Sleeve insulation defect testing device

Abstract

The invention discloses a sleeve insulation defect test device, which relates to the technical field of electric power, and comprises a test cavity, an upper electrode, a lower electrode, a test pressurization platform, an oil gas detection mechanism, an insulation sample, a terminal and a collection mechanism, one end of the test pressurization platform penetrates through the top of the test cavity and is connected with the upper electrode, the other end of the test pressurization platform penetrates through the bottom of the test cavity and is connected with the lower electrode, and a clamping gap for clamping an insulation sample is formed between the upper electrode and the lower electrode; an oil-gas separation membrane is arranged between the oil-gas detection mechanism and the test cavity, the collection mechanism is fixedly installed in the test cavity, and the terminal is electrically connected with the collection mechanism, the oil-gas detection mechanism and the test pressurization platform. The technical problems that an existing sleeve defect simulation test lacks research on various parameter change rules, and the on-line monitoring effect of a sleeve fault is reduced are solved.

Description

Technical Field

[0001] The invention relates to the technical field of electric power, and in particular to a bushing insulation defect testing device. Background Art

[0002] As a key channel for transformer and reactor output, bushing has the characteristics of large lead current and high voltage. Its safe operation is crucial to the stability of the power grid system. Bushing is one of the components with the highest defects or failures in transformers. Studies have shown that bushing failures cause about 25% of the total unplanned outages of 220kV and 500kV transformers, and the unplanned outage time accounts for 56.5% of the total unplanned outage time. In order to understand the insulation characteristics of oil-paper insulation bushings, it is necessary to simulate the defect process of transformer bushings, study its fault development process, and propose fault monitoring methods to detect its internal defects and faults as early as possible.

[0003] At present, the existing casing defect simulation test mainly analyzes the casing fault by collecting the changing laws of the pressure and temperature inside the casing under different defect types. There is a lack of research on the changing laws of parameters such as trace water, hydrogen and acetylene, which reduces the online monitoring effect of casing faults. Summary of the invention

[0004] The present invention provides a bushing insulation defect test device, which solves the technical problem that the existing bushing defect simulation test mainly analyzes the bushing fault by collecting the changing laws of the pressure and temperature in the bushing under different defect types, lacks the research on the changing laws of parameters such as trace water, hydrogen and acetylene, and reduces the online monitoring effect of the bushing fault.

[0005] The present invention provides a bushing insulation defect test device, comprising a test cavity, an upper electrode, a lower electrode, a test pressurization platform, an oil and gas detection mechanism, an insulation sample, a terminal and a collection mechanism;

[0006] The upper electrode and the lower electrode are fixedly installed inside the test cavity, one end of the test pressurization platform passes through the top of the test cavity and is connected to the upper electrode, and an insulating medium is provided in the test cavity;

[0007] The other end of the test pressurizing platform passes through the bottom of the test cavity and is connected to the lower electrode, and a clamping gap for clamping the insulating sample is formed between the upper electrode and the lower electrode;

[0008] The oil and gas detection mechanism is in communication with the side wall of the test cavity, and an oil and gas separation membrane is provided between the oil and gas detection mechanism and the test cavity;

[0009] The collection mechanism is fixedly installed in the test cavity and is used to collect various test parameters in the test cavity;

[0010] The terminal is electrically connected to the acquisition mechanism, the oil and gas detection mechanism and the test pressurization platform respectively. The terminal is used to respond to the casing insulation defect test request and control the test pressurization platform, the oil and gas detection mechanism and the acquisition mechanism to perform the insulation defect test.

[0011] Optionally, the oil and gas detection mechanism includes an oil and gas separation cylinder and a gas sensor;

[0012] The side wall of the test cavity is provided with an air hole, and the oil-gas separation cylinder is connected to the air hole through a thread and a gasket;

[0013] The gas sensor is arranged in the oil-gas separation cylinder, and the gas sensor is used to collect hydrogen data and acetylene data in the oil-gas separation cylinder;

[0014] An aviation plug is provided near the rear of the inner wall of the oil-gas separation cylinder, and the aviation plug is electrically connected to the gas sensor and the terminal respectively.

[0015] Optionally, the test chamber includes a tank body, a flange, fixing bolts and a lifting bracket;

[0016] The flange cover is mounted on the top of the tank body, and the fixing bolts are fixedly mounted on the top of the flange;

[0017] The elevated brackets are fixedly installed at the bottom of the tank body at equal intervals along the circumferential direction.

[0018] Optionally, the test pressurization platform includes a test transformer, a protection resistor, a coupling capacitor, a detection impedance, a partial discharge detector, a first guide rod and a second guide rod;

[0019] The first output end of the test transformer is connected to one end of the protection resistor, and the second output end of the test transformer is connected to one end of the coupling capacitor and one end of the detection impedance respectively;

[0020] The other end of the protection resistor is connected to the other end of the coupling capacitor and one end of the first guide rod respectively;

[0021] The other end of the detection impedance is connected to one end of the second guide rod and the partial discharge detector respectively;

[0022] The other end of the first guide rod passes through the fixing bolt and the flange in sequence and is connected to the upper electrode, and the other end of the second guide rod passes through the bottom of the tank and is connected to the lower electrode;

[0023] The partial discharge detector and the test transformer are electrically connected to the terminal.

[0024] Optionally, the terminal includes a response module, a matching module and an analysis module;

[0025] The response module is used to respond to the bushing insulation defect test request, obtain the simulated defect parameters and the material type of the insulation sample, and use the test pressurization platform to perform the insulation defect test on the test cavity;

[0026] The matching module is used to input the simulated defect parameters and the material type into a preset starting discharge list to obtain a corresponding discharge threshold;

[0027] The analysis module is used to obtain the discharge voltage of the clamping gap through the partial discharge detector, and determine whether the discharge voltage is greater than or equal to the discharge threshold;

[0028] If the discharge voltage is greater than or equal to the discharge threshold, the test pressurization platform is controlled to pressurize the test cavity according to a preset pressurization gradient, and the oil and gas detection mechanism and the collection mechanism are controlled to start;

[0029] If the discharge voltage is less than the discharge threshold, the step of determining whether the discharge voltage is greater than or equal to the discharge threshold is adjusted.

[0030] Optionally, the collection mechanism includes a pressure sensing unit, a temperature sensing unit and a micro-water sensing unit;

[0031] The pressure sensing unit and the temperature sensing unit are fixedly installed on the top of the test cavity, and the micro-water sensing unit is fixedly installed on the bottom of the test cavity;

[0032] The terminal is electrically connected to the pressure sensing unit, the temperature sensing unit and the micro-water sensing unit respectively.

[0033] Optionally, a moisture injection element is provided on the flange.

[0034] Optionally, the insulating sample is glue-impregnated paper, oil-impregnated paper, fiberglass or lower porcelain sleeve.

[0035] Optionally, the oil-gas separation membrane is formed by stacking a first permeation layer, a support sheet and a second permeation layer.

[0036] Optionally, the support sheet is a porous stainless steel plate.

[0037] It can be seen from the above technical solutions that the present invention has the following advantages:

[0038] The present invention provides a casing insulation defect test device, wherein the oil and gas detection mechanism is used to collect hydrogen data and acetylene data during the defect test, and the collection mechanism is used to collect temperature, pressure and micro-water data in the test cavity, and the casing fault analysis is performed by collecting multiple parameters during the defect test, thereby improving the online monitoring effect of the casing fault. In addition, the oil and gas detection mechanism is connected to the side wall of the test cavity, and an oil and gas separation membrane is provided between the oil and gas detection mechanism and the test cavity, thereby realizing accurate monitoring of gas data. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0040] Figure 1 A schematic diagram of the overall structure of a bushing insulation defect test device provided by an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of the structure of an oil and gas detection mechanism provided by an embodiment of the present invention;

[0042] Figure 3 A schematic diagram of the structure of a moisture injection element provided by an embodiment of the present invention;

[0043] Figure 4 Schematic diagram of the structure of the insulating sample provided by the embodiment of the present invention Figure 1 ;

[0044] Figure 5 Schematic diagram of the structure of the insulating sample provided by the embodiment of the present invention Figure 2 ;

[0045] Figure 6 A schematic diagram of a clamping gap provided by an embodiment of the present invention;

[0046] Figure 7 A schematic diagram of oil and gas separation provided by an embodiment of the present invention;

[0047] The meanings of the reference numerals are as follows:

[0048] 1. Tank body; 2. First guide rod; 3. Fixing bolt; 4. Flange; 5. Oil and gas detection mechanism; 6. Upper electrode; 7. Lower electrode; 8. Lifting bracket; 9. Pressure sensing unit; 10. Temperature sensing unit; 11. Micro-water sensing unit; 12. Test transformer; 13. Protection resistor; 14. Coupling capacitor; 15. Detection impedance; 16. Partial discharge detector; 17. Oil and gas separation membrane; 18. Oil and gas separation cylinder; 19. Gas sensor; 20. Aerial plug; 21. Water injection element; 22. Insulation sample. DETAILED DESCRIPTION

[0049] The embodiment of the present invention provides a bushing insulation defect test device, which is used to solve the technical problem that the existing bushing defect simulation test mainly analyzes the bushing fault by collecting the change law of the pressure and temperature in the bushing under different defect types, lacks the research on the change law of parameters such as trace water, hydrogen and acetylene, and reduces the online monitoring effect of the bushing fault.

[0050] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] At present, a single detection method or insulation parameter monitoring cannot obtain sufficient defect status information, which is prone to misjudgment of diagnosis and evaluation. Research on casing defect diagnosis and status evaluation methods based on multi-source information can reflect the operating status of the casing as a whole, and can more accurately determine the type of casing defects. Existing studies have shown that in view of the complexity and uncertainty of casing state parameters, non-electrical parameters such as changes in gas in oil, temperature changes, pressure changes, and changes in micro-water in oil are analyzed and processed to extract features reflecting the casing state and defect characteristics. Therefore, technicians in this field are committed to developing an oil-paper casing insulation defect detection platform, and by studying the changes in multiple parameters during the development of typical casing defects, they can achieve simultaneous online measurement of multiple parameters during the development of typical casing defects. However, the existing casing defect monitoring methods are mainly used for offline monitoring of casing defects, and there is a technical bottleneck problem that the defect development status of the casing cannot be monitored in real time and for a long time during operation.

[0052] To this end, the present invention provides a casing defect test device mainly suitable for contact with oil (such as multi-metal guide rod discharge, porcelain insulator surface discharge, etc.), which can realize simultaneous online measurement of multiple parameters during the development process of typical casing defects, and then jointly monitor the operation of the casing based on five characteristic parameters such as pressure, temperature, trace water, hydrogen and acetylene, thereby improving the casing defect monitoring effect and solving the shortcomings of the prior art.

[0053] For easier understanding, see Figure 1-Figure 7 As shown, a bushing insulation defect test device provided by the present invention includes a test chamber, an upper electrode 6, a lower electrode 7, a test pressurization platform, an oil and gas detection mechanism 5, an insulation sample 22, a terminal and a collection mechanism;

[0054] The upper electrode 6 and the lower electrode 7 are fixedly installed inside the test cavity, one end of the test pressurization platform passes through the top of the test cavity and is connected to the upper electrode 6, and an insulating medium is provided in the test cavity;

[0055] The other end of the test pressurizing platform passes through the bottom of the test cavity and is connected to the lower electrode 7, and a clamping gap for clamping the insulating sample 22 is formed between the upper electrode 6 and the lower electrode 7;

[0056] The oil and gas detection mechanism 5 is connected to the side wall of the test cavity, and an oil and gas separation membrane 17 is provided between the oil and gas detection mechanism 5 and the test cavity;

[0057] The collection mechanism is fixedly installed in the test chamber and is used to collect various test parameters in the test chamber;

[0058] The terminal is electrically connected to the acquisition mechanism, the oil and gas detection mechanism 5 and the test pressurization platform respectively. The terminal is used to respond to the casing insulation defect test request and control the test pressurization platform, the oil and gas detection mechanism 5 and the acquisition mechanism to perform the insulation defect test.

[0059] In an embodiment of the present invention, when the casing insulation defect test type and the insulation sample 22 type are received, the casing insulation defect test type and the insulation sample 22 type are input into a preset pressurization database through the terminal, and the corresponding pressurization threshold is matched. The upper electrode 6 and the lower electrode 7 are pressurized by controlling the test pressurization platform through the terminal, and the real-time discharge voltage is obtained through the test pressurization platform. When the discharge voltage is greater than or equal to the pressurization threshold, the discharge voltage at this time is used as the partial discharge starting voltage, and the test pressurization platform is pressurized with a fixed pressurization step length through the terminal control. The continuous withstand voltage time at each voltage level is 30 minutes until breakdown. At the same time, when pressurizing with a fixed pressurization step length, the pressure data, temperature data and micro-water data in the test cavity during the defect development process are collected through the collection mechanism, and the hydrogen data and acetylene data in the test cavity during the defect development process are collected through the oil and gas detection mechanism 5.

[0060] In another embodiment, see Figure 6 As shown, 1. For the discharge along the outer insulation surface, the clamping gap between the upper electrode 6 and the lower electrode 7 does not need to be clamped for insulation testing. The clamping gap is adjusted to 5mm, and the pressure is applied at a boost speed of 1kV / min through the terminal control test pressure platform. At the same time, a partial discharge detector is used for detection. When the discharge voltage is greater than or equal to 10kV, the terminal controls the test pressure platform to pressurize at a fixed pressure step length. The continuous withstand voltage time at each voltage level is 30min until it breaks down at about 30kV. 2. For the discharge defects in the gaps of multi-metal conduits, the clamping gap is adjusted to 1mm, and the pressure is applied at a boost speed of 1kV / min through the terminal control test pressure platform. At the same time, a partial discharge detector is used for detection. When the discharge voltage is greater than or equal to 10kV, the terminal controls the test pressure platform to simulate the state in which the metal tube gap is reduced to a field strength greater than the discharge start during operation, and the tube gap begins to discharge.

[0061] It should be noted that the insulating medium may be insulating oil, sulfur hexafluoride gas or nitrogen gas, etc.

[0062] See also Figure 1 , Figure 2 and Figure 7 As shown, the oil and gas detection mechanism 5 includes an oil and gas separation cylinder 18 and a gas sensor 19; an air hole is provided on the side wall of the test chamber, and the oil and gas separation cylinder 18 is connected to the air hole through a thread and a gasket; a gas sensor 19 is provided in the oil and gas separation cylinder 18, and the gas sensor 19 is used to collect hydrogen data and acetylene data in the oil and gas separation cylinder 18; an air plug 20 is provided on the inner wall of the oil and gas separation cylinder 18 near the rear position, and the air plug 20 is electrically connected to the gas sensor 19 and the terminal respectively.

[0063] In an embodiment of the present invention, the oil and gas detection mechanism 5 includes an oil and gas separation cylinder 18 and a gas sensor 19. A protruding air hole (the diameter of the air hole is 80 mm) is opened on the side wall surface of the test cavity, and the oil and gas separation cylinder 18 is screwed and sealed at the rear of the hole by a threaded gasket, so that the oil and gas separation cylinder 18 is connected to the inside of the test cavity. A gas sensor 19 is provided in the oil and gas separation cylinder 18, and the gas sensor 19 is an integrated sensor of hydrogen and acetylene, which is used to collect hydrogen data and acetylene data in the oil and gas separation cylinder 18. The aviation plug 20 arranged on the inner wall of the oil and gas separation cylinder 18 near the rear position is electrically connected to the gas sensor 19 and the terminal respectively. It can ensure the stability and reliability of data transmission. Reduce the impact of electromagnetic interference on data transmission, so that the terminal device can receive accurate detection data in time for subsequent analysis and decision-making.

[0064] It is worth mentioning that a carbon monoxide sensor is also provided in the oil-gas separation cylinder 18, which can comprehensively monitor the status of oil and gas by collecting a variety of gas data.

[0065] See also Figure 1 As shown, the test chamber includes a tank body 1, a flange 4, fixing bolts 3 and an elevated bracket 8; the flange 4 is covered on the top of the tank body 1, and the fixing bolts 3 are fixedly installed on the top of the flange 4; the elevated bracket 8 is fixedly installed on the bottom of the tank body 1 at equal intervals along the circumferential direction.

[0066] In an embodiment of the present invention, the test chamber includes a tank body 1, a flange 4, a fixing bolt 3 and a lifting bracket 8, wherein the flange 4 is removably covered and mounted on the top of the tank body 1, and a test chamber is formed between the flange 4 and the tank body 1. The fixing bolt 3 is fixedly mounted on the top of the flange 4. The lifting bracket 8 is fixedly mounted on the bottom of the tank body 1 at equal intervals along the circumferential direction. In some special test environments, such as when the ground is uneven or the tank body 1 needs to be placed at a specific height for easy operation and observation, the lifting bracket 8 can ensure that the tank body 1 is in a horizontal and stable state. For example, in an outdoor oil and gas test site, the ground may have a certain slope, and the lifting bracket 8 can adjust the levelness of the tank body 1 to ensure the accuracy of the test. And the lifting bracket 8 raises the tank body 1 so that there is a certain space between the bottom of the tank body 1 and the ground. This space can be used to arrange various pipelines, lines or other auxiliary equipment.

[0067] See also Figure 1 As shown, the test pressurization platform includes a test transformer 12, a protective resistor 13, a coupling capacitor 14, a detection impedance 15, a partial discharge detector 16, a first guide rod 2 and a second guide rod; the first output end of the test transformer 12 is connected to one end of the protective resistor 13, and the second output end of the test transformer 12 is respectively connected to one end of the coupling capacitor 14 and one end of the detection impedance 15; the other end of the protective resistor 13 is respectively connected to the other end of the coupling capacitor 14 and one end of the first guide rod 2; the other end of the detection impedance 15 is respectively connected to one end of the second guide rod and the partial discharge detector 16; the other end of the first guide rod 2 passes through the fixing bolt 3 and the flange 4 in sequence and is connected to the upper electrode 6, and the other end of the second guide rod passes through the bottom of the tank body 1 and is connected to the lower electrode 7; the partial discharge detector 16 and the test transformer 12 are electrically connected to the terminal.

[0068] In an embodiment of the present invention, the test pressurization platform includes a test transformer 12 (the test transformer 12 can be a 150kv transformer), a protective resistor 13, a coupling capacitor 14, a detection impedance 15, a partial discharge detector 16, a first guide rod 2 and a second guide rod. The first output end of the test transformer 12 is connected to one end of the protective resistor 13, and the second output end of the test transformer 12 is respectively connected to one end of the coupling capacitor 14 and one end of the detection impedance 15. During the defect test, if the current increases sharply due to some unexpected factors (such as a sudden short circuit between electrodes), the protective resistor 13 can limit the current to prevent excessive current from damaging the test transformer 12 and other circuit components. The other end of the protective resistor 13 is respectively connected to the other end of the coupling capacitor 14 and one end of the first guide rod 2. During the defect test, the coupling capacitor 14 can effectively couple the AC signal output by the test transformer 12 to the subsequent circuit, while preventing the transmission of the DC component, ensuring the purity of the signal in the circuit, and helping to improve the accuracy of partial discharge detection. The other end of the detection impedance 15 is respectively connected to one end of the second guide rod and the partial discharge detector 16. The other end of the first guide rod 2 is mounted on the flange 4 by means of screws and fixing bolts 3, and is connected to the upper electrode 6, and the other end of the second guide rod passes through the bottom of the tank 1 and is connected to the lower electrode 7. The upper electrode 6 and the lower electrode 7 can be reasonably arranged in the test chamber, which is convenient for forming a uniform electric field distribution in the test chamber, thereby improving the reliability of the test results.

[0069] It should be noted that the connection between the first guide rod 2, the second guide rod and the tank body 1 is sealed by adding a sealing rubber ring.

[0070] It should be noted that the terminal includes a response module, a matching module and an analysis module; the response module is used to respond to the bushing insulation defect test request, obtain the simulated defect parameters and the material type of the insulation sample 22, and use the test pressurization platform to perform an insulation defect test on the test cavity; the matching module is used to input the simulated defect parameters and the material type into a preset starting discharge list to obtain a corresponding discharge threshold; the analysis module is used to obtain the discharge voltage of the clamping gap through the local discharge detector 16, and determine whether the discharge voltage is greater than or equal to the discharge threshold; if the discharge voltage is greater than or equal to the discharge threshold, the test pressurization platform is controlled to pressurize the test cavity according to a preset pressurization gradient, and the oil and gas detection mechanism 5 and the acquisition mechanism are controlled to start; if the discharge voltage is less than the discharge threshold, the step of determining whether the discharge voltage is greater than or equal to the discharge threshold is adjusted.

[0071] In an embodiment of the present invention, the terminal includes a response module, a matching module and an analysis module. The response module is used to respond to the bushing insulation defect test request, obtain the simulated defect parameters and the material type of the insulation sample 22, and control the test pressurization platform to perform an insulation defect test on the test cavity at a boost speed of 1 kV / min. The matching module is used to input the simulated defect parameters and the material type into a preset starting discharge list to match the corresponding discharge threshold. The analysis module is used to perform partial discharge detection through a partial discharge detector 16, obtain the discharge voltage of the clamping gap, and determine whether the discharge voltage is greater than or equal to the discharge threshold. If the discharge voltage is greater than or equal to the discharge threshold, it means that a relatively stable discharge occurs in the test cavity. This is used as the initial discharge voltage to control the test pressurization platform to pressurize the test cavity according to the preset pressurization gradient, and control the oil and gas detection mechanism 5 and the acquisition mechanism to start. If the discharge voltage is less than the discharge threshold, the step of determining whether the discharge voltage is greater than or equal to the discharge threshold is adjusted.

[0072] See also Figure 1 As shown, the collection mechanism includes a pressure sensing unit 9, a temperature sensing unit 10 and a micro-water sensing unit 11;

[0073] The pressure sensing unit 9 and the temperature sensing unit 10 are fixedly installed on the top of the test chamber, and the micro-water sensing unit 11 is fixedly installed on the bottom of the test chamber; the terminal is electrically connected to the pressure sensing unit 9, the temperature sensing unit 10 and the micro-water sensing unit 11 respectively.

[0074] In the embodiment of the present invention, the collection mechanism includes a pressure sensing unit 9, a temperature sensing unit 10 and a micro-water sensing unit 11. The pressure sensing unit 9 and the temperature sensing unit 10 are fixedly installed on both sides of the flange 4. The pressure sensing unit 9 is used to collect pressure data in the test cavity. The temperature sensing unit 10 is used to collect temperature data in the test cavity. The micro-water sensing unit 11 is fixedly installed at the bottom of the test cavity to collect micro-water data in the test cavity. The terminal is electrically connected to the pressure sensing unit 9, the temperature sensing unit 10 and the micro-water sensing unit 11 respectively.

[0075] See also Figure 3 As shown, a moisture injection element 21 is provided on the flange 4 .

[0076] In the embodiment of the present invention, a moisture injection element 21 is provided on the flange 4. By injecting moisture through the moisture injection element 21, moisture defects inside the bushing, moisture defects along the surface of the external insulation, moisture defects in the gaps of the multi-metal conduits, and moisture defects along the surface of the capacitor core can be simulated, so as to obtain more information on the bushing defect status.

[0077] See also Figure 4-5 As shown, the insulating sample 22 is made of glue-impregnated paper, oil-impregnated paper, fiberglass or lower porcelain sleeve.

[0078] In the embodiment of the present invention, the insulating sample 22 is glue-impregnated paper, oil-impregnated paper, fiberglass or lower porcelain sleeve. When the insulating sample 22 is glue-impregnated paper, the selected dimensions are 20 mm in diameter and 30 mm in height. When the insulating sample 22 is a lower porcelain sleeve, the selected dimensions are 80 mm in outer diameter, 50 mm in inner diameter and 20 mm in height.

[0079] It is worth mentioning that the size of the upper electrode 6 and the lower electrode 7 can be set by simulation calculation according to the size of the insulating sample 22. Generally, the size of the upper electrode 6 and the lower electrode 7 is selected to be 30 mm in diameter and 4 mm in chamfer. The clamping gap is 20 mm-50 mm.

[0080] It should be noted that the oil-gas separation membrane 17 is formed by stacking a first permeable layer, a support sheet and a second permeable layer.

[0081] In the embodiment of the present invention, the oil-gas separation membrane 17 is stacked by a first permeable layer, a support sheet and a second permeable layer. The first permeable layer and the second permeable layer are made of modified polytetrafluoroethylene (PTFE), which has a good permeability coefficient for the six common decomposition products of transformer oil. When the membrane thickness is 1.8×10-4m, the permeability coefficients of hydrogen and acetylene H / (10-17m2 / s·Pa) are 6.5 and 0.2 respectively. In addition, PTFE has excellent chemical stability and thermal stability, and has certain hydrophobicity, and can achieve rapid separation of oil and gas in 2-3min. By adding a support sheet in the first permeable layer and the second permeable layer, it is ensured that the oil-gas separation membrane 17 can withstand a certain oil pressure.

[0082] It is worth mentioning that by arranging the oil-gas separation membrane 17 at the channel connecting the oil-gas detection mechanism 5 and the test chamber, gases such as hydrogen and acetylene produced by the transformer oil during the test can enter the oil-gas detection mechanism 5 through the filtering effect of the oil-gas separation membrane 17, thereby monitoring the concentration of hydrogen and acetylene gases in the oil-gas detection mechanism 5 through the gas sensor 19.

[0083] It should be noted that the support sheet is a porous stainless steel plate.

[0084] In the embodiment of the present invention, the support sheet is made of porous stainless steel plate. During the use of the oil-gas separation membrane 17, the porous structure provides a good channel for oil-gas separation. On the one hand, the porous structure allows the oil and gas molecules to have enough diffusion space in the membrane, so that the oil and gas molecules can smoothly contact the permeation layer and carry out the separation process. On the other hand, the porous structure can regulate the flow state of the oil and gas in the membrane to a certain extent, avoiding local blockage or uneven flow. The efficiency of oil-gas separation is improved.

[0085] In the embodiment of the present invention, the present invention provides a casing insulation defect test device, wherein the oil and gas detection mechanism is used to collect hydrogen data and acetylene data during the defect test, and the collection mechanism is used to collect temperature, pressure and micro-water data in the test cavity, and the casing fault analysis is performed by collecting multiple parameters during the defect test, thereby improving the online monitoring effect of the casing fault. In addition, the oil and gas detection mechanism is connected to the side wall of the test cavity, and an oil and gas separation membrane is provided between the oil and gas detection mechanism and the test cavity, thereby realizing accurate monitoring of gas data.

[0086] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0087] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0088] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bushing insulation defect test device, characterized in that: It includes a test chamber, an upper electrode, a lower electrode, a test pressurization platform, an oil and gas detection mechanism, an insulating sample, a terminal and a collection mechanism; The upper electrode and the lower electrode are fixedly installed inside the test cavity, one end of the test pressurization platform passes through the top of the test cavity and is connected to the upper electrode, and an insulating medium is provided in the test cavity; The other end of the test pressurizing platform passes through the bottom of the test cavity and is connected to the lower electrode, and a clamping gap for clamping the insulating sample is formed between the upper electrode and the lower electrode; The oil and gas detection mechanism is in communication with the side wall of the test cavity, and an oil and gas separation membrane is provided between the oil and gas detection mechanism and the test cavity; The collection mechanism is fixedly installed in the test cavity and is used to collect various test parameters in the test cavity; The terminal is electrically connected to the acquisition mechanism, the oil and gas detection mechanism and the test pressurization platform respectively. The terminal is used to respond to the casing insulation defect test request and control the test pressurization platform, the oil and gas detection mechanism and the acquisition mechanism to perform the insulation defect test.

2. The bushing insulation defect test device according to claim 1, characterized in that: The oil and gas detection mechanism includes an oil and gas separation cylinder and a gas sensor; The side wall of the test cavity is provided with an air hole, and the oil-gas separation cylinder is connected to the air hole through a thread and a gasket; The gas sensor is arranged in the oil-gas separation cylinder, and the gas sensor is used to collect hydrogen data and acetylene data in the oil-gas separation cylinder; An aviation plug is provided near the rear of the inner wall of the oil-gas separation cylinder, and the aviation plug is electrically connected to the gas sensor and the terminal respectively.

3. The bushing insulation defect test device according to claim 1, characterized in that: The test chamber includes a tank body, a flange, fixing bolts and a lifting bracket; The flange cover is mounted on the top of the tank body, and the fixing bolts are fixedly mounted on the top of the flange; The elevated brackets are fixedly installed at the bottom of the tank body at equal intervals along the circumferential direction.

4. The bushing insulation defect test device according to claim 3, characterized in that: The test pressurization platform includes a test transformer, a protection resistor, a coupling capacitor, a detection impedance, a partial discharge detector, a first guide rod and a second guide rod; The first output end of the test transformer is connected to one end of the protection resistor, and the second output end of the test transformer is connected to one end of the coupling capacitor and one end of the detection impedance respectively; The other end of the protection resistor is connected to the other end of the coupling capacitor and one end of the first guide rod respectively; The other end of the detection impedance is connected to one end of the second guide rod and the partial discharge detector respectively; The other end of the first guide rod passes through the fixing bolt and the flange in sequence and is connected to the upper electrode, and the other end of the second guide rod passes through the bottom of the tank and is connected to the lower electrode; The partial discharge detector and the test transformer are electrically connected to the terminal.

5. The bushing insulation defect test device according to claim 4, characterized in that: The terminal includes a response module, a matching module and an analysis module; The response module is used to respond to the bushing insulation defect test request, obtain the simulated defect parameters and the material type of the insulation sample, and use the test pressurization platform to perform the insulation defect test on the test cavity; The matching module is used to input the simulated defect parameters and the material type into a preset starting discharge list to obtain a corresponding discharge threshold; The analysis module is used to obtain the discharge voltage of the clamping gap through the partial discharge detector, and determine whether the discharge voltage is greater than or equal to the discharge threshold; If the discharge voltage is greater than or equal to the discharge threshold, the test pressurization platform is controlled to pressurize the test cavity according to a preset pressurization gradient, and the oil and gas detection mechanism and the collection mechanism are controlled to start; If the discharge voltage is less than the discharge threshold, the step of determining whether the discharge voltage is greater than or equal to the discharge threshold is adjusted.

6. The bushing insulation defect test device according to claim 1, characterized in that: The collection mechanism includes a pressure sensing unit, a temperature sensing unit and a micro-water sensing unit; The pressure sensing unit and the temperature sensing unit are fixedly installed on the top of the test cavity, and the micro-water sensing unit is fixedly installed on the bottom of the test cavity; The terminal is electrically connected to the pressure sensing unit, the temperature sensing unit and the micro-water sensing unit respectively.

7. The bushing insulation defect test device according to claim 3, characterized in that: A moisture injection element is provided on the flange.

8. The bushing insulation defect test device according to claim 1, characterized in that: The insulating sample is glue-impregnated paper, oil-impregnated paper, fiberglass or lower porcelain sleeve.

9. The bushing insulation defect test device according to claim 1, characterized in that: The oil-gas separation membrane is formed by stacking a first permeation layer, a support sheet and a second permeation layer.

10. The bushing insulation defect test device according to claim 9, characterized in that: The supporting sheet is a porous stainless steel plate.

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