of the lifting rod 501 are respectively provided with a lifting plate 502 and a return spring 503. The bottom of the lifting plate 502 is provided with a movable roller 504.

[0051] In this embodiment: when the second insulation transmission component 6 is moved to the right by the drive mechanism 4 for disassembly, the linkage lifting mechanism 5 will be lifted upward under the linkage of the linkage table 3. This can lift the second insulation transmission component 6 upward, causing the second insulation transmission component 6 to be misaligned with one end of the tested GIL segment 7. This can prevent the second insulation transmission component 6 from blocking the pull-out of the simulated conductor 705, making it easier to remove the simulated conductor 705 from the tested GIL segment 7. This facilitates the replacement of the insulator 707 for comparative testing. Moreover, during the process of removing the simulated conductor 705 from the tested GIL segment 7, the isolation piston 706 can bring out the conductive particles inside the tested GIL segment 7 together, which can quickly remove the conductive particles and facilitate the next test operation.

[0052] In an optional embodiment, both the first insulating transmission assembly 2 and the second insulating transmission assembly 6 include an insulating transmission sleeve 601 and a connecting part 602. The inner cavity of the insulating transmission sleeve 601 is fixedly provided with a power transmission guide rod 603. The top and bottom sides of the power transmission guide rod 603 are respectively provided with a high-voltage terminal 604 and a telescopic connecting mechanism 605.

[0053] In this embodiment, the telescopic connecting mechanism 605 has a certain deformation capability, which can effectively clamp and fix the simulated conductors 705 of different lengths, and can effectively compensate for the thermal expansion and mechanical deformation of the simulated conductors 705 during the test.

[0054] In an optional embodiment, the telescopic connection mechanism 605 includes a metal conductive sleeve 6051 fixedly connected to one side of the power transmission rod 603 and a rectangular conductive post 6052 slidably inserted at one end of the metal conductive sleeve 6051. A connecting sleeve head 6053 is fixedly connected to one end of the rectangular conductive post 6052. A first insulating plate 6054 and a second insulating plate 6055 are respectively fixedly sleeved on the outside of the metal conductive sleeve 6051 and the outside of the connecting sleeve head 6053. An insulating spring 6056 and a displacement sensor 6057 are provided between the first insulating plate 6054 and the second insulating plate 6055.

[0055] In this embodiment, the metal conductive sleeve 6051 and the rectangular conductive post 6052 can be extended and retracted to effectively clamp and fix the simulated conductors 705 of different lengths. The deformation of the simulated conductor 705 during the test can be detected by the two sets of displacement sensors 6057 installed on it, which can provide theoretical support for the actual deployment in the later stage. The sum of the values ​​detected by the two sets of displacement sensors 6057 during the test is the deformation of the simulated conductor 705.

[0056] In an optional embodiment, the insulating spring 6056 is fixedly connected to the first insulating plate 6054 and the second insulating plate 6055 at both ends, and the insulating spring 6056 is sleeved on the outside of the rectangular conductive post 6052.

[0057] In this embodiment, the insulating spring 6056 can provide elastic support, facilitating expansion and contraction.

[0058] Furthermore:

[0059] In an optional embodiment, a vibration assembly is provided between the top of the support frame 8 and the tested GIL segment 7 for conducting vibration simulation tests.

[0060] In this embodiment, the vibration component can drive the GIL segment 7 of the test subject to vibrate, and a vibration simulation test can be performed.

[0061] In an optional embodiment, the tested GIL segment 7 includes a grounded housing 701 fixedly connected to one side of the first insulation transmission assembly 2 by screws. The top of the grounded housing 701 is provided with an insulating gas charging / discharging port 702 and a metal particle injection port 703. The insulating gas charging / discharging port 702 is provided with a solenoid valve 704. A simulated conductor 705 is inserted inside the grounded housing 701. An isolation piston 706 and an insulator 707 are detachably connected to the outside of the simulated conductor 705 through a connecting assembly.

[0062] In this embodiment: by detachably setting an insulator 707 and an isolation piston 706 on the outside of the simulated conductor 705, the test GIL segment 7 can be divided into multiple independent test chambers by the isolation piston 706. Different types of insulating gases can be filled into the independent test chambers through the insulating gas filling and discharging port 702 to conduct comparative tests. Furthermore, the gas composition analysis module on the monitoring unit scans and detects the gas components, and the intelligent terminal performs simulation calculations to generate a gas decomposition kinetics report, enabling real-time online monitoring of gas decomposition products.

[0063] In an optional embodiment, the connecting assembly includes an external thread disposed on the outside of the simulated conductor 705 and an internal thread disposed on the inside of the isolation piston 706 and the insulator 707, the isolation piston 706 and the insulator 707 being detachably disposed on the outside of the simulated conductor 705 via the internal and external threads.

[0064] In this embodiment, the insulator 707 is detachably mounted on the outside of the simulated conductor 705 via a fixing component. During the test, different insulators 707 can be replaced for comparative testing, which can effectively find the parts of the insulator 707 with higher electric field strength, thereby finding the parts that urgently need optimization.

[0065] In an optional embodiment, the isolation pistons 706 are equidistantly disposed outside the simulated conductor 705 to divide the interior of the grounding housing 701 into multiple independent test chambers, with different types of insulators 707 installed in different test chambers.

[0066] In this embodiment: During the test, conductive particles are introduced into the test chamber through the metal particle inlet 703. The conductive particles will move under the action of the electric field and attach to the surface of the insulator 707, causing the flashover voltage on the surface of the insulator 707 to decrease further. This can simulate the discharge defect of metal particle contaminants and provide a basis for fault diagnosis in actual use.

[0067] In practice:

[0068] Experiment 1: First, the test GIL segment 7 is evacuated to ≤0.1 Pa and filled with 0.5 MPa of insulating gas. Then, the DC high voltage source is turned on and the voltage is increased to the rated voltage at a certain rate and stabilized for 30 min. The density distribution of the charge on the surface of the insulator is recorded by the space charge sensor. Then, the voltage is gradually increased by 10 kV and stabilized for 5 min at each step until flashover occurs or 800 kV is reached. The charge density-field strength relationship curve is plotted by the intelligent terminal to complete the DC withstand and space charge distribution test.

[0069] Experiment 2: After stable operation under DC preload for 1 hour, the trigger operation impulse generator outputs a standard operation wave. The impulse wave is superimposed on the DC voltage through the coupling circuit. The partial discharge detector captures the discharge pulse, records the discharge amplitude and phase, repeats the impulse 10 times, and calculates the flashover probability to complete the DC superimposed operation impulse test.

[0070] Experiment 3: Injecting a certain mixture of environmentally friendly gas into the GIL segment 7 cavity of the test subject. Then, apply a DC voltage to 80% of the design value for 48 hours. Scan the gas components every 5 minutes using the gas composition analysis module. Process the scanned gas components through the smart terminal to generate a gas decomposition kinetics report. This completes the online monitoring test of gas decomposition products.

[0071] The test GIL segment 7 can be divided into multiple independent test chambers by the isolation piston 706. Different types of insulating gases can be filled into the independent test chambers through the insulating gas filling and discharging port 702 to conduct comparative tests. The gas composition analysis module on the monitoring unit can scan and detect the gas components, and the intelligent terminal can perform simulation calculations to generate a gas decomposition kinetics report, so that the gas decomposition products can be monitored online in real time.

[0072] By comparing different insulators 707 during the test, the area with high electric field strength of insulator 707 can be effectively identified, thus finding the area that urgently needs optimization. In addition, conductive particles are introduced into the test chamber through the metal particle injection port 703. The conductive particles will move under the action of the electric field and attach to the surface of insulator 707, causing the flashover voltage on the surface of insulator 707 to decrease further. This can simulate the discharge defect of metal particle contaminants and provide a basis for fault diagnosis in actual use.

[0073] The telescopic connecting mechanism 605 has a certain deformation capacity, which can effectively clamp and fix the simulated conductors 705 of different lengths. It can effectively compensate for the thermal expansion and mechanical deformation of the simulated conductors 705 during the test. Moreover, through the two sets of displacement sensors 6057 set on it, the deformation of the simulated conductors 705 during the test can be detected, which can provide theoretical support for the actual deployment in the later stage. The sum of the values ​​detected by the two sets of displacement sensors 6057 during the test is the deformation of the simulated conductors 705.

[0074] When the second insulation transmission assembly 6 is moved to the right by the drive mechanism 4 for disassembly, the linkage lifting mechanism 5 will be lifted upward under the linkage of the linkage table 3. This can lift the second insulation transmission assembly 6 upward, causing it to be misaligned with one end of the tested GIL segment 7. This prevents the second insulation transmission assembly 6 from blocking the pull-out of the simulated conductor 705, making it easier to remove the simulated conductor 705 from the tested GIL segment 7. This facilitates the replacement of the insulator 707 for comparative testing. Furthermore, during the process of removing the simulated conductor 705 from the tested GIL segment 7, the isolation piston 706 can carry out the conductive particles inside the tested GIL segment 7, allowing for rapid removal of the conductive particles.

[0075] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A test device for a DC gas-insulated metal-enclosed transmission line, comprising a base (1) and a first insulation transmission assembly (2), characterized in that: The base (1) is fixedly provided with a linkage platform (3) and a drive mechanism (4) at the top of the end away from the first insulation transmission component (2). A linkage lifting mechanism (5) is slidably inserted on the drive mechanism (4). A second insulation transmission component (6) is fixedly provided at the top of the linkage lifting mechanism (5). A test GIL segment (7) is provided between the second insulation transmission component (6) and the first insulation transmission component (2). A support frame (8) is provided at the bottom of the test GIL segment (7). The line test device also includes a high voltage generating unit, a monitoring unit and an intelligent terminal, and the high voltage generating unit, the tested GIL segment (7), the monitoring unit and the intelligent terminal are electrically connected; The high-voltage generation unit consists of a DC high-voltage source, an impulse generator, and a coupling circuit. The coupling circuit can superimpose the impulse wave emitted by the impulse generator onto the DC voltage to simulate the impulse high voltage required for the test. The monitoring unit consists of an electric field strength sensor, a space charge sensor, a partial discharge detector, and a gas composition analysis module to monitor various data during the test. The intelligent terminal is used to perform simulation calculations on the various data detected by the monitoring unit and establish a GIL model. The drive mechanism (4) includes a support plate (401) fixedly installed on the top of the base (1), and a multi-section electric push rod (402) is fixedly installed on the support plate (401). One end of the multi-section electric push rod (402) is fixedly connected to a frame (403), and a sliding component (404) is provided between the bottom end of the frame (403) and the base (1). The linkage lifting mechanism (5) includes a lifting rod (501) that is slidably inserted on the frame (403). The top end of the lifting rod (501) is fixedly connected to the second insulating transmission assembly (6). The bottom end of the lifting rod (501) and the outer side of the bottom end are respectively provided with a lifting plate (502) and a return spring (503). The bottom of the lifting plate (502) is provided with a moving roller (504). The tested GIL segment (7) includes a grounded housing (701) fixedly connected to one side of the first insulation transmission assembly (2) by screws. The top of the grounded housing (701) is provided with an insulating gas charging port (702) and a metal particle injection port (703). The insulating gas charging port (702) is provided with a solenoid valve (704). A simulated conductor (705) is inserted inside the grounded housing (701). An isolation piston (706) and an insulator (707) are detachably connected to the outside of the simulated conductor (705) through a connecting assembly. The connecting assembly includes an external thread disposed on the outside of the simulated conductor (705) and an internal thread disposed on the inside of the isolation piston (706) and the insulator (707). The isolation piston (706) and the insulator (707) are detachably disposed on the outside of the simulated conductor (705) through the internal thread and the external thread. The isolation pistons (706) are equidistantly arranged on the outside of the simulated conductor (705) to divide the interior of the grounding shell (701) into multiple independent test chambers, and different types of insulators (707) are installed in different test chambers.

2. The test device for DC gas-insulated metal-enclosed transmission lines according to claim 1, characterized in that: Both the first insulating transmission assembly (2) and the second insulating transmission assembly (6) include an insulating transmission sleeve (601) and a connecting part (602). The inner cavity of the insulating transmission sleeve (601) is fixedly provided with a power transmission guide rod (603). The top and bottom sides of the power transmission guide rod (603) are respectively provided with a high-voltage terminal (604) and a telescopic connecting mechanism (605).

3. The test device for DC gas-insulated metal-enclosed transmission lines according to claim 2, characterized in that: The telescopic connection mechanism (605) includes a metal conductive sleeve (6051) fixedly connected to one side of the power transmission guide rod (603) and a rectangular conductive post (6052) slidably inserted at one end of the metal conductive sleeve (6051). A connecting sleeve (6053) is fixedly connected to one end of the rectangular conductive post (6052). A first insulating plate (6054) and a second insulating plate (6055) are fixedly sleeved on the outside of the metal conductive sleeve (6051) and the outside of the connecting sleeve (6053), respectively. An insulating spring (6056) and a displacement sensor (6057) are provided between the first insulating plate (6054) and the second insulating plate (6055).

4. The test device for DC gas-insulated metal-enclosed transmission lines according to claim 3, characterized in that: The insulating spring (6056) is fixedly connected to the first insulating plate (6054) and the second insulating plate (6055) at both ends, and the insulating spring (6056) is sleeved on the outside of the rectangular conductive post (6052).

5. The test device for DC gas-insulated metal-enclosed transmission lines according to claim 4, characterized in that: A vibration assembly is provided between the top of the support frame (8) and the tested GIL segment (7) for conducting vibration simulation tests.

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