A GIS fault test device and test method

Abstract

This invention proposes a GIS fault testing device and method, relating to the field of GIS testing technology. The device comprises a housing, a discharge model, a coupling capacitor, a transformer, and two high-voltage switch assemblies. The housing includes an external connection terminal for connecting to external GIS equipment; the discharge model is disposed within the housing and includes an analog terminal; the coupling capacitor is disposed within the housing and includes an acquisition terminal electrically connected to the analog terminal and the external connection terminal of the discharge model, and is used to collect partial discharge signals; and the transformer is disposed within the housing and electrically connected to the analog terminal of the discharge model. Through static and dynamic testing, the present invention compares data from both tests, enabling a more accurate diagnosis of GIS equipment faults, thereby improving the accuracy of the diagnosis.

Description

Technical Field

[0001] The present invention relates to the technical field of GIS testing, and in particular to a GIS fault testing device and a testing method. Background Art

[0002] Gas-insulated switchgear, or GIS, has been in widespread operation worldwide since its introduction in the 1960s. GIS is widely used not only in high-voltage and extra-high-voltage (EHV) applications, but also in ultra-high-voltage (UHV) applications. Compared to conventional open-type substations, GIS offers advantages such as compact structure, small footprint, high reliability, flexible configuration, easy installation, enhanced safety, and robust environmental adaptability. However, due to its enclosed nature, GIS has limited testing capabilities and long maintenance cycles. Traditional preventive or routine testing can be difficult to detect internal defects, and insulation failures can occur during these testing cycles, resulting in significant losses and significant impact. In recent years, live-testing technology for power equipment has rapidly advanced. For high-voltage switchgear, various defects can develop over time due to factors such as equipment quality defects and aging after long-term operation. These defects can cause partial discharge (PD). Live-testing technology can proactively detect these PD signals, potentially leading to insulation failures, thus facilitating the early detection of latent GIS defects.

[0003] Existing GIS defect simulation and verification equipment usually sets up a high-voltage transformer and cooperates with a simulation unit for simulating discharge defects to conduct static GIS fault tests. That is, static tests are conducted in a fixed test chamber. The test data is only a simulation phenomenon, and it is difficult to accurately judge the fault phenomenon during the real-time operation of the GIS based on the test data. Summary of the Invention

[0004] In view of this, the present invention proposes a GIS fault test device and test method. When conducting a GIS static fault test, the high-voltage switch assembly between the transformer and the discharge model is closed, and the high-voltage switch assembly between the external connection end and the coupling capacitor is disconnected. Voltage is provided through the transformer, and partial discharge signals are collected by the coupling capacitor. The discharge defect is simulated by the discharge model. When conducting a GIS dynamic fault test, the high-voltage switch assembly between the transformer and the discharge model is disconnected, and the high-voltage switch assembly between the external connection end and the coupling capacitor is closed. The external connection end is connected to the GIS equipment, and voltage is provided through the GIS equipment. The coupling capacitor is used to collect partial discharge signals. Through static and dynamic tests, the data of the two can be compared to more accurately judge the fault phenomenon of the GIS equipment, thereby improving the accuracy of the judgment.

[0005] The technical solution of the present invention is achieved as follows:

[0006] On the one hand, the present invention provides a GIS fault test device, including a housing, a discharge model, a coupling capacitor, a transformer and two high-voltage switch assemblies, wherein:

[0007] The housing includes an external connection terminal, and the external connection terminal is used to connect to an external GIS device;

[0008] The discharge model is arranged in the housing, and the discharge model includes a simulation terminal;

[0009] A coupling capacitor is disposed in the housing, the coupling capacitor including a collection end electrically connected to the simulation end and the external connection end of the discharge model, and the coupling capacitor is used to collect partial discharge signals;

[0010] The transformer is arranged in the housing, and the transformer is electrically connected to the simulation end of the discharge model;

[0011] One of the two high-voltage switch assemblies is arranged between the transformer and the discharge model, and is used for on-off control of the transformer and the discharge model. The other high-voltage switch assembly is arranged between the external connection end and the collection end of the coupling capacitor, and is used for on-off control of the coupling capacitor and the external connection end. At least one of the two high-voltage switch assemblies is disconnected.

[0012] Based on the above technical solution, preferably, the housing includes a first control cavity and a second control cavity, the simulation end of the discharge model and the collection end of the coupling capacitor both extend into the first control cavity, and the high-voltage switch assembly connecting the transformer and the discharge model is arranged in the first control cavity, the external connection end is arranged in the second control cavity, and the high-voltage switch assembly connecting the coupling capacitor and the external connection end is arranged in the second control cavity.

[0013] Further preferably, the shell also includes a connecting shell and at least four branch shells, the first control cavity is arranged on the connecting shell, each of the branch shells is fixed on the connecting shell, and the discharge model, coupling capacitor, transformer and second control cavity are respectively arranged in the four branch shells.

[0014] More preferably, the housing further comprises a plurality of sealing isolators, which are respectively arranged at the connection between the connecting shell and the plurality of branch shells to separate the connecting shell from the branch shells.

[0015] Based on the above technical solution, preferably, the high-voltage switch assembly includes a connecting end, which is arranged between the transformer and the discharge model, and its connecting end is electrically connected to the simulation end of the discharge model, the collection end of the coupling capacitor and the connecting end of another high-voltage switch assembly.

[0016] Further preferably, the high-voltage switch assembly further includes a conductive arm, a conductive rod and a driving mechanism, wherein:

[0017] The conductive arm is fixed in the housing and electrically connected to the external connection terminal or the transformer;

[0018] The conductive rod is movably arranged on the conductive arm and electrically connected to the conductive arm. When the conductive rod moves on the conductive arm, it can contact or leave the connection end;

[0019] The driving mechanism is fixed on the shell and is transmission-connected with the conductive rod to drive the conductive rod to contact and leave.

[0020] More preferably, the driving mechanism includes a connecting tube, a screw rod and a motor, wherein:

[0021] The connecting cylinder is arranged in the housing and is fixed to the end of the conductive rod;

[0022] The screw rod extends into the interior of the connecting cylinder and is threadedly connected to the connecting cylinder;

[0023] The motor is fixed on the housing, and the output end is connected to the screw rod for transmission, so that the connecting cylinder is pushed by the thread to drive the conductive rod to move linearly.

[0024] More preferably, the high-voltage switch assembly further includes an isolation mechanism, which is arranged between the conductive rod and the driving mechanism, and is used to electrically isolate the conductive rod from the driving mechanism, and to extinguish the arc after the conductive rod leaves the connection end.

[0025] More preferably, the isolation mechanism includes a first disk, an insulator, a second disk, a connecting rod and a movable arm, wherein:

[0026] The first disc, the insulator, and the second disc are fixed in sequence, and the first disc is fixed on the end of the conductive rod away from the connection end;

[0027] The connecting rod is fixed to the housing and grounded;

[0028] The movable arm is hinged on the connecting rod, and one end is in contact with the second disk. The driving mechanism drives the conductive rod to move through the first disk, the insulator and the second disk. During the movement of the second disk, the movable arm is driven to rotate on the connecting rod.

[0029] When the conductive rod contacts the connection end, the movable arm is not electrically connected to the conductive rod;

[0030] When the conductive rod leaves the connection end, the movable arm is electrically connected to the conductive rod.

[0031] In another aspect, the present invention provides a GIS fault test method, which is implemented based on the above-mentioned GIS fault test device. The GIS fault test method includes:

[0032] When conducting a GIS static fault test, close the high-voltage switch assembly between the transformer and the discharge model, and disconnect the high-voltage switch assembly between the external connection terminal and the coupling capacitor. Voltage is supplied through the transformer, partial discharge signals are collected on the coupling capacitor, and the discharge model simulates discharge defects.

[0033] When conducting a GIS dynamic fault test, disconnect the high-voltage switch assembly between the transformer and the discharge model, close the high-voltage switch assembly between the external connection end and the coupling capacitor, and connect the external connection end to the GIS equipment. The voltage is provided through the GIS equipment, and the coupling capacitor is used to collect partial discharge signals.

[0034] The GIS fault test device and test method of the present invention have the following beneficial effects compared with the prior art:

[0035] (1) By setting an external connection terminal, a transformer, a coupling capacitor and a discharge model, when conducting a GIS static fault test, the high-voltage switch assembly between the transformer and the discharge model is closed, and the high-voltage switch assembly between the external connection terminal and the coupling capacitor is disconnected, voltage is provided through the transformer, and partial discharge signals are collected by the coupling capacitor, and discharge defects are simulated by the discharge model. When conducting a GIS dynamic fault test, the high-voltage switch assembly between the transformer and the discharge model is disconnected, and the high-voltage switch assembly between the external connection terminal and the coupling capacitor is closed, and the external connection terminal is connected to the GIS equipment, voltage is provided through the GIS equipment, and partial discharge signals are collected by the coupling capacitor. Through static and dynamic tests, the fault phenomenon of the GIS equipment can be more accurately judged by comparing the data of the two, thereby improving the accuracy of the judgment;

[0036] (2) By setting up a driving mechanism, and correspondingly setting up a connecting tube, a screw and a motor, the connecting tube is fixed to the end of the conductive rod, the screw extends into the interior of the connecting tube and is threadedly connected to the connecting tube, the motor is fixed to the housing, and the output end is connected to the screw, so that the connecting tube is pushed by the thread to drive the conductive rod to perform linear motion, and the motor performs the electronically controlled opening and closing of the high-voltage switch assembly, which can realize the rapid switching of the static and dynamic fault tests of the equipment, avoid the possibility of manual switching misoperation, and at the same time improve the safety of the test process;

[0037] (3) By setting the isolation mechanism between the conductive rod and the driving mechanism, the conductive rod and the driving mechanism are electrically isolated, and the arc is extinguished after the conductive rod leaves the connection end. The setting of the isolation mechanism can improve the stability of the equipment during operation, protect the internal components, and prevent tip discharge. The isolation mechanism is specifically set between the connecting tube and the conductive rod. The isolation mechanism isolates the conductive rod from the motor, which can avoid high voltage damage to the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 It is a structural schematic diagram of the GIS fault test device of the present invention;

[0040] Figure 2 A perspective view of a high-voltage switch assembly of a GIS fault test device according to the present invention;

[0041] Figure 3 It is a side view of the high-voltage switch assembly of the GIS fault testing device of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] like Figure 1-3 As shown, the GIS fault test device of the present invention includes a housing 1, a discharge model 2, a coupling capacitor 3, a transformer 4 and two high-voltage switch assemblies 5.

[0044] The housing 1 includes an external connection terminal 11, which is used to connect to external GIS equipment. Since there are high-voltage devices in the housing 1, the internal environment of the housing 1 needs to have good insulation properties. To ensure its good insulation performance, the interior of the housing 1 can be filled with an inert gas at a certain pressure. SF6 gas can be used as the inert gas.

[0045] The discharge model 2 is arranged in the shell 1. The discharge model 2 includes a simulation end. The discharge model 2 is used to simulate GIS local discharge defects. The types of simulation include but are not limited to the tip, suspension, air gap, particle, surface and other discharge types of GIS equipment. In fact, the discharge model 2 can be used as a simulation device that can switch between different discharge types, thereby realizing static simulation and switching of multiple discharge defects.

[0046] The coupling capacitor 3 is arranged in the housing 1. The coupling capacitor 3 includes a collection end, which is electrically connected to the simulation end and the external connection end 11 of the discharge model 2. The coupling capacitor 3 is used to collect partial discharge signals. In a certain embodiment, the coupling capacitor can be selected to have a rated voltage of 150kV and a rated capacitance of 150pf.

[0047] The transformer 4 is disposed in the housing 1 and is electrically connected to the simulation end of the discharge model 2. The transformer 4 is used to provide high voltage when performing a discharge defect simulation to cooperate with the discharge model 2 and the coupling capacitor 3 to perform a static fault simulation test. In one embodiment, the specific parameters of the transformer 4 are selected as an input voltage of 380V, an output voltage of 150kV, and a rated capacity of 15kVA.

[0048] One of the two high-voltage switch assemblies 5 is arranged between the transformer 4 and the discharge model 2, and is used for on-off control of the transformer 4 and the discharge model 2. The other high-voltage switch assembly 5 is arranged between the external connection terminal 11 and the collection terminal of the coupling capacitor 3, and is used for on-off control of the coupling capacitor 3 and the external connection terminal 11. At least one of the two high-voltage switch assemblies 5 is disconnected.

[0049] This embodiment provides an external connection terminal 11, a transformer 4, a coupling capacitor 3, and a discharge model 2. During a GIS static fault test, the high-voltage switch assembly 5 between the transformer 4 and the discharge model 2 is closed, and the high-voltage switch assembly 5 between the external connection terminal 11 and the coupling capacitor 3 is disconnected. Voltage is provided through the transformer 4, and partial discharge signals are collected by the coupling capacitor 3. Discharge defects are simulated by the discharge model 2. During a GIS dynamic fault test, the on-off states of the two high-voltage switch assemblies 5 are opposite. Voltage is then provided through the coupling capacitor 3 connected to the GIS device, and dynamic partial discharge signals are collected by the coupling capacitor 3. Static and dynamic tests allow for a more accurate determination of GIS device faults by comparing the data from both tests, thereby improving the accuracy of the determination.

[0050] In some embodiments, a first control chamber 101 and a second control chamber 102 are provided on the housing 1. The first control chamber 101 and the second control chamber 102 are separated and the internal gases are completely isolated. The simulation end of the discharge model 2 and the collection end of the coupling capacitor 3 both extend into the first control chamber 101, and the high-voltage switch assembly 5 connecting the transformer 4 and the discharge model 2 is arranged in the first control chamber 101, the external connection end 11 is arranged in the second control chamber 102, and the high-voltage switch assembly 5 connecting the coupling capacitor 3 and the external connection end 11 is arranged in the second control chamber 102. The two high-voltage switch assemblies 5 operate in the first control chamber 101 and the second control chamber 102 respectively, so that there is no mutual interference during the opening and closing process. At the same time, when the two high-voltage switch assemblies 5 are repaired through the first control chamber 101 and the second control chamber 102 respectively, it is only necessary to replace the gas in one of the chambers of the first control chamber 101 and the second control chamber 102, thereby reducing the maintenance cost.

[0051] In a specific embodiment, the housing 1 also includes a connecting shell 12 and at least four branch shells 13. The first control cavity 101 is arranged on the connecting shell 12, and each of the branch shells 13 is fixed on the connecting shell 12. The discharge model 2, coupling capacitor 3, transformer 4 and second control cavity 102 are respectively arranged in the four branch shells 13.

[0052] The connecting shell 12 and the branch shell 13 can be made of stainless steel. In order to facilitate the explanation of this embodiment, four branch shells 13 are set as an example. Four openings are provided on the connecting shell 12, each opening is connected to a branch shell 13, and a ninety-degree angle is formed between two adjacent branch shells 13. The discharge model 2, the coupling capacitor 3, and the transformer 4 are each installed in a branch shell 13, and electrical isolation is performed at the same time. The remaining branch shell 13 is installed with a high-voltage switch assembly 5 connected to the external connection terminal 11 and the coupling capacitor 3. In the middle connecting shell 12, another high-voltage switch assembly 5 is arranged inside it. At the same time, the connecting shell 12 is also the connection center of each device. A standard square wave injection port is also provided on the connecting shell 12 to connect to the internal electrical components of the connecting shell 12.

[0053] In some embodiments, the outside of the connecting shell 12 is connected to each branch shell 13 through a flange structure. In order to ensure the electrical isolation of each branch shell 13 from the connecting shell 12, a plurality of sealing isolation members 14 are also provided on the outer shell 1. The plurality of sealing isolation members 14 are respectively provided at the connection between the connecting shell 12 and the plurality of branch shells 13 to separate the connecting shell 12 from the branch shell 13, thereby separating the interior of each branch shell 13 and the interior of the connecting shell 12 into insulating air cavities and filling them with inert gas to ensure the insulation conditions during the operation of the device. Specifically, the sealing isolation member 14 is made of rubber and is arranged in an umbrella shape, so that it has a certain elasticity to facilitate the installation of electrical connectors.

[0054] In order to connect each device to the connecting shell 12 through the sealing isolator 14, a copper connecting rod can be used. By passing the connecting rod through the center of the sealing isolator 14, the electrical connection of two different insulating air cavities can be achieved. In addition, in order to protect the high-voltage control components, a voltage-equalizing ball can be set at the end of the connecting rod to prevent corona arc extinguishing and thus equalize the electric field.

[0055] In some embodiments, the high-voltage switch assembly 5 includes a connecting terminal 51, which is arranged between the transformer 4 and the discharge model 2. The connecting terminal 51 is electrically connected to the analog end of the discharge model 2, the collection end of the coupling capacitor 3, and the connecting terminal 51 of another high-voltage switch assembly 5. Since the connecting terminal 51 needs to perform on-off control of high-voltage electricity, it needs to have a certain arc extinguishing ability. Therefore, the connecting terminal 51 is preferably a voltage-equalizing structure. Considering that it needs to turn on and off the circuit, it is preferably a solid voltage-equalizing ball. A groove is set in the center of the voltage-equalizing ball to increase the contact area when closed and reduce the resistance.

[0056] In some embodiments, the high-voltage switch assembly 5 also includes a conductive arm 52, a conductive rod 53 and a driving mechanism 54. The conductive arm 52 is fixed in the housing 1 and is electrically connected to the external connection terminal 11 or the transformer 4. The conductive rod 53 is movably arranged on the conductive arm 52 and is electrically connected to the conductive arm 52. When the conductive rod 53 moves on the conductive arm 52, it can contact or leave the connection terminal 51. The driving mechanism 54 is fixed on the housing 1 and is transmission-connected to the conductive rod 53 to drive the conductive rod 53 to contact and leave.

[0057] In order to set up the driving mechanism 54, a fixing plate can be installed on the housing 1. By setting the driving mechanism 54 on the fixing plate, it has better stability. When the high-voltage switch assembly 5 is closed, the fixing plate needs to be disconnected from the conductive arm 52 and the conductive rod 53, thereby protecting the driving mechanism 54.

[0058] The conductive arm 52 is perpendicular to the conductive rod 53 as a whole, and a guide sleeve is provided on the conductive arm 52. The guide sleeve is sleeved on the outside of the conductive rod 53 and contacts the conductive rod 53. In order to prevent the conductive rod 53 from rotating as a whole relative to the guide sleeve on the conductive arm 52, a straight groove can be opened on the conductive rod 53, and a limit piece can be added in the guide sleeve so that the limit piece is inserted into the straight groove. Alternatively, the conductive rod 53 can be set to a polygon and the guide sleeve head can be adapted to it, so that the conductive rod 53 can be movable and stably electrically connected to the conductive arm 52. Under this setting, the linear drive of the conductive rod 53 by the driving mechanism 54 can make the conductive rod 53 contact or leave the corresponding connection terminal 51, thereby realizing the opening and closing control of the high-voltage switch assembly 5 and completing the electrical on-off operation. In addition, the end of the conductive rod 53 can also be set to a voltage-equalizing structure to avoid tip discharge.

[0059] Specifically, the conductive arm 52 of the high-voltage switch assembly 5 arranged in the first control cavity 101 is electrically connected to the transformer 4, and the conductive arm 52 of the high-voltage switch assembly 5 arranged in the second control cavity 102 is electrically connected to the external connection terminal 11.

[0060] In some embodiments, the driving mechanism 54 includes a connecting tube 541, a screw rod 542 and a motor 543. The connecting tube 541 is arranged in the outer shell 1 and is fixed to the end of the conductive rod 53. The screw rod 542 extends to the interior of the connecting tube 541 and is threadedly connected to the connecting tube 541. The motor 543 is fixed on the outer shell 1, and the output end is transmission-connected to the screw rod 542 to push the connecting tube 541 through the thread to drive the conductive rod 53 to perform linear motion.

[0061] The motor 543 drives the screw rod 542 to rotate, and then the connecting tube 541 is pushed to move linearly through the thread, and finally the connecting tube 541 pushes the conductive rod 53 to move. In this process, a support frame needs to be set inside the shell 1 to support the connecting tube 541 and prevent the connecting tube 541 and the screw rod 542 from rotating synchronously. Of course, if the connecting tube 541 and the conductive rod 53 are fixed and the conductive rod 53 does not rotate relative to the conductive arm 52, there is no need to set a limit for the connecting tube 541. On the contrary, if the connecting tube 541 is provided with a limit guide, the conductive rod 53 may not be set. The high-voltage switch assembly 5 is electrically opened and closed by the set motor 543, which can realize the rapid switching of static and dynamic fault tests of this equipment, avoid the possibility of erroneous operation of manual switching, and improve the safety of the test process.

[0062] In order to reduce the space occupied by the motor 543 and facilitate the maintenance and control of the motor 543, the motor 543 is installed outside the housing 1, and the screw rod 542 extends to the outside of the housing 1. The output end of the motor 543 and the end of the screw rod 542 are engaged through two bevel gears for transmission.

[0063] In some embodiments, the high-voltage switch assembly 5 also includes an isolation mechanism 55, which is arranged between the conductive rod 53 and the driving mechanism 54, and is used to electrically isolate the conductive rod 53 from the driving mechanism 54, and to extinguish the arc after the conductive rod 53 leaves the connecting end 51. The setting of the isolation mechanism 55 can improve the stability of the equipment during operation, protect internal components, and prevent tip discharge. The isolation mechanism 55 is specifically arranged between the connecting tube 541 and the conductive rod 53. The isolation mechanism 55 isolates the conductive rod 53 from the motor 543, which can prevent high voltage from damaging the motor 543.

[0064] In one embodiment, the isolation mechanism 55 includes a first disk 551, an insulator 552, a second disk 553, a connecting rod 554 and a movable arm 555. The first disk 551, the insulator 552 and the second disk 553 are fixed in sequence, and the first disk 551 is fixed to the end of the conductive rod 53 away from the connecting end 51. The connecting rod 554 is fixed to the housing 1 and is grounded. The movable arm 555 is hinged on the connecting rod 554, and one end is in contact with the second disk 553. The driving mechanism 54 drives the conductive rod 53 to move through the first disk 551, the insulator 552 and the second disk 553. During the movement of the second disk 553, the movable arm 555 is driven to rotate on the connecting rod 554. When the conductive rod 53 contacts the connecting end 51, the movable arm 555 is not electrically connected to the conductive rod 53. When the conductive rod 53 leaves the connecting end 51, the movable arm 555 is electrically connected to the conductive rod 53.

[0065] The radius of the first plate 551 is smaller than the radius of the second plate 553. When the second plate 553 moves following the movement of the connecting cylinder 541, it will move relative to the connecting rod 554. During the movement, the movable arm 555 is contacted to adjust the angle of the movable arm 555. Specifically, one end of the movable arm 555 extends to the outside of the connecting rod 554, and the movable arm 555 is arranged in an arc shape. When the first plate 551 moves toward the connecting end 51, the second plate 553 approaches the hinge point between the movable arm 555 and the connecting rod 554. At this time, the free end of the movable arm 555 is in the weight. Under the action of force, it moves downward, that is, the movable arm 555 rotates. Conversely, when the first disk 551 moves away from the connecting end 51, the second disk 553 moves in the direction away from the hinge point of the movable arm 555 and the connecting rod 554, that is, the movable arm 555 is pressed to lift one end upward until the movable arm 555 contacts the conductive rod 53. Since the movable arm 555 is grounded through the connecting rod 554, the conductive rod 53 can be grounded instantly when it contacts, thereby extinguishing the arc. The disc-shaped design of the first disk 551 and the second disk 553 can also play a role in equalizing pressure.

[0066] In some embodiments, in order to detect the opening and closing state of the high-voltage switch assembly 5 and the pushing position of its screw rod 542, a position detection probe is also provided. There are two position detection probes, which are fixed in the housing 1 by a bracket. At the same time, a bracket is provided on the second disk 553, and a matching block is installed on the bracket. When the conductive rod 53 is in full contact with the connecting end 51, the matching block is located on the outside of one of the two detection probes and can be detected by the detection probe. When the conductive rod 53 is completely separated from the connecting end 51 and forms a disconnected state, the matching block is located on the outside of the other detection probe and can be detected by the detection probe. The position detection probe can be selected as an infrared sensor switch or a travel switch, etc.

[0067] The GIS fault testing method of the present invention is implemented based on the above-mentioned GIS fault testing device, and specifically includes a GIS static fault testing method and a GIS dynamic fault testing method.

[0068] When conducting a GIS static fault test, the high-voltage switch assembly 5 between the transformer 4 and the discharge model 2 is closed, and the high-voltage switch assembly 5 between the external connection terminal 11 and the coupling capacitor 3 is disconnected. Voltage is provided through the transformer 4, the coupling capacitor 3 collects partial discharge signals, and the discharge model 2 simulates discharge defects.

[0069] When conducting a GIS dynamic fault test, the high-voltage switch assembly 5 between the transformer 4 and the discharge model 2 is disconnected, and the high-voltage switch assembly 5 between the external connection terminal 11 and the coupling capacitor 3 is closed. The external connection terminal 11 is connected to the GIS device, and voltage is provided through the GIS device. The coupling capacitor 3 collects partial discharge signals.

[0070] By switching between static and dynamic tests, static fault test data and dynamic fault test data are obtained. The test data are tested using the current pulse method and high-frequency sensors. Comparing the static / dynamic test data can better determine the fault phenomenon.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A GIS fault test device, characterized in that: It includes a housing (1), a discharge model (2), a coupling capacitor (3), a transformer (4) and two high-voltage switch components (5), wherein: The housing (1) includes an external connection end (11), and the external connection end (11) is used to connect to an external GIS device; The discharge model (2) is arranged in the housing (1), and the discharge model (2) includes a simulation terminal; The coupling capacitor (3) is arranged in the housing (1), and the coupling capacitor (3) includes a collection end, the collection end is electrically connected to the analog end and the external connection end (11) of the discharge model (2), and the coupling capacitor (3) is used to collect partial discharge signals; The transformer (4) is arranged in the housing (1), and the transformer (4) is electrically connected to the simulation end of the discharge model (2); One of the two high-voltage switch assemblies (5) is arranged between the transformer (4) and the discharge model (2) and is used for on-off control of the transformer (4) and the discharge model (2); the other high-voltage switch assembly (5) is arranged between the external connection terminal (11) and the collection terminal of the coupling capacitor (3) and is used for on-off control of the coupling capacitor (3) and the external connection terminal (11); at least one of the two high-voltage switch assemblies (5) is disconnected; The high-voltage switch assembly (5) includes a connection terminal (51), and the connection terminal (51) of the high-voltage switch assembly (5) arranged between the transformer (4) and the discharge model (2) is electrically connected to the analog end of the discharge model (2), the collection end of the coupling capacitor (3), and the connection terminal (51) of another high-voltage switch assembly (5); The high-voltage switch assembly (5) further includes a conductive arm (52), a conductive rod (53) and a drive mechanism (54), wherein: The conductive arm (52) is fixed in the housing (1) and electrically connected to the external connection terminal (11) or the transformer (4); The conductive rod (53) is movably arranged on the conductive arm (52) and is electrically connected to the conductive arm (52). When the conductive rod (53) moves on the conductive arm (52), it can contact or leave the connection end (51); The driving mechanism (54) is fixed on the housing (1) and is in transmission connection with the conductive rod (53) to drive the conductive rod (53) to contact and leave.

2. The GIS fault test device according to claim 1, characterized in that: The housing (1) comprises a first control cavity (101) and a second control cavity (102); the analog end of the discharge model (2) and the acquisition end of the coupling capacitor (3) both extend into the first control cavity (101); a high-voltage switch assembly (5) connecting the transformer (4) and the discharge model (2) is arranged in the first control cavity (101); the external connection end (11) is arranged in the second control cavity (102); and the high-voltage switch assembly (5) connecting the coupling capacitor (3) and the external connection end (11) is arranged in the second control cavity (102).

3. The GIS fault test device according to claim 2, characterized in that: The housing (1) further comprises a connecting housing (12) and at least four branch housings (13); the first control cavity (101) is arranged on the connecting housing (12); each of the branch housings (13) is fixed on the connecting housing (12); and the discharge model (2), coupling capacitor (3), transformer (4) and second control cavity (102) are respectively arranged in the four branch housings (13).

4. The GIS fault testing device according to claim 3, characterized in that: The housing (1) further comprises a plurality of sealing isolators (14), wherein the plurality of sealing isolators (14) are respectively arranged at the connection between the connecting housing (12) and the plurality of branch housings (13) to separate the connecting housing (12) from the branch housings (13).

5. The GIS fault testing device according to claim 1, characterized in that: The driving mechanism (54) includes a connecting tube (541), a screw rod (542) and a motor (543), wherein: The connecting cylinder (541) is disposed in the housing (1) and is fixed to the end of the conductive rod (53); The screw rod (542) extends into the interior of the connecting cylinder (541) and is threadedly connected to the connecting cylinder (541); The motor (543) is fixed on the housing (1), and the output end is transmission-connected to the screw rod (542) so as to drive the conductive rod (53) to perform linear motion by pushing the connecting cylinder (541) through the thread.

6. The GIS fault testing device according to claim 1, characterized in that: The high-voltage switch assembly (5) further comprises an isolation mechanism (55), which is arranged between the conductive rod (53) and the drive mechanism (54) and is used to electrically isolate the conductive rod (53) from the drive mechanism (54) and to extinguish the arc after the conductive rod (53) leaves the connection end (51).

7. The GIS fault testing device according to claim 6, characterized in that: The isolation mechanism (55) includes a first disk (551), an insulator (552), a second disk (553), a connecting rod (554) and a movable arm (555), wherein: The first disk (551), the insulator (552), and the second disk (553) are fixed in sequence, and the first disk (551) is fixed on an end of the conductive rod (53) away from the connection end (51); The connecting rod (554) is fixed to the housing (1) and is grounded; The movable arm (555) is hinged on the connecting rod (554), and one end of the movable arm (555) contacts the second disk (553). The driving mechanism (54) drives the conductive rod (53) to move through the first disk (551), the insulator (552) and the second disk (553). During the movement of the second disk (553), the movable arm (555) is driven to rotate on the connecting rod (554). When the conductive rod (53) contacts the connection end (51), the movable arm (555) is not electrically connected to the conductive rod (53); When the conductive rod (53) leaves the connection end (51), the movable arm (555) is electrically connected to the conductive rod (53).

8. A GIS fault test method, characterized in that: The GIS fault test device according to any one of claims 1 to 7 is implemented, and the GIS fault test method includes: When conducting a GIS static fault test, the high-voltage switch assembly (5) between the transformer (4) and the discharge model (2) is closed, and the high-voltage switch assembly (5) between the external connection terminal (11) and the coupling capacitor (3) is disconnected, voltage is provided through the transformer (4), the coupling capacitor (3) performs partial discharge signal acquisition, and the discharge model (2) performs discharge defect simulation; When conducting a GIS dynamic fault test, the high-voltage switch assembly (5) between the transformer (4) and the discharge model (2) is disconnected, and the high-voltage switch assembly (5) between the external connection terminal (11) and the coupling capacitor (3) is closed, and the external connection terminal (11) is connected to the GIS device, and the voltage is provided by the GIS device, and the coupling capacitor (3) is used to collect the partial discharge signal.

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