Test fixture for transformer insulation

Abstract

The present invention provides a test fixture for transformer insulation components, comprising: a first shell having a first chamber, one end of the first shell having a first opening connected to the first chamber; a side wall of the first shell having at least two first interfaces, each of which is connected to the first chamber and extends outward relative to the first chamber; a side wall of the first shell having a second interface, the second interface being connected to the first chamber; a second shell having at least two interfaces connected one-to-one to the first interfaces; the second shell also having a second chamber, the second chamber being connected to the first chamber via the first interface; one end of the second shell having a second opening connected to the second chamber; a first cover; a second cover; a first valve correspondingly provided on the first interface; and a second valve correspondingly provided on the second interface. Using the test fixture of the present invention, insulation component samples corresponding to different vacuuming stages and insulation component samples corresponding to different oiling stages can be obtained.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of transformer production, and in particular to a testing tool for transformer insulation components. Background Art

[0002] Vacuum oil filling is a process that occurs after a transformer is finished. It takes the longest time in the entire transformer manufacturing process. Therefore, those skilled in the art are looking to improve this process to increase transformer production efficiency.

[0003] To support improvements in the vacuum oil filling process (vacuuming can be completed when the insulation's moisture content meets the specified level, and the vacuum oil filling process can be completed when the insulation is completely soaked in oil), technicians in this field need to measure the oil immersion rate and moisture content of transformer insulation. This is particularly true for transformers in ultra-high voltage product lines, which are manufactured in small batches and have a low degree of standardization, and often encounter new specifications. Therefore, frequent measurements of the oil immersion rate and moisture content of new transformer specifications are necessary to improve the vacuum oil filling process for subsequent production of transformers of the same specification.

[0004] The existing test tooling cannot obtain test samples corresponding to different vacuuming stages and test samples corresponding to different oil filling stages, making it difficult for users to obtain regular conclusions through subsequent micro-water content and oil immersion rate measurements. Summary of the Invention

[0005] An embodiment of the present invention provides a testing tool for transformer insulation parts to solve the problem that the existing testing tool cannot obtain test samples corresponding to different vacuuming stages and test samples corresponding to different oil filling stages, making it difficult for users to obtain regularity conclusions through subsequent micro-water content and oil immersion rate measurements.

[0006] In order to solve the above-mentioned technical problems, the present invention is achieved as follows:

[0007] In a first aspect, an embodiment of the present invention provides a test fixture for transformer insulation components, comprising:

[0008] A first housing has a first chamber, one end of the first housing has a first opening communicating with the first chamber; a side wall of the first housing has at least two first interfaces, each of which is communicated with the first chamber and extends outward from the first chamber; a side wall of the first housing has a second interface, the second interface communicating with the first chamber;

[0009] The second housing has at least two parts, and the parts are connected to the first interface in a one-to-one correspondence; the second housing further has a second chamber, the second chamber is connected to the first chamber via the first interface; one end of the second housing has a second opening connected to the second chamber;

[0010] a first cover body, detachably disposed on the first opening;

[0011] a second cover detachably disposed on the second opening;

[0012] a first valve, correspondingly provided on the first interface, for controlling the connection or disconnection between the first interface and the first chamber;

[0013] The second valve is correspondingly provided on the second interface and is used to control the connection or disconnection between the second interface and the first chamber.

[0014] Optionally,

[0015] The first shell is cylindrical; the first interface extends along the radial direction of the first shell, and the first angle between any two adjacent first interfaces is equal;

[0016] The first angle is an angle formed by the extension directions of two adjacent first interfaces relative to the axis of the first shell.

[0017] Optionally,

[0018] Any two of the second interfaces are not spaced apart in the axial direction of the first housing;

[0019] The second interface is spaced apart from the first interface in the axial direction of the first shell.

[0020] Optionally,

[0021] The first interface is in a circular tube shape, and the length direction of the first interface coincides with the radial direction of the first shell.

[0022] Optionally,

[0023] The second shell is cylindrical, the first interface is tubular, and one end of the second shell that does not have the second opening is connected to the first interface via a flange, and the interface of the flange is sealed.

[0024] Optionally,

[0025] The first interface is in the shape of a circular tube, the second interface is in the shape of a circular tube, and the diameter of the second interface is larger than the diameter of the first interface.

[0026] Optionally,

[0027] The first cover body is provided with an exhaust valve.

[0028] Optionally, it also includes:

[0029] The micro-water measuring instrument comprises: a micro-water measuring instrument body and a micro-water measuring probe;

[0030] The micro-water measuring probe is electrically connected to the micro-water measuring instrument body, and the micro-water measuring probe is located in the second chamber.

[0031] Optionally, it also includes:

[0032] The oil immersion measuring instrument comprises: an oil immersion measuring instrument body and an oil immersion measuring probe;

[0033] The oil immersion measuring probe is electrically connected to the oil immersion measuring instrument body, and the oil immersion measuring probe is located in the first chamber.

[0034] Optionally,

[0035] The oil immersion measuring instrument includes at least one of the following types of measuring instruments:

[0036] Vision measuring instrument, laser measuring instrument.

[0037] In an embodiment of the present invention, the test tool includes: a first shell having a first chamber, one end of the first shell having a first opening connected to the first chamber; a side wall of the first shell having at least two first interfaces, each of which is connected to the first chamber and extends outward relative to the first chamber; a side wall of the first shell having a second interface, the second interface is connected to the first chamber; a second shell having at least two, one-to-one corresponding connections to the first interfaces; the second shell also having a second chamber, the second chamber being connected to the first chamber through the first interface; one end of the second shell having a second opening connected to the second chamber; a first cover body, which is detachable The invention discloses a novel test tool for the transformer vacuum oil filling system. The test tool is detachably provided on the first opening; the second cover is detachably provided on the second opening; the first valve is correspondingly provided on the first interface, and is used to control the connection or disconnection between the first interface and the first chamber; the second valve is correspondingly provided on the second interface, and is used to control the connection or disconnection between the second interface and the first chamber. The test tool of the embodiment of the present invention can obtain test samples corresponding to different vacuum pumping stages and test samples corresponding to different oil filling stages, so that the user can obtain regularity conclusions through the subsequent micro-water content and oil immersion rate measurements, laying a solid foundation for improving the transformer vacuum oil filling process based on the regularity conclusions. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0039] Figure 1 1 is a top view of a test fixture according to an embodiment of the present invention, wherein the first opening is not provided with a first cover;

[0040] Figure 2 This is a schematic top view of a test tool according to an embodiment of the present invention, wherein a first cover is provided on the first opening;

[0041] Figure 3 A schematic side view of a test tool according to an embodiment of the present invention;

[0042] Figure 4 This is a front view schematic diagram of the second housing in the test tool according to an embodiment of the present invention;

[0043] Figure 5 For and with Figure 4 A longitudinal cross-sectional diagram of the second housing in the corresponding test tooling according to an embodiment of the present invention;

[0044] Figure 6 Schematic diagram of oil immersion rate measurement;

[0045] Figure 7 This is a schematic diagram of the sample immersion oil measurement results table;

[0046] in,

[0047] 1. First housing; 10. First opening; 11. First chamber; 12. First interface; 13. Second interface;

[0048] 2. Second housing; 21. Second chamber; 22. Second opening;

[0049] 3. First cover; 4. Second cover; 5. First valve; 6. Second valve; 7. Exhaust valve;

[0050] a. The first angle. DETAILED DESCRIPTION

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0052] The embodiment of the present invention provides a test tool for transformer insulation parts, see Figures 1 to 5 As shown, the test fixture includes:

[0053] The first housing 1 has a first chamber 11. One end of the first housing 1 has a first opening 10 communicating with the first chamber 11. The side wall of the first housing 1 has at least two first interfaces 12, each of which communicates with the first chamber 11 and extends outward relative to the first chamber 11. The side wall of the first housing 1 has a second interface 13, which communicates with the first chamber 11.

[0054] The second housing 2 has at least two parts, which are connected to the first interface 12 in a one-to-one correspondence. The second housing 2 also has a second chamber 21, which is connected to the first chamber 11 through the first interface 12. One end of the second housing 2 has a second opening 22 connected to the second chamber 21.

[0055] The first cover 3 is detachably mounted on the first opening 10;

[0056] The second cover 4 is detachably mounted on the second opening 22;

[0057] The first valve 5 is correspondingly provided on the first interface 12 and is used to control the connection or disconnection between the first interface 12 and the first chamber 11;

[0058] The second valve 6 is correspondingly provided on the second interface 13 and is used to control the connection or disconnection between the second interface 13 and the first chamber 11 .

[0059] In some embodiments of the present invention, optionally, there are 6 first interfaces 12 , and correspondingly, there are 6 second shells 2 , and the second shells 2 are connected to the first interfaces 12 one by one, and the second chamber 21 is connected to the first chamber 11 through the first interface 12 .

[0060] In the embodiment of the present invention, the first cover 3 is disposed on the first opening 10 , and the first opening 10 is sealed; the second cover 4 is disposed on the second opening 22 , and the second opening 22 is sealed.

[0061] When testing using the test fixture of the embodiment of the present invention, insulating component samples for oil immersion testing (hereinafter referred to as oil immersion samples) are placed in the first chamber 11, and the first cover 3 is placed on the first opening 10 to seal the first opening 10. Insulating component samples for trace water testing (hereinafter referred to as trace water samples) are placed one-to-one in the second chamber 21, and the second cover 4 is placed on the second opening 22 to seal the second opening 22. The second interface 13 is connected to the oil filling port of the transformer, and the first valve 5 and the second valve 6 are kept open. The transformer oil storage chamber, the first chamber 11, and the second chamber 21 are interconnected.

[0062] Afterwards, the transformer is vacuumed, and the gas in the transformer oil storage chamber, first chamber 11, and second chamber 21 is simultaneously extracted. As the vacuuming operation proceeds, at set intervals, a first valve 5 is closed, the corresponding second cover 4 is opened, and the trace water sample in the second chamber 21 is removed. The trace water content of the trace water sample is measured using a trace water meter, and trace water measurement data is obtained. This process continues until the trace water content of the trace water sample is measured for all set intervals. In this process, test samples (oil-immersed samples) corresponding to different vacuuming stages are obtained, allowing users to draw regularity conclusions through subsequent trace water content measurements.

[0063] When the determination of the trace water content of the trace water sample for all set times is completed, the trace water content determination is completed and the vacuuming operation is ended.

[0064] After the vacuuming operation is completed, the oil immersion rate test is further performed. The oil filling operation of the transformer begins, and the oil injected into the transformer oil storage cavity enters the first chamber 11 through the second interface 13, and the oil immersion sample is immersed in the oil.

[0065] Every time a withdrawal time f (measured in hours h, where f is measured from the start of oil filling) set for the oil immersion rate test is reached, the second valve 6 is closed, the first cover 3 is opened, the oil immersion sample is taken out, the oil immersion distance of the oil immersion sample is measured, and the oil immersion rate is calculated. The oil immersion sample is placed in the first chamber 11 again, the first cover 3 is set at the first opening 10, the second valve 6 is opened, and the oil immersion sample is taken out at the next withdrawal time f to measure the oil immersion rate again. This process is repeated until the oil immersion rate measurement for all withdrawal times f is completed. In the above process, test samples (oil immersion samples) corresponding to different oil extraction and filling stages are obtained, so that the user can obtain regularity conclusions through subsequent penetration rate measurements.

[0066] The oil penetration distance includes the hole penetration distance and the edge penetration distance. Figure 6 As shown, there is a process hole at the center of the oil-immersed sample cross section, and the hole penetration distance is the maximum distance between the oil stain and the process hole obtained by the oil penetrating from the process hole to the periphery. Figure 6 The hole penetration distance of the oil-immersed sample is b, in mm. The edge penetration distance is the average of the oil penetration distances of each edge on the cross section of the oil-immersed sample, where the edge penetration distance is the maximum distance between the oil stain and the corresponding edge obtained by the oil penetrating from each edge of the oil-immersed sample to the center. For example, Figure 6 The edge oil immersion distances of the oil-immersed sample are c1, c2, c3 and c4, then the edge oil immersion distance of the oil-immersed sample k = (c1+c2+c3+c4) / 4, unit: mm.

[0067] It is understandable that there are two types of oil penetration rates, namely, hole penetration rate and edge penetration rate. Users can determine which penetration rate to adopt as test data according to their own needs, or users can use both penetration rates as test data. The hole penetration rate is the hole penetration distance divided by the test time. For example, Figure 6 The pore penetration rate of the oil-immersed sample is g = b / f, in mm / h. The side penetration rate is the side penetration distance divided by the test time. For example, Figure 6 The edge penetration rate of the oil-immersed sample is u = k / f, in mm / h.

[0068] It should be noted that in practical applications, the oil immersion sample may not have process holes. In this case, the edge penetration rate is the only criterion for testing the oil immersion sample. In practical applications, the oil immersion sample may also have other shapes, such as a cylinder. In this case, the cross-section of the oil immersion sample is circular. The edge penetration distance of the oil immersion sample is the maximum distance between the oil stain in the radial direction of the oil immersion sample and the corresponding edge, resulting from the oil penetrating from the edge of the oil immersion sample toward the center.

[0069] In actual application, the user can set multiple groups of extraction time f according to their own test needs, that is, every time a set extraction time f is reached, the immersion oil sample is taken out once and the immersion oil rate is measured. Then the immersion oil sample is placed in the first chamber 11, the second valve 6 is opened, and the oil is continuously injected until the immersion oil rate of all extraction times f is obtained. For example, see Figure 7 As shown, the hole penetration (distance), edge penetration (distance) and (penetration) rate are obtained for extraction times f of 4h, 8h, 12h and 16h. It should be noted that the (penetration) rate in this example is the hole penetration rate.

[0070] In an embodiment of the present invention, the test tool includes: a first shell 1, having a first chamber 11, and one end of the first shell 1 has a first opening 10 connected to the first chamber 11; the side wall of the first shell 1 has at least two first interfaces 12, each of which is connected to the first chamber 11 and extends outward relative to the first chamber 11; the side wall of the first shell 1 has a second interface 13, and the second interface 13 is connected to the first chamber 11; the second shell 2 has at least two, and is connected to the first interface 12 one by one; the second shell 2 also has a second chamber 21, and the second chamber 21 is connected to the first chamber 11 through the first interface 12; one end of the second shell 2 has a second opening connected to the second chamber 21 22; a first cover body 3 is detachably provided on the first opening 10; a second cover body 4 is detachably provided on the second opening 22; a first valve 5 is correspondingly provided on the first interface 12, for controlling the connection or disconnection between the first interface 12 and the first chamber 11; a second valve 6 is correspondingly provided on the second interface 13, for controlling the connection or disconnection between the second interface 13 and the first chamber 11. The test fixture according to the embodiment of the present invention can obtain test samples corresponding to different vacuuming stages and test samples corresponding to different oil filling stages, so that the user can obtain regularity conclusions through subsequent micro-water content and oil immersion rate measurements, laying a solid foundation for improving the transformer vacuum oil filling process based on regularity conclusions.

[0071] In some embodiments of the present invention, optionally,

[0072] See also Figure 1 As shown, the first housing 1 is cylindrical; the first interface 12 extends along the radial direction of the first housing 1, and the angle value of the first angle a between any two adjacent first interfaces 12 is equal;

[0073] The first angle a is the angle formed by the extension directions of two adjacent first interfaces 12 relative to the axis of the first housing 1 .

[0074] See also Figure 1 and Figure 2 As shown, the first shell 1 is cylindrical, and the first interface 12 extends along the radial direction of the first shell 1. The angle value of the first angle a between any two adjacent first interfaces 12 is equal, which is conducive to ensuring that the vacuum suction force applied to each second chamber 21 during the vacuum process is synchronous and uniform, ensuring that the micro-water samples in each second chamber 21 are under the same test conditions, and ensuring the high accuracy of the test results.

[0075] In some embodiments of the present invention, optionally,

[0076] See also Figure 3 As shown, any two second interfaces 13 are not spaced apart in the axial direction of the first housing 1;

[0077] The second interface 13 is spaced apart from the first interface 12 in the axial direction of the first housing 1 .

[0078] See also Figure 3 As shown, any two second interfaces 13 are not spaced apart in the axial direction of the first shell 1, that is, each second interface 13 has an equal height value relative to the bottom of the first shell 1; the second interface 13 is spaced apart from the first interface 12 in the axial direction of the first shell 1, that is, the height value of the second interface 13 relative to the bottom of the first shell 1 is not equal to the height value of the first interface 12 relative to the bottom of the first shell 1.

[0079] In actual applications, if the second interface 13 and the first interface 12 have the same height relative to the bottom of the first shell 1, the first interface 12 closer to the second interface 13 will be subjected to the vacuum suction force first, and will be subjected to a greater vacuum suction force than the other first interfaces 12. As a result, the test environment of the trace water samples in each second chamber 21 will be different, which will interfere with the test results of the trace water content of the trace water samples. In the embodiment of the present invention, any two second interfaces 13 are not spaced apart in the axial direction of the first shell 1, and the second interface 13 is spaced apart from the first interface 12 in the axial direction of the first shell 1, which is conducive to ensuring that the vacuum suction force received by each first interface 12 is uniform and synchronous, and ensuring that the test results have high accuracy.

[0080] In some embodiments of the present invention, optionally,

[0081] See also Figure 1 and Figure 2 As shown, the first interface 12 is in a circular tube shape, and the length direction of the first interface 12 coincides with the radial direction of the first shell 1 .

[0082] In practical applications, the first interface 12 is tubular, which helps reduce the manufacturing cost of the test fixture of the embodiment of the present invention. Specifically, the tubular shape of the first interface 12 allows the assembly requirements of the first interface 12 and the first housing 1 to be satisfied by simply drilling a hole in the first housing 1 during the manufacturing process, avoiding the need for further shaping of the drilled hole and eliminating cumbersome steps.

[0083] Furthermore, in actual applications, welding is used to securely connect the first interface 12 to the first housing 1. The outer contour of the connection between the tubular first interface 12 and the first housing 1 is smoother than the outer contour of the connection between the first interface 12 of other shapes and the first housing 1. This smooth outer contour, also known as the welding trajectory, avoids sharp corners in the welding trajectory, thus preventing stress concentration in the weld at corners, improving welding quality, and thereby increasing the service life of the test fixture of the present invention and reducing maintenance costs.

[0084] In particular, as an extension of the aforementioned technical solution (i.e., the first shell 1 is cylindrical; the first interface 12 extends along the radial direction of the first shell 1, and the angle value of the first angle a between any two adjacent first interfaces 12 is equal; wherein, the first angle a is the angle formed by the extension direction of the two adjacent first interfaces 12 relative to the axis of the first shell 1), the first shell 1 is cylindrical, and the first interface 12 is tubular. When arranged uniformly at equal angles (the angle value of the first angle a between any two adjacent first interfaces 12 is equal), the outer contour lines of the joints between each first interface 12 and the first shell 1 are the same and are all smooth outer contour lines. The uniform arrangement at equal angles and the same outer contour lines are conducive to ensuring that the stress generated at each welding joint is the same, avoiding the problem of deformation of the first shell 1 due to uneven welding stress, thereby improving the service life of the test tooling of the embodiment of the present invention and reducing maintenance costs; in addition, the smooth outer contour line can avoid stress concentration in the welds at the corners, improve the welding quality, and thereby improve the service life of the test tooling of the embodiment of the present invention and reduce maintenance costs.

[0085] In some embodiments of the present invention, optionally,

[0086] The second shell 2 is cylindrical, the first interface 12 is tubular, and one end of the second shell 2 without the second opening 22 is connected to the first interface 12 via a flange, and the interface of the flange is sealed.

[0087] The flange connection is adopted and the flange interface is sealed to avoid gaps in the interface, which is conducive to ensuring that the air pressure in each second chamber 21 is the same during the vacuum operation, ensuring that each trace water sample is under the same test conditions, and ensuring high accuracy of the test results.

[0088] In some embodiments of the present invention, optionally, the first interface 12 is in a circular tube shape, the second interface 13 is in a circular tube shape, and the diameter of the second interface 13 is larger than the diameter of the first interface 12 .

[0089] The first interface 12 serves as a branch interface (branch, compared to the second interface 13) connecting the second shell 2. During the vacuum operation, the gas of each first interface 12 is aggregated and then extracted through the second interface 13. The diameter of the second interface 13 is larger than the diameter of the first interface 12, so that the second interface 13 can carry the aggregated gas volume, that is, ensure that the gas flow rate in the second interface 13 is within the safety limit, prevent the gas flow rate from being too high, causing the pressure difference between the internal air pressure of the second interface 13 and the external atmospheric pressure to be too large, and avoid the hidden danger of the external atmospheric pressure compressing and deforming the second interface 13; on the other hand, since the diameter of the second interface 13 is larger than the diameter of the first interface 12, the hidden danger of deformation of the second interface 13 is avoided, and the material specifications of the second interface 13 can be reduced (for example, using a thinner tube wall), which is beneficial to reducing the manufacturing cost of the test tooling of the embodiment of the present invention.

[0090] In some embodiments of the present invention, optionally,

[0091] An exhaust valve 7 is provided on the first cover 3 .

[0092] In practice, the transformer oil filling port, connected to second interface 13, is located at the bottom of the transformer's outer shell. During the oil filling process, gas contained in the oil tends to accumulate within first chamber 11, generating pressure that prevents the oil-immersed sample from being fully submerged in the oil, thus interfering with test results. In this embodiment of the present invention, an exhaust valve 7 is provided on first cover 3 to effectively remove gas from first chamber 11, ensuring that the oil-immersed sample remains fully submerged in the oil during testing and improving the accuracy of test results.

[0093] In some embodiments of the present invention, optionally, the test tool further includes:

[0094] The micro-water measuring instrument comprises: a micro-water measuring instrument body and a micro-water measuring probe;

[0095] The trace water measurement probe is electrically connected to the trace water measurement instrument body, and the trace water measurement probe is located in the second chamber 21 .

[0096] Based on the setting of the micro-water measuring instrument, the embodiment of the present invention can also measure the micro-water content of micro-water sample without taking out the micro-water sample, and obtain the in-situ measurement data of micro-water content.The present embodiment can avoid the influence of the opening process of the second cover 4 on the micro-water sample, and guarantees the high accuracy of the test result.In addition, the mode of taking out the micro-water sample and carrying out the micro-water measurement can only obtain the micro-water measurement data corresponding to the moment of taking out the micro-water sample.And adopting the micro-water measuring instrument to measure the real-time micro-water measurement data of the micro-water sample between the vacuum starting moment and the micro-water test ending moment, guarantees the high accuracy and the high integrity of the test data, and provides more comprehensive data support for subsequent transformer production, improves production efficiency.

[0097] It can be understood that in this embodiment, since the trace water content data of the trace water sample can be measured in situ, different types of trace water samples can be placed in each second chamber 21, thereby achieving the purpose of obtaining trace water measurement data of multiple types of trace water samples in one test, thereby improving test efficiency.

[0098] In some embodiments, the micro-water meter itself includes a timing unit. This means that when real-time micro-water measurement data is obtained, the real-time micro-water measurement data can be mapped to time, allowing a micro-water measurement data-time curve to be directly generated through the micro-water meter itself. This embodiment facilitates intuitive understanding of the changing patterns of micro-water measurement data, improving the user experience. It also facilitates subsequent improvements to transformer production processes based on micro-water measurement data, thereby increasing production efficiency.

[0099] It is understood that the electrical connection between the micro-water measurement probe and the micro-water measurement instrument body can be a thin data cable. When the second cover 4 is positioned over the second opening 22, the data cable extends from the gap between the second cover 4 and the second opening 22. Due to the thinness of the data cable, the gap between the second cover 4 and the second opening 22 can be sealed. Alternatively, additional sealing material can be added to the gap between the second cover 4 and the second opening 22 caused by the data cable to ensure the sealing of the gap between the second cover 4 and the second opening 22.

[0100] In some embodiments, the electrical connection between the micro-water measurement probe and the micro-water measurement instrument body can be a wireless communication method, which avoids the problem of reduced sealing caused by wiring, and achieves a better technical effect of ensuring the sealing of the gap between the second cover body 4 and the second opening 22; In addition, the wireless communication method can further expand the distance between the micro-water measurement instrument body and the micro-water measurement probe. For example, the micro-water measurement instrument body can be located in the central control room, and the user can obtain the micro-water measurement data in the central control room without the user being personally on site, which can effectively ensure user safety and high user experience. For example, the wireless communication module of the micro-water measurement probe can be used to send and receive communication signals of the communication operator, so the micro-water measurement instrument body can be deployed in B, and the user is also located in B, which is far away from A where the test site is located. Through the operator's 3G, 4G or 5G communication network, micro-water measurement data transmission across factories, cities, provinces and even countries can be achieved between A and B, greatly improving the deployment flexibility of the test tooling of the embodiment of the present invention. Without the need for the user to be personally on site, it can effectively ensure user safety and high user experience.

[0101] In some embodiments of the present invention, optionally, the test tool further includes:

[0102] The oil immersion measuring instrument comprises: an oil immersion measuring instrument body and an oil immersion measuring probe;

[0103] The oil immersion measuring probe is electrically connected to the oil immersion measuring instrument body and is located in the first chamber 11 .

[0104] Based on the setting of the immersion oil measuring instrument, the embodiment of the present invention can also measure the immersion rate of the immersion oil sample without taking out the immersion oil sample. Figure 6 The measurement of each spacing value shown is to measure the in-situ measurement data of the oil-immersed sample. This embodiment can avoid the influence of the opening process of the first cover 3 on the oil-immersed sample, and ensure the high accuracy of the test results.

[0105] In addition, in order to obtain the variation law of oil immersion rate by taking out the oil immersion sample and testing the oil immersion rate, see Figure 7As shown, it is necessary to set multiple removal times f, take out the oil-immersed sample every removal time f to measure the oil immersion rate, and then put the oil-immersed sample back after the measurement, which is a cumbersome operation. Moreover, it is understandable that even if more removal times f are set (that is, more oil immersion rate data values are obtained during the entire test), the oil immersion rate values obtained are isolated endpoint values (not continuous values, and the data are incomplete), and a complete oil immersion rate change curve cannot be formed. This brings difficulties to subsequent users in improving the vacuum oil filling process according to the law of oil immersion rate changes. The use of an oil immersion meter can measure the real-time oil immersion rate of the oil-immersed sample from the start of oil filling to the end of the test, ensuring the high accuracy and integrity of the test data, providing more comprehensive data support for subsequent transformer production, and improving production efficiency.

[0106] It is understood that the electrical connection between the immersion oil measurement probe and the immersion oil measurement instrument body can be a thin data cable. When the first cover 3 is placed on the first opening 10, the data cable extends from the gap between the first cover 3 and the first opening 10. Due to the thinness of the data cable, the gap between the first cover 3 and the first opening 10 can also be sealed. Alternatively, additional sealing material can be added to the gap between the first cover 3 and the first opening 10 caused by the data cable to ensure the sealing of the gap between the first cover 3 and the first opening 10.

[0107] In some embodiments, the electrical connection between the oil immersion measurement probe and the oil immersion measurement instrument body can be wireless communication, avoiding the problem of reduced sealing caused by wiring and achieving the technical effect of better ensuring the sealing of the gap between the first cover 3 and the first opening 10. Furthermore, wireless communication can further increase the distance between the oil immersion measurement instrument body and the oil immersion measurement probe. For example, the oil immersion measurement instrument body can be located in a central control room, where users can obtain oil immersion rate data without having to be physically present on-site, effectively ensuring user safety and a high user experience. For example, if the wireless communication module of the oil immersion measurement probe can be used to transmit and receive communication signals from a telecommunications operator, the oil immersion measurement instrument body can be deployed at location B, where the user is also located, and is far away from location A, where the test site is located. Using the operator's 3G, 4G, or 5G communication network, oil immersion rate data can be transmitted between locations A and B across factories, cities, provinces, and even countries, greatly improving the deployment flexibility of the test tooling of the present invention. This eliminates the need for users to be physically present on-site, effectively ensuring user safety and a high user experience.

[0108] In some embodiments of the present invention, optionally, the oil immersion measuring instrument includes at least one of the following types of measuring instruments:

[0109] Vision measuring instrument, laser measuring instrument.

[0110] See also Figure 6The oil immersion rate test method shown here can obtain oil immersion rate data by measuring various spacing values using either a visual measuring instrument or a laser measuring instrument. Specifically, the oil immersion measurement probe corresponding to the visual measuring instrument can be a video probe, while the oil immersion measurement probe corresponding to the laser measuring instrument can be a laser probe. In technical solutions that include both a visual measuring instrument and a laser measuring instrument, the spacing values obtained by the two devices can be cross-checked and corrected, ensuring high accuracy of the measured oil immersion rate data.

[0111] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A test fixture for transformer insulation parts, characterized in that: include: A first shell having a first chamber, wherein one end of the first shell has a first opening communicating with the first chamber; The side wall of the first shell has at least two first interfaces, each of which is in communication with the first chamber and extends outward relative to the first chamber; the side wall of the first shell has a second interface, which is in communication with the first chamber; The second housing has at least two parts, and the parts are connected to the first interface in a one-to-one correspondence; the second housing further has a second chamber, the second chamber is connected to the first chamber via the first interface; one end of the second housing has a second opening connected to the second chamber; a first cover body, detachably disposed on the first opening; a second cover detachably disposed on the second opening; a first valve, correspondingly provided on the first interface, for controlling the connection or disconnection between the first interface and the first chamber; a second valve, correspondingly provided on the second interface, for controlling the connection or disconnection between the second interface and the first chamber; Any two of the second interfaces are not spaced apart in the axial direction of the first housing; The second interface is spaced apart from the first interface in the axial direction of the first housing; During the test, the insulating component samples for oil immersion test are placed in the first chamber, and the insulating component samples for trace water test are placed in the second chamber in a one-to-one correspondence.

2. The test fixture according to claim 1, characterized in that: The first shell is cylindrical; the first interface extends along the radial direction of the first shell, and the first angle between any two adjacent first interfaces is equal; The first angle is an angle formed by the extension directions of two adjacent first interfaces relative to the axis of the first shell.

3. The test fixture according to claim 2, characterized in that: The first interface is in a circular tube shape, and the length direction of the first interface coincides with the radial direction of the first shell.

4. The test fixture according to claim 1, characterized in that: The second shell is cylindrical, the first interface is tubular, and one end of the second shell that does not have the second opening is connected to the first interface via a flange, and the interface of the flange is sealed.

5. The test fixture according to claim 1, characterized in that: The first interface is in the shape of a circular tube, the second interface is in the shape of a circular tube, and the diameter of the second interface is larger than the diameter of the first interface.

6. The test fixture according to claim 1, characterized in that: The first cover body is provided with an exhaust valve.

7. The test fixture according to claim 1, characterized in that: Also includes: The micro-water measuring instrument comprises: a micro-water measuring instrument body and a micro-water measuring probe; The micro-water measuring probe is electrically connected to the micro-water measuring instrument body, and the micro-water measuring probe is located in the second chamber.

8. The test fixture according to claim 1, characterized in that: Also includes: The oil immersion measuring instrument comprises: an oil immersion measuring instrument body and an oil immersion measuring probe; The oil immersion measuring probe is electrically connected to the oil immersion measuring instrument body, and the oil immersion measuring probe is located in the first chamber.

9. The test fixture according to claim 8, characterized in that: The oil immersion measuring instrument includes at least one of the following types of measuring instruments: Vision measuring instruments, laser measuring instruments.

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