Overall leakage testing tool for capsule oil conservator transformer

Abstract

The utility model discloses a capsule oil conservator transformer integral leakage test tool which is used for being connected with a breathing port of a capsule oil conservator and comprises a pressure gauge, a pressure gauge seat, an air pipe and an air cylinder. The pressure gauge seat is used for being detachably connected with the breathing opening, the pressure gauge seat is provided with a first gas path communicated with the breathing opening, the pressure gauge is installed on the pressure gauge seat, and a sensitive element of the pressure gauge is located in the first gas path; and the gas pipe is used for communicating the first gas path of the pressure gauge seat with the gas cylinder. The leakage testing tool can avoid the problem that the insulation level of transformer oil is reduced due to the fact that the gas content in the oil is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, and specifically to an integral leak detection tooling for a capsule oil conservator transformer. Background Technique

[0002] Transformer oil leakage is a relatively common fault of power transformers. Once a transformer leaks oil, it not only affects the appearance and pollutes the environment, but also reduces the oil level, posing a threat to the safe operation of the transformer, and the consequences are very serious. Therefore, the transformer sealing test is a mandatory inspection item for transformer factory tests, and the tightness of the transformer is inspected by applying a certain pressure inside the transformer.

[0003] Generally, there are two inspection methods: air pressure and oil pressure. When using the oil pressure method, a static pressure tank needs to be placed at a high place, and the static pressure tank is connected to the transformer by a pipeline. The internal pressure of the transformer is reached by adjusting the oil level height of the static pressure tank. This method is complicated to operate. When using the air pressure method, it is necessary to consider avoiding the problem that the gas content in the oil increases after the gas contacts the oil of the transformer, resulting in a decrease in the insulation level of the transformer oil. Content of the Utility Model

[0004] In order to overcome the defects in the prior art, the embodiment of the utility model provides an integral leak detection tooling for a capsule oil conservator transformer, which can avoid the problem that the gas content in the oil increases, resulting in a decrease in the insulation level of the transformer oil. This tooling does not require a static pressure tank, has a simple usage method, is applicable to individual leak detection of products with different capacities, and is also suitable for use during on-site installation and acceptance of main transformers.

[0005] The embodiment of the present application discloses: an integral leak detection tooling for a capsule oil conservator transformer, which is used to connect with the breathing port of the capsule oil conservator, and includes: a pressure gauge, a pressure gauge seat, an air pipe and a gas cylinder; the pressure gauge seat is used to be detachably connected to the breathing port, the pressure gauge seat is provided with a first gas path communicating with the breathing port, the pressure gauge is installed on the pressure gauge seat and the sensitive element of the pressure gauge is located in the first gas path; the air pipe is used to connect the first gas path of the pressure gauge seat and the gas cylinder.

[0006] Specifically, the tooling further includes a ball valve and a ball valve seat, the ball valve seat is arranged on the pressure gauge seat and is provided with a second gas path for communicating with the first gas path, and the ball valve is installed on the ball valve seat and is used to connect the second gas path and the air pipe.

[0007] Specifically, the tooling further includes a first flange connected to the pressure gauge seat, and the pressure gauge seat is connected to a second flange on the breathing port through the first flange.

[0008] Specifically, the ball valve seat and the first flange are respectively welded to the pressure gauge seat.

[0009] Specifically, a first sealing ring is provided between the pressure gauge and the pressure gauge seat.

[0010] Specifically, a second sealing ring is provided between the first flange and the second flange.

[0011] Specifically, the gas cylinder is filled with dry air or nitrogen.

[0012] The utility model has at least the following beneficial effects: The leak detection tooling in this embodiment fills gas into the capsule to make the inside of the capsule have a certain air pressure. The pressure in the capsule acts entirely on the transformer oil surface so that the oil in the conservator is under a preset pressure, and the airtightness detection of the transformer can be realized. Since the gas is located inside the capsule and does not contact the oil surface, the problem of the decrease in the insulation level of the transformer oil caused by the increase in the gas content in the oil can be avoided; compared with the hydraulic pressure leak detection tooling, this tooling does not require a static pressure tank, has a simple usage method, is applicable to the individual leak detection of products with different capacities, and is also suitable for use during the on-site installation and acceptance of the main transformer.

[0013] To make the above and other purposes, features and advantages of the utility model more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0015] Figure 1 is a schematic structural diagram of the connection between the leak detection tooling and the transformer capsule conservator in the embodiment of the present utility model;

[0016] Figure 2 is a schematic structural diagram of the leak detection tooling in the embodiment of the present utility model;

[0017] Figure 3 is a schematic diagram of the force on the transformer oil in the capsule conservator in the embodiment of the present utility model.

[0018] The reference numerals of the above accompanying drawings: 1, pressure gauge; 2, pressure gauge seat; 3, air pipe; 4, gas cylinder; 5, ball valve; 6, ball valve seat; 71, first flange; 72, second flange; 81, first sealing ring; 82, second sealing ring; 10, capsule conservator; 110, capsule; 120, breathing port; 130, exhaust port. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part rather than all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", "fixed", 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 mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0021] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "below", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "under" the second feature includes the first feature being below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0022] In the description of this embodiment, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the protection scope of this application.

[0023] In addition, the terms "first", "second", etc. are only used for distinction in description and do not have special meanings.

[0024] As Figure 1 shown, the overall leak detection tooling for the capsule conservator transformer in this embodiment can be used to connect to the breathing port 120 of the capsule conservator 10 to perform a sealing test on the overall capsule conservator 10 transformer.

[0025] Combined Figure 1 with Figure 2 As shown, the overall leak detection tooling for the capsule conservator transformer in this embodiment mainly includes: a pressure gauge 1, a pressure gauge seat 2, an air pipe 3, and a gas cylinder 4. Among them, the pressure gauge seat 2 is used to detachably connect to the breathing port 120 of the capsule conservator 10, mainly playing the role of fixing and supporting the tooling on the capsule conservator 10. The pressure gauge seat 2 is provided with a first air path for communicating with the breathing port 120. Specifically, the pressure gauge seat 2 can be a metal pipe. The pressure gauge 1 is installed on the pressure gauge seat 2, and the sensitive element of the pressure gauge 1 is located in the first air path. When the air pressure in the first air path fluctuates, the elastic deformation amount of the sensitive element of the pressure gauge 1 changes, thereby driving the pointer of the pressure gauge 1 to change. One end of the air pipe 3 is communicated with the first air path of the pressure gauge seat 2, and the other end is communicated with the gas cylinder 4, so that the dry air or nitrogen in the gas cylinder 4 can flow into the capsule 110.

[0026] By means of the above mechanism, the leak detection tooling in this embodiment fills the capsule 110 with gas so that the inside of the capsule 110 has a certain air pressure. The pressure inside the capsule 110 acts entirely on the transformer oil surface so that the oil in the conservator is under a preset pressure (such as Figure 3 shown), and the sealing performance detection of the transformer can be realized. Since the gas is located inside the capsule 110 and does not contact the oil surface, it is possible to avoid the problem that the gas content in the oil increases, resulting in a decrease in the insulation level of the transformer oil; compared with the oil pressure leak detection tooling, this tooling does not require a static pressure tank, is suitable for individual leak detection of products with different capacities, and is also suitable for use during the on-site installation and acceptance of the main transformer.

[0027] Preferably, as Figure 2 shown, the leak detection tooling in this embodiment further includes a ball valve 5 and a ball valve seat 6. Among them, the ball valve seat 6 is arranged on the pressure gauge seat 2, and the ball valve seat 6 is provided with a second air path for communicating with the first air path on the pressure gauge seat 2. The ball valve 5 is installed on the ball valve seat 6 for communicating the second air path and the air pipe 3. The amount of gas flowing into the capsule 110 can be controlled by opening and closing the ball valve 5.

[0028] As Figure 2 shown, the leak detection tooling in this embodiment further includes a first flange 71 and a hexagon head bolt connected to the pressure gauge seat 2. The pressure gauge seat 2 is connected to the second flange 72 on the breathing port 120 through the first flange 71 and fastened with the hexagon head bolt.

[0029] Preferably, the ball valve seat 6 and the first flange 71 in this embodiment are respectively welded to the pressure gauge seat 2. That is to say, the pressure gauge seat 2, the ball valve seat 6, and the first flange 71 in this embodiment are welded into one body, which is beneficial to improving the connection simplicity of these three components.

[0030] As Figure 2As shown in the figure, the leak detection tooling of this embodiment may further include a first sealing ring 81 and a second sealing ring 82. Among them, the first sealing ring 81 is arranged between the pressure gauge 1 and the pressure gauge seat 2, and the second sealing ring 82 is arranged between the first flange 71 and the second flange 72, which is beneficial to improving the sealing performance of the leak detection tooling and the test accuracy.

[0031] In summary, the usage method of the overall leak detection tooling for the capsule oil conservator transformer in this embodiment is as follows: Connect the first flange 71 of the pressure gauge seat 2 to the second flange 72 of the breather port 120 of the oil conservator, connect the gas cylinder 4 to the ball valve 5 with the air pipe 3, and open the exhaust valve on the exhaust port 130 of the oil conservator; Slowly inject nitrogen or dry air in the gas cylinder 4 into the capsule 110 of the oil conservator. At this time, gas continuously overflows from the exhaust valve of the exhaust port 130 until the gas on the oil surface inside the oil conservator (outside the capsule 110) is exhausted. When oil overflows from the exhaust valve of the exhaust port 130, close the exhaust valve; Continue to inflate until the reading of the pressure gauge 1 reaches the preset pressure value (such as 0.05 MPa), then close the ball valve 5 on the tooling and stop inflating; After maintaining the pressure inside the capsule 110 for a preset time (such as 24 h), check for oil leakage at each weld and each gasket of the transformer; After the leak detection is completed, open the ball valve 5 on the tooling to release the gas pressure inside the capsule 110, and remove the tooling from the breather port 120, and the leak detection ends.

[0032] In the present utility model, specific embodiments are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; At the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A capsule oil storage tank transformer integral leakage test tool, used to connect with the breathing port of the capsule oil storage tank, characterized in that: include: A pressure gauge, a pressure gauge seat, an air pipe and a gas cylinder; the pressure gauge seat is used to be detachably connected to the breathing port, the pressure gauge seat is provided with a first air path connected to the breathing port, the pressure gauge is installed on the pressure gauge seat and the sensitive element of the pressure gauge is located in the first air path; the air pipe is used to connect the first air path of the pressure gauge seat and the gas cylinder.

2. The capsule oil storage cabinet transformer integral leakage test tool according to claim 1 is characterized in that: The tooling also includes a ball valve and a ball valve seat, wherein the ball valve seat is disposed on the pressure gauge seat and is provided with a second gas path for communicating with the first gas path, and the ball valve is installed on the ball valve seat and is used to connect the second gas path and the air pipe.

3. The capsule oil storage cabinet transformer integral leakage test tool according to claim 2 is characterized in that: The tooling also includes a first flange connected to the pressure gauge seat, and the pressure gauge seat is connected to a second flange on the breathing port through the first flange.

4. The capsule oil storage cabinet transformer integral leakage test tool according to claim 3 is characterized in that: The ball valve seat and the first flange are welded to the pressure gauge seat respectively.

5. The capsule oil storage cabinet transformer integral leakage test tool according to claim 1 is characterized in that: A first sealing ring is provided between the pressure gauge and the pressure gauge seat.

6. The capsule oil storage cabinet transformer integral leakage test tool according to claim 3 is characterized in that: A second sealing ring is provided between the first flange and the second flange.

7. The capsule oil storage cabinet transformer integral leakage test tool according to claim 1 is characterized in that: The gas cylinder is filled with dry air or nitrogen.

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