High-voltage DC GIL internal insulation performance examination test device and test method

Abstract

The invention provides a high-voltage DC GIL internal insulation performance examination test device and test method. The device comprises: a GIL simulation housing; the first test basin-type insulator and the second test basin-type insulator are enclosed in the GIL simulation shell to form a closed test space; the movable plugging conductor can move along the axial direction of the GIL simulation housing. The high-voltage connection assembly is connected with the first test basin-type insulator, and each test basin-type insulator is electrically connected with the movable plugging conductor. According to the invention, the movable plugging conductor drives the two contact connectors at the two ends to carry out reciprocating rectilinear motion to generate friction, the reciprocating motion of the high-voltage direct-current GIL contact plugging structure in actual operation is simulated, the influence of foreign matters generated by contact wear on the internal insulation performance of the high-voltage direct-current GIL is assessed, and the reliability of the high-voltage direct-current GIL contact plugging structure is improved. The purpose of verifying the long-term operation performance of the internal structure of the high-voltage DC GIL is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to a high-voltage direct current GIL internal insulation performance assessment test device and test method. Background Art

[0002] Gas-insulated Metal-enclosed Transmission Line (GIL) is a transmission line filled with high-performance insulating gas, with a grounded casing and internal high-voltage conductors arranged coaxially through insulating parts. The current-carrying conductor of GIL is usually connected by several sections of aluminum tubes through a contact plug-in structure. During operation, due to changes in external temperature and grid load, the length of the current-carrying conductor will change accordingly, and relative friction will occur repeatedly at the plug-in structure, generating metal foreign matter, which may have a bad effect on the internal insulation of GIL. High-voltage DC GIL has a longer transmission distance and more internal plug-in structures. At the same time, its failure will have more serious consequences for the power system. Therefore, it is necessary to strictly evaluate the impact of contact friction foreign matter on the internal part of high-voltage DC GIL.

[0003] At present, most of the research on foreign matter inside DC GIL is based on manually placed foreign matter with regular shapes, and studies on aspects such as foreign matter movement, discharge voltage, and particle collectors, which are quite different from the actual operating conditions. Research on the plug-in structure of DC GIL mainly focuses on the wear of contacts and the impact on current carrying capacity after mechanical movement, and lacks an assessment of the impact on the internal insulation of GIL. Summary of the invention

[0004] In view of this, the present invention proposes a high-voltage DC GIL internal insulation performance assessment test device and test method, aiming to solve the problem that the existing DC GIL insulation performance test cannot accurately simulate the actual operating conditions.

[0005] The present invention proposes a high-voltage direct current GIL internal insulation performance assessment test device, which includes: a GIL simulation shell; a first test pot insulator and a second test pot insulator, which are arranged side by side and at intervals inside the GIL simulation shell along the axial direction of the GIL simulation shell, and a closed test space is formed between the first test pot insulator and the second test pot insulator inside the GIL simulation shell, and plug-in contact seats are provided on opposite sides of the first test pot insulator and the second test pot insulator; a movable plug-in conductor is arranged between the first test pot insulator and the second test pot insulator along the axial direction of the GIL simulation shell, and the movable plug-in conductor Both ends are provided with contact connectors compatible with the plug-in contact seat, the contact connector is plugged into the corresponding plug-in contact seat, the movable plug-in conductor can move along the axial direction of the GIL simulation shell, and is used to drive the contact connector to move back and forth in a straight line, so that friction is generated between the contact connector and the plug-in contact seat to simulate the friction of the contact plug-in structure inside the high-voltage DC GIL; a high-voltage connection assembly is connected to the first test basin insulator, and each of the test basin insulators is electrically connected to the movable plug-in conductor. The high-voltage connection assembly is used to connect the high-voltage line to introduce high voltage to the movable plug-in conductor, so as to assess the influence of foreign matter generated by contact friction on the internal insulation performance of the high-voltage DC GIL.

[0006] Furthermore, in the above-mentioned high-voltage DC GIL internal insulation performance assessment test device, the movable pluggable conductor is connected to a push-pull operating mechanism, which is connected to the movable pluggable conductor and is used to drive the movable pluggable conductor to perform reciprocating linear motion.

[0007] Furthermore, in the above-mentioned high-voltage DC GIL internal insulation performance assessment test device, the push-pull operating mechanism includes: a push-pull driving member, which is arranged on the outside of the GIL simulation shell; a transmission assembly, whose two ends are respectively connected to the power output end of the push-pull driving member and the movable pluggable conductor, and is used to drive the movable pluggable conductor to perform reciprocating linear motion under the drive of the push-pull driving member, so as to generate friction between the pluggable contact seat and the contact connector at both ends of the movable pluggable conductor.

[0008] Furthermore, in the above-mentioned high-voltage DC GIL internal insulation performance assessment test device, the transmission assembly includes: a first transmission member, which is arranged on the outside of the GIL simulation shell, and one end of the first transmission member is connected to the power output end of the push-pull drive member; a second transmission member, which is inserted into the GIL simulation shell along the axial direction of the GIL simulation shell in a manner capable of linear motion, and the end of the second transmission member placed outside the GIL simulation shell is connected to the other end of the first transmission member, and the end of the second transmission member placed inside the GIL simulation shell is connected to the movable pluggable conductor.

[0009] Furthermore, in the above-mentioned high-voltage DC GIL internal insulation performance assessment test device, the second transmission member is an insulating member, and the second transmission member is connected to the end of the GIL simulation shell through a sliding sealing structure.

[0010] Furthermore, in the above-mentioned high-voltage DC GIL internal insulation performance assessment test device, the high-voltage connection assembly includes: an auxiliary pot-type insulator, the side of the GIL simulation shell is provided with a high-voltage introduction port on one side of the enclosed test space, the auxiliary pot-type insulator is arranged at the high-voltage introduction port, and is used to seal the high-voltage introduction port, and the conductor part of the auxiliary pot-type insulator is used to connect the high-voltage connecting line placed outside the GIL simulation shell to introduce high voltage; an auxiliary conductor, the two ends of which are respectively connected to the conductor part of the auxiliary pot-type insulator and the first test pot-type insulator, and are used to conduct the high voltage introduced by the high-voltage connecting line to the first test pot-type insulator.

[0011] Furthermore, in the above-mentioned high-voltage DC GIL internal insulation performance assessment test device, the two ends of the GIL simulation shell are arranged with openings, the second test pot-type insulator is arranged at one opening of the GIL simulation shell, and a sealing plate is provided at the other opening of the GIL simulation shell, and the second test pot-type insulator and the sealing plate are used to axially seal the GIL simulation shell at both ends; the first test pot-type insulator and the second test pot-type insulator are arranged in the same direction; the high-voltage connection assembly and the first test pot-type insulator are sequentially arranged between the sealing plate and the second test pot-type insulator along the axial direction of the GIL simulation shell.

[0012] On the other hand, the present invention also proposes a high-voltage direct current GIL internal insulation performance assessment test method, which adopts a high-voltage direct current GIL internal insulation performance assessment test device for assessment, and the assessment test method comprises the following steps: pre-cleaning the high-voltage direct current GIL internal insulation performance assessment test device; after cleaning, driving the movable plug-in conductor to reciprocate linear motion, and applying a positive polarity voltage to the movable plug-in conductor through the high-voltage connection assembly, and increasing the voltage to the target voltage by a step-by-step voltage step-up method; and monitoring whether there is a partial discharge signal in the assessment test device during the test process, and recording the change of the partial discharge value with time, until the movable plug-in conductor performs a preset number of reciprocating linear motions, and then stopping the application of voltage to the movable plug-in conductor and the reciprocating linear motion of the movable plug-in conductor. The drive of the linear motion is carried out, and the high-voltage connection component is grounded; wherein the target voltage is the operating voltage value of the high-voltage direct current GIL; after the high-voltage connection component is grounded for a preset time period, a negative polarity test is carried out again, the movable pluggable conductor is driven to reciprocate linear motion, and a negative polarity voltage is applied to the movable pluggable conductor through the high-voltage connection component, and the voltage is increased to the target voltage by a step-by-step voltage step-up method; whether there is a partial discharge signal during the test process is monitored, and the change of the partial discharge value with time is recorded until the movable pluggable conductor stops after performing a preset number of reciprocating linear motions; according to whether there is a partial discharge signal in the assessment test device during the positive polarity voltage test and the change of the partial discharge value with time during the negative polarity voltage test, the internal insulation performance of the high-voltage direct current GIL is evaluated.

[0013] Furthermore, the above-mentioned high-voltage DC GIL internal insulation performance assessment test method, before driving the movable pluggable conductor to perform reciprocating linear motion, also includes the following steps: determining the maximum deformation of the high-voltage DC GIL basic unit length due to thermal expansion and contraction based on the length of the high-voltage DC GIL current-carrying conductor, the thermal expansion coefficient of the high-voltage DC GIL current-carrying conductor and the allowable temperature difference of the high-voltage DC GIL; determining a single movement stroke of the reciprocating linear motion of the movable pluggable conductor based on the maximum deformation of the high-voltage DC GIL basic unit length due to thermal expansion and contraction, so as to drive the movable pluggable conductor based on the single movement stroke of the reciprocating linear motion of the movable pluggable conductor.

[0014] Furthermore, in the above-mentioned high-voltage direct current GIL internal insulation performance assessment test method, the maximum deformation of the high-voltage direct current GIL basic unit length due to thermal expansion and contraction is calculated using the following formula: δ m = L × k × T; Among them, δ mis the maximum deformation of the basic unit length of the high-voltage DC GIL due to thermal expansion and contraction, L is the length of the current-carrying conductor of the high-voltage DC GIL, k is the thermal expansion coefficient of the current-carrying conductor of the high-voltage DC GIL, and T is the allowable temperature difference of the high-voltage DC GIL.

[0015] The present invention provides a high-voltage direct current GIL internal insulation performance assessment test device and test method. A second test basin insulator inside a GIL simulation shell can be installed in the GIL simulation shell to form a closed test space, so as to perform an insulation performance assessment test on the closed test space, detect whether there is a partial discharge signal and the change of the partial discharge value over time, and then evaluate the influence of frictional foreign matter on the insulation performance; a movable plug-in conductor drives two contact connectors at both ends to perform reciprocating linear motion, so that the contact connectors can slide in the corresponding plug-in contact seats, and generate friction during the reciprocating linear motion, simulating the reciprocating motion of the high-voltage direct current GIL contact plug-in structure in actual operation, introducing high voltage through a high-voltage connection assembly, and assessing the influence of frictional foreign matter generated by the friction between the contact connector and the plug-in contact seat on the internal insulation performance of the high-voltage direct current GIL, as an assessment of the influence of contact wear on the internal insulation of the GIL, that is, assessing the influence of foreign matter generated by contact wear on the internal insulation performance of the high-voltage direct current GIL, so as to achieve the purpose of verifying the long-term operating performance of the internal structure of the high-voltage direct current GIL. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 A schematic diagram of the structure of a high-voltage DC GIL internal insulation performance assessment test device provided in an embodiment of the present invention; Figure 2 A flowchart of a method for evaluating the internal insulation performance of a high-voltage direct current GIL provided in an embodiment of the present invention; Figure 3 Another flowchart of the high-voltage DC GIL internal insulation performance assessment test method provided by the embodiment of the present invention. DETAILED DESCRIPTION

[0017] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0018] Device Example: See also Figure 1 , which is a schematic diagram of the structure of the high-voltage DC GIL internal insulation performance assessment test device provided by an embodiment of the present invention. As shown in the figure, the GIL simulation housing 1, the first test basin insulator 2, the second test basin insulator 3, the movable pluggable conductor 4 and the high-voltage connection assembly 5.

[0019] The first test pot insulator 2 and the second test pot insulator 3 are arranged side by side and at intervals inside the GIL simulation shell 1 along the axial direction of the GIL simulation shell 1, and a closed test space is formed between the first test pot insulator 2 and the second test pot insulator 3 inside the GIL simulation shell 1, and plug-in contact seats 6 are provided on opposite sides of the first test pot insulator 2 and the second test pot insulator 3.

[0020] Specifically, the GIL simulation housing 1 may be a metal housing, which may be a cylindrical structure. The first test pot insulator 2 is installed inside the GIL simulation housing 1. The second test pot insulator 3 may be installed inside the GIL simulation housing 1 and placed on one side of the first test pot insulator 2 (e.g. Figure 1As shown on the right side, the first test pot insulator 2 and the second test pot insulator 3 are arranged side by side and spaced along the axial direction of the GIL simulation shell 1, and the outer edges of the first test pot insulator 2 and the second test pot insulator 3 are connected to the inner wall of the GIL simulation shell 1, so that the first test pot insulator 2 and the second test pot insulator 3 are enclosed in the GIL simulation shell 1 to form a closed test space, so as to perform insulation performance assessment tests on the closed test space, detect whether there is a partial discharge signal and the change of the partial discharge value over time, and then evaluate the influence of friction foreign matter on the insulation performance. In this embodiment, the first test pot insulator 2 and the second test pot insulator 3 are arranged in the same direction. For example, in this embodiment, the concave surfaces of the first test pot insulator 2 and the second test pot insulator 3 are arranged to the right, and the convex surfaces are arranged to the left, so as to simulate the internal structure of the actual high-voltage DC GIL. Of course, the arrangement direction of the first test pot insulator 2 and the second test pot insulator 3 can also be arranged in the opposite direction. In this embodiment, there is no limitation on it. It can be arranged according to the actual application to simulate the actual arrangement. The first test pot insulator 2 and the second test pot insulator 3 are arranged in the same direction so that the concave surface of one of the two test pot insulators is placed in the closed test space, and the convex surface of the other test pot insulator is placed in the closed test space, thereby performing simultaneous assessment tests on the two electric field distributions. Figure 1 The right side of the second test pot insulator 3 is provided with a plug-in contact seat 6, and the convex surface of the second test pot insulator 3 (such as Figure 1 A plug-in contact holder 6 is installed on the left side shown.

[0021] The movable pluggable conductor 4 is arranged between the first test pot insulator 2 and the second test pot insulator 3 along the axial direction of the GIL simulation housing 1, and both ends of the movable pluggable conductor 4 are provided with contact connectors (not shown in the figure) adapted to the pluggable contact seat 6. The contact connector is plugged into the corresponding pluggable contact seat 6. The movable pluggable conductor 4 can move along the axial direction of the GIL simulation housing 1, and is used to drive the contact connector to move back and forth in a straight line, so that friction is generated between the contact connector and the pluggable contact seat 6 to simulate the friction of the contact plugging structure inside the high-voltage DC GIL.

[0022] Specifically, the movable pluggable conductor 4 can be a movable metal conductor, which can be a tubular structure, with contact connectors adapted to the pluggable contact seat 6 at both ends, so as to be inserted into the pluggable contact seats 6 provided on the first test basin insulator 2 and the second test basin insulator 3, respectively, and there is also an axial gap between the two contact connectors and the corresponding pluggable contact seats 6, so that the two contact connectors can slide axially in the corresponding pluggable contact seats 6, simulating the reciprocating motion of the high-voltage DC GIL contact plug-in structure in actual operation, and the axial sliding between the contact connector and the pluggable contact seat 6 generates friction foreign matter, so as to simulate the metal foreign matter generated by repeated relative friction at the internal plug-in structure of the high-voltage DC GIL. In this embodiment, the movable pluggable conductor 4 is connected to a push-pull operating mechanism 7, which is connected to the movable pluggable conductor 4 and is used to drive the movable pluggable conductor 4 to perform reciprocating linear motion to simulate the repeated relative friction at the contact plug-in structure in the current-carrying conductor of the GIL. Among them, the push-pull operating mechanism 7 provides a single direction (such as Figure 1 The push-pull driving force of the movable pluggable conductor 4 (in the horizontal direction shown) is connected to the movable pluggable conductor 4 to drive the movable pluggable conductor 4 to reciprocate linearly along the axial direction of the GIL simulation housing 1.

[0023] The high-voltage connection assembly 5 is connected to the first test pot-type insulator 2, and each test pot-type insulator 2 is electrically connected to the movable pluggable conductor 4. The high-voltage connection assembly 5 is used to connect the high-voltage line to introduce high voltage to the movable pluggable conductor 4, and then evaluate the influence of foreign matter generated by contact friction on the internal insulation performance of the high-voltage DC GIL.

[0024] Specifically, the high-voltage connection assembly 5 can be arranged on the left side of the first test basin insulator 2, one end of the high-voltage connection assembly 5 can be connected to the high-voltage line placed outside the GIL simulation housing 1 for introducing high voltage, and the other end of the high-voltage connection assembly 5 can be connected to the conductor portion of the first test basin insulator 2, and the first test basin insulator 2 and the movable pluggable conductor 4 are electrically connected to the corresponding pluggable contact seat 6 through the contact connector, that is, the contact connector and the corresponding pluggable contact seat 6 are both conductor structures, and the pluggable contact seat 6 and the first test basin The conductor part of the insulator 2 is in contact and connected, and the contact connector is respectively in contact and connected with the pluggable contact seat 6 and the movable pluggable conductor 4, so as to realize conductivity, so as to guide the high voltage introduced by the high-voltage line to the movable pluggable conductor 4, and simulate the current-carrying conductor of the GIL through the movable pluggable conductor 4. By examining the influence of friction foreign matter generated by the friction between the contact connector and the pluggable contact seat 6 on the internal insulation performance of the high-voltage DC GIL, and taking the influence of the wear of the contact on the internal insulation of the GIL as an examination, the purpose of verifying the long-term operating performance of the internal structure of the high-voltage DC GIL is achieved.

[0025] Continue to see Figure 1The two ends of the GIL simulation housing 1 are opened, and the second test pot insulator 3 is set at an opening of the GIL simulation housing 1 (such as Figure 1 The GIL simulates another opening of the housing 1 (as shown in the right side) Figure 1 A sealing plate 8 is provided at the left side of the second test pot insulator 3, and the second test pot insulator 3 and the sealing plate 8 are used to seal the GIL simulation housing 1 at both ends axially.

[0026] Specifically, the two ends and the side of the GIL simulation housing 1 are open, and the second test pot insulator 3 is installed at an opening of the GIL simulation housing 1, that is, it is installed at the right end of the GIL simulation housing 1, with the convex surface facing downward inside the GIL simulation housing 1. The high-voltage connection assembly 5 can be installed at the side opening of the GIL simulation housing 1, that is, the high-voltage connection assembly 5, the first test pot insulator 2 are sequentially arranged between the sealing plate 8 and the second test pot insulator 3 along the axial direction of the GIL simulation housing 1, that is, along the axial direction of the GIL simulation housing 1, the sealing plate 8, the high-voltage connection assembly 5, the first test pot insulator 2 and the second test pot insulator 3 are sequentially arranged from left to right. The high-voltage connection assembly 5 is connected to the conductor part of the first test pot insulator 2, and the other end opening of the GIL simulation housing 1 is sealed by the sealing plate 8. Among them, the sealing plate 8 can be a metal plate.

[0027] Continue to see Figure 1 The high voltage connection assembly 5 includes: an auxiliary pot-type insulator 51 and an auxiliary conductor 52; wherein the side of the GIL simulation housing 1 is on one side of the closed test space (such as Figure 1 A high-voltage inlet 11 is provided on the left side of the GIL simulation shell 1, and an auxiliary pot-type insulator 51 is arranged at the high-voltage inlet 11 to seal the high-voltage inlet 11. In addition, the conductor part of the auxiliary pot-type insulator 51 is used to connect the high-voltage connecting line placed outside the GIL simulation shell 1 to introduce high voltage; the two ends of the auxiliary conductor 52 are respectively connected to the conductor part of the auxiliary pot-type insulator 51 and the first test pot-type insulator 2, so as to conduct the high voltage introduced by the high-voltage connecting line to the first test pot-type insulator 2.

[0028] Specifically, a high-voltage inlet 11 is provided on the side of the GIL simulation housing 1 near the left opening, and the first test pot-type insulator 2 is placed on the right side of the high-voltage inlet 11, so as to cooperate with the second test pot-type insulator 3 on the right side of the high-voltage inlet 11 to form a closed test space. The auxiliary pot-type insulator 51 is arranged at the high-voltage inlet 11, with the convex surface facing upward and the concave surface facing downward. Of course, it can also be arranged in the opposite direction. There is no limitation on it in this embodiment, and the specific setting direction can be arranged according to the actual situation to simulate the actual structure. The auxiliary pot-type insulator 51 is connected to the first test pot-type insulator 2 through the auxiliary conductor 52, so as to apply voltage to the first test pot-type insulator 2 and the movable plug-in conductor 4 through the auxiliary conductor 52, and can be grounded after the test.

[0029] Continue to see Figure 1 The push-pull operating mechanism 7 may include: a push-pull driving member 71 and a transmission assembly 72; wherein the push-pull driving member 71 is arranged outside the GIL simulation housing 1; the two ends of the transmission assembly 72 are respectively connected to the power output end of the push-pull driving member 71 and the movable pluggable conductor 4, and are used to drive the movable pluggable conductor 4 to perform reciprocating linear motion under the drive of the push-pull driving member 71, so as to generate friction between the pluggable contact seat 6 and the contact connector at both ends of the movable pluggable conductor 4.

[0030] Specifically, the push-pull drive member 71 can provide a single-direction driving force along the axial direction of the GIL simulation shell 1 to drive the transmission assembly 72 to perform reciprocating linear motion along the axial direction of the GIL simulation shell 1, thereby driving the movable pluggable conductor 4 to perform reciprocating linear motion along the axial direction of the GIL simulation shell 1, so that the contact connectors at both ends of the movable pluggable conductor 4 can slide in the corresponding pluggable contact seat 6 to generate friction, simulating the situation in which metal foreign matter is generated by repeated relative friction at the plug-in structure due to the change in the length of the current-carrying conductor inside the GIL.

[0031] In this embodiment, the transmission assembly 72 includes: a first transmission member 721 and a second transmission member 722; wherein the first transmission member 721 is disposed outside the GIL simulation housing 1, and one end of the first transmission member 721 (such as Figure 1 The left end shown in the figure) is connected to the power output end of the push-pull driving member 71; the second transmission member 722 is arranged in the GIL simulation housing 1 along the axial direction of the GIL simulation housing 1 in a manner that can perform linear motion, and the second transmission member 722 is placed at the end of the GIL simulation housing 1 (as shown in the figure) outside the GIL simulation housing 1. Figure 1 The left end shown in FIG. 1 and the other end of the first transmission member 721 (as shown in FIG. Figure 1 The second transmission member 722 is disposed at the end portion (as shown in the right end) in the GIL simulation housing 1. Figure 1 The right end shown in the figure is connected to the movable pluggable conductor 4.

[0032] Specifically, the first transmission member 721 can be a metal member, and of course it can also be other materials with high strength. The second transmission member 722 is an insulating member, which is inserted into the sealing plate 8 along the axial direction of the GIL simulation housing 1 in a manner that can perform linear motion. In order to ensure the sealing inside the GIL simulation housing 1, preferably, the second transmission member 722 is connected to the end of the GIL simulation housing 1, that is, the sealing plate 8, through a sliding sealing structure to improve the sliding sealing of the second transmission member 722 at the sealing plate 8. Among them, the push-pull drive member 71 can provide a push-pull driving force in a single direction, which is connected to the first transmission member 721 and then connected to the second transmission member 722. The second transmission member 722 enters the interior of the GIL simulation housing 1 through the sliding sealing structure and is connected to the movable plug-in conductor 4.

[0033] In this embodiment, the inner diameter of the GIL simulation shell 1, the outer diameter of the movable pluggable conductor 4, the pluggable contact seat 6, etc. are adapted to the actual structure to simulate the actual structure of the high-voltage DC GIL, thereby improving the accuracy of the internal insulation performance assessment test of the high-voltage DC GIL.

[0034] In summary, the high-voltage DC GIL internal insulation performance assessment test device provided in this embodiment can be installed in the GIL simulation shell 1 through the second test basin insulator 3 inside the GIL simulation shell 1 to form a closed test space, so as to perform an insulation performance assessment test on the closed test space, detect whether there is a partial discharge signal and the change of the partial discharge value over time, and then evaluate the influence of frictional foreign matter on the insulation performance; the two contact connectors at both ends are driven by the movable plug-in conductor 4 to perform reciprocating linear motion, so that the contact connectors can slide in the corresponding plug-in contact seat 6, and generate friction during the reciprocating linear motion, simulating the reciprocating motion of the high-voltage DC GIL contact plug-in structure in actual operation, introducing high voltage through the high-voltage connection assembly 5, and assessing the influence of frictional foreign matter generated by the friction between the contact connector and the plug-in contact seat 6 on the internal insulation performance of the high-voltage DC GIL, as an assessment of the influence of contact wear on the internal insulation of the GIL, that is, assessing the influence of foreign matter generated by contact wear on the internal insulation performance of the high-voltage DC GIL, so as to achieve the purpose of verifying the long-term operating performance of the internal structure of the high-voltage DC GIL.

[0035] Method Example: See also Figure 2 , which is a flowchart of a high-voltage DC GIL internal insulation performance assessment test method provided by an embodiment of the present invention. As shown in the figure, the test method includes the following steps: Step S1, pre-cleaning the internal insulation performance assessment test device of the high voltage direct current GIL.

[0036] Specifically, the surfaces of the first test basin insulator 2, the second test basin insulator 3, the auxiliary basin insulator 51 and the second transmission part 722 are first cleaned with non-woven cloth and blown with a deionizing fan; then the outer surfaces of the movable pluggable conductor 4 and the pluggable contact seat 6 are cleaned with non-woven cloth; finally, the inner surface of the GIL simulation shell 1 is cleaned with a high-suction vacuum cleaner.

[0037] Step S2, after the cleaning is completed, the movable pluggable conductor is driven to reciprocate linear motion, and a positive polarity voltage is applied to the movable pluggable conductor through the high-voltage connection assembly, and the voltage is increased to the target voltage by a step-by-step voltage step-up method; and during the test, it is monitored to assess whether there is a partial discharge signal in the test device, and the change of the partial discharge value over time is recorded until the movable pluggable conductor performs a preset number of reciprocating linear motions, then the application of voltage to the movable pluggable conductor and the driving of the reciprocating linear motion of the movable pluggable conductor are stopped, and the high-voltage connection assembly is grounded; wherein, the target voltage is the operating voltage value of the high-voltage DC GIL.

[0038] Specifically, after the cleaning is completed, the GIL simulation shell 1 is first sealed, and an insulating gas, such as SF6, is filled into the interior until the internal pressure of the GIL simulation shell 1 reaches a preset pressure, so that the internal gas environment is consistent with the actual GIL. Then, the push-pull drive 71 is started to drive the movable plug-in conductor 4 to reciprocate, and the GIL simulation shell 1 is grounded, and the DC voltage source is connected through the auxiliary basin insulator 51 and the auxiliary conductor 52, and a positive polarity voltage is applied to the movable plug-in conductor 4, and the voltage value is gradually increased to the target voltage. During the test, the partial discharge test system is connected to monitor whether there is a partial discharge signal during the test, and the change of the partial discharge value over time is recorded until the movable plug-in conductor 4 performs a preset number of reciprocating linear motions, then the voltage loading is stopped, the auxiliary conductor 52 is grounded using a grounding rod, and the push-pull drive 71 is stopped. Among them, the preset number of times can be determined according to the actual situation, and the frequency of the reciprocating linear motion of the movable plug-in conductor 4 can also be determined according to the actual situation. In this embodiment, the preset number of times can be 15,000 times, and the operating frequency can be set to 30 times / hour.

[0039] Step S3: After the high-voltage connection component is grounded for a preset time period, a negative polarity test is performed again to drive the movable pluggable conductor to perform reciprocating linear motion, and a negative polarity voltage is applied to the movable pluggable conductor through the high-voltage connection component, and the voltage is increased to the target voltage by a step-by-step voltage boosting method; monitor whether there is a partial discharge signal during the test, and record the change of the partial discharge value over time until the movable pluggable conductor performs a preset number of reciprocating linear motions and stops.

[0040] Specifically, after stopping the push-pull drive 71 for a preset time period, restart the test and conduct a negative polarity test. The push-pull drive 71 can be started first, and a negative polarity voltage is applied to the movable plug-in conductor 4. The voltage is increased to the target voltage by a step-by-step voltage step-up method. The target voltage value is the operating voltage value of the high-voltage DC GIL. During the test, monitor whether there is a partial discharge discharge signal and record the change of the partial discharge value over time. Among them, the preset time period can be determined according to the actual situation. In this embodiment, 30 minutes is used as an example for explanation. Among them, the preset number of times can be determined according to the actual situation, and the frequency of the reciprocating linear motion of the movable plug-in conductor 4 can also be determined according to the actual situation. In this embodiment, the preset number of times can be 15,000 times, and the operating frequency can be set to 30 times / hour.

[0041] Step S4, evaluating the internal insulation performance of the high voltage DC GIL by examining whether there is a partial discharge signal in the test device and the change of the partial discharge value over time during the positive polarity voltage test and the negative polarity voltage test.

[0042] Specifically, the internal insulation performance of the high-voltage DC GIL can be evaluated based on the data obtained during the positive polarity voltage test and the negative polarity voltage test in step S2 and step S3, that is, whether there is a partial discharge signal and the change of the partial discharge value over time, so as to evaluate the impact of foreign matter generated by friction on the insulation performance of the high-voltage DC GIL.

[0043] See also Figure 3 , which is another flowchart of the high-voltage DC GIL internal insulation performance assessment test method provided by the embodiment of the present invention. As shown in the figure, the test method may also include the following steps: Step S1, pre-cleaning the internal insulation performance assessment test device of the high voltage direct current GIL.

[0044] Step S5, determining the maximum deformation of the length of the HVDC GIL basic unit due to thermal expansion and contraction based on the length of the HVDC GIL current-carrying conductor, the thermal expansion coefficient of the HVDC GIL current-carrying conductor and the allowable temperature difference of the HVDC GIL.

[0045] Specifically, based on the length of the current-carrying conductor of the high-voltage direct current GIL, the thermal expansion coefficient of the current-carrying conductor of the high-voltage direct current GIL, and the temperature difference allowed by the high-voltage direct current GIL, the maximum deformation of the basic unit length of the high-voltage direct current GIL due to thermal expansion and contraction is calculated and determined. The maximum deformation of the basic unit length of the high-voltage direct current GIL due to thermal expansion and contraction is calculated using the following formula: δ m = L × k × T; Among them, δ mis the maximum deformation of the basic unit length of the high-voltage DC GIL due to thermal expansion and contraction, L is the length of the current-carrying conductor of the high-voltage DC GIL, k is the thermal expansion coefficient of the current-carrying conductor of the high-voltage DC GIL, and T is the allowable temperature difference of the high-voltage DC GIL.

[0046] Step S6, determining a single movement stroke of the movable pluggable conductor reciprocating linear motion based on the maximum deformation of the length of the high-voltage DC GIL basic unit due to thermal expansion and contraction, and driving the movable pluggable conductor based on the single movement stroke of the movable pluggable conductor reciprocating linear motion.

[0047] Specifically, based on the maximum deformation of the length of the high-voltage DC GIL basic unit due to thermal expansion and contraction determined in step S5, the single movement stroke of the reciprocating linear motion of the movable pluggable conductor is determined. In this embodiment, the single movement stroke of the reciprocating linear motion of the movable pluggable conductor can be 80 mm. The push-pull drive member 71 can be set in advance, and its single movement stroke is set to 80 mm, the number of cycles of the push-pull drive member 71 is set to 15,000 times, and the operating frequency is set to 30 times / hour, so that in steps S2 and S3, the push-pull drive member 71 is started, and the movable pluggable conductor 4 is driven by the push-pull drive member 71 according to the set parameters.

[0048] In this embodiment, there is no sequence between step S1 and step S5.

[0049] Step S2, after the cleaning is completed, the movable pluggable conductor is driven to reciprocate linear motion, and a positive polarity voltage is applied to the movable pluggable conductor through the high-voltage connection assembly, and the voltage is increased to the target voltage by a step-by-step voltage step-up method; and during the test, it is monitored to assess whether there is a partial discharge signal in the test device, and the change of the partial discharge value over time is recorded until the movable pluggable conductor performs a preset number of reciprocating linear motions, then the application of voltage to the movable pluggable conductor and the driving of the reciprocating linear motion of the movable pluggable conductor are stopped, and the high-voltage connection assembly is grounded; wherein, the target voltage is the operating voltage value of the high-voltage DC GIL.

[0050] Step S3: After the high-voltage connection component is grounded for a preset time period, a negative polarity test is performed again to drive the movable pluggable conductor to perform reciprocating linear motion, and a negative polarity voltage is applied to the movable pluggable conductor through the high-voltage connection component, and the voltage is increased to the target voltage by a step-by-step voltage boosting method; monitor whether there is a partial discharge signal during the test, and record the change of the partial discharge value over time until the movable pluggable conductor performs a preset number of reciprocating linear motions and stops.

[0051] Step S4, evaluating the internal insulation performance of the high voltage DC GIL by examining whether there is a partial discharge signal in the test device and the change of the partial discharge value over time during the positive polarity voltage test and the negative polarity voltage test.

[0052] In summary, the high-voltage DC GIL internal insulation performance assessment test method provided in this embodiment can perform positive polarity tests and negative polarity tests on the above-mentioned assessment test device in sequence, and drive the movable plug-in conductor 4 to perform reciprocating linear motion during the test. The influence of foreign matter generated by contact wear on the internal insulation performance of the high-voltage DC GIL can be assessed by assessing whether there is a partial discharge signal in the test device and the change of the partial discharge value over time, thereby achieving the purpose of verifying the long-term operating performance of the internal structure of the high-voltage DC GIL.

[0053] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0054] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A high voltage DC GIL internal insulation performance assessment test device, characterized in that: include: GIL simulates the shell; A first test pot insulator and a second test pot insulator are arranged side by side and at intervals inside the GIL simulation shell along the axial direction of the GIL simulation shell, and a closed test space is formed between the first test pot insulator and the second test pot insulator inside the GIL simulation shell, and plug-in contact seats are provided on opposite sides of the first test pot insulator and the second test pot insulator; A movable pluggable conductor is arranged between a first test pot-type insulator and a second test pot-type insulator along the axial direction of the GIL simulation housing, and both ends of the movable pluggable conductor are provided with contact connectors adapted to the pluggable contact seat, the contact connectors are plugged into the corresponding pluggable contact seat, and the movable pluggable conductor can move along the axial direction of the GIL simulation housing, and is used to drive the contact connector to move back and forth linearly, so that friction is generated between the contact connector and the pluggable contact seat, so as to simulate the friction of the contact plugging structure inside the high-voltage DC GIL; A high-voltage connection assembly is connected to the first test pot-type insulator, and each of the test pot-type insulators is electrically connected to the movable pluggable conductor. The high-voltage connection assembly is used to connect the high-voltage line to introduce high voltage to the movable pluggable conductor, thereby evaluating the influence of foreign matter generated by contact friction on the internal insulation performance of the high-voltage DC GIL.

2. The high voltage DC GIL internal insulation performance assessment test device according to claim 1 is characterized in that: The movable pluggable conductor is connected to a push-pull operating mechanism, which is connected to the movable pluggable conductor and is used to drive the movable pluggable conductor to perform reciprocating linear motion.

3. The high voltage DC GIL internal insulation performance assessment test device according to claim 2 is characterized in that: The push-pull operating mechanism comprises: A push-pull driving member, arranged outside the GIL simulation housing; The transmission assembly has two ends respectively connected to the power output end of the push-pull drive member and the movable pluggable conductor, and is used to drive the movable pluggable conductor to perform reciprocating linear motion under the drive of the push-pull drive member, so as to generate friction between the pluggable contact seat and the contact connector at both ends of the movable pluggable conductor.

4. The high voltage DC GIL internal insulation performance assessment test device according to claim 3 is characterized in that: The transmission assembly comprises: A first transmission member is arranged outside the GIL simulation housing, and one end of the first transmission member is connected to the power output end of the push-pull driving member; The second transmission member is inserted into the GIL simulation shell along the axial direction of the GIL simulation shell in a manner capable of linear motion, and the end of the second transmission member located outside the GIL simulation shell is connected to the other end of the first transmission member, and the end of the second transmission member located inside the GIL simulation shell is connected to the movable pluggable conductor.

5. The high voltage DC GIL internal insulation performance assessment test device according to claim 4 is characterized in that: The second transmission member is an insulating member, and the second transmission member is connected to the end of the GIL simulation housing via a sliding sealing structure.

6. The high voltage DC GIL internal insulation performance assessment test device according to any one of claims 1 to 5, characterized in that: The high voltage connection assembly comprises: Auxiliary pot-type insulator, the side of the GIL simulation shell is provided with a high-voltage introduction port on one side of the enclosed test space, the auxiliary pot-type insulator is arranged at the high-voltage introduction port, and is used to seal the high-voltage introduction port, and the conductor part of the auxiliary pot-type insulator is used to connect the high-voltage connection line placed outside the GIL simulation shell to introduce high voltage; The auxiliary conductor has two ends connected to the conductor part of the auxiliary pot-type insulator and the first test pot-type insulator respectively, and is used to conduct the high voltage introduced by the high-voltage connecting line to the first test pot-type insulator.

7. The high voltage DC GIL internal insulation performance assessment test device according to any one of claims 1 to 5, characterized in that: The GIL simulation shell is arranged with openings at both ends, the second test pot insulator is arranged at one opening of the GIL simulation shell, and a sealing plate is arranged at the other opening of the GIL simulation shell, and the second test pot insulator and the sealing plate are used to seal the GIL simulation shell at both ends axially; The first test pot-type insulator and the second test pot-type insulator are arranged in the same direction; The high-voltage connection assembly and the first test pot-type insulator are sequentially arranged between the sealing plate and the second test pot-type insulator along the axial direction of the GIL simulation housing.

8. A method for evaluating the internal insulation performance of a high voltage DC GIL, characterized in that: The internal insulation performance test device of the high-voltage direct current GIL according to any one of claims 1 to 7 is used for the test, and the test method comprises the following steps: Cleaning the internal insulation performance assessment test device of the high-voltage direct current GIL in advance; After the cleaning is completed, the movable pluggable conductor is driven to reciprocate linear motion, and a positive polarity voltage is applied to the movable pluggable conductor through the high-voltage connection assembly, and the voltage is increased to the target voltage by a step-by-step voltage step-up method; and during the test, whether there is a partial discharge signal in the assessment test device is monitored, and the change of the partial discharge value over time is recorded until the movable pluggable conductor performs a preset number of reciprocating linear motions, then the application of voltage to the movable pluggable conductor and the driving of the reciprocating linear motion of the movable pluggable conductor are stopped, and the high-voltage connection assembly is grounded; wherein, the target voltage is the operating voltage value of the high-voltage DC GIL; After the high-voltage connection assembly is grounded for a preset period of time, a negative polarity test is performed again, the movable pluggable conductor is driven to perform reciprocating linear motion, and a negative polarity voltage is applied to the movable pluggable conductor through the high-voltage connection assembly, and the voltage is increased to the target voltage by a step-by-step voltage step-up method; whether there is a partial discharge signal during the test process is monitored, and the change of the partial discharge value over time is recorded until the movable pluggable conductor stops after performing a preset number of reciprocating linear motions; The internal insulation performance of the high voltage DC GIL is evaluated according to whether there is a partial discharge signal in the assessment test device during the positive polarity voltage test and the negative polarity voltage test and the change of the partial discharge value over time.

9. The high voltage DC GIL internal insulation performance assessment test method according to claim 8, characterized in that: Before driving the movable pluggable conductor to perform reciprocating linear motion, the method further includes the following steps: Determine the maximum deformation of the length of the HVDC GIL basic unit due to thermal expansion and contraction based on the length of the current-carrying conductor of the HVDC GIL, the thermal expansion coefficient of the current-carrying conductor of the HVDC GIL, and the allowable temperature difference of the HVDC GIL; Based on the maximum deformation of the length of the high-voltage DC GIL basic unit due to thermal expansion and contraction, a single movement stroke of the movable pluggable conductor reciprocating linear motion is determined, so as to drive the movable pluggable conductor based on the single movement stroke of the movable pluggable conductor reciprocating linear motion.

10. The high voltage DC GIL internal insulation performance assessment test method according to claim 9, characterized in that: The maximum deformation of the HVDC GIL basic unit length due to thermal expansion and contraction is calculated using the following formula: d m =L×k×T; Among them, δ m is the maximum deformation of the basic unit length of the high-voltage DC GIL due to thermal expansion and contraction, L is the length of the current-carrying conductor of the high-voltage DC GIL, k is the thermal expansion coefficient of the current-carrying conductor of the high-voltage DC GIL, and T is the allowable temperature difference of the high-voltage DC GIL.

Images