GIS fault test device and test method

Abstract

The invention provides a GIS fault test device and test method, and relates to the technical field of GIS test, the GIS fault test device comprises a shell, a discharge model, a coupling capacitor, a transformer and two high-voltage switch assemblies, the shell comprises an external connection end, and the external connection end is used for connecting external GIS equipment; the discharge model is arranged in the shell and comprises a simulation end; the coupling capacitor is arranged in the shell, the coupling capacitor comprises an acquisition end, the acquisition end is electrically connected with the simulation end and the external connection end of the discharge model, and the coupling capacitor is used for acquiring partial discharge signals; and the transformer is arranged in the shell and is electrically connected with the simulation end of the discharge model. According to the invention, through static and dynamic tests, the two data can be compared, and the fault phenomenon of the GIS equipment can be judged more accurately, so that the judgment accuracy is improved.

Description

Technical Field

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

[0002] Gas insulated switchgear is abbreviated as GIS. Since GIS equipment was put into practical use in the 1960s of the 20th century, it has been widely operated all over the world. GIS is not only widely used in the high-voltage and extra-high-voltage fields, but also used in the ultra-high-voltage field. Compared with the conventional open substation, the advantages of GIS are compact structure, small floor area, high reliability, flexible configuration, convenient installation, strong safety, and strong environmental adaptability. Since GIS is a closed device with limited test means and a long maintenance cycle, it is difficult to detect internal defects according to traditional preventive tests or routine tests, or insulation accidents will occur during the test cycle, resulting in huge losses and impacts. In recent years, the live detection technology of power equipment has developed rapidly. For high-voltage switchgear, due to factors such as equipment quality defects and aging after long-term operation, various defects will occur in GIS during long-term operation. These defects will cause partial discharge. By using the live detection technology, these partial discharge signals that may lead to insulation accidents can be detected in advance, which is beneficial to detecting potential defects of GIS equipment in advance.

[0003] Existing GIS defect simulation and verification equipment usually sets 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 carried out in a fixed test chamber, and the test data is only a simulated phenomenon, and it is difficult to accurately judge the fault phenomenon in the real-time operation process of GIS according to the test data. Summary of the Invention

[0004] In view of this, the present invention provides a GIS fault test device and a test method. When conducting a static GIS fault test, the high-voltage switch component between the transformer and the discharge model is closed, and the high-voltage switch component between the external connection end and the coupling capacitor is disconnected. The transformer provides voltage, the coupling capacitor collects partial discharge signals, and the discharge model simulates discharge defects. When conducting a dynamic GIS fault test, the high-voltage switch component between the transformer and the discharge model is disconnected, the high-voltage switch component between the external connection end and the coupling capacitor is closed, and the external connection end is connected to the GIS equipment. The GIS equipment provides voltage, the coupling capacitor collects partial discharge signals. Through static and dynamic tests, by comparing the data of the two, the fault phenomenon of the GIS equipment can be judged more accurately, thereby improving the accuracy of judgment.

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

[0006] On the one hand, the present invention provides a GIS fault test device, which includes a housing, a discharge model, a coupling capacitor, a transformer and two high-voltage switch assemblies. Among them,

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

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

[0009] The coupling capacitor is arranged inside the housing, and the coupling capacitor includes a collection end. The collection end is electrically connected to the simulation end of the discharge model and the external connection end. The coupling capacitor is used to collect partial discharge signals;

[0010] The transformer is arranged inside 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 controlling the on-off 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 controlling the on-off of the coupling capacitor and the external connection end. At least one of the two high-voltage switch assemblies is disconnected.

[0012] On the basis of the above technical solutions, 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 housing further includes a connecting shell and at least four branch shells. The first control cavity is arranged on the connecting shell, and each branch shell is fixed on the connecting shell. The discharge model, the coupling capacitor, the transformer and the second control cavity are respectively arranged in the four branch shells.

[0014] Even more preferably, the housing further includes a plurality of sealed isolation members, and the plurality of sealed isolation members are respectively arranged at the joints of the connecting shell and the plurality of branch shells to separate the connecting shell and the branch shells.

[0015] On the basis of the above technical solutions, preferably, the high-voltage switch assembly includes a connection end head. The high-voltage switch assembly arranged between the transformer and the discharge model has its connection end head electrically connected to the simulation end of the discharge model, the collection end of the coupling capacitor and the connection end head of the other high-voltage switch assembly.

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

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

[0018] The conductive rod is movably arranged on the conductive arm and is 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 housing and is in transmission connection with the conductive rod to drive the conductive rod to contact and leave.

[0020] Further preferably, the driving mechanism includes a connecting cylinder, a lead screw and a motor, wherein,

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

[0022] The lead screw extends into the inside of the connecting cylinder and is in threaded connection with the connecting cylinder;

[0023] The motor is fixed on the housing, and the output end is in transmission connection with the lead screw to drive the connecting cylinder to drive the conductive rod to perform linear motion by means of threading.

[0024] Further preferably, the high-voltage switch assembly further includes an isolation mechanism. The isolation mechanism is arranged between the conductive rod and the driving mechanism and is used for electrically isolating the conductive rod and the driving mechanism and extinguishing the arc after the conductive rod leaves the connection end.

[0025] Further preferably, the isolation mechanism includes a first disc body, an insulator, a second disc body, a connecting rod and a movable arm, wherein,

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

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

[0028] The movable arm is hinged to the connecting rod, and one end is in contact with the second disc body. The driving mechanism drives the conductive rod to move through the first disc body, the insulator and the second disc body. During the movement of the second disc body, the movable arm will be 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] On the other hand, the present invention provides a GIS fault test method, which is realized based on the above GIS fault test device. The GIS fault test method includes:

[0032] When conducting the GIS static fault test, close the high-voltage switch component between the transformer and the discharge model, and disconnect the high-voltage switch component between the external connection end and the coupling capacitor. Provide voltage through the transformer, collect partial discharge signals with the coupling capacitor, and simulate discharge defects with the discharge model.

[0033] When conducting the GIS dynamic fault test, disconnect the high-voltage switch component between the transformer and the discharge model, close the high-voltage switch component between the external connection end and the coupling capacitor, connect the external connection end to the GIS device, provide voltage through the GIS device, and collect partial discharge signals with the coupling capacitor.

[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 the external connection end, transformer, coupling capacitor, and discharge model, when conducting the GIS static fault test, close the high-voltage switch component between the transformer and the discharge model, and disconnect the high-voltage switch component between the external connection end and the coupling capacitor. Provide voltage through the transformer, collect partial discharge signals with the coupling capacitor, and simulate discharge defects with the discharge model. When conducting the GIS dynamic fault test, disconnect the high-voltage switch component between the transformer and the discharge model, close the high-voltage switch component between the external connection end and the coupling capacitor, connect the external connection end to the GIS device, provide voltage through the GIS device, and collect partial discharge signals with the coupling capacitor. Through static and dynamic tests, by comparing the data of the two, the fault phenomenon of the GIS device can be judged more accurately, thereby improving the accuracy of judgment.

[0036] (2) By setting the driving mechanism and correspondingly setting the connecting cylinder, lead screw, and motor, the connecting cylinder is fixed to the end of the conductive rod, the lead screw extends into the connecting cylinder and is threadedly connected to the connecting cylinder, the motor is fixed on the housing, and the output end is in transmission connection with the lead screw. To drive the connecting cylinder to drive the conductive rod to perform linear motion through the thread, the motor controls the opening and closing of the high-voltage switch component, which can realize the rapid switching of the static and dynamic fault tests of the equipment, avoid the possible misoperation of manual switching, and improve the safety of the test process at the same time.

[0037] (3) By setting the isolation mechanism between the conductive rod and the driving mechanism to electrically isolate the conductive rod and the driving mechanism, and extinguish the arc after the conductive rod leaves the connection end head. The setting of the isolation mechanism can improve the stability of the equipment during operation, protect internal components, and prevent tip discharge. The isolation mechanism is specifically set between the connecting cylinder and the conductive rod, and the isolation mechanism isolates the conductive rod and the motor, which can avoid high voltage from damaging the motor. Description of the Drawings

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

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

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

[0041] Figure 3 It is a side view of the high-voltage switch assembly of the GIS fault test device of the present invention. Specific embodiments

[0042] The following will combine the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0043] As Figures 1-3 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 externally connecting end 11, and the externally connecting end 11 is used to connect an external GIS device. Since there are high-voltage devices in the housing 1, the internal environment of the housing 1 needs to have good insulation. To ensure its good insulation performance, an inert gas with a certain pressure can be filled into the interior of the housing 1, and the inert gas can be SF6 gas.

[0045] The discharge model 2 is arranged in the housing 1. The discharge model 2 includes a simulation end, and the discharge model 2 is used to simulate local discharge defects of GIS. The types of simulation include but are not limited to discharge types such as tips, suspensions, air gaps, particles, and surface discharges of GIS devices. Even, the discharge model 2 can be selected as a simulation device that can switch different discharge types, so as to realize static simulation and switching of various discharge defects.

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

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

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

[0049] In this embodiment, by setting the external connection end 11, the transformer 4, the coupling capacitor 3, and the discharge model 2, 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 end 11 and the coupling capacitor 3 is disconnected. The transformer 4 provides voltage, the coupling capacitor 3 collects partial discharge signals, and the discharge model 2 simulates discharge defects. When conducting a GIS dynamic fault test, the on / off states of the two high-voltage switch assemblies 5 are opposite. Then, voltage is provided by connecting the coupling capacitor 3 through the GIS device, and the coupling capacitor 3 collects the dynamic partial discharge signals of the GIS device. Through static and dynamic tests, by comparing the data of the two, the fault phenomenon of the GIS device can be judged more accurately, thereby improving the accuracy of the judgment.

[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 gases inside are completely isolated. The simulation end of the discharge model 2 and the acquisition 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 inside the first control chamber 101 and the second control chamber 102 respectively, so that there will be no mutual interference during the opening and closing process. At the same time, when performing maintenance operations on the two high-voltage switch assemblies 5 through the first control chamber 101 and the second control chamber 102 respectively, only the gas in one of the first control chamber 101 and the second control chamber 102 needs to be replaced, thereby reducing the maintenance cost.

[0051] In a specific embodiment, the housing 1 further includes a connecting shell 12 and at least four branch shells 13. The first control chamber 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, the coupling capacitor 3, the transformer 4 and the second control chamber 102 are respectively arranged in the four branch shells 13.

[0052] The connecting shell 12 and the branch shells 13 can be made of stainless steel. For the convenience of explaining this embodiment, four branch shells 13 are set as an example. Four openings are provided on the connecting shell 12, and each opening is connected to a branch shell 13. A ninety-degree angle is formed between two adjacent branch shells 13. Among them, the discharge model 2, the coupling capacitor 3, and the transformer 4 are each installed in a branch shell 13, and electrical isolation is also done well. The remaining branch shell 13 installs the high-voltage switch assembly 5 connecting the external connection end 11 and the coupling capacitor 3. In the middle connecting shell 12, another high-voltage switch assembly 5 is arranged inside. 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, which are filled with inert gas to ensure the insulation condition of the device during operation. 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 the electrical connector.

[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, and its 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. The connecting terminal 51 needs to have a certain arc extinguishing ability because it needs to perform on-off control of high-voltage electricity. 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 outer shell 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 outer shell 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, so as to protect the driving mechanism 54.

[0058] The conductive arm 52 is perpendicular to the conductive rod 53 as a whole. A guiding sleeve is provided on the conductive arm 52. The guiding sleeve is sleeved outside the conductive rod 53 and contacts the conductive rod 53. To prevent the conductive rod 53 from rotating relative to the guiding sleeve on the conductive arm 52, a slotted groove can be opened on the conductive rod 53, and a limiting member can be added inside the guiding sleeve so that the limiting member is inserted into the slotted groove. Or, the conductive rod 53 can be set as a polygon and the guiding sleeve head is adapted to it, so as to realize that the conductive rod 53 can move and have a stable electrical connection with the conductive arm 52. Under this setting, with the linear drive of the conductive rod 53 by the driving mechanism 54, the conductive rod 53 can contact or leave the corresponding connection end 51, so as to realize the opening and closing control of the high-voltage switch assembly 5 and complete the on-off operation in electricity. In addition, a voltage equalizing structure can also be set at the end of the conductive rod 53 to avoid tip discharge.

[0059] Specifically, the conductive arm 52 of the high-voltage switch assembly 5 provided 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 provided in the second control cavity 102 is electrically connected to the external connection end 11.

[0060] In some embodiments, the driving mechanism 54 includes a connecting cylinder 541, a lead screw 542 and a motor 543. The connecting cylinder 541 is arranged in the housing 1 and fixed to the end of the conductive rod 53. The lead screw 542 extends into 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 in transmission connection with the lead screw 542 to drive the connecting cylinder 541 to drive the conductive rod 53 to perform a linear motion through the thread.

[0061] The motor 543 drives the lead screw 542 to rotate, and then the connecting cylinder 541 is linearly moved by pushing through the thread. Finally, the connecting cylinder 541 pushes the conductive rod 53 to move. In this process, a support frame also needs to be arranged inside the housing 1 to support the connecting cylinder 541 through the support frame and prevent the connecting cylinder 541 and the lead screw 542 from rotating synchronously. Of course, if the connecting cylinder 541 is fixed to the conductive rod 53 and the conductive rod 53 will not rotate relative to the conductive arm 52, there is no need to set a limit for the connecting cylinder 541. On the contrary, if the connecting cylinder 541 is provided with a limit guide, the conductive rod 53 may not be provided. By setting the motor 543 to perform the electric control opening and closing of the high-voltage switch assembly 5, the rapid switching of the static and dynamic fault tests of the device can be realized, and the possible misoperation of manual switching can be avoided, and the safety of the test process can be improved at the same time.

[0062] 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 lead screw 542 extends to the outside of the housing 1. The output end of the motor 543 is driven by meshing with the end of the lead screw 542 through two bevel gears.

[0063] In some embodiments, the high-voltage switch assembly 5 further includes an isolation mechanism 55. The isolation mechanism 55 is disposed between the conductive rod 53 and the driving mechanism 54 for electrically isolating the conductive rod 53 and the driving mechanism 54 and extinguishing the arc after the conductive rod 53 leaves the connection end 51. The setting of the isolation mechanism 55 can improve the stability during the operation of the device, protect the internal components, and prevent tip discharge at the same time. The isolation mechanism 55 is specifically disposed between the connection cylinder 541 and the conductive rod 53. The isolation mechanism 55 isolates the conductive rod 53 from the motor 543, which can avoid damaging the motor 543 due to high voltage.

[0064] In a certain embodiment, the isolation mechanism 55 includes a first disc body 551, an insulator 552, a second disc body 553, a connecting rod 554, and a movable arm 555. The first disc body 551, the insulator 552, and the second disc body 553 are fixed in sequence, and the first disc body 551 is fixed to the end of the conductive rod 53 away from the connection end 51. The connecting rod 554 is fixed to the housing 1 and grounded. The movable arm 555 is hinged to the connecting rod 554 and contacts the second disc body 553 at one end. The driving mechanism 54 drives the conductive rod 53 to move through the first disc body 551, the insulator 552, and the second disc body 553. During the movement of the second disc body 553, the movable arm 555 will be 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.

[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 connection tube 541, it moves relative to the connection 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 connection rod 554, and the movable arm 555 is arranged in an arc shape. When the first plate 551 moves toward the connection end 51, the second plate 553 approaches the hinge point between the movable arm 555 and the connection 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 body 551 moves away from the connecting end 51, the second disk body 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 of the movable arm 555 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 body 551 and the second disk body 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 terminal 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 terminal 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 sensing switch or a travel switch, etc.

[0067] The GIS fault test method of the present invention is implemented based on the above-mentioned GIS fault test device, and specifically includes a GIS static fault test method and a GIS dynamic fault test 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, the voltage is provided through the transformer 4, the coupling capacitor 3 performs partial discharge signal collection, and the discharge model 2 performs discharge defect simulation.

[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, and the external connection terminal 11 is connected to the GIS device. The voltage is provided by the GIS device, and the coupling capacitor 3 collects the partial discharge signal.

[0070] By switching between static tests and dynamic tests, static fault test data and dynamic fault test data are obtained. The test data is tested through the current pulse method and high-frequency sensors. Static / dynamic tests can better judge the fault phenomenon by comparing the two sets of data.

[0071] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A GIS fault test device, characterized in that: It comprises 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) comprises 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) comprises a simulation terminal; The coupling capacitor (3) is arranged in the housing (1), and the coupling capacitor (3) comprises a collection end, the collection end is electrically connected to the simulation 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.

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 collection 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 shell (12) and at least four branch shells (13); the first control chamber (101) is arranged on the connecting shell (12); each of the branch shells (13) is fixed on the connecting shell (12); and the discharge model (2), coupling capacitor (3), transformer (4) and second control chamber (102) are respectively arranged in the four branch shells (13).

4. The GIS fault test 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 points between the connecting housing (12) and the plurality of branch housings (13) so as to separate the connecting housing (12) from the branch housings (13).

5. The GIS fault test device according to claim 1, characterized in that: The high-voltage switch component (5) comprises a connection terminal (51), the high-voltage switch component (5) being arranged between the transformer (4) and the discharge model (2), the connection terminal (51) of which is electrically connected to an analog terminal of the discharge model (2), a collection terminal of a coupling capacitor (3), and a connection terminal (51) of another high-voltage switch component (5).

6. The GIS fault test device according to claim 5, characterized in that: The high-voltage switch assembly (5) further comprises a conductive arm (52), a conductive rod (53) and a driving mechanism (54), wherein: 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 drivingly connected to the conductive rod (53) to drive the conductive rod (53) to make contact and leave.

7. The GIS fault test device according to claim 6, characterized in that: The driving mechanism (54) comprises a connecting tube (541), a screw rod (542) and a motor (543), wherein: The connecting tube (541) is arranged 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 tube (541) and is threadedly connected to the connecting tube (541); The motor (543) is fixed on the housing (1), and the output end is drivingly connected to the screw rod (542) so as to drive the conductive rod (53) to perform linear motion by pushing the connecting tube (541) through the thread.

8. The GIS fault test device according to claim 6, 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 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 connection end (51).

9. The GIS fault test device according to claim 8, characterized in that: The isolation mechanism (55) comprises 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 on the housing (1) and grounded; The movable arm (555) is hinged on the connecting rod (554), and one end of the movable arm (555) 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 connection 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).

10. A GIS fault test method, characterized in that: The GIS fault test device according to any one of claims 1 to 9 is implemented, and the GIS fault test method comprises: 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, a voltage is provided through the transformer (4), the coupling capacitor (3) collects partial discharge signals, and the discharge model (2) simulates discharge defects; 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 end (11) and the coupling capacitor (3) is closed, and the external connection end (11) is connected to the GIS device, and a voltage is provided through the GIS device, and the coupling capacitor (3) collects partial discharge signals.

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